ANTELOPE VALLEY AIR QUALITY MANAGEMENT DISTRICT

RULE 463

Organic Liquid Storage

(Adopted 08/15/77; Amended: 06/01/84; Amended 12/07/90; Amended 03/11/94)

(a) Applicability

This rule applies to any above-ground stationary tank with a capacity of 75,000 liters (19,815 gallons) or greater used for storage of organic liquids, and any above-ground tank with a capacity between 950 liters (251 gallons) and 75,000 liters (19,815 gallons) used for storage of gasoline.

 (b) Definitions

For purposes of this rule, the following definitions apply:

  1. (1)Certified person is a person who has successfully completed the District tank self-inspection program, and who holds a certificate issued by the Executive Officer evidencing that such person is in good standing in this program.

  2. EXEMPT COMPOUND is any of the following compounds which have been determined to be non-precursors of ozone:
    1. Group I

      chlorodifluoromethane (HCFC-22)

      trifluoromethane (HFC-23)

      dichlorotrifluoroethane (HCFC-123)

      2-chloro-1,1,2,2-tetrafluoroethane (HCFC-124)

      pentafluoroethane (HFC-125)

      1,1,2,2-tetrafluoroethane (HFC-134)

      tetrafluoroethane (HFC-134a)

      dichlorofluoroethane (HCFC-141b)

      chlorodifluoroethane (HCFC-142b)

      1,1,1-trifluoroethane (HFC-143a)

      1,1-diflouroethane (HFC-152a)

      cyclic, branched, or linear, completely fluorinated alkanes

      cyclic, branched, or linear, completely fluorinated ethers with no unsaturations

      cyclic, branched, or linear, completely fluorinated tertiary amines with no unsaturations

      sulfur-containing perfluorocarbons with no unsaturations and with sulfur bonds only to carbon and fluorine

    2. Group II

      carbon tetrachloride

      methylene chloride

      1,1,1-trichloroethane (methyl chloroform)

      trichlorotrifluoroethane (CFC-113)

      dichlorodifluoromethane (CFC-12)

      trichlorofluoromethane (CFC-11)

      dichlorotetrafluoroethane (CFC-114)

      chloropentafluoroethane (CFC-115)

      Use of Group II compounds will be restricted in the future because they are either toxic or potentially toxic, or upper atmospheric ozone depleters, or cause other environmental impacts. Specifically, the District Board has established a policy to phase out chlorofluorocarbons (CFC), methyl chloroform (1,1,1-trichloroethane), and carbon tetrachloride on or before January 1, 1996.

  3. GASOLINE means any petroleum distillate having a Reid vapor pressure of 200 mm Hg (3.9 pounds per square inch), or greater.

  4. ORGANIC LIQUID is any liquid containing VOCs.

  5. PRESSURE RELIEF VALVE (PRV) is a valve which is automatically actuated by upstream static pressure, and used for safety or emergency purposes.

  6. SEAL is a closure device between the tank wall and the floating roof edge that controls emissions of volatile organic compounds. Approved floating roof tank seals are categorized as follows:
    1. Category "A" seals are seals approved by the Executive Officer as most effective in the control of volatile organic compounds and are deemed Best Available Control Technology (BACT) according to the criteria set forth in Attachment A - "Floating Roof Tank Seal Categories."
    2. Category "B" seals are seals approved by the Executive Officer that are considered more effective than Category "C" seals based on the criteria set forth in Attachment A - "Floating Roof Tank Seal Categories."
    3. Category "C" seals are seals approved by the Executive Officer which are currently in service but are considered least effective in the control of volatile organic compounds.

  7. TANK is any stationary above-ground reservoir or any other stationary above-ground container used for storage of an organic liquid.

  8. VAPOR TIGHT is a condition that exists when the reading on a portable hydrocarbon meter is less than 1,000 parts per million (ppm), expressed as methane, above background.

  9. VOLATILE ORGANIC COMPOUND (VOC) is any volatile or gaseous chemical compound containing the element carbon, excluding methane, carbon monoxide, carbon dioxide, carbonic acid, metallic carbides, or carbonates, ammonium carbonate, and exempt compounds other than carbon tetrachloride.

(c)Tank Roof Requirements

No person shall place, store or hold in any tank with a capacity of 150,000 liters (39,630 gallons) or greater, any organic liquid having a true vapor pressure of 25.8 mm Hg (0.5 psi) absolute or greater under actual storage conditions, and in any tank of more than 75,000 liters (19,815 gallons) capacity, any organic liquid having a true vapor pressure of 77.5 mm Hg (1.5 psi) absolute or greater under actual storage conditions, unless such tank is a pressure tank maintaining working pressures sufficient at all times to prevent organic vapor loss to the atmosphere, or is designed and equipped with one of the following vapor control devices, which is properly installed and continuously maintained in good operating condition:

  1. External Floating Roof

    An external floating roof shall consist of a pontoon-type or double deck-type cover that continuously rests on the surface of the organic liquid and is equipped with a closure device between the tank shell and roof edge. The closure device shall consist of two seals, with one seal placed above the other. The seal below shall be designated as the primary seal, and the seal above shall be designated as the secondary seal. A seal which is not identified on the current list of seals approved by the Executive Officer shall not be installed or used unless the Executive Officer determines that such seal meets the applicable criteria of subparagraphs (c)(1)(A) through (c)(1)(C).

    1. A closure device on a welded or a riveted tank shell which uses a metallic shoe-type seal as its primary seal shall comply with the following requirements:
      1. Gaps between the tank shell and the primary seal shall not exceed 1.3 centimeters (1/2 inch) for a cumulative length of 30 percent of the circumference of the tank, and 0.32 centimeter (1/8 inch) for 60 percent of the circumference of the tank. No gap between the tank shell and the primary seal shall exceed 3.8 centimeters (1-1/2 inches). No continuous gap between the tank shell and the primary seal greater than 0.32 centimeter (1/8 inch) shall exceed 10 percent of the circumference of the tank.

      2. Gaps between the tank shell and the secondary seal shall not exceed 0.32 centimeter (1/8 inch) for a cumulative length of 95 percent of the circumference of the tank. No gap between the tank shell and the secondary seal shall exceed 1.3 centimeters (1/2 inch).

      3. Metallic shoe-type seals installed on or after August 1, 1977 shall be installed so that one end of the shoe extends into the stored organic liquid and the other end extends a minimum vertical distance of 61 centimeters (24 inches) above the stored organic liquid surface.

      4. The geometry of the shoe shall be such that the maximum gap between the shoe and the tank shell is no greater than double the gap allowed by the seal gap criteria specified in clause (c)(1)(A)(i) for a length of at least 46 centimeters (18 inches) in the vertical plane above the liquid surface.

    2. A closure device which uses a resilient toroid-type seal as its primary seal shall comply with the applicable requirements of subparagraph (c)(1)(A).

    3. The primary and secondary seals shall comply with the following requirements:
      1. The primary seal envelope shall be made available for unobstructed inspection by the Executive Officer along its circumference. In the
      2. case of riveted tanks with resilient toroid-type seals, at least eight such locations shall be made available; for all other types of seals, at least four such locations shall be made available. If the Executive Officer deems it necessary, further unobstructed inspection of the primary seal may be required to determine the seal's condition along its entire circumference.
      3. The secondary seal shall be installed in a way that permits the Executive Officer to insert probes up to 3.8 centimeters (1-1/2 inches) in width to measure gaps in the primary seal.
      4. The secondary seal shall extend from the roof to the tank shell and shall not be attached to the primary seal.
      5. Notwithstanding the secondary and the primary seal requirements of paragraph (c)(1), a secondary or primary seal may be loosened or removed for preventive maintenance, inspection or repair for a period not exceeding 72 hours with prior notification to the Executive Officer .

    4. All openings in the roof except pressure-vacuum valves, shall provide a projection below the liquid surface to prevent belching, escape, or entrainment of organic liquid, and shall be equipped with a cover, seal or lid. The cover, seal, or lid shall at all times be in a closed position, with no visible gaps, except when the device or appurtenance is in use. Pressure vacuum valves shall be set to within 10 percent of the maximum allowable working pressure of the roof.

    5. There shall be no holes, tears or openings in the secondary seal or in the primary seal envelope surrounding the annular vapor space enclosed by the roof edge, seal fabric, and secondary seal.

    6. Any emergency roof drain shall be provided with a slotted membrane fabric cover, or equivalent device, that covers at least nine-tenths (9/10) of the area of the opening.

  2. Internal Floating-Type Cover

    A fixed roof tank equipped with an internal floating-type cover shall comply with the following requirements:

    1. A fixed roof tank with an existing internal floating-type cover approved by the Executive Officer on or before June 1, 1984, shall comply with the requirements applicable at the time such approval was given.

    2. A fixed roof tank which has an internal floating-type cover installed, modified, or replaced after June 1, 1984, shall have a closure device which consists of either a single liquid mounted primary seal or a primary and a secondary seal. All openings and fittings shall be fully gasketed or controlled in a manner specified by the Executive Officer. The closure device shall control vapor loss with an effectiveness equivalent to a closure device which meets the requirements of subparagraph (c)(1)(A). Seal designs not identified on the current list of seals approved by the Executive Officer shall not be installed or used unless the Executive Officer has given his prior written approval to its installation or use. For purposes of this paragraph, modification includes an identical replacement.

    3. The concentration of organic vapor in the vapor space above the internal floating-type cover shall not exceed 50 percent of its lower explosive limit (LEL) for those installed prior to June 1, 1984 and 30 percent of its LEL for those installed after June 1, 1984. Compliance shall be verified by the use of an explosimeter.

  3. Vapor Recovery System

    A fixed roof tank equipped with a vapor recovery system shall comply with the following requirements:

    1. Any tank gauging or sampling device on a tank vented to the vapor recovery system shall be equipped with a vapor-tight cover which shall be closed at all times except during gauging or sampling. The roof of such tank shall be properly maintained to be vapor tight with no holes, tears or uncovered openings.

    2. All piping, valves and fittings shall be constructed and maintained in a vapor-tight condition, in accordance with requirements of other District rules for such equipment.

    3. For purposes of this paragraph, the efficiency of a vapor recovery system shall be determined by making a comparison of controlled emissions to those emissions which would occur from a fixed cone roof tank holding the same organic liquid without a vapor control or vapor recovery system. The vapor recovery system shall have an efficiency of at least 95 percent by weight.

 (d) Other Performance Requirements

  1. A person shall not place, store or hold gasoline in any tank, with a capacity of between 950 liters (251 gallons) and 75,000 liters (19,815 gallons) unless such tank is equipped with a pressure-vacuum valve which is set to within 10 percent of the maximum allowable working pressure of the container, or is equipped with a vapor loss control device which complies with the requirements set forth in subdivision (c).

  2. The roof of any internal or external floating roof tank shall float on the organic liquid at all times (i.e., free of the roof leg supports) except when the tank is being completely emptied for cleaning, or repair. The process of emptying or refilling, when the roof is resting on leg supports, shall be continuous.

  3. If a tank has been gas-freed and is to be refilled with gasoline, the roof shall be refloated with water or by an equivalent procedure approved by the Executive Officer. Paragraphs (d)(2) and (d)(3) shall be inapplicable to gasoline storage tanks at bulk gasoline distribution terminals which do not have:
    1. existing facilities for treatment of waste water used to refloat the tank roof; or
    2. facilities for equivalent emission control when refloating the roof with organic liquid.
  4. No crude oil containing in excess of 70 ppm by weight of hydrogen sulfide shall be stored in a floating roof tank.

  5. A fixed roof tank with an internal floating-type cover or a tank with an external floating roof cover shall not be used for storing organic liquids having a true vapor pressure of 11 psia (569 mm Hg) or greater under actual storage conditions.

  6. Replacement of a seal on a floating roof tank shall be allowed only if the replacement seal is chosen from the current list of seals approved by the Executive Officer. Category "A" seals shall be replaced only by Category "A" seals. Category "B" seals shall be replaced only by Category "A" or Category "B" seals. Category "C" seals shall be replaced only by Category "A" or Category "B" seals.

(e) Self-Inspection of Floating Roof Tanks

Any owner or operator of a floating roof tank(s) shall conduct self-inspections of its tank(s) according to the following procedures:

  1. Inspection and Maintenance Plan

    1. On or before September 14, 1994, each owner or operator shall submit an Inspection and Maintenance Plan to the Executive Officer for his/her approval. After September 14, 1994, each owner or operator constructing tank(s) subject to this rule shall submit an Inspection and Maintenance Plan, or a revision of its current Inspection and Maintenance Plan, to the Executive Officer prior to the completion of construction. The Inspection and Maintenance Plan shall include an inventory of tanks subject to this rule, the proposed self-inspection schedule, the number of certified persons to be dedicated to the program, any self-inspection procedures proposed in addition to those required by the District, and a copy of the owner or operator's safety procedures used for floating roof tanks. The tank inventory shall include tank identification number, maximum design capacity, product, shell type, dimensions, seal type and manufacturer, floating roof type, date of construction and location.

  2. Identification Requirements

    1. All tanks subject to this rule shall be clearly and visibly identified by a sign on the outside wall for inventory, inspection and recordkeeping purposes.

    2. Any change(s) in tank identification shall require prior written approval by the Executive Officer.

  3. Owner or Operator Inspection Requirements
    1. All tanks subject to this rule shall be inspected by a certified person twice per year at 4 to 8 months intervals according to the procedures and guidelines set forth in Attachment B - "Inspection Procedures and Compliance Report Form."
    2. The primary and secondary seals shall be inspected by a certified person each time a tank is emptied and degassed. Gap measurements shall be performed on an external floating roof tank when the liquid surface is still but not more than 24 hours after the tank roof is refloated.
    3. The Executive Officer shall be notified in writing at least 2 weeks prior to the start of any tank-emptying or roof-refloating operation for planned maintenance of a tank.
  4. Maintenance Requirements

    Any tank which does not comply with any provision of this rule shall be brought into compliance within 72 hours of the determination of non-compliance.

  5. Reporting and Recordkeeping Requirements

    (A)All inspections shall be recorded on compliance inspection report forms approved by the Executive Officer as described in Attachment B - "Inspection Procedures and Compliance Report Form."

    (B)All compliance inspection reports and documents shall be submitted to the Executive Officer within 5 working days of completion of the self-inspection.

    (C)If a tank is determined to be in violation of the requirements of this rule, a written report shall be submitted to the Executive Officer within 120 hours of the determination of non-compliance, indicating corrective actions taken to achieve compliance.

    (D)All records of owner or operator inspection and repair shall be maintained at the facility for a period of 3 years and shall be made available to the Executive Officer upon request.

    (E)Emissions Reporting

    (i)An owner or operator shall provide emissions information in a format consistent with Attachment C to the Executive Officer upon request. The requirement shall apply to all organic liquid storage tanks without regard to exemptions specified in subdivision (f).

    (ii)An owner or operator shall provide all upset emissions information associated with product change, repair, and turnover or any other excess emission incidents.

      1. An owner or operator shall maintain records of emissions data for all organic liquid storage tanks for the most recent two (2) year period.

     

    (f)Exemptions

    The provisions of this rule shall not apply to the following tanks, provided the person seeking the exemption supplies proof of the applicable criteria sufficient to satisfy the Executive Officer:

    (1)Oil production tanks with a capacity of between 75,000 liters (19,815 gallons) and 159,000 liters (42,008 gallons) which have a properly maintained vapor-tight roof and are equipped with a pressure-vacuum valve which is set within 10 percent of the maximum allowable working pressure of the tank, are exempt from the control requirements of this rule when:

    (A)The organic liquid contents fail to comply with paragraph (b) only when heated for shipment, and such heating occurs for not more than 48 hours and not more than once in any 20-day period; or

    (B)The tank has a monthly average throughput of not more than 30 barrels of oil per day and was constructed prior to June 1, 1984.

    (2)Tanks being brought into compliance within the time period specified in paragraph (e)(4).

     

    (g)Test Methods

    (1)Efficiency of a vapor recovery system specified in subparagraph (c)(3)(C) shall be determined according to SCAQMD Test Method 501.1 for the determination of total organic compound emissions. EPA Methods 25 or 25A may be used, as applicable, in place of SCAQMD Test Method 25.1 specified in Method 501.1. An efficiency determined to be less than established by this rule through the use of any of the above-referenced test methods shall constitute a violation of the rule. Baseline emissions shall be calculated by using the criteria outlined in American Petroleum Institute Bulletin 2518.

    1. Exempt compounds shall be determined according to SCAQMD Test Method 303. For the purpose of testing the efficiency of a vapor recovery system, exempt compounds shall be determined according to EPA Method 18 or ARB Method 422. Any test method(s) for exempt compounds which cannot be identified through these referenced test methods shall be specified by the owner of operator seeking an exemption and shall be subject to approval in accordance with the procedures set forth in paragraph (g)(6).

(3)The Reid vapor pressure specified in paragraph (b)(3) and the Reid vapor pressure used in determining the true vapor pressure limit specified in paragraph (d)(5) shall be determined according to ASTM D-323-82 or California Code of Regulations, Title 13, Section 2297.

(4)Vapor tight condition specified in subparagraphs (c)(3)(A) and (c)(3)(B) shall be determined according to EPA's Reference Method 21 subject to the following limitations:

(A)vapor tight condition shall be determined at a distance of 1 cm. or less from the source ; and

(B)the soap bubble test shall not be used in lieu of quantitative test methods for vapor tightness determination.

(5)The hydrogen sulfide concentration limit specified in paragraph (d)(4) shall be determined according to SCAQMD Method 315.

(6)Alternate test methods which are new methods not previously referenced in this rule, or which involve major changes to a referenced test method, may be used if they are approved in advance as a source-specific SIP revision by the United States Environmental Protection Agency and the California Air Resources Board, and have been authorized by the Executive Officer.

 

 

[SIP Approved 10/28/96, 61 FR 54941, 40 CFR 52.220(c)(197)(i)(A)(2); Approved 1/15/87, 52 FR 1627, 40 CFR 52.220(c)(156)(vii)(A); Approved ______, _______, 40 CFR 52.220(c) (42)(xvi)(A); Approved 9/8/78, 43 FR 40011, 40 CFR 52.220(c)(31)(vi)(A)]

RULE 463 - ADDENDUM

Storage Temperatures Versus Actual Vapor Pressure

(Gravity/Initial Boiling Points Referenced)

 

Reference Property

Temperature, oF Not to Exceed Vapor Pressure

 

A - oAPI

B - IBP, o

 
Organic Liquids

 A 

 B 

0.5 psia

1.5 psia

  Crude Oils

12

--

--

--

   

13

--

120

180

   

14

--

85

145

   

16

--

60

107

   

18

--

55

93

   

20

--

52

84

   

22

--

49

77

   

24

--

45

73

   

26

--

42

70

   

28

--

40

67

   

30

--

38

64

Middle Distillates        
  Kerosene

42.5

350

195

 
  Diesel

36.4

372

230

250

  Gas Oil

26.2

390

249

290

  Stove Oil 23

421

275

340

310

Jet Fuels        
  JP-1

43.1

330

165

230

  JP-3

54.7

110

--

25

  JP-4

51.5

150

20

68

  JP-5

39.6

355

205

260

  JP-7

44-50

360

205

260

Fuel Oil        
  No. 1

42.5

350

195

250

  No. 2

36.4

372

230

290

  No. 3

26.2

390

249

310

  No. 4

23

421

275

340

  No. 5

19.9

560

380

465

  No. 6

16.2

625

450

--

Asphalts        
  60 - 100 pen.

--

--

490

550

  120 - 150 pen.

--

--

450

500

  200 - 300 pen.

--

--

360

420

Acetone

47.0

133

--

35

Acrylonitrile

41.8

173

30

60

Benzene

27.7

176

35

70

Carbon Disulfide

10.6

116 (lb/gal)

--

10

Carbon Tetrachloride

13.4

170

30

60

Chloroform

12.5

142 (lb/gal)

--

40

Cylohexane

49.7

177

35

70

1,2 Dichloroethane

10.5

180 (lb/gal)

35

77

Ethyl Acetate

23.6

171

35

70

Ethyl Alcohol

47.0

173

45

83

Isopropyl Alcohol

47.0

181

45

87

Methyl Alcohol

47.0

148

--

50

Methylene Chloride

11.1

104 (lb/gal)

--

70

Methylethyl Ketone

44.3

175

30

70

1,1,1-Trichloroethane

11.2

165 (lb/gal)

60

100

Trichloroethylene

12.3

188 (lb/gal)

50

91

Toluene

30.0

231

73

115

Vinyl Acetate

19.6

163

--

60

           

Floating Roof Tank Seal Categories

Primary Seals

 

Category A

Category B

Category C

1.

Liquid mounted multiple wipers with drip curtain and weight Liquid mounted single wiper with drip curtain and weight Liquid mounted single wiper

2.

Liquid mounted mechanical shoe Liquid mounted double foam wipers with vapor curtain Liquid mounted foam log

3.

  Vapor mounted primary wiper Liquid mounted foam log with vapor curtain

4.

  Vapor mounted E wiper Liquid mounted resilient toroid type liquid filled log

5.

  Vapor mounted double wipers Vapor mounted foam log/bag

6.

  Vapor mounted double foam wipers Vapor mounted foam wiper

7.

  Vapor mounted multiple wipers  
 

Secondary Seals

 

Category A

Category B

Category C

1. Multiple wipers Single wiper Liquid mounted wiper
Foam log/bag
Maloney

Criteria used for categorization of floating roof tank seals:

1.Emission control effectiveness design

2.Ability to maintain contact with tank wall

3.Longevity in service

 

 


ATTACHMENT B

INSPECTION PROCEDURES AND COMPLIANCE REPORT FORM

Equipment Needed:

Explosimeter (for internal floating roof tanks), liquid resistant measuring tape or device, tank probe (to measure gaps in tank seals - 1/8 inch, 1/2 inch, 1-1/2 inch), flashlight.

Inspection Procedures:

  1. The findings of all tank self-inspections, whether completed or not, shall be recorded on the Rule 463 Compliance Report form prescribed by the Executive Officer and submitted to the District's Refinery Section in accordance with the rule's requirements. If an inspection is stopped before completion, indicate the reason for this action in the Comments section of the compliance report form.

  2. During compliance inspection, the person(s) conducting the inspection must have a copy of the Permit to Operate or Permit to Construct pertinent to the tank being inspected. Any discrepancies between the permit equipment description and the existing tank or the permit conditions and the actual operating conditions of the tank as verified during inspection must be recorded in the Comments section of the compliance report form.

  3. Inspect the ground level periphery of each tank for possible leaks in the tank shell. Complete the tank information section (D) on the report.

  4. For external floating roof tanks:

  5. For internal floating roof tanks:

  6. Complete all necessary calculations and record all required data accordingly on the report.




ANTELOPE VALLEY AIR POLLUTION CONTROL DISTRICT

RULE 463 COMPLIANCE REPORT

 

**PLEASE COMPLETE FORM LEGIBLY IN BLACK INK**

 Tank No. SCAQMD Permit No:   Inspection Date:  Time: _______________  
_______________  _____________________  _____________________     
 Is this a follow-up inspection? __ Yes __ No  If Yes, date of Previous Inspection: __________________  
 
 A. COMPANY INFORMATION:      

 Company Name:

 ______________________________________________________________________________________

 Location Address:

 ______________________________________________  City: ________________  ZIP: _____________

 Mailing Address:

 ______________________________________________  City: ________________  ZIP: _____________

 Contact Person:

 ______________________________________________  Title: __________________________________
 
 B. INSPECTION CONDUCTED BY:

Name:

 ______________________________________________  Title: __________________________________

Company Name:

 ______________________________________________ Phone: (___) __________________________

Mailing Address:

 ______________________________________________  City: ________________  ZIP: _____________
 
 C. TANK INFORMATION:

 Capacity: __________(bbls)

Installation Date: __________________

 Tank Diameter: ____________________ (ft)

Tank Height: _______________ (ft)

 
Product Type: _________________________  Product RVP: ________________ If Crude, H2S Content:  ________________ (ppm weight)
Type of Tank:         
  Riveted:  o  Welded:  o  Other  o (describe) ______________________________
   Color of Shell: ___________________________________  Color of Roof: ______________________________
 Type of Roof:        
  Pontoon:  o    Double Deck:  o Other  o (describe) ______________________________ 
  External floating roof:  o   Internal floating roof:  o    
 
 D. GROUND LEVEL INFORMATION:
 1) Product Temperature: _______________ oF   2)  Product level ________________________ (ft)
 3) List type and location of leaks found in tank shell.      
 
 4) List any discrepancies between the existing equipment and the equipment description on the Permit.
 
 5) Is tank in compliance with permit conditions:  ___ No ___ Yes  
 If no, explain _______________________________________________________________________________________________
  ________________________________________________________________________________________________________
  ________________________________________________________________________________________________________
 
 E. INTERNAL FLOATING ROOF TANK:
 1) Check vapor space between floating roof and fixed roof with expiosimeter. _______________ % LEL  
 2) Conduct visual inspection of roofs and secondary seals, if applicable.  
 3) Are all roof openings covered? ____ No ____ Yes If No, explain in comments section (J) and proceed to part (H)(6). 
 
 F.  EXTERNAL FLOATING ROOF TANK:
 1) On the diagram (below) indicate the location of the ladder, roof drain(s), anti-rotation device(s), platform, gauge well, and vents or other appurtenances. Note information in relation to North (to the top of the worksheet).
 2) Describe any uncovered openings found on the roof in the Comments section (J). (Refer to Rule 463(a)(1)(F)):
 3) Identify any tears in the seal fabric. Describe and indicate on diagram (below):
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 4) Secondary Seal Inspection:      
 a) Type of Secondary Seal: ___________________________________________________________________________________
 b) Does 1/2¨ probe drop past seal?  ____ No ____ Yes if yes, measure length(s) and show on diagram
 c) Does 1/8¨ probe drop past seal?  ____ No ____ Yes if yes, measure length(s) and show on diagram 
 d) Record dimensions of pag for gaps  > 1/8¨ ____ > 1/2¨ ____    
 NOTE: Record the actual width and cumulative length of gaps in feet and inches.
(Do not include gaps > 1/2" in 1/8" measurements) 
 5) Primary Seal Inspection:
 a) Type of Primary Seal:

 o Shoe; o Tube; o Other

 _________________________________________
 b) (shoe seal) does 1-1/2" probe drop past seal?  ____ No ____ Yes  if yes, measure length(s) and show on diagram
 c) (shoe seal) does 1/2" probe drop past seal?  ____ No ____ Yes  if yes, measure length(s) and show on diagram
 d) (tube seal) does 1/2" probe drop past seal?  ____ No ____ Yes  if yes, measure length(s) and show on diagram
 e) (all seal types) does 1/8" probe drop past seal?  ____ No ____ Yes  if yes, measure length(s) and show on diagram
 f) Record dimensions of gaps for gaps      
  > 1/8" _________________   > 1/2" _________________   > 1-1/2" _________________
   NOTE: Record the actual width and cumulative length of gaps in feet and inches.
   (Do not include gaps > 1/2" in 1/8" measurements, or gaps > 1-1/2" in 1/2" measurements)
 
 NOTE: Show defects using symbols. Show seal gaps and lengths.    
 

 N

     
   


IF INTERNAL FLOATING ROOF TANK, PROCEED TO PART H(6).
G. CALCULATIONS - complete all applicable portions of the following:     
  Record dimensions of indicated gaps [from F(4)(d), F(5)(b), and F(5)(f)]. Record in feet and inches. 
     Gaps in primary seal between 1/8 and 1/2 inch: ________________________________________ 
     Gaps in primary seal between 1/2 and 1-1/2 inch: ________________________________________  
     Gaps in primary seal greater than 1-1/2 inches: ________________________________________  
     Gaps in primary seal greater than 1-1/2 inches: ________________________________________  
    Gaps in secondary seal between 1/8 and 1/2 inch:  ________________________________________  
     Gaps in secondary seal greater than 1/2 inch: ________________________________________  
  Multiply diameter (ft) of tank to determine appropriate gap limits:   
   

 5% circumference = diameter X 0.157 =

________________  60% circ. = diam. X 1.88 = ________________ 
   

 10% circumference = diameter X 0.314 =

________________   90% circ. = diam. X 2.83 = ________________
   

 30% circumference = diameter X 0.942 =

________________   95% circ. = diam. X 2.98 = ________________ 
 
H.  DETERMINE COMPLIANCE STATUS OF TANK:    
   1)  Were any openings found on the roof?   ___ No ___ Yes   
   2)  Were any tears in the seals found:    ___ No ___ Yes  
   3)  Is the product level lower than the level at which the roof would be floating?  ___ No ___ Yes  
   4)  Secondary Seal      
    Did 1/2" probe drop between shell and seal?    ___ No ___ Yes  
    Did cumulative 1/8" - 1/2" gap exceed 95% circumference length?  ___ No ___ Yes  
   5) Primary Seal       
Shoe    Did 1-1/2" probe drop between shell and seal?    ___ No ___ Yes  
    Did cumulative 1/2" - 1-1/2" gap exceed 30% circumference length, and    ___ No ___ Yes  
    Did cumulative 1/8 - 1/2" gap exceed 60% circumference length?  ___ No ___ Yes  
    Did any single continuous 1/8" - 1-1/2" gap exceed 10% circ. length?  ___ No ___ Yes  
           
Tube   Did 1/2" probe drop between shell and seal?    ___ No ___ Yes  
    Did cumulative 1/8" - 1/2" gap exceed 95% circumference length?  ___ No ___ Yes  
   6) Internal floating roof (installed before 6/1/84) did LEL exceed 50%    ___ No ___ Yes  
    (installed after 6/1/84) did LEL exceed 30%?     ___ No ___ Yes  
  7) Does tank have permit conditions?     ___ No ___ Yes  
    Does tank comply with these conditions?      ___ No ___ Yes  
 
 I. IF INSPECTION WAS TERMINATED PRIOR TO COMPLETION FOR ANY REASON, PLEASE EXPLAIN:
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 
 J. COMMENTS:
 Use this section to complete answers to above listed items and to describe repairs made to the tank; include date and time repairs were made.
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 _________________________________________________________________________________________________________
 K. I(We) certify the foregoing information to be correct and complete to the best of my(our) knowledge.
Inspection completed by:  _________________________________  ________________________  Date:________ 
   (signature)  (certification ID #)  
       
Compliance status by:  _________________________________  ________________________  Date:________  
  (signature)  (certification ID #)  
       
Company Representative:  _________________________________  ________________________  Date:________  
   (signature)  (certification ID #)  

SEND COMPLETED REPORT TO:

ANTELOPE VALLEY AIR POLLUTION CONTROL DISTRICT
P.O. BOX 4409
LANCASTER, CA 93539-4409
FAX (661) 723-3450




The data items shall include, but not be limited to, the following:

A. External Floating Roof Tank B. Internal Floating Roof Tank C. Roof Tank

1.

Tank I.D.

1.

Tank I.D.

1.

Tank I.D.

2.

Product Code

2.

Product Code

2.

Product Code

3.

Type of Floating Roof Seal

3.

Type of Floating Roof Seal

3.

Vent Type to Vapor Recovery System

4.

Shell Construction

4.

Shell Construction

*4.

Average Stock Storage Temperature

5.

Reid Vapor Pressure

5.

Reid Vapor Pressure

5.

True Vapor Pressure

*6.

Average Stock Storage Temperature

*6.

Average Stock Storage Temperature

6.

Tank Diameter

7.

True Vapor pressure

7.

True Vapor Pressure

*7.

Vapor Molecular Weight

8.

Tank Diameter

8.

Tank Diameter

8.

Average Outage

*9.

Wind Speed Exponent

*9.

Wind Speed Exponent

*9.

Average Daily Temperature Change

*10.

Average Wind Velocity

*10.

Average Wind Velocity

10.

Throughput

*11.

Seal Factor

*11.

Seal Factor

11.

Turnover Factor

*12.

Product Factor

*12.

Product Factor

*12.

Turnovers Per Year

*13.

Vapor Molecular Weight

*13.

Vapor Molecular Weight

*13.

Adjustment Factor for Small Tank

*14.

Clingage Factor

*14.

Clingage Factor

*14.

Paint Factor

15.

Throughput

15.

Throughput

*15.

Crude-Oil Factor (Breathing)

*16.

Density of Liquid Stock

*16.

Density of Liquid Stock

*16.

Crude-Oil Factor (Working)

17.

Total Number of Different Type of Fitting

*17.

Number of Columns

17.

Breathing Loss

18.

Total Roof Fitting Loss Factor

*18.

Effective Column Diameter

18.

Working Loss

19.

Vapor Pressure Function

19.

Total Number of Different Types of Fittings

19.

Total Loss (Without Vapor Recovery)

20.

Roof Fitting Loss

*20.

Total Deck Fitting Loss Factor

*20.

Vapor Recovery System Efficiency

21.

Standing Loss

21.

Vapor Pressure Function

21.

Total Loss (With Vapor Recovery)

22.

Withdrawal Loss

*22.

Deck Seam Length Factor

22.

Number of Excess Upset Emissions Incidents

23.

Total Loss

*23.

Deck Seam Loss per Unit

23.

Total Excess Upset Emissions

24

Number of Excess Upset Emissions Incidents

24.

Deck Seam Loss    

25.

Total excess Upset Emissions

25.

Deck Fitting Loss    
   

26.

Standing Loss    
   

27.

Withdrawal Loss    
   

28.

Total Loss    
   

29.

Number of Excess Upset Emissions Incidents    
   

30.

Total Excess Upset Emissions    

*Default values are available from the District

The Data format and order shall be specified and approved by the Executive Officer.

 

 

A

B

C

D

E

F

G

H

I

J

K

L

1

TANK I.D.

PRODUCT CODE

TYPE OF FLOATING ROOF SEAL

SHELL CONSTRUCT.

REID VAPOR PRESSURE

AVE. STOCK STOR. EMP.

TRUE VAPOR PRESSURE

TANK DIAMETER

WIND SPEED EXP.

AVE. WIND VELOCITY

SEAL FACTOR

PRODUCT FACTOR

2

       

psi

F

psia

feet

 

mile/hour

   

3

1

6

1C

W

2

68

1.1

80

1

6.8

0.2

0.4

4

2

3

1C

W

0.03

68

0.01

95.5

1

6.8

0.2

1

5

3

9

1C

W

0

68

0

95.5

1

6.8

0.2

1

6

4

3

1C

W

0.03

68

0.01

90

1

6.8

0.2

1

7

25

5

4A

R

0.2

68

0.01

117.2

1.5

6.8

1.3

1

8

26

5

1A

W

0.2

68

0.01

120

1.5

6.8

1.2

1

9

27

9

1A

W

0

99

0

120

1.5

6.8

1.2

1

 

M

N

O

P

Q

R

S

T

U

V

1

VAPOR
MOLECULAR
WEIGHT

CLINGAGE
FACTOR

THROUGHPUT

DEN. OF LIQUID
STOCK

TOTAL NO. OF
DIFF. TYPE OF
FITTING

TOTAL ROOF
FITTING LOSS
FACTOR

VAPOR
PRESSURE
FUNCTION

ROOF FITTING
LOSS

STANDING
LOSS

WITHDRAWAL
LOSS

2

lb/lb Mole

bbl/1000 sq. ft.

bbl/year

lb/gal

 

lb mole/year

 

lbs/year

lbs/year

lbs/year

3

50

0.6

334914

7.1

3

147.3

2

55

42

168

4

130

0.15

234841

7.1

3

152.3

0

3

3

25

5

190

0.15

73651

7.9

3

152.3

0

0

0

9

6

130

0.15

151702

7.1

3

146.6

0

3

2

17

7

130

0.15

184615

7

3

158.6

0

3

60

16

8

130

0.15

2223784

7

3

162.1

0

3

19

183

9

190

0.15

773173

7.9

2

162.1

0

0

0

72

 

W

X

Y

1

TOTAL LOSS

NO. OF
EXCESS UPSET
INCIDENTS

TOTAL UPSET
EMISSIONS

2

lbs/year

 

lb/year

3

265

0

0

4

30

2

0.1

5

9

0

0

6

22

0

0

7

79

0

0

8

206

0

0

9

73

0

0

 

A

B

C

D

E

F

G

H

I

J

K

L

1

TANK I.D.

PRODUCT CODE

TYPE OF FLOATING ROOF SEAL

SHELL CONSTRUCTION

REID VAPOR PRESSURE

AVE. STOCK STOR. EMP.

TRUE VAPOR PRESSURE

TANK DIAMETER

WIND SPEED EXP.

AVE. WIND VELOCITY

SEAL FACTOR

PRODUCT FACTOR

2

       

psi

F

psia

feet

 

mile/hour

   

3

12

2

5A

W

3.4

140

6.2

64

0

6.8

3

0.4

4

13

2

6A

W

3.4

140

6.2

64

0

6.8

6.7

0.4

 

M

N

O

P

Q

R

S

T

U

V

1

VAPOR
MOLECULAR
WEIGHT

CLINGAGE
FACTOR

THROUGHPUT

DEN. OF LIQUID
STOCK

NO. OF
COLUMNS

EFFECTIVE
COLUMN
DIAMETER

TOTAL NO. OF
DIFF. TYPE OF
FITTING

TOTAL DECK
FITTING LOSS
FACTOR

VAPOR
PRESSURE
FUNCTION

DECK SEAM LEN.
FACTOR

2

lb/lb Mole

bbl/1000 sq. ft.

bbl/year

lb/gal

 

feet

 

lb mole/year

 

1/ft

3

50

0.006

466095

7.1

1

1

0

105

0.14

0

4

50

0.006

466095

7.1

1

1

0

210

0.14

0

 

W

X

Y

Z

AA

AB

AC

AD

1

DECK SEAM
LOSS PER UNIT

DECK SEAM LOSS

DECK
FITTING
LOSS

STANDING
LOSS

WITHDRAWAL
LOSS

TOTAL LOSS

NO. OF
EXCESS UPSET
INCIDENTS

TOTAL UPSET
EMISSIONS

2

lb mole/ft year

lbs/year

lbs/year

lbs/year

lbs/year

lbs/year

 

lbs/year

3

0

0

286

523

297

1106

0

0

4

0

0

571

1167

297

2035

0

0

 

A

B

C

D

E

F

G

H

I

J

K

1

TANK I.D.

PRODUCT CODE

VENT TYPE TO
VAPOR RECOVERY
SYSTEM

AVE. STOCK
STOR. TEMP.

TRUE VAPOR
PRESSURE

TANK
DIAMETER

VAPOR
MOLECULAR
WEIGHT

AVE.
OUTAGE

AVE. DAILY
TEMP. CHANGE

THROUGHPUT

TURNOVER
FACTOR

2

       

psi

F

psia

feet

F

bbl/year

 

3

210

9

N

99.99

0

120

190

14

16

300027

1

4

285

9

N

99.99

0

35

190

0

16

151414

1

5

286

9

N

99.99

0

35

190

0

16

151414

1

6

294

9

V

68

0

120

190

20

16

505615

1

 

L

M

N

O

P

Q

R

S

T

1

TURNOVERS PER YEAR

ADJ. FACTOR FOR
SMALL TANK

PAINT FACTOR

CRUDE OIL FACTOR
(BREATHING)

CRUDE OIL
FACTOR
(WORKING)

BREATHING
LOSS

WORKING LOSS

TOTAL LOSS
(W/O VAPOR
RECOVERY)

VAPOR RECOVERY
SYSTEM EFFICIENCY

2

         

lbs/year

lbs/year

lbs/year

 

3

4

1

1

1

1

56

3

60

0

4

30

1

1

1

1

0

2

2

0

5

30

1

1

1

1

0

2

2

0

6

6

1

1

1

1

68

6

74

95

 

U

V

W

1

TOTAL LOSS (w/
vapor
recovery)

NO. OF EXCESS
UPSET EMISSIONS
INCIDENTS

TOTAL UPSET
EMISSIONS

2

lbs/year

 

lb/year

3

60

0

0

4

2

0

0

5

2

0

0

6

4

0

0