VENAPCD ATTACHMENT 2 EQUIP TNG PCDE FOR NTRL DFT-FRD EQUIP
LAST REVISED 11/11/11

                               ATTACHMENT 2

                        Equipment Tuning Procedure
                     for Natural Draft-Fired Equipment



Nothing in this Equipment Tuning Procedure shall be construed to require
any act or omission that would result in unsafe conditions or would be
in violation of any regulation or requirement established by Factory
Mutual, Industrial Risk Insurors, National Fire Prevention Association,
the California Department of Industrial Relations (Occupational Safety
and Health Division). the Federal Occupational Safety and Health
Administration, or other relevant regulations and requirements.

1.       Preliminary Analysis

         a.   Verify that the boiler, steam generator, or process heater
              (unit) is operating at the lowest pressure or temperature that
              will satisfy load demand.  This pressure or temperature will
              be used as a basis for comparative combustion analysis before
              and after tuneup.

         b.   Verify that the unit operates for the minimum number of hours
              and days necessary to perform the work required.

         c.   Verify that the size of air supply openings is in compliance
              with applicable codes and regulations.  Air supply openings
              must be fully open when the burner is firing and air flow must
              be unrestricted.

         d.   Verify that the vent is in good condition, properly sized and
              free from obstruction.

         e.   Perform a combustion analysis (CO, O2, etc.) at both high and
              low fire, if possible.  Record all data, as well as the
              following: 

              (1)  Inlet fuel pressure at burner at high and low firing
                   rates.
              (2)  Pressure above draft hood or barometric damper at high,
                   medium and low firing rates.
              (3)  Steam pressure, water temperature, or process fluid
                   pressure or temperature entering and leaving the unit.
              (4)  Inlet fuel use rate if meter is available.

2.       Checks & Corrections

         a.   Clean all dirty burners or burner orifices.  Verify that fuel
              filters and moisture traps are in place, clean, and operating
              properly.  Confirm proper location and orientation of burner
              diffuser spuds, gas canes, etc.  Replace or repair damaged or
              missing burner parts.

         b.   Remove external and internal sediment and scale from heating
              surfaces.

         c.   Verify that the necessary water or process fluid treatment is
              being used.  Confirm flushing and/or blowdown schedule.

         d.   Repair all leaks.  In addition to the high-pressure lines,
              check the blow-off, drain, safety valve, bypass lines and, if
              used, the feed pump.

3.       Safety Checks

         a.   Test primary and secondary low water level controls.

         b.   Check operating and limit pressure and temperature controls.

         c.   Check pilot safety shut off operation.

         d.   Check safety valve pressure setting and verify that the
              setting is consistant with unit load requirements.

         e.   Check limit safety control and spill switch.

4.       Adjustments

         Perform the following checks and adjustments on a warm unit at high
         fire:

         a.   Adjust unit to fire at the maximum inlet fuel use rate: record
              fuel manifold pressure.

         b.   Adjust draft and/or fuel pressure to obtain acceptable, clean
              combustion at both high, medium and low firing rates.  The
              carbon monoxide (CO) value should not exceed 400 parts per
              million (PPM) at 3% O2.

              Verify that unit light-offs are smooth and safe.  Perform a
              reduced fuel pressure test at both high and low firing rates
              in accordance with the manufacturers instructions.

         c.   Check and adjust the modulation controller.  Verify proper,
              efficient and clean combustion through the range of firing
              rates.

         When optimum performance has been achieved, record all data.

5.       Final Test

         Perform a final combustion analysis on the warm unit at high,
         medium and low firing rates, if possible.  Record data obtained
         from combustion analysis, as well as the following: 

         a.   Inlet fuel pressure at burner at high and low firing rates.

         b.   Pressure above draft hood or barometric damper at high, medium
              and low firing rates.

         c.   Steam pressure, water temperature, or process fluid pressure
              or temperature entering and leaving the unit.

         d.   Inlet fuel use rate if meter is available.