24 July 2003
including Change 1, Jan 2004 and Change 2, March 2005
PMI CHECKLISTS FOR SMALL BOILERS
Table F-1 Steam Boilers PMI Checklist
(Capacities of 117124.2 W (400,000 BTU) per Hour Input or Less)
1. Observe condition of flame. Correct if flame is smoky or if burner starts with a
puff. Flame should not impinge on furnace walls.
2. Test the low water fuel cutoffs for proper sequencing and operation. Blow
3. Test water column or gage glass. Glass must be clean and free of
obstructions. Clean dirty glass and replace defective column or glass at once.
Defects include leaking gage cocks and glass, excessive corrosion, inability to
discern water level, and improper operation.
4. Observe operation of condensate or vacuum pumps. Replace or repair
defective or leaking pumps.
5. Check operation of chemical feed pots and feed pumps. Repair or replace
6. Test flame detection devices and associated automatic fuel cutoff valves. Loss
of flame should shut off flow of fuel to the burner(s). Repair or replace if devices
or valves are defective.
7. Inspect steam supply and condensate return piping, valves, radiators, and traps
for leaks, excessive rust, and damage or lack of insulation. Blow down strainers.
Repair or replace individual items as needed.
8. Inspect fuel supply systems and piping in boilers for leaks, loss of insulation,
etc. Repair or replace as needed. Replace cartridges for in-line oil filters. Adjust
oil pressure as prescribed by the manufacturer. Ensure both oil supply and return
lines have a fusible in-line valve.
9. Check condition of safety valves. Test valve with tri-lever. Valves should
preferably be the pressure type. Leaking safety valves must be replaced. No
obstruction such as another valve, long pipe length, or constriction is permissible
between the boiler and the safety valve. The overflow from the valve should be
free of obstructions and piped to within 4 inches of the floor or to a floor drain.
10. Check boiler room drains for proper functioning.
11. Inspect burner assembly. Evidence of improper fuel nozzle wear, plugging, or
carbon buildup on the nozzle is cause for replacement. Adjust equipment for
proper combustion after replacing the old nozzle with a new one.