INTREPID | 9 |
CLEANING AND FILLING A NEW STEAM BOILER
I.BEFORE USING STEAM BOILER
A.Check burner to be certain it is ready for firing. DO NOT FIRE into an empty boiler.
B.Be prepared to heat raw water to at least 180°F. as soon as it is introduced into the boiler. This procedure will remove dissolved, corrosive gases.
C.Provide drain line, with valve, from boiler. Use a bottom tapping. Line and drain must be suitable for handling caustic solution.
D.Check for low water
II.CLEAN STEAM BOILER SYSTEM.
A.Fill the boiler to water line indicated on the boiler.
B.Follow
C.Shut down burner, cool down boiler and drain system.
III.FILLING AND VENTING THE STEAM BOILER
A.Refill the boiler to the indicated water line.
B.Bring water to boiling temperature, promptly.
C.The boiler is now ready to be put into service or on standby.
BLOWING OFF A LOW PRESSURE STEAM BOILER
A.A
B.Turn off electrical power supply to boiler. Allow boiler to cool down and steam pressure to reduce to zero before removing skimmer tapping plug. Check for steam pressure by testing the pop safety valve. Keep your hands and all parts of your body away from the discharge end of the safety valve. Drain boiler down one to two inches below skimmer tapping. The water might be hot. Remove skimmer plug slowly and carefully install a 150 psi malleable iron 1- 1/2" NPT street elbow, a
C.Fill boiler slowly until water level is two inches from top of gauge glass. (This is the starting water level for skimming only.) Fire boiler to produce steam. If the system is heavily laden with oil, it may be diffi- cult to obtain much more than a pound or so of pressure. Set the pressure control at about 7 psi. The higher the steam pressure you can use, the better and faster the cleaning.
D.As steam develops, open the SKIMMER drain valve with caution to skim the oil and film from the top of the water. DO NOT open the boil- er drain valve. Close the skimmer drain valve when the water level drops to about 5" from the top of the gauge glass. The water may stop before the level drops to 5" below the top of the glass. Refill boil- er until water level is again two inches from the top of the gauge glass.
E. Repeat (D) above until all film is skimmed off and the water settles to a normal movement. Add make up fresh water to the boiler as described in (D) above, during the
F.When surging has stopped and water is clean, and no film can be seen floating in the bucket, shut off boiler, drain down to level of skim- mer tapping, remove valve, plug skimmer tapping and refill the boiler to
G.The entire process may have to be repeated over a period of a few days on extremely fouled systems.
LOW WATER CUT-OFF CHECK-OUT
I. Electronic probe type low water
If this boiler is factory equipped with an electronic probe type low water
A.While boiler is running, drain down boiler water slowly through Boiler Drain Cock shown on page 4, just until light goes on. Boiler should shut down 10 seconds after light goes on.
B.Be sure that it is the low water
C.Refill the boiler and repeat test.
D.Refill the boiler and reset controls for normal operation.
II.Float type low water
If this boiler is factory equipped with a McDonnell & Miller float type low water