Waterside Care
3-12
750-368
CBEX Elite 100-1200 HP
The length of each blow should be determined by actual water analysis. Lowering the water in the gauge glass
approximately 1/2” is often acceptable as a guide to adequate blow. However, lowering the water 1/2” should
not be interpreted as a rule since water analysis procedures should prevail. If the glass cannot be viewed by the
party operating the valve, another operator should watch the glass and direct the valve operator.
Close the downstream (slow opening) valve first and as fast as possible. Then close the valve(s) next to the
boiler. Slightly crack the downstream valve and then close it tightly.
Under no circumstances should a blowdown valve be left open. The operator should never leave until the blow-
down operation is completed and the valves are closed.
FIGURE 3-5. Bottom Blowdown Piping
3.8 — Periodic Inspection
Insurance regulations or local laws will require a periodic inspection of the pressure vessel by an authorized
inspector. Sufficient notice is generally given to permit removal of the boiler from service and preparation for
inspection.
When shutting down the boiler, the load should be reduced gradually and the pressure vessel cooled at a rate
that avoids damaging temperature differential that can cause harmful stresses. Vessels should not normally be
drained until all pressure is relieved, to prevent uneven contraction and temperature differentials that can cause
Do not pump the lever action valve open and closed, as water hammer is apt to break the valve bodies or pipe fit-
tings. Failure to follow these instructions could cause damage to the equipment.
Quick opening valve
Quick opening valve
Slow opening valve
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