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Recommended Blow-Down Procedure for Water Columns and Gage Glasses

The importance of proper cleaning and maintenance of the water column and the

water gage glass, or sight glass, cannot be stressed enough. The water column must

he kept clean to ensure the water level in the gage glass accurately represents the

water level in the boiler. Note that the frequency and method of blow-down may affect

service life and performance of the water column and gage glass.

The water gage glass on a boiler enables the operator to visually observe and verify

the actual water level in the boiler. However, if not properly cleaned and maintained,

a gage glass can seem to show that there is sufficient water, when the boiler is

actually operating in a low or low water condition. A stain or coating can develop on

the inside of the glass where it is in contact with boiling water. After a time, this stain

gives the appearance of water in the boiler, especially when theglass is completely

full or empty of water.

Also, the connection lines to the gage glass can become clogged with sediment and

show normal water levels when water may be low. After performingthe blow-down

procedure, if the water level does not return to normal promptly, the connecting piping

may be partially clogged and have to be cleaned.

Clark-Reliance suggests the following blow-down procedure:

1. Close both the steam and water valves between the boiler drumand the water

column or water gage.

2. Open the drain valve fully on the bottom of the water column or water gage.

3. Crack open the steam valve and allow a gentle rush of steam to pass through the

water column or water gage. The steam should not pass through for longer than 20

seconds.

4. Close the steam valve.

5. Inspect the water gage to insure that all foreign matter is flushed from the glass or

mica. If the gage is not visually clean, repeat steps 3 and 4.

6. Close the blow-down valve and simultaneously open the steam and water valves,

slowly bringing the equipment back to a normal operating level.

7. Water should enter the gage glass quickly when the blow-down valve is closed.

This will indicate that the lines are free of sludge, sediment, or scale buildup.

Note:

1. Any trip or alarm circuits that are actuated by the equipment being blown-down

should be bypassed to prevent false alarms during the blow-down process.

2. Blow-down should be conducted on a weekly basis, or as necessary, based on

water quality.

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