Jerguson 300L Series Installation, Operation & Maintenance Instruction Manual
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10 of 20Cleaning Glass in Steam ServiceProper cleaning and maintenance of flat glass gages in steam service is vital for enhancedperformance and service life. The gage glass must be kept clean to ensure the visible waterlevel in the chamber accurately represents the water level in the boiler. Note that thefrequency and method of blow-down may affect service life and performance of glass levelgages.A glass gage on a boiler enables the operator to visually observe and verify the actual waterlevel in the boiler. However, if not properly cleaned and maintained, a glass gage can appearto show a normal water level when the boiler may actually be operating in a “low” or “low-low”water condition. A stain or coating can develop on the inside of the glass where it is in contactwith boiling water. After time, this stain gives the appearance of water in the boiler, especiallywhen the glass gage is completely full or empty.Also, the connection lines to the glass gage can become clogged with sediment, causing anapparent normal water level when the boiler water may be low. After performing the blow-down procedure, if the water level does not return to the normal level promptly, the connectingpiping may be partially clogged and require cleaning.Clark-Reliance recommends the following blow-down procedure:1. Close both the (top) steam and (bottom) water valves between the boiler drum and thegage.2. Open the drain valve fully on the bottom of the gage.3. Slightly open the water valve to clean the pipe and valve of any blockage or sediment.Once clear, close the water valve.4. Slightly open the steam valve and allow a gentle rush of steam to pass through thegage. The steam should not pass through for longer than 20 seconds.5. Close the steam valve.6. Inspect the gage to ensure that all foreign matter is flushed from the glass or mica.7. If the gage is not visually clean, repeat steps 3 and 4.8. Close the drain valve, open the steam valve ¼ - ½ turn, then open the water valve ¼ -½ turn, slowly bringing the equipment back to its normal operating level. Once thelevel has equalized, fully open both valves. See Bringing Gage into Service for furtherinstructions.9. When bringing the gage into service, liquid should quickly enter the glass gage. Thisindicates that the lines are free of sludge, sediment or scale buildup. |
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