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fluorine lining gate valve

Faults and maintenance methods of steam traps

by:Lianke Valve     2022-09-04
The following is an introduction to the common faults encountered when using steam traps and their maintenance methods efficiency. In order to achieve the most ideal effect, it is necessary to have a comprehensive understanding of the working performance and characteristics of the steam trap. Today, I will explain to you the common failures and maintenance methods of steam traps, so that you can easily solve the problems of steam traps! 1. Cold valve - no drainage If the steam trap cannot discharge condensate: the original design pressure is wrong; the pressure rises, and a smaller valve nozzle is not installed; the pressure reducing valve fails; the boiler pressure gauge reading is low; after normal wear, The valve seat hole is enlarged; the high vacuum in the return line increases the differential pressure, which exceeds the operating differential pressure of the trap. Condensate or steam not entering the trap: The filter before the trap is clogged; other valves are damaged in the line where the trap is installed; the line or elbow is clogged. Mechanical wear or defect requiring repair or replacement. The steam trap body is clogged with dirt and a filter should be installed to drain it. For the inverted bucket type trap, when the vent hole of the floating bucket is blocked by dirt, a filter should be installed; the vent hole should be slightly enlarged; and a wire should be placed in the vent hole. For float type traps, if the air vent is not working smoothly, air lock will occur. For thermostatic traps, the bellows element may be damaged due to water hammer, closing the trap. For disc type traps, the trap may be installed backwards. 2. Thermal valve - no drain and no condensate flowing to steam trap: trap installed on leaky bypass valve; siphon discharge pipe in drying drum is ruptured or damaged; vacuum in water heater coil prevents discharge and is replaced during replacement Install a vacuum breaker between the heater and the trap. 3. Steam loss If the steam trap emits fresh steam, it may be caused by the following reasons: A. Valve does not close: Scale is blocking seat hole; parts are worn. b. Inverted bucket trap does not work: If the trap is blowing fresh steam, first close the inlet valve for a few minutes, then slowly open it. If the trap works at this time, it means the trap is good. Inverted bucket traps that do not work are generally caused by sudden or frequent changes in steam pressure. If possible, traps should be installed below the catchment point. c. For float traps, the thermostatic element may be damaged and fail to close. 4. Continuous discharge If the inverted bucket or disc type steam trap discharges continuously, or the float type or thermostatic type steam trap discharges fully open, the following factors should be checked: A. The trap is too small: replace the large valve, or install another trap in parallel; a high-pressure trap may be installed in a low-pressure situation, and a trap with a suitable internal mechanism should be selected at this time. b. Abnormal water supply conditions: Bubble in the boiler, causing a lot of water to run into the steam pipe. A water separator should be installed to change the water supply conditions. 5. The slow heating steam trap works normally, but the heating of the process heating unit is not smooth. A. One or more cells are shorted. The solution is to install a trap on each line. b. Although it appears to be effective in handling condensate, the trap is actually too small. Try a larger trap. c. The trap air handling capacity may not be sufficient, or the air cannot reach the trap. Use an auxiliary exhaust valve.
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