Chapter describes almost all of the steam trap fault diagnosis and treatment. Some problems are actually systemic problems, not trap problems. For the practical application of each product troubleshooting methods, you can contact the manufacturer to obtain more detailed information. When you find trap does not work, but can not find the reason, you should observe the trap of emissions. If the trap installed test valve, check up is relatively simple. On the contrary, it is necessary to open the outlet connection pipeline. Symptoms and Solutions: I. Cold Valves - No Drain II. Hot Valves - No Drain III. Loss of Steam IV. Continuous Drain V. Slow Heating VI. Somehow Problems VII. Drain If the trap does not discharge condensate, then: A 1. The original design pressure is wrong. 2. Pressure increased, there is no smaller valve installed. 3. Pressure relief valve failure. 4. Boiler pressure gauge reading low. 5. After normal wear, seat hole enlarge. 6. The high vacuum in the return line increases the pressure differential over the operating pressure differential of the trap. B. Condensate or steam does not enter trap 1. The trap in front of the trap is clogged. 2. Other valves on the line containing the trap are damaged. 3. Blocked pipe or elbow. C. Mechanical wear or defects that require repair or replacement. D. Trap body is blocked by dirt, filter should be installed sewage. E. On inverted bucket traps, when the float vent is clogged with dirt, the following measures should be taken: 1. Install the filter. 2. Slightly expand the vent. 3. Place the wire in the vent. F. Float-type trap, if the air vent work is not smooth, then it will produce air resistance phenomenon. G. For thermostatic trap, the bellows components may be damaged due to water hammer, so trap closed. H. Trap disc traps, traps may be installed. Hot Valve - Drain A No condensate flows to trap 1. Traps are installed on leaky bypass valves. 2. The siphon drain in the drying drum is broken or damaged. 3. Water heater coil vacuum, impede emissions. Install vacuum breaker between heat exchanger and steam trap. Steam loss If steam traps emit fresh steam, it may be due to the following: Valve can not be closed 1. Scale blocked the seat hole. 2. Parts worn. B. Inverted barrel traps do not work 1. If trap steaming fresh steam, the first import valve closed for a few minutes, and then slowly open. If this trap to work at this time, indicating the trap is good. 2. Inverted bucket trap does not work, usually due to sudden or frequent changes in steam pressure caused. In this case, a check valve can be installed at positions D and C in the figure. If possible, trap should be installed below the catchment point. C. On the float trap, thermal static components may be damaged and can not shut. Inverted Barrel Schematic Continuous Discharge If the inverted barrels or disc traps are continuously discharged or the float or thermostat trap is fully open, the following factors should be checked: Trap too small 1. Replace the large valve, or install another trap in parallel. 2. A low-pressure occasion may have installed a high-pressure steam trap. At this time should choose the appropriate internal trap body trap. B. Water conditions are not normal. Bubbles in the boiler, so that a large amount of water ran to the steam pipe. A water separator should be installed to change the water supply conditions. Heating slow traps work properly, but the process heating unit heating poor. A. One or more cells are short-circuited. The solution is to install a trap on each line. B. Although it appears effective in treating condensate, the trap option is actually too small. Try the larger trap. C. Trap air handling capacity may not be enough, or the air can not reach the trap. Use auxiliary exhaust air valve. Common problems If the discharge under atmospheric pressure, traps work properly, but a connected to the backwater pipeline found problems, check the following points: A. Backpressure reduces the trap's displacement. 1. Return pipe is too thin - Trap heat. 2. Other traps may spray steam - the steam trap is hot. 3. Clogged air vents on the condensate tank - trap is hot or cold. 4. Back to the water line plug - trap hot. 5. Backwater line super-vacuum - trap cold. Get rid of the illusion of trouble If the steam trap every discharge of condensate, steam ran out, remember that when the condensate to low pressure discharge will form flash steam, but generally in the backwater pipe quickly condenses. See graph 3-2.
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