Why does the trap leak?
As a dividing point between the steam system and the condensate system, the steam trap is an important node for isolating the steam leak. If the trap leaks, it will cause huge energy waste. So why does the steam trap leak?
Watt's energy saving experience is first to distinguish between steam leaks and normal flash steam. It is generally seen that there is less condensate discharge or a large amount of steam leakage at the outlet end of the trap, indicating that the trap requires maintenance. Of course, visual assessment is only available for open systems.
The secondary steam is also called flash steam. When the high-pressure saturated condensate is discharged into the low-pressure environment, the "sensible heat" of the low-pressure saturated condensate is lower, and the higher "sensible heat" condensate discharged by the trap will be Secondary evaporation in a low pressure environment to absorb excess "sensible heat". The steam that we partially vaporize this part is called secondary steam. The proportion of secondary steam is related to the pressure difference before and after the condensed water. The larger the pressure difference, the larger the proportion of secondary steam.
With the switching of the trap, the secondary steam will change accordingly. If the flow of the steam does not change, and there is a certain whistling sound, this generally indicates that the trap has leaked.
Due to the water in the secondary steam, the secondary steam usually has a milky white color. If the steam outlet is close to the steam on the side of the trap, there is a longer transparent section (10 cm or more), which indicates that the trap is likely to leak. Fresh steam.
Steam traps separate and condense condensate from a mixture of steam and condensate under high pressure conditions to avoid leakage of fresh steam. Steam traps must combine pressure (container) components and precision machinery to provide long-term and demanding conditions. Steam traps need to maintain sufficient strength and durability. Therefore, the most common cause of trap leakage is the failure of the seal pair consisting of the trap valve seat.
There are many reasons for the failure of the trap seal. The trap valve seat must be of sufficient material and subjected to proper heat treatment to enhance the hardness and wear resistance of the seal pair. Otherwise, the two-phase flow passing through at high speed is easily prematurely invalid due to erosion, erosion, cavitation and the like.
For thermostatic steam traps, Watt Energy believes that the key components of such valves are temperature sensors such as bellows or bimetals. The performance and durability of such traps depend to a large extent on the quality of the temperature sensing components. Corrosion resistance and welding stress of the bellows membrane, and the fatigue resistance of the bimetal is a consideration for such trap leakage.
For mechanical traps, the jamming of the mechanism is another cause of trap leakage. For example, a lever float trap is easier than a free float trap to cause a trap to leak due to a mechanism jam. The inverted bucket trap also leaks the trap due to the bias of the lever. Therefore, the design and assembly of the internal mechanism of the trap has a direct impact on the trap leakage.
Mechanical traps have strict mounting orientation requirements, and incorrect installation and inaccurate installation can also cause trap leakage.
Steam trap leakage is sometimes related to over-selection. Excessive size will not only reduce the service life of the trap, but also cause excessive wear due to frequent switching and long-term micro-opening. The leak rate of the trap design is based on the designed maximum displacement. The resulting actual operating leakage is high.
The steam trap leakage is also closely related to the structure of the trap. The double seat will leak far more than the single seat, and only the mechanically sealed trap will leak more easily.
If the impurities such as welding slag and impurities after the installation of the pipeline and the trap are improperly handled, the steam trap may be leaked. It is very important to clean the pipelines for new construction and installation, and to clean the filters regularly to remove scale and impurities generated during the initial operation.
According to the past practical experience of Watt energy conservation, we believe that it should be cleared once a week in the month after it is put into operation; between one month and three months after being put into operation, it should be cleared once a month, every 6 months thereafter. Perform a cleaning.
Sometimes siphoning and hydrophobic applications will deliberately leak a part of the steam due to the trap of the trap. Due to the small selection or start-stop of the trap, Watt saves the worker to habitually open the trap bypass, and the trap bypass valve operation error. (forgetting to close) and leaking (closed) are a common phenomenon of trap leaks.
Excessive selection of thermodynamic steam traps, or low temperature environment, large wind speed, rain, humidity and other working conditions, will cause the trap to move excessively, increasing the impact of wear and greatly reducing the service life of the trap. And the trap leakage rate is high.
The reason for the leakage of the trap is more complicated, but the high-quality steam trap such as watt is the basis, the selection and installation of steam, and the good maintenance and management of the trap can effectively reduce the steam leakage of the steam trap.
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