Test method of steam traps: 1 Scope This standard specifies the steam trap test methods and test equipment. This standard applies to mechanical, thermal and thermodynamic steam traps (hereinafter referred to as traps) factory inspection and type test. 2 test device 2.1 action test, the minimum working pressure test, the maximum working pressure test and the maximum working pressure test device shown in Figure 1. 2.2 leakage test, condensate displacement test, drainage temperature test and the maximum drainage temperature test with the test device shown in Figure 2. 1 2.3 The general requirements of the test device a) high pressure tank volume of not less than 2m3; b) back pressure tank volume of not less than 1m3; c) measuring barrel volume of not less than 0.2m3; d) temperature, pressure, At 0.5 level, the accuracy of chronograph meter is not less than ± 0.2% and resolution is not more than 0.1s; e) All hot-state pipelines and equipment in the device should be insulated. 2 3 Test methods 3.1 Shell test a) Test medium: water, kerosene or other liquids with no more than water; b) Test pressure: 1.5 times of nominal pressure; c) Medium temperature: normal temperature; d) The export side of the closed trap to exert test pressure within the time specified in Table 1, the shell shall not have leakage, the internal parts may not have residual deformation. Nominal diameter / DN Test duration / s ≤ 50> 15 65 ~ 150> 60 Note: When using steam, air and other gases test, there should be safety measures, and approved by the relevant departments. 3.2 Action Test steam traps steam, the trap should be closed, and then introduce a certain load rate of thermal condensation of water, the trap should be open (open the required time with the trap type), after the drainage of hydrophobic drain Valve should be closed again. At least 3 complete cycle, the test is completed. Mechanical trap with a seal lower than the closed float and a design water seal can be tested with air and water. Disc traps in the steam inlet is completely in the state, the valve beating frequency of not more than 3 times / min. For the degree of supercooling the trap of its supercooling is not greater than the design given value. 3.3 The minimum working pressure test According to the provisions of 3.2 action test, while gradually reducing the test pressure until the minimum working pressure. Traps should be properly opened and closed throughout the test. 3.4 The maximum working pressure test 3.2 according to the provisions of the action test, and gradually increase the test pressure until the maximum working pressure. Traps should be properly opened and closed throughout the test. 3.5 Maximum working back pressure test The maximum working pressure under the provisions of 3.2 action test, while gradually increasing the pressure at the outlet of the trap until the trap does not open and close properly. Trap can still be the correct opening and closing of the maximum outlet pressure is the maximum working pressure. 3.6 Pai air capacity test Not more than 0.3MPa of air through the trap, the trap should be able to discharge air, allowing a temporary shutdown of the trap within 5min, but the closure time shall not exceed 1min. 3.7 Drainage temperature test steam to the steam trap to turn it off, and then introduce the saturation temperature of the condensate. If the traps can not be opened immediately, wait for the traps to cool down slowly until the traps are automatically opened. The condensate temperature at the inlet when the traps are on is the valve open temperature. Then gradually raise the temperature of the condensate until the trap is closed automatically and the inlet condensate temperature at shutdown is the valve closing temperature. 3.8 Leakage test At a given working pressure, a steam condensing water with a loading rate of (6 ± 3)% is introduced into the steam trap and saturated steam is supplied to the steam trap to discharge the condensate entering the steam trap into the metering bucket In the heat balance method to calculate the amount of leakage. Leakage test method according to Appendix A requirements. 3.9 Shanghai Hongfeng Valve Factory - Thermal Condensation Discharge Test Thermal discharge capacity is measured at a certain pressure and condensate water temperature measured within a unit of time to discharge the weight of thermal condensation water. Different condensing water pressure differential pressure should be measured at the same undercooling. Under normal circumstances, heat coagulation water displacement test allows the outlet end of the trap open to the atmosphere. Thermal condensation water displacement test method according to the provisions of Appendix B. Note: 3.3 ~ 3.8 above does not apply to pulse and orifice plate traps.
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