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t <br /> C. Install bypass piping with globe valve around control valve. Where multiple,parallel control valves are installed, <br /> only one bypass is required , <br /> D. Install vacuum breaker downstream from the control valve and bypass, and as close as possible to the coil inlet <br /> connection. , <br /> E. Install pressure gages at coil inlet connections. <br /> F. Pipe outlet from coils to drip leg. From drip leg,install an appropriate trap,sized at 3 times the condensate load of <br /> the equipment,at 1/2 psig differential. <br /> 3.10 FIELD QUALITY CONTROL <br /> A. Preparation for testing: Prepare steam and condensate piping in accordance with ASME B 31.9 and as follows: <br /> 1. Leave joints including welds umnsulated and exposed for examination during the test. <br /> 2. Provide temporary restraints for expansion joints which cannot sustain the reactions due to test pressure. If <br /> temporary restraints are not practical,isolate expansion joints from testing. <br /> 3. Flush system with clean water. Clean strainers. <br /> 4. Isolate equipment that is not to be subjected to the test pressure from the piping. If a valve is used to isolate <br /> the equipment, its closure shall be capable of sealing against the test pressure without damage to the valve. <br /> Flanged joints at which blinds are inserted to isolate equipment need not be tested <br /> 5. Install relief valve set at a pressure no more than 1/3 higher than the test pressure,to protect against damage by <br /> expansion of liquid or other source of overpressure during the test. <br /> B. Testing: Test steam and condensate piping as follows: <br /> 1. Use ambient temperature water as the testing medium,except where there is a risk of damage due to freezing. <br /> Another liquid may be used if it is safe for workmen and compatible with the piping system components. <br /> 2. Use traps installed at high points in the system to release trapped air while filling the system Use drip legs <br /> installed at low points for complete removal that liquid <br /> 3. Examine system to see that equipment and parts that cannot withstand test pressures are properly isolated <br /> Examine test equipment to ensure that it is tight and that low pressure filling lines are disconnected <br /> 4. Subject piping system to a hydrostatic test pressure which at every point in the system is not less than 1.5 times <br /> the design pressure. The test pressure shall not exceed the maximum pressure for any vessel,pump,valve,or 1 <br /> other component in the system under test. Make a check to verify that the stress due to.pressure at the bottom <br /> of vertical runs does not exceed either 90 percent of specified minimum yield strength, or 1.7 times the "SE" <br /> value in Appendix A of ASME B31.9. <br /> 5. After the hydrostatic test pressure has been applied for at least 10 minutes, examine the system for leakage. <br /> Eliminate leaks by tightening, repairing, or replacing components as appropriate, and repeat hydrostatic test <br /> until there are no.leaks. <br /> 3.11 CLEANING , <br /> A. Flush the system with clean water. Remove,clean,and replace strainer screens. , <br /> END OF SECTION 15520 <br /> 15520-10 No.99132-CP2 <br />