PFI ES-4-2013 HYDROSTATIC TESTING OF FABRICATED PIPING.pdf

1、PFI Standard ES-4 |Denotes Revision (Revised December 2013) HYDROSTATIC TESTING OF FABRICATED PIPING Prepared by Pipe Fabrication Institute Engineering Committee All PFI Standards are advisory only. There is no agreement to adhere to any PFI Standard and their use by anyone is entirely voluntary. Co

2、pyright by PIPE FABRICATION INSTITUTE Dedicated to Technical Advancements and Standardization in the Pipe Fabrication Industry Since 1913 USA 511 Avenue of Americas, # 601 New York, NY 10011 CANADA 655, 32ndAvenue, # 201 Lachine, QC H8T 3G6 WEB SITE www.pfi-institute.org PFI Standard ES-4 |Denotes R

3、evision (Revised December 2013) HYDROSTATIC TESTING OF FABRICATED PIPING 1. Scope 1.1 To establish a standard for hydrostatic testing of fabricated piping. 2. Time of Tests 2.1 Hydrostatic testing of fabricated piping assemblies is usually accomplished after installation when the completed system is

4、 tested. Testing of sub- assemblies in the fabricators shop may be necessary when the completed system is designed and/or supported so that it cannot be filled with water or when the system cannot be readily dried and traces of the test medium cannot be tolerated in the system. In any case, piping a

5、ssemblies are hydrostatically tested in the shop only when so specified in the contract documents. 3. Preparation for Testing 3.1 All joints, including welds, shall be left uninsulated and exposed for examination during the test. 3.2 All openings should be sealed using plugs, blind flanges, weld cap

6、s, or other suitable material, which can be readily and completely removed after completion of the test. 3.3 Means shall be provided to isolate the assembly being tested from the fill piping and pump by using a valve, suitable for the test pressure, and located as close to the assembly as possible.

7、3.4 The need for over pressure protection shall be considered. 4. Testing Procedure 4.1 Assemblies shall be purged of air pockets while being filled. 4.2 Water, at the temperature and chemical content of the available source, shall normally be used for the hydrostatic test fluid. Any special require

8、ments as to chemical content of the water, the use of other test mediums and/or temperature shall be so specified in the contract documents. When conducting pressure test at low metal temperatures, the possibility of brittle fracture should be considered. 4.3 The test equipment shall be examined bef

9、ore pressure is applied to ensure that it is tight and that all low-pressure filling lines and other appurtenances, that should not be subjected to the test pressures, have been disconnected or isolated by valves or other suitable means. 4.4 Following the application of the test pressure, examinatio

10、n for leakage shall be made of all joints and connections. 5. Test Pressure Requirements 5.1 The assembly shall be subjected to a hydrostatic test pressure not less than 1.5 times the design pressure or as specified by the applicable code or contract documents 5.2 The hydrostatic test pressure shall

11、 not exceed the maximum allowable test pressure of any non-isolated component in the assembly. 5.3 The hydrostatic test pressure shall be maintained for a minimum total time of ten minutes or as specified. 6. Pressure Test Gages 6.1 Pressure test gages used in pressure testing shall be indicating pr

12、essure gages and shall be connected directly, where possible, to the component. 6.2 Pressure gages used in testing shall preferably have dials graduated over a range of about double the intended maximum test pressure, but in no case shall the rage be less than 1-1/2 nor more than 4 times the test pr

13、essure. 6.3 Pressure gages shall be calibrated prior to use and in accordance with PFI standard ES-32. 7. Acceptance Standards 7.1 If no indication of leakage is observed, the assembly is considered acceptable. 7.2 If any leakage is observed, its location shall be marked. The assembly shall then be

14、depressurized and the leaks repaired. After repairs have been made, the assembly shall be retested.PFI Standard ES-4 |Denotes Revision (Revised December 2013) 8. Records 8.1 A record of each hydrostatic test shall be made. These records shall include: A. Date of Test B. Identification of Fabricated

15、Piping Assemblies Tested C. Test Medium Used D. Test Pressure and Holding Time E. Gauge range and identification F. Signatures of the Companys Inspector and the Authorized Inspector and Customers Inspector when applicable. 8.2 These records need not be retained after completion of the project unless

16、 required by Code or contract. CURRENT INDEX OF 2014-2015 PFI STANDARDS A complete list of PFI members and available membership CHARTER MEMBERS CONTRACTOR MEMBERS ASSOCIATE MEMBERS AFFILIATE MEMBERS HONORARY MEMBERS Associate and Affiliate member contributors Walter Sperko Sperko Engineering Service

17、s, Inc. Greensboro, NC Thomas Warrelmann Victaulic Company of America Easton, PA Sheryl Michalak Welding Outlets, Inc. Houston, TX PFI Standards and Technical Bulletins are published to serve proven needs of the pipe fabricating industry at the design level and in actual shop operations. Hence, such

18、 needs are continually considered and reviewed by the Engineering Committee of the Pipe Fabrication Institute to provide recommended procedures, which have been demonstrated by collective experiences to fulfill requirements in a manner for Code compliance. However, as the PFI Standards are for minimum requirements the designer or fabricator always has the option of specifying supplementary conditions in the form of requirements beyond the scope of the PFI publications.