Article
Long Term Burst Strength Of PVC Pipe And The 2000PV
April 5, 2010
•Article: Long Term Burst Strength Of PVC Pipe And The 2000PV
By EBAA Iron Sales, Inc.
Over a period of almost three years EBAA performed high pressure proof tests of the 2000PV in various sizes. It was found that the 2000PV test sections held at hoop stress levels of 4000 psi and above for over 20,000 hours indicated no detrimental effect of the restraint on the PVC pipe. After being removed from the long term test, specimens were subjected to quick burst test. These pipe burst at pressures well in excess of the minimum quick burst requirements for the pipe.
In the summer of 1990 EBAA began a long term, proof testing program on the 2000PV mechanical joint restraint for PVC pipe. The testing was to satisfy the requirements of Uni-Bell's UNI-B- 13-87 "Recommended Standard Performance Specification for Joint Restraint Devices for Use with Polyvinyl Chloride (PVC) Pipe". The long term test requirement for this specification called for the internal pressure in the test section be held at twice the rated pressure of the restraint device for 1000 hours without failure. The bulk of our testing was for qualification on DR18, C900 PVC pipe with a pressure rating of 150 psi. The 2000PV is rated the same as the pipe, therefore, the UNI-B-13 required long term test pressure would be 300 psi. EBAA, however, elected to test for 1000 hours at the sustained pressure of 500 psi which is the requirement listed in AWWA C-900 for the pipe alone. The 1000 hour, sustained pressure test is a pipe production process quality control test. Since the pipe is tested to this, we felt that the pipe with restraint should be capable of being tested in the same manner.
Samples of various sizes were placed at 500 psi at different times during the test. All samples were prepared and tested in accordance with the requirements of the UNI-B-13 specification. After the 1000 hour mark was satisfied., the samples were left at this pressure to meet the request of a potential customer. This customer had requested testing at the sustained pressure requirement for 10,000 hours as an added measure of proof of restraint performance.
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