Stonel Asociates, Inc.
January 13, 2000
Re: Testing of the Polylok II new high pressure universal Pipe Seal with Schedule 40 Pipes, SDR-35 sizes 2", 3", & 4" diameters.
To Whom It May Concern:
This report documents and certifies that the new Polylok II high pressure universal Pipe Seal meets or exceeds the Standard Specification for Resilient Connectors Between Reinforced Concrete Manhole Structures, Pipes, and Laterals ASTM designation C923 -98, paragraph 4.1.1, in all but one requirement, the compression set. This particular requirement may be needed or necessary in above or near ground manhole structures. However, it is not needed for its intended purpose since the injection molded flexible rubber like thermoplastic pipe seals are designed for and can only be used as lateral resilient connectors for the influent and effluent pipes in reinforced concrete underground septic tanks and aerobic systems. The resin for the pipe seals is manufactured in compliance with ISO 9001 -1994 standards. In addition the pipe seals are produced by the injection molding method using highly sophisticated tooling, molding machines and inspection equipment operating under computer controlled instrumentation. Two independent certified testing laboratories were commissioned to conduct the required testing as outlined on paragraph 4.1.1 of ASTM standard C923 -98.
The Polylok II pipe seals were secured, with a bolted ring assembly, on a pressure vessel that accommodated one pipe seal. The custom testing unit was designed and calibrated with accurate instrumentation for both hydrostatic pressure (positive load) and vacuum pressure (negative load).
Three each of the three pipe sizes were individually tested. They were inserted into a mounted pipe seal, that was pre-torn to the appropriate size, and subjected to a hydrostatic pressure of 10 psi for a period of ten minutes under all the conditions as per C923 -98 paragraphs 7.1 through 7.5. There was only one water leak in the six tests. This failure was not caused by the pipe seal but by the inability of the 4 inch thin walled SDR-35 pipe to support the Shear Test Requirement of 600 lbs. for a ten minute period. At approximately 500 lbs. in a three minute period the pipe collapsed, distorted in shape and violated the integrity of the pipe seal.
Three intact pipe seals were tested with a vacuum pressure (negative load) of 10 psi, which is equivalent to approximately 20 inches of mercury. The negative load was applied and contained in the pressure vessel reservoir by means of a valve. During the ten minute testing period, at the eight to ten minute time frame all three pipe seals experienced a 1.0 psi vacuum pressure loss. This loss is well within the defined acceptable range as described in ASTM C1227 - 98.
In addition, using the pressure vessel, a burst test was performed on three intact pipe seals following the procedures outlined on ASTM D1599 -88. It required a pressure of 42 psi within a time frame of 60 to 65 seconds for the pipe seals to fail.
Should you have any questions regarding this testing report, please do not hesitate to contact my office.