Complete squeeze-off should be achieved at this point. After relaxation the pressure gauge will show a drop of 150-200psi and must be re-pumped to the original pressure. Hydraulic tools will achieve a “tight” level at a prescribed gauge pressure. After relaxation, re-torque the screw approximately one-quarter turn. Double this time for temperatures below freezing. If the upper jaw is sloped or tilted to one side, the tool is not properly centered and should be adjusted.Īfter the tool is properly centered, squeeze the pipe until the hand torque on mechanical tools is “tight”.Īllow one minute per diameter inch of pipe size for cold flow relaxation. Visually center and square the squeeze tool on the pipe and then partially squeeze 10-15%.ĭetermine that the upper jaw is parallel, or level, with the lower jaw and that equal space exists between the tool frame and the sides of the pipe. Mustang Manufacturing offers a Static Electric Grounding device that adapts to all Mustang tools. The squeeze tool should be grounded to prevent static electric discharge before positioning it on the pipe.Ī thorough understanding of the phenomenon of external and internal static electric discharge should be included in the training session on the use of squeeze tools. A smooth finish will permit better squeeze-off than a rippled or rough texture. If possible, inspect the inside surface of the pipe. Inspect the pipe for surface damage and remove any dirt from the squeeze zone. The PE pipe size should be identified and the proper gap stop on the jaw positioned. Training in the correct use of these tools is essential if safe and efficient results are to be achieved. Operation instructions for mechanical and hydraulic operated tools vary. A suggested procedure for using Mustang Double-Bar Squeeze Tools is as follows:īefore using any squeeze tool, familiarize yourself with its construction, operation and design features. Any squeeze-off method must be addressed with properly designed tools and operating procedures. Polyethylene plastic used in gas distribution piping systems has a unique feature that allows it to be squeezed-off for flow control and returned to near original shapewithout a reduction in pressure rating.
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