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  • Mustang Technical Information

    Listed to the right are some informational procedures on what to look for when using the Squeeze Tool. Learn about the operation of Mustang Squeeze Tools, the theory of electro static discharge, and safety features that have been implemented into the design and functionality of our devices.

    If you have any questions or concerns about our products, we invite you to contact us with any inquiries you may have.

    The Operation of Mustang Squeeze Tools

    Procedure For Squeezing-off Polyethylene Plastic Pipe Using Mustang Double Bar Squeeze Tools.

    Polyethylene plastic used in gas distribution piping systems has a unique feature of being squeezed-off for flow control and being returned to near original shape without a reduction in pressure rating. Any squeeze-off method must be addressed with properly designed tools and operating procedure. A suggested procedure using Mustang Double Bar Squeeze Tools follows:

    1. Before using any squeeze tool, familiarize yourself with its construction, operation and design features. Operation instructions for mechanical and hydraulic operated tools vary. Training in the correct use of these tools is essential if safe and efficient results are to be achieved.
    2. The PE pipe size should be identified and the proper gap stop on the jaw positioned. Inspect the pipe for surface damage and remove any dirt in the squeeze zone. If possible, inspect the inside surface of the pipe. A glassy smooth finish will permit better squeeze-off than a rippled or rough texture.
    3. The squeeze tool should be grounded for static electric discharge before positioning on the pipe. A 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. Mustang Manfacturing Inc. offers a static electric grounding rod and discharge alarm that adapts to all Mustang tools.
    4. Center and square the squeeze tool, visually, on the pipe by partial (10-15%) squeeze. Determine that the upper jaw is parallel, or level with the lower jaw and an equal space exists between the tool frame and the sides of the pipe. If the upper jaw is sloped or tilted to one side, this indicates that centering is not proper and should be adjusted.
    5. After centering the tool, squeeze the pipe until the hand torque on mechanical tools is "tight". Hydraulic tools will achieve this level at a prescribed gauge pressure. Allow one minute per diameter inch of pipe size for cold flow relaxation. Double this time for temperatures below freezing. After relaxation, re-torque the screw about one-quarter turn. In the case of hydraulic tools, the pressure gauge will show a drop of 150-200 psi and must be re-pumped to the original pressure. Complete squeeze-off should be achieved at this point.
    6. Hydraulic and large mechanical tools use a pair of saddle clamps as mechanical locking devices; locking the jaws in place in the event of a hydraulic failure. The saddle clamps should be installed immediately as explained in the operation instructions for such tool. Saddle clamps can be used on mechanical tools to achieve a more perfect squeeze-off by asserting additional clamping force adjacent to the squeezed pipe folds.
    7. Purging the pipe can be accomplished by controlled opening of the squeeze tool or tool and saddle clamp combination.
    8. Mark the pipe with a clamp or tape to indicate a squeeze-off was made in that area. Repeated squeezing on the same area should be avoided.
  • Electro Static Discharge Theory

    Polyethylene plastic used in manufacturing gas pipe has many advantages over steel and other materials. However, one disadvantage is the problem of electro static build-up caused by gas flowing through the non-conductor that it is. During the normal flow of natural gas in PE pipe, electric charges are moving in the direction of the gas. When squeeze-off occurs, turbulence and gas velocity increase at the squeeze point. Because of the increase in velocity and turbulence, the charges become heavily concentrated at the squeeze point. As the charge increases in density on the inside wall surface, the force increases between the charges inside and the opposing charges on the outside of the pipe. When the force exceeds the dielectric strength of the pipe, the charges move through the pipe and leave a pin hole in the wall. If the squeeze tool is properly grounded, the discharge will move through the squeeze tool to the earth.

    This phenomenon is called "Electro Static Discharge".

  • Safety Features of Mustang Tools

    Squeeze tools are used in an environment that requires the utmost in operational safety. Mustang Manufacturing Inc. has not compromised this requirement for cost reasons or as a means of keeping a competitive edge.

    Some examples are:

    • Mustang "M" and "ML" series hydraulic squeeze tools use a pilot operated cylinder locking valve. This specially designed valve assures the permanent locking of the hydraulic cylinder in the compressive squeeze-off mode. It AUTOMATICALLY locks the cylinder and does not require the operator to remember to close a conventional valve. Upon completion of the squeeze-off, the double acting cylinder is retracted after unlocking the valve hydraulically.
    • Hydraulic tools are powered by Mustang designed and manufactured hydraulic hand pumps and non-conductive high pressure hose assemblies. Hi-Flo Quick Disconnect couplings permit positive connection using a threaded sleeve.
    • Static electric discharge can be monitored using the SDA-30 alarm in conjuction with a Mustang grounding rod. If internal static charge builds and discharges through the pipe wall, the grounding rod-alarm combination will give an alarm and alert the operator to possible pin-hole damage through the pipe wall.