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Polyethylene Fitting FAQ

PE Fitting FAQ

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Polyethylene Fitting

A fusion joined pipeline may be thought of as a continuous pipeline without joints. On the other hand, gasket joints are a source of leakage and lost water in many water systems. Leaks may occur if the gasket is improperly installed, if dirt or grit sticks to the gasket, if the gasket is not properly lubricated, if negative pressure (vacuum) occurs in the pipeline, if ground movement or subtrench consolidation occurs, if significant thermal change occurs, or if gaskets are blown out due to surge pressures. Fused joints are generally considered superior to gasket joints for leak prevention.

The amount of  time to make a fusion joint depends on a number of variables such as pipe size, job set-up, and fusion parameters and procedures. With an experienced crew and a Parsethylene machine, a rule of thumb is 1 ½ to 2 minutes per inch of pipe diameter, depending on the DR. Always consult the pipe manufacturer%q%s recommended parameters and procedures in their installation manual. For pipe outside the Iran, use the temperatures prescribed by applicable company, local, state, or federal standards.

No, due to its chemical resistance, adhesives will not bond to polypropylene. Hot air welding and mechanical attachment are recommended techniques for joining parts. for more Information visit Polyethylene welding machinery

The molten joint must be held immobile under force until cooled adequately to develop strength. The proper cooling times for the joint are material, pipe-diameter and wall thickness dependent and are established by the pipe manufacturer. Allowing proper times under force for cooling prior to removal from the clamps of the machine is important in achieving joint integrity.

The amount of time to make a fusion joint depends on a number of variables such as pipe size, job set-up, and fusion parameters and procedures. With an experienced crew and a McElroy machine, a rule of thumb is 1 ½ to 2 minutes per inch of pipe diameter, depending on the DR. Always consult the pipe manufacturer's recommended parameters and procedures in their installation manual. For pipe outside the United States, use the temperatures prescribed by applicable company, local, state, or federal standards.

Always wipe the pipe ends before the facing operation to make sure they are free of dirt and contamination. After facing the pipe, care should be taken to remove all shavings from the fusion area. Brush away loose particles with a clean, non-synthetic cloth. It is not necessary to wipe the pipe ends unless there is contamination present. Always consult the pipe manufacturer's recommended parameters and procedures. For pipe outside the United States, use the temperatures prescribed by applicable company, local, state, or federal standards.

 Generally there are better ways to handle temperature change in an above grade or aerial pipeline than using expansion joints. See Technical Note PP814, "Thermal Effects".  If an expansion joint is used, the joint should be specifically manufactured for use with HDPE pipe. Use of an improper expansion joint such as one designed for steel pipe could damage the PE pipe.

Because of their many advantages, for many situations, swage style reducers have become "regular" for Specified--these are the reducers we will send out most of the time. Unlike other fitting manufacturers who machine all reducers from plate or billet we fabricate these reducers from pipe. When machined from billet material, a reducer with a long reduction and taper both inside and outside will be more expensive to make than one that is "compact" resembling something made from the flat stock. Therefore, these "flat" reducers may seem "regular" to many users of HDPE pipe. However, because we fabricate swage reducers from pipe, they require almost no time in a lathe and are thus more economical--while still maintaining the attractive characterstics of a longer reduction and interior and exterior tapers. In short, our swage style reducers are different than out manufacturer%q%s regular, flat style reducers








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