Technical Note 812
MJ Adapter Connections
Performance Pipe MJ Adapters
Performance Pipe MJ Adapters are manufactured in standard IPS and DIPS sizes for connecting IPSsized or DIPS-sized polyethylene pipe to mechanical joint pipe, fittings and appurtenances that meet AWWA C111/ANSI A21.11. Performance Pipe MJ Adapters seal against leakage and restrain against pullout. No additional external clamps or tie rod devices are required.
Performance Pipe MJ Adapters can be provided as:
1. A complete kit including the MJ adapter, stainless steel stiffener (optional), extended t-bolts and nuts, gland and gasket.
2. MJ adapter only, stainless steel stiffener is optional.
Please refer to Performance Pipe Bulletins PP 2.1 and PP 2.2 for product information.
Installation
Alignment
When fitting up, Performance Pipe MJ Adapters must be aligned straight into the mating hub before tightening the gland bolts. Do not draw the MJ Adapter into alignment by tightening the gland bolts. When fitted-up with hand-tight gland bolt nuts, the gap between the socket hub flange and gland bolt flange should be the same all around the joint. The difference between the widest gap and the narrowest gap should not be more than 3/16″ (5 mm). (The actual gap measurement can be 1″ (25 mm) or more.)
Because polyethylene pipe is flexible, it is not necessary to allow for angular misalignment at MJ Adapter connections. Unlike rigid metal or plastic pipes, flexible polyethylene pipe may be cold bent in the field to a minimum bend radius of 100 times the pipe OD when a fitting, such as an MJ Adapter is present in the bend. Where the PE pipe is protected against bending stress at the joint, a cold bending radius as low as 25 times pipe OD is permissible for Class 160 PE pipe. Please see the Performance Pipe Engineering Manual for information on protecting against bending stresses at joints and cold bending radius.
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