JCM Industries, Inc. / P. O. Box 1220 / Nash, TX 75569-1220
JCM 630 Fitting and 631 A/C Coupling
Asbestos Cement Pipe Restrainers
Installation Instructions
1. Thoroughly clean pipe surface. Remove any large obstructions which might interfere with
the seating of the restrainer body. Check the size and range of the pipe to the size and range
of the restrainer to verify correct size of product.
2. Position top half of restrainer on pipe the appropriate distance from the fitting/coupling to
engage the restraining bolts/all-thread rods. Make certain the hollow side of the restrainer
ears face toward the fitting/coupling. Align the restrainer ears (or anchor loops) with fitting
bolt pattern, or if 631 over coupling, align restrainer ears of both halves. See drawing on
reverse.
3. Position the bottom half of the restrainer and install clamping bolts.
4. Tighten clamping bolts evenly. Alternate from one side of restrainer to the other. Tighten
bolts to the following torque levels:
4” - 12” Nominal Pipe Sizes
100 ft. lbs. of torque
14” - 16” nominal Pipe Sizes
125 ft. lbs. of torque
Field Installation Note:
The torque values listed are manufacturer’s suggested levels. It is
necessary for field technicians to assess the pipe’s condition and integrity to determine if
pipe will accommodate these torque levels. Should the assessment find pipe fragile, brittle
or weakened, adjust torque levels accordingly.
5. For 631 A/C Coupling Restrainer, assemble other half of restrainer unit on the opposite side
of the coupling with same procedures 1 - 4.
6. Insert restrainer bolts/all-thread rod to fitting/over coupling. Place a washer and nut on
end(s) of each bolt or rod and hand tighten. The tighten each nut one full turn.
7. If applicable, install second nut on restrainer bolts or rods to lock nut in place.
INT630-1101
