Expansion joints installed in piping systemsmust be anchored on both sides of thejoints to avoid the use of control rods. If

control rods are installed as a safety measure, the locking nuts must be backed off with a clearance equal to the specified
axial movement. The expansion joint will exert thrust on the anchors. To calculate thrust, use the following equation:
Thrust = (Thrust Area Large End ID) x(Rated Working Pressure) EXAMPLE—For a 12” x 10” FCR/FER500, the Thrust
Area 133 in
2 multiplied by the RatedWorking Pressure 140 psi equals the Thrust 18,620 lbs.133 x 140 = 18,620 lbs.
Expansion joints installed in unanchored piping or connected to isolated equipment must have control rods. once control rods are installed the joint will no longer act as an expansion joint, since the pressure will force the joint against the control rod stops.
It will allow for misalignment, transverse and possibly angular motion. The nuts of the control rods should be threaded tight to
control rod gussets at the published length.Initial misalignment should be kept to a maximum of 1/8".
Expansion joint flanges must be in contact with a flat surface, or a maximum 1/16" standard raised face. Depressions or
protrusions typical of vitaulic or similar type flanges must be covered with a steel spacer flange first. Rubber flanges will not
retain loose elements in valve bodies that rely on contact with a steel flange. In these applications, a steel spacer flange must be
inserted between the rubber expansion joint and the valve body.

Design  picture of pipe shock aborber,you can choose what you want.

 pipe shock aborber Displacement Diagram

Appreciate the details of pipe shock aborber

Hight quality pipe shock aborberBuried Protective Device

The flexible rubber joint buried protective device developed by our company is designed with enough space around and has no influence on rubber joints displacement performance and can separate rubber joint from exterior earth layers and keep pipes freely moving at device ends without resistance. After installing pipes lines, the backfilled ground will be leveled off as usual, on which, vehicles can run well, heavy materials are placed or equipment be installed.

Special attention: please provide buried depth in order so that we can design reasonable protective device for you. Generally the device can be used for over 30 years if anti-erosion on the device surface is well done.   

we product have been use in many named factories and this one is Gangan power plant.

The foreign client Mr. king come to visit in 2009.

Our factory section

You are welcomed to visit:

www.minegrinder.com
www.steel-bellows.com
www.liweipipeline.com