Presentation of the installation of a JCM 114 Bell Repair Sleeve over a leaking Asbestos Cement Coupling.
JCM 114-2885-2853- BR ESS JCM 114 Mechanical Joint Bell Repair Sleeve 24” Asbestos Cement Pipe – Leaking A/C Coupling
City of Henderson, North Carolina – 24” Asbestos Cement Pipe, leaking A/C coupling/pipe joint. A Previous leaking A/C coupling was repaired by taking the line out of service, cutting out the coupling and installing a replacement section of pipe. Taking the line out of service was an inconvenience to the system users and required time to drain the line. Using the JCM 114 Mechanical Joint Bell Repair Sleeve reduced labor time to about 4 hours, kept the line in service and will last the life of the pipeline. The Asbestos Cement Pipe presented some issues with irregular diameters around the coupling. These issues were overcome by custom fabrication of the 114 to fit the measured pipe diameters.
Repair site located in Henderson, North Carolina
Problem Leaking Asbestos Cement Coupling Line Content: Potable Water Pressure: 150 PSI
A/C Coupling OD: 33.14” A/C Coupling Length: 10-1/8”
A/C Spigot OD – diameter varies in repair area:
Minimum: 28.53” Maximum: 28.85”
At right – a simple hand drawing of the leaking coupling and the measured dimensions of the pipe around the coupling. These dimensions were used to fabricate the repair fitting – giving it a custom fit.
Problem Leaking Asbestos Cement Coupling Line Content: Potable Water Pressure: 150 PSI
A/C Coupling OD: 33.14” A/C Coupling Length: 10-1/8”
A/C Spigot OD – diameter varies in repair area:
Minimum: 28.53” Maximum: 28.85”
Repair Site excavated, A/C coupling exposed.
24” Asbestos Cement Pipe – Leaking Coupling
This 114 weighs approximately 1,000 pounds
Delivery of JCM 114 Bell Repair Sleeve
Field Crew confirms bell and pipe spigot dimensions and removes any debris
Unloading the 114 Sleeve
Note the white paint dot on the bolting “lug bar.” This is one of the marks used during installation to ensure the two halves of the sleeve are reassembled in the proper position. Note the four flange studs installed prior to shipping. These studs were used to assemble the fitting for shipment and ensure all components arrived to the job site.
Sleeve is unpackaged ready for installation
Lifting backside of sleeve into the installation area
Moving backside of sleeve under the pipe coupling
Repair fittings perform at their maximum when centered over the repair/damaged area.
Positioning sleeve center over the A/C coupling
Note the A/C coupling is encapsulated inside the “barrel” of the repair fitting and the ends of the fitting transition to fit the diameter of the pipe spigot.
Backside in place under A/C coupling
Installation continues
Top half of fitting is introduced. Note the white mark on the side of the top half – this aligns to the white dot on the back/bottom half.
Note that the hardware for the fitting has been packaged separately from the fitting. This fitting was provided epoxy coated with stainless steel hardware (for corrosion resistance). Stainless steel hardware should be handled carefully to protect the threads from damage and any dirt/debris from entering the threads of bolts/nuts. Keeping hardware clean and lubricated
will ensure the proper tightening of the bolts.
Side bolt hardware is installed
Stainless steel MJ studs installed in the body flange
Note the bottle of dish soap – lubricating the pipe and the gaskets with soapy water aids the fitting and gasket in “sliding” into place. Soapy water will dissipate after the installation is finished and let the gasket “adhere” to the pipe surface to create the water tight seal. The lap joint of the gasket should be rotated 45 o (1/8 turn) from the body and pusher gland splits.
Installation of the MJ gasket
Note that when installing the mechanical joint follower rings, the joint of the two rings should be rotated about 90 o degrees (1/4 turn) from the sleeve joint – this ensure that the gasket will be compressed fully and prevent a “channel” where a leak may occur.
Installation of the MJ follower flanges
Note “doubler plates” furnished with the fitting are installed on the outside of the follower rings over the joint area of the two ring halves. These doubler plates reinforce the follower ring joint area and assist in providing gasket compression into the MJ cavity.
MJ doubler plates and stainless steel nuts installed
Completed Installation
Great appreciation to Ron Collins, President of JCM Industries for the images and information provided.
Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22Powered by FlippingBook