Pre-insulated ISOPAM

The ISOPAM preinsulated pipelines are as easy to lay as the push-in joint ductile cast iron pipes. Consequently, only those operations or precautions specific to ISOPAM are described below.

Laying above ground or bridge crossing

Dimensions of collars and supports

The dimensions of the collars and supports must take into account the outer diameter DR of the polyethylene sleeve. Recommendations:

• plan one support for each pipe (behind each socket),
• respect a minimum collar width w,
• fit a protective rubber pad under the collar to avoid pinching or deforming the polyethylene sleeve.

Trench pipe laying

Pipe laying conditions

Plan a 10 cm thick layer of sand at the bottom of the trench and a rock-free backfill, suitably compacted up to 10 cm above the upper generator.
The rest will be filled with ungraded material and compacted according to applicable rules.

Minimum depth of cover

The minimum depth of cover with traffic loads (10-tonne wheel) is:

• 0.50 m for DN ≤ 300,
• 0.75 m for DN > 300.

Protecting the junction

• Fit the elastomer foam spacer on the spigot,
• Fit the elastomer sleeve on the sheath, socket end, and fold it back over itself.
• Assemble the joint.
• Fold the elastomer sleeve on the sheath, spigot end.

Cutting STANDARD socketed pipes

Marking the cut and the area of insulation to be removed
Allow for the jointing depth and mark the cutting plane.

Area where the insulation will be removed

Draw a line indicating up to where the insulation will be removed, respecting the following dimensions:

Cutting the pipe

Cut off the pipe with the sleeve and the insulation.

Cutting the insulation

Cut the polyethylene sleeve and the insulation (take care not to damage the cast iron).
Remove the insulation and clean the spigot thoroughly.

Restoring the chamfer and applying the coating

Deburr and restore the chamfer to avoid the possibility of damaging the joint gasket during assembly.
Apply the coating on the uncoated spigot and the chamfer.