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Home> Company News> How to Replace the Skin of a Fabric Expansion Joint?
February 16, 2025

How to Replace the Skin of a Fabric Expansion Joint?

The process for replacing the skin of a non-metallic expansion joint mainly includes three main steps: preparation, removal of the old skin, and installation of the new skin. Here is a detailed replacement process:

Preparation

Inspection and Confirmation: Ensure that the outer diameter, skin width, technical parameters, and installation location of the non-metallic expansion joint meet the construction requirements.
Material Preparation: Check whether the skin, pressure plates (if reusable, confirm their quality), bolt assemblies, and other materials to be replaced meet the construction requirements.
Safety Preparation: Check and clear surrounding flammable items, prepare fire extinguishing tools, and ensure fire and electrical safety equipment are in place.

Removal of Old Skin

Removing Bolt Assemblies: Use wrenches and gas cutting equipment to cut off the bolt assemblies securing the old skin of the non-metallic expansion joint.
Storing Materials: Store the removed pressure plates and old skin in designated locations, and mark the sequence for reinstallation of reusable pressure plates.
Inspecting the Framework: Inspect the quality of the metal framework of the non-metallic expansion joint to ensure it is suitable for installing the new skin.

Installation of New Skin

Installing Internal Insulation Cotton: First, install the inner skin cotton and distribute and set insulation pins. Install insulation cotton wrapped with stainless steel wire mesh for the inner layer, then install other layers of insulation cotton and fix them flat with insulation pins.
Installing the Skin: The skin must be flat against the Flange surface of the metal framework (to prevent wrinkles). The skin must be tightened before being pressed down with pressure plates and bolts. The installation of the skin must start from the bottom. Ensure sufficient internal insulation cotton is installed before installing the skin. Unfold it outward from one point at the bottom in sequence to prevent wrinkles. For the skin of an expansion joint in a horizontal flue, the upper joint of the outermost skin should overlap the lower joint to prevent water infiltration at the joint.
Tightening Bolts: All pressure bolts should be tightened with an electric wrench. If an electric wrench cannot be used due to space limitations, ensure that the bolts are tightened in place; no bolts should be left untightened.

By following these steps, the skin of a non-metallic expansion joint can be effectively replaced, ensuring the normal operation and safety of the equipment.

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