Insulating sets comprise of a gasket, located between the flange sealing faces, one insulating sleeve per bolt, two insulating washers per bolt for maximum protection, and two plated mild steel or stainless steel washers per bolt.

Insulating sets are essentially used for flange corrosion protection, where a seal is required between dissimilar flange materials in contact with an electrolyte, in order to prevent the set up of a galvanic cell which would corrode the anodic metal. Insulating sets are also used to electrically isolate flange joints, preventing the flow of electrostatic charge along pipelines.

Style NCA

Full Face Gasket
Insulating Set Assembly
Suitable for flat face and raised face flanges. This style minimizes the ingress of conductive foreign matter between the portion of the flanges outside the raised faces and reduces the risk of bridging.

Style NCB

Inside Bolt Location
Gasket Insulating Set Assembly
Utilizes a central gasket which locates within the bolts.

Style NCC

Ring Joint Gasket
Insulating Set Assembly
Insulating oval section ring joint will fit into a standard RTJ flange ring groove.

With style NCA and NCB insulating sets it is imperative that the bore of the gasket is equal to that of the pipe. This will prevent any foreign matter from accumulating in the annular space between the bore of the gasket and the bore of the pipe, thus preventing bridging.

The gasket material is typically neoprene-coated grade G-10 Glass-Reinforced Epoxy for service temperature up to 110°C. Phenolic laminate provides excellent insulating properties as well as corrosion resistance, and it is also used for the bolt sleeves and washers. For higher service temperature, other gasket materials such as PTFE, CSF and Thermiculite® are available.

As standard, Euroguarco insulating kits are dimensioned to suit schedule 80 pipe, suitable for use on standard and non-standard flange assemblies, up to ANSI Class 2500.