Installation Guidelines

Personnel responsible for installing and maintaining lined pipes and fittings should be trained on proper handling procedures. Lined piping systems may contain hazardous fluids, thus all safety precautions should be observed when working on such systems.

Flange Protection Covers

These covers protect the flared lining and should not be removed until the flanges are ready to be bolted into position. Upon removal of the protection covers, great care must be observed not to damage the flare surface during handling. Clean joint surfaces prior to installation.

Hot Work

No hot work such as welding, flame cutting, brazing, etc. should be done on or close to metal pipes where the heat generated would cause damage to the inside liner material.

Thermal Cycling

Retorque after the first cycling process and after the system has cooled down to ambient temperature. Do not removed lined pipes, fittings and valve which are above ambient temperature.

Vent Holes

Vents relieve pressure between the liner and pipe wall and also serve to indicate leaks. Ensure that vents are not clogged up. On insulated pipes, vents should be extended through and out of the insulation using the optional Vent Boss Fitment. Vents should be periodically inspected. Do not use sharp objects to clean clogged vents.


Permeation is the penetration of the fluid molecules through the lining and can be reduced with increased liner thickness and appropriate lining material selection. Permeation will also increase with increase in service temperature.


This is the deformation of PTFE over time under the influence of applied stress and increases at elevated temperatures.

Low Temperature Service & Storage

Cold temperatures can cause brittleness in PP and PVDF lined components. Heat tracing is recommended in freezing operating conditions.