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KLINGER Sentry Gaskets

Reverse integrity gaskets


Pressurized systems are tested for various reasons:

Code compliance during fabrication and installation

» Mechanical integrity of welds and components i.e. flanges, fittings, valves, etc.
» Hydrostatic test - typically water @ 1.5 x Design P
» Pneumatic test - typically air or nitrogen @ 1.1 x Design P

Service/leak test before commissioning and start-up

» Confirms that the entire pressure envelope is leak tight, before introducing process media
» Common test media is air or nitrogen @ % of PSV setting
» Could also be performed with process media

Leakage testing on a newly erected or amended pipeline is traditionally carried out by filling the pipeline with pressurized water or gas to monitor any changes in pressure which indicates a defective joint. The process is carried out in sections by blanking off an area of a pipeline using shutoff valves or blinds.

Depending on the valve location, it may be a large section of pipeline that must be pressurized to test a single flange connection and, in some cases, it is not practicable to leak test all of the joints. Leak testing large portions of pipeline is a time consuming process, increasing production downtime and consequently induces economic loss.

The KLINGER Sentry Reverse Integrity Gasket allows leak testing on individual flanged joints without the need to pressurize the full system.

» Allows leak testing on individual flanged joints without the need to pressurize the full system.
» Leak test both the primary and secondary sides of the seal
» Speeds up the leakage testing reducing plant downtime
» Significantly reduces the volume of testing media required
» Validates individual joint integrity at installation reducing the need to re-visit the joint
» Joints can be tested and adjusted if leakage occurs, in one visit to the flange.
Sentry Gasket

KLINGER Sentry Reverse Integrity Gaskets are designed so leakage testing can be carried out on individual gasketed connections to determine if tightness has been achieved before introducing internal pressure and also allows monitoring of the joint throughout its lifespan.

The Sentry can be used in both ring joint and raised face flanges. 

Sentry RTJ gaskets are heavy duty, high-pressure gaskets largely used in offshore petrochemical applications.

The Sentry DS is an IBC dual-seal Maxiprofile composite gasket designed for use in standard raised face flanges.

KLINGER Sentry Applications:

» In piping systems where the cost of redoing pressure tests, as a result of leaking gasketed joints, is prohibitive or unpalatable
» In piping systems where traditional service testing is not possible, or practical
» In critical piping systems containing lethal, flammable, or toxic process media (e.g. Cat M service), where any amount of leakage is intolerable
» In flanged joints where blinds/ spades are removed, and subsequent joint leak testing is not (or cannot be performed)
» In any flanged joint integrity management practices dictate that evidence be provided of the leak-free nature of the joint