Category Archives: gasketing

Isolation Gasket Solutions from Thermoseal

KLINGERSIL® C-7400 Isolation Gaskets

Application Overview:

Some applications in plants call out for isolation kits to maintain the integrity and reliability of a pipeline and piping system. Isolation kits are designed to work in conjunction with flanges, gaskets, and/or bolt sleeves and washers by eliminating metal-to-metal contact and halting static electric currents. At times they are relied upon for critical applications in severe temperatures and conditions.

KLINGERSIL C-7400 - Isolation Gaskets replace Isolation Kits

The Problem: 

Industry’s first choice are phenolic gaskets. They are often supplied in kits, but they are hard and typically take a lot of load to seal. And lack of load is the number one reason for gasket failure.

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Ring-Type vs. Full-Face Gaskets

When sealing raised or flat face flanges, there are two choices of gasket shape: ring-type or full-face.  Each has its own advantages, so you should know which will best suit your application before ordering and installing. First, let’s discuss the types of flanges in which gaskets are installed.

Flange Faces

Different types of flange faces are used as the contact surface to seat the sealing gasket materials.  ASME B16.5 and B16.47 define various types of flange facings, including the raised face, the large male and female facings which have identical dimensions to provide a relatively large contact area.

Raised Face (RF) Flanges

Raised Face FlangesThe Raised Face flange is the most common type used in process plant applications, and is easily to identify. It is referred to as a raised face because the gasket surfaces are raised above the bolting circle face. This face type allows the use of a wide combination of gasket designs, including flat ring sheet types and metallic composites such as spiral wound and double jacketed types.

The purpose of a RF flange is to concentrate more pressure on a smaller gasket area and thereby increase the pressure containment capability of the joint. Diameter and height are in ASME B16.5 defined, by pressure class and diameter. Pressure rating of the flange determines the height of the raised face.

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Gasket Installation Procedures: Best Practices

Brought to you by Thermoseal®

Gasket InstallationThis blog provides guidance to maintenance operators, engineers and fitters to ensure successful gasket installation and assembly of bolted flange connections. However always check plant-approved installation procedures first.

The successful operation of a gasket depends upon a multiplicity of factors including the style and quality of the gasket material, but also the medium being sealed, the flange design, the amount of pressure applied to the gasket by the bolts and how the gasket is assembled onto the flanges and tightened. Very basic causes often lead to leakage in bolted joints, and in most cases, it is not just the gasket but also the human element. Users should evaluate all conditions to validate the products are suitable for the intended process.

Tools Needed

Specific tools are required for cleaning the flange and tensioning the bolts. Always use standard safety equipment and follow good safety practices. The following tools are required for removal of the old gasket and installation of the new gasket:

  • Calibrated torque wrench or hydraulic tensioner
  • Brass wire brush
  • Personal safety equipment
  • Lubricants for the bolts (if specified)
  • Other plant-specified equipment

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VIDEO: Sealing Flanges with Surface Deviations

Surface Deviations - Pitted FlangeOver time, and for any number of reasons, flanges are prone to surface deviations.  Damaged areas will tend to create a leak path that the gasket must try to seal.

Flange damage most commonly occurs when removing previously used gasket material from the sealing surface – tools such as chisels, or screw drivers, should be avoided. A brass wire brush is suggested.

The video below proves how well GORE® Gasket Tape Series 500 works on flanges with surface deviations versus a standard filled PTFE gasket.

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Improper Gasketed Joints Can Be Deadly

Gasket FabricationGallagher Fluid Seals is the trusted supplier of MRO sealing materials – including gasketing, packing, expansion joints, etc. – to all kinds of plants and manufacturers throughout the northeast and mid-Atlantic.  At Gallagher, we take the time to specify the right gasket for every application, and we do our best to keep our customers well-informed about industry best practices and sealing safety.

The following is an article recently published in Pumps & Systems Magazine, which discusses why you should NEVER reuse a gasket.


Sealing Sense

by Jim Drago & Ron Frisard

Safety is a concern at any industrial site. An Occupational Safety and Health Administration compliance specialist has stated that safety should be more than a priority: “Priorities in an organization can and usually do change. Safety and health need to be a core value of the organization.”1

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Why Use Food Grade Silicone?

There are a plethora of choices when it comes to gasketing material.  But if you are in the food processing, it is crucial that every item that makes contact with the gasket is left unaffected.  And although silicone is inherently non-toxic, only a specially formulated food grade silicone is fit for use with consumables.

Food Grade Silicone - FDA ApprovedSilicone is an ideal elastomer to use if you require FDA-approved rubber.  Since there is an emphasis on rubbers being suitable for repeated use in the food processing industry, silicone is ideal being that the material is not susceptible to harmful microbial agents or other contaminants.  Food grade gaskets and seals should be able to function for long periods of time without falling prey to harmful contamination, or degradation.

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VIDEO: Installing GORE® Gasket Tape Series 500

A spool of GORE® Gasket Tape Series 500 provides an immediate, cost-effective solution to sealing challenges that demand reliable performance and extended durability. This advanced product, with Gasket Tape Series 500its industry-leading creep resistance, is designed to maximize the operational reliability of large steel-flanged applications, especially those with thermal cycling.

It eliminates the lag time, costs and complexities associated with engineering, specifying, procuring, shipping, storing and installing traditional one-piece prefabricated gaskets.  It also delivers exceptionally reliable sealing performance, while making multiple gasketing installations faster, more cost-effective and simpler.

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How To Choose The Right Semi-Metallic Gasket

semi-metallic gasketThere are many variations of semi-metallic gasket available in today’s market.  The combination of metal and a soft gasket material merges the sealing ability of the soft material with the structural integrity of the metal.

The most common styles of semi-metallic gasket include spiral wound gaskets, corrugated, jacketed, and kammprofile gaskets.

Pumps & Systems magazine outlined the proper way to select a semi-metallic gasket. Read on to learn more:

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When to Use Segmented Gaskets

segmented gasketsThere are a number of situations where your product or process may require segmented gaskets.  Because of how sheets of gasket material are manufactured, some pieces of machinery are too big to utilize a single-piece gasket.

But you can also use segmented gaskets to get better yield from a sheet of gasketing material, minimizing the waste generated with centers.

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GORE® Gasket Tape Gets an Upgrade

GORE® Gasket Tape is a 100% ePTFE form-in-place gasket that delivers worry-free sealing performance for large steel flanges (Series 500) and large glass-lined steel equipment (Series 1000). While this product has a number of advantages, GORE® has now made their gasket tape line even easier to use.


Improved installation-aid adhesive.

GORE® Gasket Tape - New Backer vs. Old BackerGORE® has upgraded the removable adhesive backer on GORE® Gasket Tape Series 500 and Series 1000 to a new higher strength material. This ensures that when the backer is removed at installation, it peels away in one easy-to-remove piece.

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