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GasketSeal® Sealing/Isolating Gaskets
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GasketSeal sealing gaskets are
considered to be one of the most
effective methods for sealing
mating surfaces of all types. The
gasket consists of two molded half
“O” rings (with precise crown to
void ratio) mounted in grooves on
opposite sides of a retainer.
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While maintaining
all the advantages of a full “O” ring seal, the half
“O” rings eliminate the need for sealing grooves in the
mating surfaces which also eliminates positioning and alignment concerns.
GasketSeal gaskets are available in a wide variety of retainer and sealing
element combinations for matching gaskets to service and environmental conditions.
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Before Tightening
The flange faces come into contact with the crown of the sealing elements. As the flange is tightened the crowns are
compressed into the molded-in voids in the sealing elements, resulting in a seal that will maintain positive, dynamic
contact against the flange faces under all conditions.
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After Tightening
The flange faces have come into firm contact with the retainer, thus encapsulating the sealing elements within grooves
and guarding them from exposure to external environments or internal media. At the same time, the elastic memory characteristics
of the confined sealing elements results in zero “m” and “y” factors, making it possible to effect and maintain a positive seal
at the lowest possible compressive load.
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TYPE E GASKET
The gasket retainer extends out to the O.D. of the flange. Holes are cut in a type "E" gasket at the bolt circle to accommodate
threaded studs or bolts.
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TYPE F GASKET
The gasket retainer extends out to the I.D. of the bolt circle.
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- Eliminates Flange Leaks.
- Guards against blowouts.
- Protects against fire and hostile environments.
- Usable with any type of flange.
- Matches gasket materials to service conditions.
- Lowest possible clamp and compressive load.
- Increases gasket life.
- Insulating version is both a positive seal and a superior insulator.
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Sizes
- All standard ANSI and API flange sizes from 1/2" and above.
- Custom odd sizes and shapes.
Pressure Ratings
- All ANSI and API rated flanges.
- Pressures from hard vacuum to 50,000 psi and higher.
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Isolating Gasket Retainer and Seal Element Options |
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| Isolating
Retainer
Materials |
| Sealing
Elements | |
Ceramic | Buna-N (Nitrile) |
Epoxy Glass | Buna-S |
Glass | Butyl |
Lucite | EPDM |
Melamine | Hypolon |
Phenolic | Natural Rubbers |
Polyester Glass | Neoprene |
Polyethylene | Nylon |
Silicone Glass | Polyurethane |
Vinyl | Silicone Rubber |
| Viton® |
®DuPont
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Gasket Material Compatibility Chart |
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All products are warranted against failure caused by manufacturing defects for a period of one year. Any product found to be
so defective and returned within one year from date of shipment will be replaced without charge. The above warranty is made in
lieu of, and we disclaim, any and all other warranties, | |
expressed or implied, including the warranties of merchantability and
fitness for a particular purpose, and buyer agrees to accept the products without any such warranties. We hereby disclaim any
obligation or liability for consequential damages, labor costs or any other claims or liabilities of any kind whatsoever. |
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- Open packaging to inspect and determine that components are as specified. Check the gasket I.D.
It should be no greater than the flange I.D.
- Flanges shall be free of pits, gouges, rust, debris, oil and grease. Surface finish shall be no greater
than 250 RMS. Refinish flange faces if corrective measures do not meet the foregoing. Check flange and bolt hole
spot facings for burrs, etc… and clear from facings.
- Check bolts and nuts and clean. Apply non-conductive lubricant to all threads and flange side of nuts.
- Align flanges so they are concentric and parallel and install gasket carefully. USE NO LUBRICANT, GREASE OR
ADHESIVES ON EITHER THE GASKET OR FLANGE FACES, Guard against damaging sealing element.
- Line up bolt holes with non-tapered drift pins using three at 120° degrees separation (particularly large flanges),
or at least two at 180° degrees separation.
- Install studs,nuts and washers.
- Initially cross-tighten bolts until flange to gasket contact has been made.
- Check for a flange segment that may show a gap or separation between gasket and flanges, using flashlight,
calipers, or feeler gauge. If one exists, the flanges are not parallel.
- Directly 180° opposite widest part of indicated gap, loosen nuts, even if only finger tight, one or more turns.
Return to segment with gap and tighten until both flanges are in contact with gasket retainer. This procedure is necessary
to prevent restriction of flange rotation over the fulcrum formed by the outer edge of the two raised faces at points in
contact with gasket retainer. The restriction will cause exceptionally high flange to gasket clamp loading at this point,
with possible damage to gasket retainer, PLUS diverting necessary clamp loading bolt torque energy to correcting
alignment on the opposite segment.
- Re-tighten loosened nuts and proceed with torqueing of the bolts according to PSI diagram, to 10-15% of specified
torque. Remove drift pins and replace with bolts, nuts and washers, tightened to the same values as others in place.
- Repeat torque sequence, increasing to 50% of balance.
- Repeat tightening to final torque.
- Optional – it is always a good policy to go completely around flange checking bolt to bolt for proper torque, particularly
on large diameter piping systems.
- All the above should be done with torque wrenches (mechanical and hydraulic) or with a stud tension measuring device.
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Always wear appropriate safety equipment!
Important: Check gasket for flange type on which to be used (ie). Slip or weld-neck etc…If in doubt do not install, consult supplier or PSI.
To provide even sealing pressure on a flange gasket it is recommended that the bolts be “snugged” up in the sequence shown on
chart until the flange faces are in contact with the gasket. After the flange faces are in contact with the gasket firmly
tighten the bolts in the same sequence. Note: Although this diagram shows 24 bolts, the same basic procedure should be used
with flanges having more or less bolts. When installing gaskets made of compressible dielectric material, cold;
“hot flow” of the gasket material may occur under operating conditions, resulting in loss of bolt pressure. It is advisable
therefore, to re-tighten bolts after operating temperature has been reached – preferably at zero line pressure and ambient
temperature. Under no circumstances should the system be allowed to return to operating
temperature after the initial cycling to ambient temperature without checking and re-tightening bolts where needed.
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Suggested torque values for PSI sealing gaskets.
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To order GasketSeal® Sealing/Isolating Gaskets please indicate the following:
- Quantity
- Nominal Pipe Size
- Pressure Rating
- Gasket Type: E or F
- Gasket Style: GasketSeal®
- Retainer Material
- Sealing Element
- Weld neck or slip-on application
- Note all special requirements.
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Contact your local distributor or Pipeline Seal & Insulator, Inc.
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Distributor Locator
Contact PSI
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General/Economical
Materials for sealing gaskets on pipes containing water, aqueous fluids or natural gas (up to 221ºF, 105ºC) shall consist
of the following components:
Isolating and Sealing Gasket
One full faced isolating and sealing gasket, GasketSeal® Type “E”, 1/8” thick, phenolic retainer containing
a precision tapered groove to accommodate the controlled compression of a nitrile sealing element.
Sealing element placement shall accommodate either flat, raised or RTJ face flanges. The seal shall be
pressure energized. The phenolic retainer shall have a 500 volts/mil dielectric strength and a minimum 25,000
psi compressive strength. The full faced flange isolating gasket shall be 1/8” less in I.D. than the I.D. of
the flange in which it is installed.
Quality
Gaskets shall be
manufactured at a facility that has a registered ISO 9001:2000 Quality Management System. Submittals shall
include copy of valid registration.
Availability
Gaskets shall
be manufactured by Pipeline Seal and Insulator, Inc., Houston, Texas, U.S.A., Telephone: 713-747-6948,
Facsimile: 713-747-6029, www.pipelineseal.com. e-mail: info@psipsi.com
Performance suitability and material compatibility shall be determined by the user.
Typical Specification for General/Economical Applications in PDF Format
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Top of the Line
Materials for sealing gaskets on pipes containing natural gas,
oil and aqueous fluids (up to 280ºF, 138ºC) shall consist of the following components:
Isolating and Sealing Gasket
One full faced isolating and sealing gasket, GasketSeal® Type “E”, 1/8” thick,
G-10 retainer containing a groove to accommodate the controlled compression of a molded Viton
sealing element. Sealing element placement shall accommodate either flat, raised face or RTJ flanges. The seal element
seal shall be pressure energized. The G-10 retainer shall have a 550 volts/mil dielectric strength and a minimum
50,000 psi compressive strength. The full faced flange isolating gasket shall be 1/8” less in I.D. than the I.D.
of the flange in which it is installed.
Quality
Gaskets shall be
manufactured at a facility that has a registered ISO 9001:2000 Quality Management System. Submittals shall include
copy of valid registration.
Availability
Gaskets shall be manufactured
by Pipeline Seal and Insulator, Inc., Houston, Texas, U.S.A., Telephone: 713-747-6948, Facsimile: 713-747-6029,
www.pipelineseal.com. e-mail: info@psipsi.com
Performance suitability and material compatibility shall be determined by the user.
Typical Specification for Top-of-the-Line Applications in PDF Format
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Sealing Gaskets
A concise 12 page booklet that includes all PSI Sealing Gaskets including specifications, material compatibility charts and
features.
PDF File Size = 1,057KB.
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Flange Isolation Kits.
An 12 page booklet that includes discriptions of all PSI flange isolation kits with gasket, sleeve and washer physical properties and
material compatibility charts.
PDF File Size = 532KB. |
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LineSeal™ Sealing Gaskets
An 8 page booklet that includes specifications, material compatibility charts and
features for the Xtreme Critical Sealing Line-Seal™ Sealing Gaskets.
PDF File Size = 601KB.
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