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Rubber Faced Phenolic Flange Isolation Kits
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Flange Isolation Kits consist of an isolating gasket and isolating sleeves and washers which are all correctly sized for the
application and conveniently packaged to minimize the possibility of lost component parts during installation. Isolating gaskets
may be specified as either "E" or "F" type while single, |
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double or one-piece sleeve and washer sets are offered as options for
varying degrees of electrical isolation between the flanges. In addition, a wide variety of material options exist for both isolating
gaskets and sleeve and washer materials.
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Rubber faced flat gaskets are used in special applications where PSI LineBacker® or GasketSeal® gaskets may not be suitable.
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Please contact a PSI representative for additional information on available options.
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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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Single Washer Set*
Single washer set flange isolation kits include the following items for each bolt:
- One - 1/8" thick steel washer
- One - Isolating Phenolic Washer
- One - Full Length Isolating Mylar Sleeve
* - For larger diameter flanges or ANSI class over 300#,
we suggest G-10 sleeve & Washer material to be used.
Application Considerations
In buried applications, single washer configurations may be used to allow the Cathodic Protection (CP) current to reach the nuts and bolts.
Install the isolation washer on the side of the flange that is not being protected;
thereby establishing electrical continuity of nuts and bolts with the side receiving cathodic protection. |
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Double Washer Set*
Double washer set flange isolation kits include teh following components for each bolt:
- Two - 1/8" thick steel washers
- Two - Isolating washers
- One - Full length isolating Mylar sleeve
* - For larger diameter flanges or ANSI class over 300#,
we suggest G-10 sleeve & Washer material to be used.
Application Considerations
Double washer configurations may be used for added protection against the possibility of “shorting out” the nuts and bolts. In
addition, double washer sets electrically isolate the nuts and bolts from both flanges.
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One-Piece Sleeve and Washer Sets
One-piece sleeve and washer set flange isolation kits include the following items for each bolt:
- Two - 1/8" thick steel washers
- One-One-piece isolating sleeve
Note: G-10 One-Piece sleeve/washer assembly available for
additional strength and convenience.
Application Considerations
Easier to install, one-piece sleeves also allow the inspector a visual indication of sleeve usage.
Due to the relatively low compressive strength of this material, its use is not recommended for high
pressure or large diameter flanges that require high torque loads.
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- Highest Grade Phenolic for Electrical Isolation.
- Standard Material is 1/8" Thick.
- Custom Order to 1/4" Thick.
- Usable with most types of flanges.
- Nitrile or Neoprene facing available.
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Sizes
- Nitrile Faced - All standard ANSI flange sizes from 1/2" to 48".
- Neoprene Faced - All standard ANSI class to 72" O.D.
- Custom - odd sizes and shapes available on special order.
Pressure Ratings
- All ANSI and API rated flanges.
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Flat gaskets used in special applications such as elevated temperatures often require
materials such as Red Devil or Yellow Jacket. Please contact a PSI representative for additional information on available options.
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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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Natural Gas/Aqueous Fluids
Materials for sealing gaskets on pipes containing aqueous fluids or natural gas [up to 175 degrees F. (79 degrees C.)]
shall consist of the following components:
Isolating and Sealing Gasket
One full faced isolating and sealing gasket, PSI Nitrile Faced Phenolic Type "E", 1/8" thick.
The phenolic 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.
Sleeves and Washers
Full length sleeves shall extend 1/2" into backup steel washers. Washer I.D. and O.D. shall match.
Quality
Gaskets shall be manufactured at a facility that has a registered ISO 9001:2000 Quality Management System. Submittals shall include a copy of valid
registration.
Availability
Gaskets shall be manufactured by Pipeline Seal and Insulator, Inc., Houston, TX 77021 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.
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Water/Wastewater
Materials for flange isolation kits on water and/or sewer lines [up to 175 degrees F. (79 degrees C.)] shall consist of the following components:
Isolating and Sealing Gasket
One full faced isolating and sealing gasket, PSI Neoprene Faced Phenolic, Type "E", 1/8" thick. 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.
Sleeves and Washers
Full length sleeves shall extend 1/2" into backup steel washers. Washer I.D. and O.D. shall match.
Quality
Gaskets shall be manufactured at a facility that has a registered ISO 9001:2000 Quality Management System. Submittals shall include a copy of valid
registration.
Availability
Gaskets shall be manufactured by Pipeline Seal and Insulator, Inc., Houston, TX 77021 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.
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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.
A concise 12 page booklet that includes all PSI flange isolation kits.
PDF File Size = 532KB.
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