Experience Counts!   GasketSeal® Sealing (Non-isolating) Gaskets Description Typical Application Benefits/Features Specifications Warranty Installation How to Order Typical Specification Resources Related Products Description 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. 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. 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. 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. 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. TYPE F GASKET The gasket retainer extends out to the I.D. of the bolt circle. Benefits/Features 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. 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. Non-Isolating Gasket Retainer and Seal Element Options Metal Retainer Materials Sealing Elements Aluminum Buna-N (Nitrile) Brass Buna-S Carpenter 20 Butyl Carbon Steel EPDM Cast Iron Hypolon Clad Steel Materials Natural Rubbers Copper Neoprene Ductile Iron Nylon Hastelloy B Polyurethane Hastelloy C Silicone Rubber Hastelloy X Viton® Inconel X   Monel   Nickel 200   Soft Iron   Stainless Steel   Tantalum   Tin   Titanium   Vanadium   ®DuPont Warranty 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. Installation 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. Insert studs, nuts and washers, placing lubricated face of nut next to steel washer (this will help to reduce galling of the insulating washer on flange, should the whole bolt assembly rotate). Galling: If serious galling of insulating washers persists, replace with high strength washers. (minimum 50K psi or greater). 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° degrees 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. 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 and tightened 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. Suggested torque values for PSI sealing gaskets. How To Order To order LineBacker® Sealing Gaskets please indicate the following: Quantity Nominal Pipe Size Pressure Rating Gasket Type: E or F Gasket Style: LineBacker® Retainer Material Sealing Element Weld neck or slip-on application Note all special requirements. Contact your local distributor or Pipeline Seal & Insulator, Inc. Distributor Locator Contact PSI Typical Specification Resources Sealing Gaskets A 12 page booklet that includes all PSI Sealing Gaskets including specifications, material compatibility charts and features. PDF File Size = 1,057KB. Flange Isolation Kits. A 12 page booklet that includes all PSI flange isolation kits. PDF File Size = 532KB. Related Products LineBacker® Sealing Gaskets (Non-isolating) FlangeMate® Sealing Gaskets (Non-isolating)