LineSeal™ Xtreme Critical Sealing/Isolating Gaskets Description Benefits/Features Specifications Warranty Installation How to Order Resources Related Products Description LineSeal™ Xtreme Critical Service Gaskets are designed to withstand severe corrosive environments, including high concentrations of CO2, H2S, produced water and aggressive inhibitors even at elevated or fluctuating temperatures. The center of the gasket consists of a high integrity 316 stainless steel core for high hoop strength while a layer of G-10 reinforced laminate is applied to each side to serve as the dielectric sealing material. Pressure activated seals, with a stainless steel spring, provides elastic memory for polymers not normally associated with this characteristic - resulting in a simple flat gasket with extremely high loading and self energizing characteristics without adverse cold flow problems. Before Tightening The flange faces have come into contact with the sealing elements, which extend slightly above the surface of the retainer. As the flange is tightened, the sealing elements are compressed into the machine groove - developing an initial high unit pressure against the flange faces. After Tightening The flange faces come into firm contact with the retainer, thus compacting the sealing elements within grooves. At the same time, the unique LineSeal™ spring energized seal provides elastic memory for polymers not normally associated with this characteristic - resulting in a simple flat gasket with extremely high loading and self energizing characteristics without adverse cold flow problems. 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 Extreme, high reliability sealing and electrical isolation solution for critical service applications. Seals and isolates all pressure ratings through ANSI 2500 class and API 15,000 psi service. Withstands severe service conditions including vibration, temperature and pressure fluctuations. Designed to withstand corrosive environments, including high concentrations of CO2, H2S, produced water and aggressive inhibitors. Good electrical isolation properties for cathodic protection. Pressure-activated seals provide high confidence sealing, eliminates costly leaks and provides a solution for fugitive emissions. Gasket is sized to the bore to protect flange faces from media-induced corrosion and flow-induced erosion. Prevents turbulent flow at flanged connections. Mitigates galvanic corrosion in dissimilar metals flanges. High strength laminate material resists failure due to excess compression. Available to match any flange specification (ANSI, ASME, API, MSS, BS, DIN, AS, and others). Can mate mismatched RTJ with raised-face flanges. Easy installation, make-up and removal: Sealing system is not sensitive to low bolt loads - providing reliable sealing through a range of bolt stress. Gasket is self-aligning and centering - quick to install and no special tools are required. Maintenance-free corrosion-resistant design is resistant to deforming under load. Works in ring joint flanges, reducing fluid entrapment, flow induced erosion and media induced corrosion between flanges. 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. 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. 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. Suggested torque values for PSI sealing gaskets. How To Order To order LineSeal™ Sealing/Isolating Gaskets please indicate the following: Quantity Nominal Pipe Size Pressure Rating Gasket Type: E or F Gasket Style: LineSeal™ 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 All Critical Service Applications Materials for sealing gaskets on pipes containing water, aqueous fluids, oil, sour or natural gas (up to 302ºF, 150ºC) shall consist of the following components: Isolation and Sealing Gasket One isolating and sealing gasket, LineSeal Type “F”, 0.27” thick, 316 stainless steel core retainer laminated on both sides with a G-10 fiber glass reinforced laminate containing a precision tapered groove to accommodate the controlled compression of a PTFE(Teflon) spring energized seal. Sealing element placement shall accommodate either flat, raised or RTJ face flanges. The spring energized seal shall be pressure energized. The G-10 retainer shall have a 800 volts/mil dielectric strength and a minimum 69,000 psi compressive strength. The I.D. of the flange isolating gasket shall match the bore of the flange in which it is installed. Quality Gaskets shall be manufactured at a facility that has a registered ISO 9001:2008 Quality Management System. Submittals shall include copy of valid registration. Performance suitability and material compatibility shall be determined by the user. 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 Resources LineSeal™ Xtreme Critical Sealing/Isolating Gaskets An 8 page booklet that includes all specifications, material compatibility charts and features. File Size = 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. Flange Isolation Kits. A 12 page booklet that includes descriptions of all PSI flange isolation kits with gasket, sleeve and washer physical properties and material compatibility charts. PDF File Size = 532KB. Related Products ElectroStop® Isolating Fittings