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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Gasket Factors "M" and "Y" | | | | | | | | | | M = (W - A2P)/A1P Where: W = Total Fastener force (Ib. or N) A2 = Inside area of gasket (in.2 or mm2) P = Test pressure (psig or N/mm2) A1 = Gasket area (in.2 or mm2) "Y" - Minimum Design Seating Stress The minimum compressive stress in pounds per square inch (or bar) on the contact area of the gasket that is required to provide a seal at an internal pressure of 2 psig (0.14 bar). Y = W / A1 | | | | | | "M" and "Y" data are to be used for flange designs only as specified in the ASME Boiler and Pressure vessel Code Division 1, Section VIII, Appendix 2. They are not meant to be used as gasket seating stress values in actual service. Our bolt torque tables give that information and should be used as such. "M" - Maintenance Factor A factor that provides the additional preload needed in the flange fasteners to maintain the compressive load on a gasket after internal pressure is applied to a joint. | | | | | | | | | | | | | | | | | | | | | | | Gasket | Min. Design | | | | Gasket Material | Factor | Seating Stress | | | | | "M" | "Y" (psi) | | | | Stainless steel or MONEL® | 3.00 | 10,000 | | | | Stainless steel or MONEL® | 3.00 | 7,500 | | | | Stainless steel or MONEL® | 2.00 | 5,000 | | | | Stainless steel and | 2.00 (1/16") | 2,000 (1/16") | | | | flexible graphite | 9.00 (1/8") | 3,000 (1/8") | | | | Liquid service: | 2.00 | 900 | | | | Soft aluminum | 2.50 | 2,900 | | | | Soft copper or brass | 2.75 | 3,700 | | | | Iron or soft steel | 3.00 | 4,500 | | | | MONEL® or 4%-6% chrome | 3.25 | 5,500 | | | | Stainless steel | 3.50 | 6,500 | | | | Soft aluminum | 2.75 | 3,700 | | | | Soft copper or brass | 3.00 | 4,500 | | | | Iron or soft steel | 3.25 | 5,500 | | | | MONEL® or 4%-6% chrome | 3.50 | 6,500 | | | | Stainless steel | 3.75 | 7,600 | | | | Soft aluminum | 3.25 | 5,500 | | | | Soft copper or brass | 3.50 | 6,500 | | | | Iron or soft steel | 3.75 | 7,600 | | | | MONEL® | 3.50 | 8,000 | | | | 4%-6% chrome | 3.75 | 9,000 | | | | Stainless steel | 3.75 | 9,000 | | | | Soft aluminum | 3.25 | 5,500 | | | | Soft copper or brass | 3.50 | 6,500 | | | | Iron or soft steel | 3.75 | 7,600 | | | | MONEL® or 4%-6% chrome | 3.75 | 9,000 | | | | Stainless steel | 4.25 | 10,100 | | | | Soft aluminum | 4.00 | 8,800 | | | | Soft copper or brass | 4.75 | 13,000 | | | | Iron or soft steel | 5.50 | 18,000 | | | | MONEL® or 4%-6% chrome | 6.00 | 21,800 | | | | Stainless steel | 6.50 | 26,000 | | | | Iron or soft steel | 5.50 | 18,000 | | | | MONEL® or 4%-6% chrome | 6.00 | 21,800 | | | | Stainless steel | 6.50 | 26,000 | | | | | | | | | | | | | | Gasket Design | | | | | | | | | | Spiral wound metal, non-asbestos filled | | | | | | | | | | Garlock CONTROLLED DENSITY® flexible graphite-filled spiral wound | | | | | | | | | | Garlock EDGE® | | | | | | | | | | Garlock GRAPHONIC® | | | | | | | | | | Corrugated metal, non-asbestos or Corrugated metal-jacketed, non-asbestos filled | | | | | | | | | | Corrugated metal | | | | | | | | | | Flat metal-jacketed, non-asbestos filled | | | | | | | | | | Grooved metal | | | | | | | | | | Solid flat metal | | | | | | | | | | Ring joint | | | | | | | | | | | | | | MONEL® is a registered trademark of International Nickel. | | | | | | This table lists many commonly used gasket materials and contact facings with suggested design values of "M" and "Y" that generally have proven satisfactory in actual service when using effective gasket seating width B1 described in the formula on page D-32. The design values and other details given in this table are suggested only and are not mandatory. | | | | | | | | | | | | | | D-33 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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