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Temperature Pressure(psiorbar)xTemperature(�For�C) In most selection processes, the temperature of the We strongly recommend that pressure and tempera- fluid at the gasketed joint should be considered first. This ture be considered simultaneously by using the following will reduce the number of product candidates quickly, es- procedure: pecially as temperatures go from 200�F (95�C) to 1,000�F 1. First select the Garlock style(s) being considered for (540�C). When system operating temperatures approach a your application/service, particular gasket materials maximum continuous operating 2. List the maximum pressure, temperature and P x T temperature limit, an upgrade to a superior material is sug- value for the style(s), gested. In some situations cryogenic temperatures must 3. Make sure the actual service conditions do not exceed also be considered. the style limitations in any of the three criteria. If they dont, the style(s) can be used, provided all other Application requirements are met. If they do exceed any one limit, The most important information under Application is another style or styles should be considered. Rarely the type of flange and bolts used. The number, size and can a style be recommended when the service condi- grade of bolts used in the application determines the load tions of pressure and temperature are both at the available. The surface area being compressed is calcu- maximum limits for that style. lated from the gasket contact dimensions. The load from the bolts and the contact area of the gasket result in the � Example: BLUE-GARD Compressed Asbestos-free compressive load available to seal the gasket. We have Gasketing Style 3000 calculated and tabulated this information on standard ANSI 1. Pressure Limit: 1,000 psig (70 bar) raised face flanges (see page C-45). Compressive stress 2. Maximum Temperature Limit: 700�F (370�C); available on non-standard flanges must be calculated on Continuous Operating Temp.: 400�F (205�C) an individual basis. Without this information, we cannot choose between various types of materials such as elasto- 3. P x T Limit: 350,000* (12,000) � meric (rubber) gaskets, compressed sheet, GRAPH-LOCK At 1,000 psig (70 bar), maximum temperature is � and GYLON styles. 350�F (180�C). Media Important There are thousands of different fluids. We cannot, in Maximum pressure and P x T ratings are based on this manual, make recommendations for all fluids. Fortu- the use of ANSI RF flanges at our preferred torque. nately, however, there are a relatively limited number of The ratings were developed using laboratory tests fluids that make up the vast majority of the media encoun- at ideal gasketing conditions. Field conditions will tered in industry. A general overview of fluid compatibility is undoubtedly affect the gasket performance. provided for the most popular styles shown in this manual (see Chemical Resistance chart, pages C-26 to C-38). When approaching maximum pressure, continu- System cleanout and flushes should also be considered. ous operating temperature, minimum temperature or Additional information on products versus fluids is available 50% of maximum PxT, consult Garlock Applications upon request. Engineering. Pressure We hasten to point out that this method for gasket Next to be considered is the internal pressure of the selection is merely a general guide and should not be the fluid at the gasketed joint. We list the maximum pres- sole means for selecting or rejecting a product. sure limits for each style. If severe and frequent pressure changes are involved, we should be given the details, since * P x T based on 1/16" sheet thickness unless otherwise stated. an alternative product may be needed. � GarlocGarlockk GaGaskskeettss C-25
Goodyear Rubber Products
