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Test Procedures BlowoutofGasketProducts CreepRelaxationofGasketMaterial (NoASTMDesignation) ASTMDesignation:F38MethodB Garlock developed the equipment and test procedure Measured by means of a calibrated bolt with dial used for testing the blowout resistance of gaskets at vary- indicator, ASTM F38 provides a means for measuring the ing pressures and temperatures. amount of creep relaxation of a gasket material at a stated time after a compressive stress has been This test method and procedure enable us to compare applied. There is no fluid involved. the blowout resistance of all types of non-metallic gasket- ing products. The test fluid is nitrogen gas. Internal pres- This method is designed to compare related products sures can be varied from atmospheric to approximately under controlled conditions in regard to their ability to 5,000 psig (345 bar). The flanges and gaskets can be maintain a given compressive stress as a function of time. exposed to temperatures up to 1,000�F (540�C). A portion of the torque loss on the bolted flange is a result of creep relaxation. Creep relaxation is defined by ASTM Garlock blowout tests are primarily used to compare as: "A transient stress-strain condition in which the strain various products, and do not represent results that can increases concurrently with the decay of stress." The be expected under actual field conditions. The experience result of creep relaxation is loss of thickness of a gasket, gained over many years in blowout testing provides part of which causes bolt torque loss, resulting in leakage. the technical backup of our data on longer term P (psig or bar) x T (�F or �C) values. Torque loss also can be caused by elongation of bolts, flange distortion and vibration. Therefore, results obtained in lab conditions should be correlated with field results. CompressibilityandRecoveryofGasket Also see Torque Retention Test for further Material information. ASTMDesignation:F36 This method covers determination of the short-time FluidResistanceofGasketMaterials compressibility and recovery at room temperature of sheet gasket materials. ASTMDesignation:F146 This test method is not intended as a test for com- These methods provide a standardized procedure for pressibility under prolonged stress applications, generally measuring the effect of immersion on physical properties referred to as "creep", or for recovery following such pro- of non-metallic gasketing materials in specified fluids un- longed stress applications, the inverse of which is gener- der defined conditions of time and temperature. The types ally referred to as "compression set". of materials covered are those included in the first numeral described in Classification F104. They are not applicable Some initial compressibility is essential for proper to the testing of vulcanized rubber, a method described in installation of a gasket and is required to compensate Test Method D471. for any flange irregularities such as minor flaws or nicks, non-parallelism, corrosion and variations in groove depth. The test fluids and conditions outlined were selected Voids must be filled to obtain proper seating of the gasket as typical for the purposes of comparing different materi- or premature failure will occur. als, and can be used as a routine test when agreed upon between the supplier and purchaser. The results of immer- In addition, good recovery upon release of load is sion tests are not intended to give any direct correlation indicative of torque retention of a gasketed joint. with service conditions in view of the wide variations in temperature and special uses encountered in gasket ap- Compressibility and recovery as defined by ASTM are two worthwhile physical property criteria for supplier and plications. purchaser to agree upon as routine tests. C-54
Goodyear Rubber Products
