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November Letters Facts at Your Fingertips: Forces Acting on a Gasket

By Sanjeev Shukla, Sr. Engineer-Mechanical Engineering & Technology Department PTT Exploration and Production Public Co. Ltd. Bangkok, Thailand |

This letter is in reference to the article, Forces Acting on a Gasket [ Chem. Eng. October, 2014, p. 32a]. I need to clear my understanding on the seating stress required for the proper sealing. As per the article, seating stress for the proper sealing is indicated [see Equation (4) in the article]. This formula provides the total/maximum bolt loads on the gasket, which can be applied for the selected bolt size and the material. This total bolt load may or may not be suitable to provide minimum required force/load for gasket seating and operating conditions. Different codes and standards provide guidelines to calculate minimum-required bolt load for the proper sealing of the gasket joint. This minimum required force depends on gasket properties (gasket seating stress and factor) based on which, selection is made for the number and the size of the bolts. Material shall be obviously based on intended service. I think that [Equation (4)] is not properly presented in the article and should be corrected. There are many references available in different international codes and industry standards. One of the worldwide used reference is ASME Sec VIII Div 1 (ASME Boiler and Pressure Vessel Code). Please refer to mandatory Appendix 2 (Rules…
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