Gasket selection for FRP flanges is critical to prevent leakage of corrosive chemicals; however, the stress limitations of the flange material create problems that make this uniquely challenging. In this presentation from our Plant Engineers Forum, Tim Rice of VSP Technologies discusses the nuances of FRP flange sealing.
Unlike metallic flanges that withstand high bolt torque, FRP flanges require low-stress sealing materials (such as full-face ePTFE or soft elastomeric compounds) to achieve a leak-tight joint without cracking the flange hub or face.
The session details proper bolt torque sequences, gasket seating stress calculations, thermal relaxation factors, and practical guidelines for chemical plant operators.