Abstract
In this paper result of an extensive comparative experimental study of a gasketed and non-gasketed flange joint with different assemblies with different combined load combinations is carried out to investigate joint performance i.e. joint strength and sealing capability. Actual joint load capacities are determined under both the design and proof test pressure with maximum additional external loading (axial and bending) that can be applied for safe joint performance. In addition, application of combined load is also discussed in the light of equivalent pressure approach.
Highlights
Different types of flange joints evolved over the centuries and were perfectly adequate for their duties at low pressure and temperature
Non-gasketed flange joints are considered as an alternative due to the ‘static mode of load’ under bolt up and different internal pressure and temperature loading [3,4,5,6,7,8,9,10], providing better joint strength and sealing capabilities
Strains were recorded during loading and unloading and the joint was monitored for any leakage and opening or gap
Summary
Different types of flange joints evolved over the centuries and were perfectly adequate for their duties at low pressure and temperature. Available design rules [1,2] for flange joints are mainly concerned with the strength of the flanges and do not sufficiently consider for their sealing These do not address the effect of any external loading on integrity and sealing performance. For the past few years, it has been realised that the actual load conditions should be considered for the design of the joints Regarding this in new European code prEN13445 [18] based on prEN1591-1, for the alternative design method, consideration is given to the load capacity of the joints for other external loading in addition to the internal pressure. The level and distribution of different stress magnitudes and its variation are used to quantify joint strength, whereas joint’s sealing behavior is studied from any physical leakage/seepage from the joint during tests
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