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Pressure vessel has a complex structure. Pressure vessel structure is designed to hold internal pressure, temperature, external load, etc. There are two types of pressure vessel, those that vertical and horizontal pressure vessel. Horizontal pressure vessel is supported by saddle that is used to hold pressure vessel weight. Pressure vessel stress distribution is affected by saddle contact angle variations. Pressure vessel maximum stress values should be considered so the failure of structure can be decreased. This research aims to review the effect of saddle contact angle variations to stress distribution.