Sch 2 para 4 Design for adequate strength
(1) Pressure equipment must be designed for loadings appropriate to its intended use and must take account of other reasonably foreseeable operating conditions, including, in particular, the following factors— (a) internal/external pressure; (b) ambient and operational temperatures; (c) static pressure and mass of contents in operating and test conditions; (d) traffic, wind, earthquake loading; (e) reaction forces and moments which result from the supports, attachments, piping etc. ; (f) corrosion and erosion, fatigue, etc.; (g) decomposition of unstable fluids. (2) Various loadings which can occur at the same time must be considered, taking into account the probability of their simultaneous occurrence. (3) Design for adequate strength must be based on either of the following— (a) as a general rule, a calculation method, as described in paragraph 5, and supplemented if necessary by an experimental design method as described in paragraph 6; (b) an experimental design method without calculation, as described in paragraph 5, when the product of the maximum allowable pressure PS and the volume V is less than 6 000 bar L or the product PS·DN less than 3 000 bar.