Sch 2 para 40 Hydrostatic test pressure
For pressure vessels, the hydrostatic test pressure referred to in paragraph 27 must be no less than whichever is greater of the following— (a) that corresponding to the maximum loading to which the pressure equipment may be subject in service taking into account its maximum allowable pressure and its maximum allowable temperature, multiplied by the coefficient 1.25; (b) the maximum allowable pressure multiplied by the coefficient 1.43.