Recommendation FLIX-209 (iv): Clarify British Standard for pipework test pressure and design pressure definition

That the British Standard referring to the pressure to which pipe work should be tested (see paragraph 73 above) should be clarified. At present it is ambiguous in its reference to testing to 1 -3 x the “design pressure”. It should be made clear whether, “design pressure” means “maximum operating pressure” or “relief valve pressure” and if the former that a test to above relief valve pressure is always required.