Regulation 15—Design and installation of pipeline by joining(1) A person who designs and installs a pipeline shall ensure that each joint can sustain the longitudinal pull out or thrust force caused by contraction or expansion of the piping or by anticipated external or internal loading.(2) Without limiting subregulation (1), each joint shall be made in accordance with written procedures that have been proved by test or experience to produce gastight joints.(3) The Commission shall designate a person to inspect each joint to ensure compliance with the requirements of the Fifth Schedule.