4.17.1 All pipes and fittings shall be stainless steel to EN 10312・ All pipes, fittings, joints and joint materials used shall be suitable for the substances to be conveyed in the pipes and shall not deteriorate due to chemical or atmospheric action. All pipes and fittings shall have ample strength for the pressure involved. The Contractor shall submit the specifications of pipe, pipeline equipment and pipe accessories to the Engineer for approval.