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SECTION 2 GENERAL PIPING DESIGN 1 General 1.1 Application 1.1.1 This section gives minimum requirements which apply to piping systems, including bends, tees, valves, fittings, flanges, flexible elements, etc. 1.1.2 The design and installation of piping systems should conform to a recognised design code or standard, subject to any modifications under the requirements in this standard. 1.1.3 Piping systems used for safe operation of the unit or installation shall in general be separate from piping systems used for drilling or production operations. If cross connections are necessary, appropriate means shall be fitted to prevent possible contamination of the safe system from any hazardous medium. 1.1.4 All requirements are based on the assumption that piping and components are subject to preventive maintenance throughout the intended lifetime of the unit or installation. For cases where this assumption is not valid, corrosion resistant materials, additional corrosion allowance and/or special corrosion protection should be considered. 1.1.5 If a floating offshore installation other than MOU is intended to be built and disposed within the EU member states,including EEA and EFTA, the piping design including components and materials must conform to the minimum safety requirements outlined in the Pressure Equipment Directive 2014/68/EU. Exclusions from the directive are listed in article no. 1 in the directive. Harmonized European standards for the design and fabrication of materials, valves, fittings and pipes will in general fulfil the requirements outlined in the directive. Guidance note: The Pressure Equipment Directive may also be referred to as the PED Directive. It's formal title is: DIRECTIVE 2014/68/EU OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 May 2014 on the harmonisation of the laws of the member states relating to the making available on the market of pressure equipment. ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- 1.2 Categories of piping classification 1.2.1 Piping classification is applied on the basis of intended medium, pressure and temperature conditions. 1.2.2 The designated piping class is used to indicate the materials, manufacturing and inspection requirements which shall be applied to ensure the operational integrity of piping. 1.2.3 For the purpose of certification, testing, type of joint to be adopted, heat treatment and welding procedures, piping shall be subdivided into three classes as given in Table 1. Guidance note: In addition to the pressure piping systems in Table 1, class III pipes may be used for open ended piping, for example overflows, vents and open ended drains ---e-n-d---o-f---g-u-i-d-a-n-c-e---n-o-t-e--- Offshore standards, DNVGL-OS-D101. Edition January 2018 Page 24 Marine and machinery systems and equipment DNV GL AS Chapter 2 Section 2PDF Image | Marine and machinery systems and equipment 2018
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