9 Equipment and Pipes of Fuel Oil System
9.1 General Provisions
9.1.1 This Chapter is applicable to the construction and acceptance for the equipment and pipes of fuel oil system in thermal power plants.
9.1.2 Fuel oil system shall be completed in one stage according to the design requirements.Otherwise，the safe and reliable isolation transition measures shall be taken.
9.1.3 The specifications and materials of the equipment，pipes，valves and pipe fittings in fuel oil system shall meet the design drawing requirements，and the fuel oil pipes shall not be equipped with the cast iron valves.
9.1.4 Before the erection of valves，hydrostatic test shall be carried out under the 1.5 times the work pressure.The erection shall ensure the valve chamber clean and the direction shall be correct.For those valves which the disassembly inspection not be allowed by the manufacturer，the corresponding quality documents shall be provided by the manufacturer.
9.1.5 The sealing gaskets in the fuel pipes shall be selected according to the design requirements.
9.1.6 Before the erection of pipes，the pipe internal cleaning must be carried out to remove the dusts and sundries.If any hole is required to drill in the pipe，the mechanical drilling shall be taken to prevent any iron scrap falling into the pipe.
9.1.7 The installation of the pipes in the fuel oil system shall also comply with the related requirements of DL 5190.5 Technical Specification for Thermal Power Erection and Construction-Part 5:Piping and System and DL/T 869 Code of Welding for Thermal Power Plant.The welding shall be carried out by the welders with the corresponding qualification certificates，and the welding in the fuel pipes shall be carried out with the argon arc welding prime process.
9.1.8 The corrosion protection of welding joints in buried fuel pipes shall be carried out after passing hydrostatic test under 1.5 times design pressure.The pipes can be buried after acceptance.
9.1.9 The grounding and anti-static measures for the equipment and pipes in fuel oil system shall be taken according to the design construction requirements.The reliable anti-static bridge connection shall be provided in the valve flanges or other connection locations in the non-welding mode.
9.1.10 The pipe clamp structure rather than welding lugs should be adopted in the pipe with supports and hangers for fuel pipes.
9.1.11 During the extension construction or trial operation of fuel oil system，the safety measures shall be provided for hot work，which shall be reviewed and approved by the safety department.