6.4　Governing Protection System and Oil System

6.4.1　Except the equipment are forbidden to be disassembled according to the equipment technical documentation，the other equipment of oil system shall be disassembly checked，and the equipment interior shall be clean.

6.4.2　The checking and installation of governing protection system shall be in accordance with the following requirements:

1　The disassembly checking of the governing protection elements should be carried out in an independent clean area one by one，and after the cleaning and checking is qualified，keep them in closed cabin；

2　The dimension of all sliding valve，bushing，spring，oil pipeline，window and the overlap of sliding valve and bushing shall comply with the regulations of design technical documentation.

6.4.3　The installation of oil system shall be in accordance with the following requirements:

1　The disassembly checking and installation required to be carried out to the centrifugal main oil pump shall be in accordance with the following requirements:

1）Radial shaking of pump shaft shall be less than 0.03mm，and the radial shaking of the blade sealing ring and the bushing outer circle shall be less than 0.05mm；

2）The pump case shall be well without obvious damage and cracks；

3）Splits of pump case shall be tightly contacted without any damage；

4）The oil sealing clearance of pump shaft shall comply with the regulations of equipment technical documentation；

5）The distance between impeller sealing ring and pump wheel shall comply with the regulation of equipment technical documentation，and the clearance shall be kept between impeller sealing ring and the pump case.

2　Regulate the floater linkage of the oil tank level gauge to conform to the regulation of equipment technical documentation；nozzle of oil injector shall be unblocked，the dimension shall comply with the regulation of equipment technical documentation，and the filter shall be well without damage；

3　Before installation of oil cooler，carry out cleaning to the interior，and the pressure test shall be carried out to the water side and oil side with the test pressure of 1.5 times of working pressure；

4　The installation position of the filter shall be correct and convenient to switching and cleaning，the plug and the oil relief valve shall be reliably installed without leakage，the filter shall be well without damage，and the switching shall be normal；

5　Beside the regulation of the Chapter 7 of this code，the oil system pipe construction shall be also in accordance with the following requirements:

1）Before installation，the cleanliness of the combined sleeved oil pipe interior shall be checked，guarantee that the interior is clean without debris，and the supports inside the sleeve pipe sould be fixed；

2）Before pipe connection，check the pipe interior is clean and the oil pipe open part shall be sealed；

3）Pipe connection should not use flange.The argon arc welding shall be applied for welding；

4）The aspect of slope towards the oil pump at the oil inlet pipe side should not be less than 3‰，and the aspect of slope towards the oil tank at the oil returning pipe side shall not be less than 5‰；

5）The expansion space shall be available between the oil pipe and equipment，adjacent pipe，and building；

6）The clear distance between oil pipe and external protection of insulation pipe and insulation equipment shall not be less than 150mm；

7）The oil pipe joint shall not support the valves and pipes；

8）The governing protection bushing and carbon steel pipe in lube oil system shall be removed，acid cleaned and passivated after being configured，the screwed connection part of the oil pipe with moving joint should not be cleaned with acid，after the pipes are recombined and the moving joints are tightened，connect the pipes through argon arc welding.

6　When the stainless steel pipes are applied in oil system，the stainless steel gasket or nonmetal gasket with the chlorine ion content below 500ppm shall be applied in the contacting parts between the pipe of iron supports and hangers for insulation；

7　The construction of emergency drain oil pipeline shall be in accordance with the following requirements：

1）The valves of the emergency drain oil pipeline shall apply gate valves，and before installation，test pressure shall be carried out as per the pressure in nameplate，the valve shall be well without leakage；

2）The emergency drain oil pipe of oil tank shall be connected to the emergency oil pit，and the installation shall be completed and confirmed to be unblocked before feeding oil to oil tank.