4.4 Erection of Four Main Pipes
4.4.1 This clause is applicable to the quality acceptance of preparation and erection of Supports and hangers of the main steam pipes，the hot reheat steam pipes，the cold reheat steam pipes，the main feedwater pipes and bypass pipes for thermal power plants.See Table 4.4.1 about the acceptance standards.The quality acceptance of preparation and erection of Supports and hangers of other alloy steel pipes（including the steam conduits of turbine and the drain pipes of this system）may be carried out with reference to this clause.
Table 4.4.1 Preparation and erection of supports and hangers of four main pipes
Table 4.4.1（Continued）
Table 4.4.1（Continued）
Table 4.4.1（Continued）
4.4.2 This clause is applicable to the quality acceptance of erection of the main steam pipes，the hot reheat steam pipes，the bypass pipes and the relevant accessories for thermal power plants.See Table 4.4.2 about the acceptance standards.The quality acceptance of erection of other alloy pipes（including the steam conduits of turbine and the drain pipes of this system）may be carried out with reference to this clause.
Table 4.4.2 Erection of main steam pipes and hot reheat steam pipes
Table 4.4.2（Continued）
4.4.3 This clause is applicable to the quality acceptance of erection of the cold reheat steam pipes and the corresponding bypass pipes as well as the accessories for thermal power plants.See Table 4.4.3 about the acceptance standards.The quality acceptance of erection of other carbon steel and general low alloy high pressure pipes（including the drain pipes of this system）may be carried out with reference to this clause.
Table 4.4.3 Erection of cold reheat steam pipes
Table 4.4.3（Continued）
4.4.4 This clause is applicable to the quality acceptance of erection of the main feedwater pipes and the corresponding bypass pipes as well as the accessories for thermal power plants.See Table 4.4.4 about the acceptance standards.The quality acceptance of erection of other carbon steel and ordinary low alloy high pressure pipes（including the drain pipes，water discharge pipes and vent pipes of this system）may be carried out with reference to this clause.
Table 4.4.4 Erection of main feedwater pipes
Table 4.4.4（Continued）
4.4.5 This clause is applicable to the inspection and acceptance of the displacement indicators on the four main pipes and the bypass pipes for thermal power plants.See Table 4.4.5 about the acceptance standards.
Table 4.4.5 Erection of displacement indicator
4.4.6 This clause is applicable to the inspection and acceptance of erection of the creep supervision sections and the creep measurement points of the high temperature and high pressure pipes for thermal power plants.See Table 4.4.6 about the acceptance standards.
Table 4.4.6 Erection of creep supervision section and creep measurement points
Table 4.4.6（Continued）
4.4.7 This clause is applicable to purging inspection of the main steam pipes，the cold and hot reheat steam pipes（including the bypass pipes）for thermal power plants.See Table 4.4.7 about the acceptance standards.
Table 4.4.7 Purging of steam pipes
Table 4.4.7（Continued）
4.4.8 This clause is applicable to the flushing inspection of the main feedwater pipes and the bypass pipes for thermal power plants.See Table 4.4.8 about the acceptance standards.
Table 4.4.8 Flushing of pipes of feedwater system
Table 4.4.8（Continued）
4.4.9 This clause is applicable to the process control and inspection of erection of the four main pipes for thermal power plants，including the following record tables.The columns of acceptance company not belong to the acceptance scope in the record tables shall be marked with"/".
1）Table 4.4.9-1 Measurement record of pipe creep
2）Table 4.4.9-2 Erection record of displacement indicator
3）Table 4.4.9-3 Erection record of measurement devices of flow rate
4）Table 4.4.9-4 Inspection record of pipes and fittings
5）Table 4.4.9-5 Tracing record of nozzles on pipes（erection）
6）Table 4.4.9-6 Erection and adjustment record of the supports and hangers
7）Table 4.4.9-7 Acceptance record of inspection（maintenance）and test for valves
8）Table 4.4.9-8 Hot condition adjusting record of safety valves
9）Table 4.4.9-9 Adjustment and acceptance record of electrically operated valves
10）Table 4.4.9-10 Acceptance and certification sheet for concealed works
11）Table 4.4.9-11 Acceptance and certification sheet for leak test
12）Table 4.4.9-12 Inspection and certification sheet of key points/important processes
13）Table 4.4.9-13 Inspection record of pipes prior to hydrostatic test
14）Table 4.4.9-14 Certification sheet of purging（flushing）for piping system
15）Table 4.4.9-15 Verification list of implementation for mandatory requirements
Table 4.4.9-1 Creep measurement record of pipe
Table 4.4.9-2 Erection record of displacement indicator
Table 4.4.9-3 Erection record of measurement devices of flow rate
Table 4.4.9-4 Inspection record of pipes and fittings
Table 4.4.9-5 Tracing record of nozzles on pipes（erection）
Table 4.4.9-6 Erection and adjustment record of the supports and hangers
Table4.4.9-7 Acceptance record of inspection（maintenance）and test for valves
Table4.4.9-8 Hot condition adjusting record of safety valves
Table 4.4.9-9 Adjustment and acceptance record of electrically operated valves
Table 4.4.9-10 Acceptance and certification sheet for concealed works
Table 4.4.9-11 Acceptance and certification sheet for leak test
Table 4.4.9-12 Inspection and certification sheet of key points/important processes
Table 4.4.9-13 Inspection record of pipes prior to hydrostatic test
Table 4.4.9-14 Certification sheet of purging（flushing）for piping system
Table 4.4.9-15 Verification list of implementation for mandatory requirements
Table 4.4.9-15（Continued）
Table 4.4.9-15（Continued）
Table 4.4.9-15（Continued）
Table 4.4.9-15（Continued）
Table 4.4.9-15（Continued）
Table 4.4.9-15（Continued）
Table 4.4.9-15（Continued）
