4.5 Erection of Medium and Low Pressure Pipes
4.5.1 The erection of medium and low pressure pipes includes the erection of steam and water pipes，heating network pipes，exhaust steam pipes，compressed air pipes and other pipes（including galvanized steel pipes，welded steel pipes，seamless steel pipes，spiral pipes etc.）and corresponding accessories in thermal power plant，whose pressure is no more than 8.0MPa and whose design temperature is no more than 450°C.
4.5.2 This clause is applicable to the quality acceptance of the erection of medium and low pressure pipe Supports and hangers，whose acceptance criteria are shown in Table 4.5.2.
Table 4.5.2 Erection of supports and hangers of medium and low pressure pipes
Table 4.5.2（Continued）
Table 4.5.2（Continued）
4.5.3 This clause is applicable to the quality acceptance of the erection of medium and low pressure steel pipes except those in the exhaust steam system of air cooling units.The acceptance criteria are shown in Table 4.5.3.
Table 4.5.3 Erection of medium and low pressure pipes
Table 4.5.3（Continued）
Table 4.5.3（Continued）
Table 4.5.3（Continued）
4.5.4 This clause is applicable to the quality acceptance of the erection of pipes in the exhaust steam system of air cooling units，whose acceptance criteria are shown in Table 4.5.4.
Table 4.5.4 Erection of exhaust steam pipes in air cooling units
Table 4.5.4（Continued）
Table 4.5.4（Continued）
4.5.5 This clause is applicable to the quality acceptance of leak tests of medium and low pressure pipes，whose acceptance criteria are shown in Table 4.5.5.
Table 4.5.5 Leak tests of medium and low pressure pipes
Table 4.5.5（Continued）
4.5.6 This clause is applicable to the quality inspection and evaluation of the cleaning of medium and low pressure piping system，whose acceptance criteria are shown in Table 4.5.6.
Table 4.5.6 Cleaning of medium and low pressure piping system
Table 4.5.6（Continued）
4.5.7 This clause is applicable to the erection process control and inspection of medium and low pressure pipes in the thermal power plants，which includes the following record.All those acceptance company columns not belonging to the acceptance scope in the record tables shall be marked with slash（/）.
1）Erection Record of Compensation Devices-Table 4.5.7
2）Erection Record of Flow Devices-Table 4.4.9-3
3）Inspection Records of Pipes and Fittings-Table 4.4.9-4
4）Erection and Adjustment Record of Supports and hangers-Table 4.4.9-6
5）Valves Inspection（maintenance）and Test Acceptance Record-Table 4.4.9-7
6）Hot State Commissioning Record of Safety Valves-Table 4.4.9-8
7）Adjustment and Acceptance Record of Electric Valves-Table 4.4.9-9
8）Concealed Project Acceptance，Certification sheet-Table 4.4.9-10
9）Leak test Acceptance，Certification sheet-Table 4.4.9-11
10）Pre-pressure Test Inspection Table of Pipes-Table 4.4.9-13
11）Certification Sheet for Pipe System Blowing（Purging）-Table 4.4.9-14
12）Mandatory Requirements Implementation Verifying Table-Table 4.4.9-15
Table 4.5.7 Erection record of compensation devices
