4.10　Pump and Pump Set

4.10.1　The installation of pumps and pump sets shall comply with the following requirements:

1　The longitudinal and horizontal center lines shall be adjusted，and the measurement by plumb wire should be carried out，with the allowable deviation of 10.0mm.

2　The elevation shall be adjusted，and the measurement by optical instrument or ruler should be carried out，with the allowable deviation of±10.0mm.

3　The axial levelness shall be adjusted，and the measurement by leveler should be carried out，with the allowable deviation of 0.1/1000 for centrifugal pump and 0.5/1000 for positive displacement pump.

4　The horizontal levelness shall be adjusted，and the measurement by leveler should be carried out，with the allowable deviation of 0.2/1000 for centrifugal pump and 0.5/1000 for positive displacement pump.

4.10.2　The assembly of couplings shall conform to related requirements of the current national standard General Code for Construction and Acceptance of Mechanical Equipment Installation Engineering（GB 50231）.