4.9　Accumulator

4.9.1　The installation of accumulators 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 levelness or verticality shall be adjusted，and the measurement by leveler or suspension wire should be carried out，with the allowable deviation of 0.1/1000 for weight loaded accumulator and 1.0/1000 for other accumulators except weight loaded accumulator.The anchor bolts shall be tightened.

4.9.2　For accumulator installation，it is forbidden to open its vent cap，screw the safe valves，adjust the screws or change the ex-factory setting values.