GB/T 38202-2019Installation, operation, maintenance of fully welded body ball valve (English PDF)

4.1 Pre-installation inspection

4.1.1

Before installing the ball valve, check whether the product certificate, installation and operation manual, etc. are complete. At the same time, it should check the other accompanying arrival ball valve

Attached materials, including delivery list, spare parts list, main parts quality certification documents, non-destructive testing reports, various inspection reports and tests

Reports, etc. The integrity of the supply should be checked against the delivery list and the supplier should be contacted immediately if a leak is found.

4.1.2

The visual inspection of the ball valve shall be carried out before installation, and shall comply with GB/T 24919 and the following requirements.

a) The packaging meets the requirements of the order contract, without damage or severe deformation. If there is damage, it should not be installed.

b) The ball valve number meets the requirements of the order contract. The nameplate is complete and clear, and the label is correct.

c) There are no cracks, mechanical damage, paint peeling, rust and other defects on the outer surface of the ball valve, as well as dirt, nameplate peeling and color mark inconsistency.

The relevant signs on the valve body shall be correct, complete, clear and in accordance with the relevant standards.

d) The ball valve is protected by a protective cover at both ends. There are no defects such as water accumulation, rust, dirt and damage in the valve body. The flange sealing surface should not have bumps and diameters.

Scratches and other damages that affect the sealing performance; the weld end groove is intact and there should be no mechanical damage affecting the weld.

e) The ball valve shall be in the “fully open” position unless otherwise specified.

f) The main parts should be free from damage. If the valve stem should be smooth, there should be no defects such as burrs, dents and cracks. The exposed parts should be protected.

Protection and so on.

g) The grease filling valve, drain valve, vent valve, pressure relief valve, actuator and other accessories on the valve body should be complete and intact.

h) There is no scratch on the ball valve seal.