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SHANGHAI HUIXUAN VALVE

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Email:info@shxvalve.com
Address: NO.720, Suide Road, Jiading District,Shanghai, China.
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How to test a ball valve

2021-12-12

How to test a ball valve? There are two test we need do for a ball valve:Hydrostatic Shell Test and seat test, the detail test procudure,preparation,mathod and ceriteria as below.
 

Hydrostatic Shell Test

-Hydrostatic Shell Test Preparation, Method and Acceptance Criteria

Ball Valve ends shall be blocked and the closure member placed in the partially open position during the test. When present, relief valves that release to the atmosphere shall be removed and their connection points
plugged. Internal non-return valve shall be installed on sealant injection ports without the injection fitting.

The test pressure for the hydrostatic shell test shall be a minimum of 1.5 times the pressure rating conforming to
4.3 for material at 100 °F (38 °C) based on the valve end connector material. The test duration shall conform to
Table 9 based on the valve end connector size.

- Extended Hydrostatic Shell Test

When the valve has been designed to withstand a higher hydrostatic shell test pressure per 5.5, the shell test
pressure shall not be at less than 1.5 times the higher design pressure at 100 °F (38 °C).

When performing a higher hydrostatic shell test and the valve is flanged, the hydrostatic shell test shall be
performed with bore sealing plugs that ensure the flanges are not subjected to test pressures greater than 1 .5
times the valve flange rating.

The test duration specified in Table 9 shall start after stabilization.

There shall be no visible leakage permitted during the hydrostatic shell test.

Minimum Duration of Hydraulic Shell Test

Valve Size

Test Duration(minutes)

NPS

DN

≤4

≤100

2

6 to 10

150 to 250

5

12 to 18

300 to 450

15

20 and larger

500 and larger

30

FOOTNOTE= Test duration starts once the valve is stabilzed per manufacturer's procedures.


Seat Test

Hydrostatic Seat Test Preparation, Method and Acceptance Criteria

Lubricants or sealants shall be removed from seats and closure member sealing surfaces except where the
lubricant or sealant is the primary means of sealing.

NOTE See K.1 4 for guidance on performing alternative hydrostatic seat testing.

The test pressure for all seat tests shall be a minimum of 1 .1 times the pressure rating conforming to 4.3 for
material at 100 °F (38 °C) based on the valve end connector material. The test duration shall conform to Table
10 based on the valve end connector size.

Minimum Duration of Hydraulic Seat Test

Valve End Connector Size

Test Duration (minutes)

NPS

DN

≤4

≤100

2

6 to 18

150 to 450

5

20 and larger

500 and larger

10

FOOTNOTEa Test duration starts once the valve is stabilized per manufacturer's procedures.

Seat leakage shall be monitored from the downstream side of the seat when under hydrostatic seat test.
The acceptance criteria for leakage shall be as follows:

― For soft-seated valves and lubricated plug valves: leakage shall not exceed ISO 5208, Rate A (no visible
leakage for the duration of the test at test pressure).

― For metal-seated valves, other than check valves: leakage shall not exceed ISO 5208, Rate CD.
NOTE The test procedures for various types of block valve are specified in 1 0.4.3.

― For metal-seated check valves: leakage shall not exceed ISO 5208, Rate E.
On completion of hydrostatic seat testing, parts such as drain plugs and cavity-relief valves, shall be fitted in
conformance with the manufacturer’s documented procedures.

 

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