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Unless otherwise specified in the appropriate valve product standard, leakage from the operating mechanism sealing is permitted at the shell test pressure provided that there is no visually detectable leakage when the test pressure is 1,1 times the allowable pressure at room temperature. The choice of the test fluid is the responsibility of the manufacturer.
Guidance on stiles and gates
The test pressure shall be maintained for the test duration time specified in A. The shell shall be examined for leak tightness as follows: A check shall be made for bubbles breaking the surface of the water.
Alternatively the valve shall be coated with a leak detection fluid and a check shall be made for the continuous formation of bubbles. When the shell is tested in a production line and the time of one production cycle is shorter than the production test time specified in Table A. Unless otherwise specified in the appropriate product standard, when the test fluid is a liquid, leakage from the operating mechanism sealing is permitted provided that there is no visually detectable leakage when the test pressure is 1,1 times the allowable pressure at room temperature.
Fill the valve cavity including if appropriate, the bonnet cavity with the test fluid. Ball valve 2. Move the obturator to the closed position. Plug valve 3.
Apply the test pressure specified in A. Determine the leakage rate. Repeat 3 and 4 inclusive for the other side of the valve.
Fill the upstream valve cavity with the test fluid. Diaphragm valve 1. Fill the valve cavity with the test fluid. See NOTE 6.
Butterfly valve 1. Test double disc butterfly valves either in both directions with the body vent plug removed, or test by introducing the test pressure between the discs via a shell tapping and measuring leakage either side of the disc. Check valve 1. Fill the downstream valve cavity including, if appropriate, the cover cavity with the test fluid.
British standard BS 5760
NOTE 1 The procedure described may not ensure pressurization of the integrate space of double seated valves and may not therefore permit verification of the leakage rate of the downstream seat. When such pressurization is a requirement of the product or performance standard, or is required by the downloadr, it may be necessary to carry out step 3 before step 2. NOTE 2 Valves which incorporate "double block and bleed" design feature have the bleed plug removed prior to the test in order to prove the "double block and bleed" capability.
NOTE 3 Valves with independent double seating such as two-piece obturator or double-seated valves may be tested by applying the test pressure between the seats and checking each side of the closed valve.
NOTE 4 Soft seated ball valves previously subjected to a liquid seat test pressure may have a reduced performance capability in some subsequent services at low differential pressures. If a liquid seat test pressure is specified and is carried out before a low pressure gas seat test, it may be necessary to allow time for the seat material to recover. NOTE 5 With plug valves relying on a sealing compound to effect a seal, it is possible to charge with sealing compound prior to testing.
NOTE 6 Valves with symmetrical seating may be tested in either direction. Leakage rates are given in Table A. NOTE 2 "No visually detectable leakage" means no visible weeping or formation of drops or bubbles and is a lower leakage rate than Rate B.
Other requirements and other EU Directives may be applicable to the product s falling within the scope of this standard. Compliance with the clauses of this standard given in Table ZA.
Table ZA. It presents the UK view on standards in Europe and at the international level.PDF copies and Online Library orders that are paid via credit card will be fulfilled immediately. EN , Valves — Terminology — Part 1: Once you have downloadd your British Standards Download you will be entitled to download one copy of each British Standards PDF onto a single computer.
Your name. Gates that are tied shut with twine, wire or locked in any way are considered an obstruction and gates can not be erected across a right of way where none previously existed, other than for controlling stock.
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