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A single copy of this British Standard is licensed to This British Standard has been prepared by Technical Committee PVE/2, Water-tube. BRITISH STANDARD BS EN Incorporating Corrigendum No. 1 Industrial valves — Testing of valves — Part 1: Pressure tests, test procedures and. BRITISH STANDARD. BS Reprinted, incorporating. Amendments No. 1 and. No. 2. Testing concrete —. Part Method for determination of.
Each Sector Board in turn constitutes several Technical Committees. It is the Technical Committees that, formally, approve a British Standard, which is then presented to the Secretary of the supervisory Sector Board for endorsement of the fact that the Technical Committee has indeed completed a task for which it was constituted.
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Products are commonly specified as meeting a particular British Standard, and in general this can be done without any certification or independent testing. The standard simply provides a shorthand way of claiming that certain specifications are met, while encouraging manufacturers to adhere to a common method for such a specification. The Kitemark can be used to indicate certification by BSI, but only where a Kitemark scheme has been set up around a particular standard.
It is mainly applicable to safety and quality management standards. There is a common misunderstanding that Kitemarks are necessary to prove compliance with any BS standard, but in general it is neither desirable nor possible that every standard be 'policed' in this way.
Following the move on harmonisation of the standard in Europe, some British Standards are gradually superseded or replaced by the relevant European Standards EN. Status of standards[ edit ] Standards are continuously reviewed and developed and are periodically allocated one or more of the following status keywords.
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Obsolescent - indicating by amendment that the standard is not recommended for use for new equipment, but needs to be retained to provide for the servicing of equipment that is expected to have a long working life, or due to legislative issues. Partially replaced - the standard has been partially replaced by one or more other standards.
Proposed for confirmation - the standard is being reviewed and it has been proposed that it is confirmed as the current standard.
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.
List of British Standards
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. Compliance with the clauses of this standard given in Table ZA. Table ZA.
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Email: membership bsi-global. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies.The choice of the test fluid is the responsibility of the manufacturer. The obturator of isolating and control valves shall be in a partially open position. API 6D. Help Center Find new research papers in: Sun Sun.
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