BS EN 12266-1:2012 pdf download – Industrial valves — Testing of metallic valves Part 1 : Pressure tests, test procedures and acceptance criteria — Mandatory requirements
This European Standard specifies requirements for tests, test procedures and acceptance criteria for productiontesting of industrial valves made of metallic materials.
The specified tests may also be used as type tests or acceptance tests.
Safety devices are not covered by EN 12266-1.
When specified as a normative reference in a valve product or performance standard, this European Standard is tobe considered in conjunction with given specific requirements of the valve product or performance standard.Whererequirements in a product or performance standard differ from those given in this European Standard,therequirements of the product or performance standard apply.
NOTE For testing of industrial valves of thermoplastic materials, ISO 9393-1 and ISO 9393-2 apply.
2Normative references
The following documents, in whole or in part,are normatively referenced in this document and are indispensablefor its application.For dated references, only the edition cited applies.For undated references, the latest edition ofthe referenced document (including any amendments) applies.
EN 736-1:1995,Valves — Terminology — Part 1: Definition of types of valves
EN 736-2:1997,Valves—Terminology— Part 2: Definition of components of valvesEN 736-3:2008,Valves – Terminology — Part 3: Definition of terms
EN 1349,Industrial process control valves
Terms and definitions
For the purposes of this document,the terms and definitions given in EN 736-1:1995，EN 736-2:1997,EN 736-3:2008 and the following apply.
3.1
shell test
test at a pressure in excess of the cold working pressure (3.7) rating of a valve for the purpose of validating thesoundness and strength of the valve pressure containing and retaining structures
Note 1 to entry: These structures include valve-actuating mechanisms that have a direct connection to the valve internalssubject to fluid test pressure within the valve proper.
3.2
test pressure
internal pressure (gauge), expressed in bar 1) to which the valve under testing is subjected
Note 1 to entry: Unless otherwise noted, gauge pressure is used throughout this European Standard.
3.3
test fluid
pressurized liquid or gas used to test a valve
3.4
test fluid temperature
temperature of the test fluid, ≥ 5 C and ≤40°c
3.5
DN, NPS
alphanumeric designation of size that is common for components used in a piping system, used for referencepurposes, comprising the letters “DN or NPS” followed or preceded by a dimensionless number indirectly related tothe physical size of the bore or outside diameter of the end connections
Note 1 to entry: The number following “DN or NPS” does not represent a measurable value and should not be used forcalculation purposes except where specified in a product standard.
3.6
PN or Class
alphanumeric designation for pressure-temperature rating that is common for components used in a piping system,used for reference purposes,comprising the letters “PN or Class” followed by a dimensionless number indirectlyrelated to the pressure retaining capability as a function of temperature of the component
3.7
cold working pressurecwP
maximum fluid pressure assigned to a valve for operation at a fluid temperature of – 20 °C to 38 °C
Note 1 to entry: Valve pressure-temperature ratings are specified in product standards by reference to PN or Classdesignations.
3.8
double block-and-bleed valve
valve with two separate closure seating surfaces that,when in the closed position, block the flow from both endswhen the cavity between the two seating surfaces is vented through a bleed connection between the body cavityand the outside environment
4Test requirements
Test procedures and acceptance criteria shall be as given in Table 1 and Annex A.
a) Shell strength test P10 is mandatory for every valve except when a statistical sampling is permitted.
b) Shell tightness test P11 is mandatory for every valve except when a statistical sampling is accepted.
c) Seat tightness test P12 is mandatory for every isolating and check valve except when a statistical sampling is
accepted.
The seat tightness test for control valves shall be in accordance with EN 1349.