Security check
Please login to your personal account to use this feature.
Please login to your authorized staff account to use this feature.
Are you sure you want to empty the cart?
BS EN 1254-3:2021+A1:2025 Copper and copper alloys. Plumbing fittings - Compression fittings for use with plastics and multilayer pipes, 2025
- undefined
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- EN ISO 3501, Plastics piping systems — Mechanical joints between fittings and pressure pipes — Test method for resistance to pull-out under constant longitudinal force (ISO 3501)
- 3 Terms and definitions
- 4 Product characteristics [Go to Page]
- 4.1 Internal pressure [Go to Page]
- 4.1.1 For liquid applications
- 4.1.2 For fuel gas applications
- 4.1.3 For compressed air applications
- 4.2 Tightness [Go to Page]
- 4.2.1 Integrity of fabricated fitting bodies or having an 'as cast' microstructure
- 4.2.2 Requirements for liquid applications [Go to Page]
- 4.2.2.1 Leak tightness under internal hydrostatic pressure
- 4.2.2.2 Leak tightness under vacuum
- 4.2.2.3 Leak tightness under temperature cycling (for heating networks)
- 4.2.2.4 Resistance to pull-out
- 4.2.2.5 Leak tightness under internal hydrostatic pressure while subject to bending
- 4.2.3 Requirements for gas applications [Go to Page]
- 4.2.3.1 Leak tightness under internal pneumatic pressure
- 4.2.3.2 Resistance to pull-out
- 4.2.3.3 Leak tightness under temperature cycling for fuel gas applications
- 4.2.3.4 Leak tightness under internal hydrostatic pressure while subject to bending
- 4.2.3.5 Compression fitting with elastomeric seals for fuel gas application inside buildings
- 4.2.3.6 Compression fitting with elastomeric seals for fuel gas application outside buildings
- 4.3 Resistance to high temperature for fittings with elastomeric seals (for heating networks)
- 4.4 Release of dangerous substances
- 4.5 Durability [Go to Page]
- 4.5.1 Durability of internal pressure: Resistance to stress corrosion
- 4.5.2 Durability of tightness [Go to Page]
- 4.5.2.1 Resistance to dezincification
- 4.5.2.2 Resistance to pressure cycling for liquid applications
- 4.6 Wall thickness at the threaded portions of fittings and/or compression nut
- When assessed according to the method specified in 5.5 the minimum wall thickness at the interface thread or jointing thread shall be as expressed in !EN 1254-20:2021+A1:2025, 4.1" for the relevant diameters. [Go to Page]
- 4.7 Dimensions of tail pipe ends for swivel fittings
- When assessed according to the method specified in 5.6 the dimensions shall be as expressed in !EN 1254-20:2021+A1:2025, 4.2" for the thread size. [Go to Page]
- 4.8 Dimensions of gas union connectors
- When assessed according to the method specified in 5.7 the dimensions shall be as expressed in !EN 1254-20:2021+A1:2025, 4.3" for corresponding nominal size. [Go to Page]
- 4.9 Threaded end dimensions
- When assessed according to the method specified in 5.8 the thread shall be in accordance with !EN 1254-20:2021+A1:2025, 4.4". [Go to Page]
- 4.10 Other adapter ends (not defined in !EN 1254-20:2021+A1:2025")
- 4.11 Bore dimensions
- 4.12 Identity of elastomeric sealing material for liquid applications
- 4.13 Identity of elastomeric sealing material for gas applications
- 4.14 Pipe abutment
- 4.15 Alignment of the fitting ends
- 4.16 Shapes for tightening systems
- 4.17 Surface condition
- 4.18 Plated or coated surfaces
- 4.19 !Wall thickness of the fitting body
- 5 Testing, assessment and sampling methods [Go to Page]
- 5.1 General [Go to Page]
- 5.1.1 Preparation of fittings for testing
- 5.1.2 Test temperature
- 5.1.3 Tolerances
- 5.2 Internal pressure [Go to Page]
- 5.2.1 Internal hydrostatic pressure test
- Table 1 — Hydrostatic pressure test parameters [Go to Page]
- 5.2.2 Internal pneumatic pressure test for fuel gas applications
- Table 2— Internal pneumatic pressure test parameters for fuel gas applications [Go to Page]
- 5.2.3 Internal pneumatic pressure test for compressed air applications
- Table 3 — Hydrostatic pressure test parameters
- Table 4 — Internal pneumatic pressure test parameters for compressed air [Go to Page]
- 5.3 Tightness [Go to Page]
- 5.3.1 General tests [Go to Page]
- 5.3.1.1 Integrity of fabricated fitting bodies or having an 'as cast' microstructure
- Table 5 — Pneumatic pressure test parameters [Go to Page]
- 5.3.1.2 Resistance to pull-out
- Table 6 — Pull-out test parameters [Go to Page]
- 5.3.2 Tests for liquid applications [Go to Page]
- 5.3.2.1 Leak tightness under vacuum
- Table 7 — Leak tightness under vacuum test parameters [Go to Page]
- 5.3.2.2 Leak tightness under temperature cycling
- Table 8 — Leak tightness under temperature cycling test parameters
- Table 9 — Test parameters for resistance to thermal cycling [Go to Page]
- 5.3.2.3 Leak tightness under internal hydrostatic pressure while subjected to bending
- Table 10 — Test parameters for leak tightness under internal hydrostatic pressure while subjected to bending [Go to Page]
- 5.3.3 Tests for gas applications [Go to Page]
- 5.3.3.1 Leak tightness under temperature cycling
- Table 11 — Resistance to operating temperature variation: test parameters [Go to Page]
- 5.3.3.2 Leak tightness under internal hydrostatic pressure whilst subjected to bending
- Table 12 — Bending test parameters [Go to Page]
- 5.4 Durability [Go to Page]
- 5.4.1 Durability of internal pressure: Resistance to stress corrosion
- 5.4.2 Durability of tightness [Go to Page]
- 5.4.2.1 Resistance to dezincification
- 5.4.2.2 Resistance to pressure cycling for liquid applications
- Table 13 — Resistance to pressure cycling test parameters [Go to Page]
- 5.5 Wall thickness at threaded portions of adaptor fittings [Go to Page]
- 5.5.1 Type testing
- 5.5.2 FPC testing
- 5.6 Dimensions of tail pipe ends for swivel fittings
- 5.7 Dimensions of gas union connectors [Go to Page]
- 5.7.1 Type testing
- 5.7.2 FPC testing
- 5.8 Threaded end dimensions
- 5.9 Bore dimensions
- 5.10 Identity of elastomeric sealing material for liquid applications
- 5.11 Identity of elastomeric sealing material for gas applications
- 5.12 Alignment of the fitting ends
- 5.13 !Wall thickness of the fitting body
- 6 Evaluation of conformity [Go to Page]
- 6.1 General
- 6.2 Type testing [Go to Page]
- 6.2.1 General
- 6.2.2 Test samples, testing and compliance criteria
- Table 14 — Number of samples to be tested and compliance criteria for liquid applications [Go to Page]
- 6.2.3 Test reports
- 6.3 Factory production control (FPC) [Go to Page]
- 6.3.1 General
- 6.3.2 Equipment [Go to Page]
- 6.3.2.1 Testing
- 6.3.2.2 Production
- 6.3.3 Raw materials and components [Go to Page]
- 6.3.3.1 General
- 6.3.3.2 Product testing and evaluation
- Table 17 — Number of samples to be tested and compliance criteria for liquid applications
- Table 18 — Number of samples to be tested and compliance criteria for gas applications
- 7 Designation
- a) common term describing the pattern (e.g. coupling, bend, elbow, tee, etc.);
- b) reference to this document and part;
- c) the nominal outside diameter of the connecting pipe or, in the case of fittings incorporating threaded connections, by the thread designation (see NOTE for sequence of specifying ends);
- e) without abutment, if applicable;
- f) if required, the grade of dezincification resistance;
- g) if required, the type of plating or coating.
- 8 Marking, labelling and packaging [Go to Page]
- 8.1 General
- 8.2 Additional marking
- 8.3 Dezincification resistant copper zinc alloys
- Annex A (normative) Operating temperatures and design pressures
- Table A.1 — Design temperatures for fittings with compression ends when used with hot and cold liquids
- Table A.2 — Operating temperatures and maximum operating pressures for fittings with compression ends when used with fuel gas
- Table A.3 — Operating temperatures and maximum operating pressures for fittings with compression ends when used with compressed air
- Bibliography
- [3] EN 1655, Copper and copper alloys — Declarations of conformity
- [5] EN 1982, Copper and copper alloys — Ingots and castings
- [15] EN ISO 9001, Quality management systems — Requirements (ISO 9001) [Go to Page]
