Plumbing fittings
BS EN 1254-6:2021 pdf free.Copper and copper alloys一Plumbing fittings Part 6: Push-fit fttings for use with metallic tubes, plastics and multilayer pipes.
When tested according to the method in 5.16 the change in pressure shall not be greater than 0,05 bar at the conclusion of the test.
4.2.8 Leak tightness under temperature cycling
When tested according to the method in 5.32 fittings shall show no signs of leakage.
4.3 Resistance to high temperature (for heating networks)
The main aspect for the resistance to high temperature depends on the elastomeric sealing element. Therefore the elastomer shall have the appropriate characteristics as specified in EN 681-1. The elastomeric sealing elements shall conform to the requirements of EN 681-1:1996. Table 3 for continuous hot water supply up to 110 °C except for Isoprene-Isobutylene Copolymer (lIR) where a volume change in water up to and including 15 % is permitted.
4.4 Release of dangerous substances
National regulations on dangerous substances may require verification and declaration on release, and sometimes content, when construction products covered by this document are placed on those markets. In the absence of European harmonized test methods, verification and declaration on release/content should be done taking into account national provisions in the place of use.
NOTE An Informative database covering European and national provisions on dangerous substances is available at the Construction website on EUROPA accessed through: http://ec.europa.eu/growth/ tools-databases/cp-ds.
4.5 Durability
4.5.1 Durability of Internal pressure: Resistance to stress corrosion
Fittings manufactured from copper and copper-tin-zinc alloys (CuSnZnPb) shall be considered to be resistant to stress corrosion according to ENJ2502-2 and copper-zinc-silicon alloys containing 2 % Si are also considered to be resistant.
Fittings manufactured from CuZn-alloys shall be considered to be resistant to stress corrosion when the product has a hardness HBW10 2.5/62,5 110 measured according to EN ISO 6506-1 or a hardness HV 134 measured according to EN ISO 6507-1,
Fittings manufactured from copper alloys with a zinc content of 10 % or greater not mentioned above shall be tested and assessed according to 5.4.1. and shall show no evidence of cracking.
4.5.2 DurabilIty of tightness
4.5.2.1 Resistance to dezincification
The resistance to dezincification of alloy fittings can be obtained by the correct material selection and processing of that material.
Alloys containing 15 % or less zinc provide a good resistance to dezincification and don’t need to be tested.
Representative material samples, prior to machining, shall be tested. When tested according to 5A.2…1. the mean and maximum depth of dezincification in any direction shall be expressed in pam and shall meet the acceptance criteria listed below for resistance to dezincification:
— for grade A: maximum 200 lAm;
— for grade B: mean not to exceed 200 Itm and maximum not to exceed 400 pIm.
If any of the test pieces do not meet the criteria for the chosen grade, a second lot of test samples from the same batch shall be selected and the test repeated. If any of the second lot of test pieces fails, then the batch represented shall be deemed not to conform to the requirements of this document.
4.5.2.2 ResIstance to pressure cycling
When tested according to the method in 5.4.2.2 fittings shall show no signs of leakage.
4.5.3 Durability of resistance to high temperature (for heating networks)
When tested according to the method in 5A3 to one or more of the specified test durations, the compression set of the sealing element shall be expressed as a percentage.
4.6 Wall thickness at threaded portions of adaptor fittings
This requirement only applies to adaptor fittings with an interface thread.
When assessed according to the method specified in 5,5 the minimum wall thickness at the interface
thread shall be as expressed in EN 1254-20:2021, 4.1 for the relevant diameters.
4.7 Dimensions of tail pipe ends for swivel fittings
This requirement only applies to tail pipe ends for swivel fittings.
When assessed according to the method specified in 5.6 the dimensions shall be as expressed in EN 1254-20:2021,4.2 for the thread size.
4.8 Threaded end dimensions
This requirement only applies to fitting bodies with threaded ends.
When assessed according to the method specified in £1 the thread shall be in accordance with
EN 1254-20:202 1, 4.4.
4.9 Other adapter ends (not defined in EN 1254-20:202 1)
Other adapter ends, when assembled in accordance with the manufacturers instructions and pressure tested according to the method in Z shall show no signs of leakage or permanent distortion. When re-tested in accordance with the test method in 52 after disconnection and reconnection, it shall again show no signs of leakage or permanent distortion. If after disconnection the sealing element shows signs of damage, it shall be replaced before the second test.
4.10 Bore dimensions
To minimize flow resistance, minimum bore dimensions are required.
When assessed according to the method in 5, the minimum bore, including any internal tube support, shall be greater or equal to the values expressed In EN 1254-20:2021, 4.5, for the relevant nominal diameters.
Where an internal support is not required, the minimum bore of the fitting shall be greater than or equal to the mm bore of the corresponding pipe.
For unequal ended or adaptor fittings, the smallest diameter shall apply provided that this diameter does not restrict other outlets.
4.11 Identity of elastomeric sealing material
During type testing, the method in 52 shall be used to establish the master reference thermogram for the chosen sealing material.
The results of subsequent tests of the sealing material, carried out according to the method in 5.9. shall be compared to the master reference thermogram to establish that the material is the same; any differences shall be investigated. Results shall be retained for future comparison.
The identity relates to the elastomeric material and is independent of the fitting type, size or pattern.
4.12 Tube / pipe abutment
This requirement does not apply to threaded ends.
Fitting ends are usually manufactured with an abutment to limit tube or pipe insertion and to retain a loose supporting sleeve, if used.
Fittings may be produced for special purposes, particularly useful for repairs, where the fitting ends do not incorporate abutments, allowing the fitting to slide along the tube or pipe.
The dimensions of the abutment shall be such that it will stop the smallest possible tube according to EN 1057:2006+A1:2010, Table 4 or pipe. The abutment shall also satisfy the minimum bore requirement as stated in 4J.Q.
4.13 Alignment of the fitting ends
When tested according to the method in 5.10. the alignment of the fitting ends with reference to the specified axis shall be within ± 2°.BS EN 1254-6 pdf download.Plumbing fittings