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Standards Development
This document is applicable to metal banded flexible couplings for use in waste water piping systems outside the building structure and buried, under application area codes U & UD, operated under gravity and periodic hydraulic surcharge.
For applications comprising of clay pipe systems see EN 295-4.
Flexible couplings are widely used for the connection and repair of pipes without collar in waste water systems outside and inside buildings, in buried or open installations.
The flexible coupling consists of a moulded or extruded rubber sleeve with two stainless steel clamping bands with or without a stainless-steel shear band. They are usually designed straight, with graduated diameter (adaptors) or with flexible inner diameter.
Tightening the sleeve with the clamping bands on the pipes´ outer diameters forms a watertight connection. Shear bands are added to provide resistance to shear forces. The connection of pipes with large disparities in diameter can be formed by using an appropriate bush or bushes with the coupling or by using an adaptor.
The flexible couplings are intended to connect or repair pipes:
— of different materials and/or diameters;
— without collar or cut to length; e.g. for repair;
— of specific pipe systems;
— by jointing post-inserted preformed junctions and lateral connections.
The EN XXXX- consist of the following parts, under the general title Flexible Couplings for waste water systems:
- Part 1: General characteristics and requirements for systems buried & outside the building structure (this document)
- Part 2: General characteristics and requirements for systems above ground & inside the building structure (under development)
- Part 3: General characteristics and requirements of Insertable fittings (under development)
- Part 4: Assessment of conformity (under development)
This document replaces EN 16397-1: 2014 and EN 16397-2: 2014 In December 2019, TC165 launched a CIB ‘Deletion of ENs and PWIs due to overlapping scopes’.
The result of this CIB, as well as the Report of WG1 to TC165 (N 3336), were on the agenda of TC165 in November 2020.
In this meeting, Mr Niemöller explained the planned route forward as described in the WG 1 report N 3336.
After discussion, TC165 decided (DECISION 739 (62nd Meeting - 3) taken by CEN/TC 165 on 2020-11-12/13) as follows;
- to withdraw DECISION 708 (Lisbon-3) taken by CEN/TC 165 on 2019-11-08
- to delete the existing preliminary work items PWI 00165297 and PWI 00165298 accordingly by CIB
- encourages WG 1 to forward a NWIP (or PWI) to TC 165 for the revision of EN 16397 to solve the existing issue regarding overlapping scopes in EN 295-4, EN 16397-1 and EN 16397-2.
The decision was taken by unanimity.
Since then, WG 1 is working on updated versions of EN 16397-1 and -2. To avoid any miscommunication in the market, a new number is requested for this standard (not EN 16397-1).
((In parallel TC 165 is asked to launch a procedure to withdraw EN 16397-1 and EN 16397-2.))
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