bsen14540-20xxfire-fightinghoses—non-percolatinglayflathosesforfixedsystems

bsen14540-20xxfire-fightinghoses—non-percolatinglayflathosesforfixedsystems内容摘要：

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2020, and conflicting national standards shall be withdrawn at the latest by November 2020. The standard is based on remendations from CEN/TC 191 “Fixed fire fighting systems” and should be read in conjunction with EN 6712. prEN 1924 and prEN 14550 have the general title “Firefighting hoses”, prEN 1924 gives requirements for Nonpercolating layflat delivery hoses and hose assemblies for pumps and vehicles and this Standard gives requirements for “Nonpercolating layflat hoses for fixed systems”. Requirements for semirigid hoses are given in EN 1947 (pumps and vehicles) and in EN 694 (fixed systems). NOTE prEN 19242 was renumbered following enquiry to EN 14540 and prEN 19241 is now prEN 1924 At present there is no existing ISO standard on the same subject. Annexes A to E are normative. Remendations on the frequency at which tests specified in this standard should be carried out are given in annex F. This document includes a Bibliography. Users of this European Standard are advised to consider the desirability of independent certification of product conformity wi th this European Standard based on testing and continuing surveillance, which may be coupled with assessment of a supplier39。 s quality systems against EN ISO 9001. According to the CEN/CENELEC Internal Regulations, the national standards anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvi a, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14540:2020 (E) 4 Introduction A fixed system is a manually operated unit installed in a building in order to make it possible for the occupants to control and extinguish a small fire. The system consists of fixed units mounted on walls or in cabis permanently connected to a water supply. The fixed units are posed of a coupling, a valve with a pressure indicator, a layflat water filled hose with its support and a nozzle. EN 14540:2020 (E) 5 1 Scope This European Standard specifies the requirements and test methods for nonpercolating layflat hoses for fixed systems. The hoses are intended for use at a maximum working pressure of 1,5 MPa over a range of inside diameters from 25 mm to 52 mm. The standard applies exc lusively to hoses for firefighting purposes intended for use at a minimum ambient temperature of 20 176。 C in normal conditions, and a minimum temperature of 30 176。 C in colder climatic conditions. Hoses conforming to this standard should be used with fire hose couplings conforming to the relevant national standards for couplings. Hoses in marine applications and/or aggressive environments to be used with wall hydrants as specified in EN 6712 can conform to the requirements of this Standard or prEN 1924, but prEN 1924 is preferred in these applications. NOTE All pressures are gauge pressures and are expressed in megapascals1. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 28033, Rubber and plastics hoses — Determination of adhesion between ponents (ISO 8033:1991). EN ISO 1307, Rubber and plastics hoses for general purpose industrial applications — Bore diameters and tolerances, and tolerances on length (ISO 1307:1992). EN ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing (ISO 1402:1994). EN ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of dimensions (ISO 4671:1999). EN ISO 8330:2020, Rubber and plastics hoses and hose assemblies Vocabulary (ISO 8330:1998). ISO 188, Rubber, vulcanised or thermoplastic — Accelerated ageing or heat resistance tests. 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN ISO 8330:2020 and the following apply. 1 1 MPa = 10 bar EN 14540:2020 (E) 6 layflat hose hose with a soft wall which, when unpressurized internally, collapses to such an extent that the inner faces of the inside diameter make contact and the hose takes up a flat crosssectional appearance jacket circular woven seamless reinforcement 4 Materials and construction of hose The hose shall be uncovered. It shall consist of the following: an impermeable rubber or plastics lining。 a synthetic fibre jacket. NOTE 1 The hose jacket can be dyed or pigmented. NOTE 2 The hose manufacturer should weave the jacket and assemble the jacket and lining. NOTE 3 The lining should be as smooth as possible so as to minimize friction. 5 Dimensions, tolerances and maximum mass Inside diameter and maximum mass The inside diameter of the hose and tolerances when measured in accordance with EN ISO 4671 shall conform to the requirements given in Table 1. The mass per metre length for a length of hose of at least 2 m, without couplings fitted, shall not exceed the value given in Table 1. Table 1 — Inside diameter。