1、 ISO 2012 Fire protection Automatic sprinkler systems Part 3: Requirements and test methods for dry pipe valves Protection contre lincendie Systmes dextinction automatiques du type sprinkler Partie 3: Exigences et mthodes dessai des postes de contrle sous air INTERNATIONAL STANDARD ISO 6182-3 Third
2、edition 2012-12-01 Reference number ISO 6182-3:2012(E) ISO 6182-3:2012(E)ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechani
3、cal, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.o
4、rg Published in Switzerland ISO 6182-3:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Requirements 3 4.1 Nominal sizes . 3 4.2 Connections . 3 4.3 Rated working pressure 4 4.4 Bodies and covers . 4
5、 4.5 Strength (see 6.9) . 4 4.6 Access for maintenance . 5 4.7 Components . 5 4.8 Leakage (see 6.8) 5 4.9 Non-metallic components (excluding gaskets, seals and other elastomeric parts) (see 6.4 b) Explosion suppression systems (ISO 6184). An International Standard covering foam systems is planned. I
6、SO 2012 All rights reserved v Fire protection Automatic sprinkler systems Part 3: Requirements and test methods for dry pipe valves 1 Scope This part of ISO 6182 specifies performance, requirements, methods of test and marking requirements, f o r d r y p i p e v a l v e s a n d m a n u f a c t u r e
7、 r s s p e c i f i e d r e l e v a n t t r i m u s e d i n d r y p i p e a u t o m a t i c f i r e protection systems. Performance and test requirements for other auxiliary components or attachments to dry pipe valves are not covered by this part of ISO 6182. Quick opening devices, including acceler
8、ators, used with dry pipe valves are covered in 6182-4. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (inclu
9、ding any amendments) applies. ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs with specified property classes Coarse thread and fine pitch thread ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel Part
10、 2: Nuts with specified property classes Coarse thread and fine pitch thread 3 T erms an d definiti ons For the purposes of this document, the following terms and definitions apply. 3.1 alarm device mechanical or electrical device to sound an alarm upon operation of the valve 3.2 automatic drain nor
11、mally open device that automatically drains water from and vents the intermediate chamber of a valve to the atmosphere when the valve is in the ready position, and limits water flow from the chamber after the valve has tripped 3.3 clapper type of sealing element NOTE See also 3.18. 3.4 corrosion-res
12、istant material metallic material of bronze, brass, Monel 1)metal, austenitic stainless steel, or equivalent, or plastic material conforming with the requirements of this part of ISO 6182 1) Monel is an example of a suitable product available commercially. This information is given for the convenien
13、ce of users of this part of ISO 6182 and does not constitute an endorsement by ISO of this product. INTERNATIONAL ST ANDARD ISO 6182-3:2012(E) ISO 2012 All rights reserved 1 ISO 6182-3:2012(E) 3.5 differential ratio of service pressure to system air pressure (expressed as gauge pressures) at the tri
14、p point NOTE See also 3.24. 3.6 differential-type valve type of valve in which air pressure in the system acts directly and/or indirectly on the sealing assembly to maintain it in the closed position NOTE The air seat of the sealing assembly is of equal or larger diameter than the diameter of the wa
15、ter seat of the sealing assembly, with the two separated by an intermediate chamber maintained at atmospheric pressure. 3.7 dry pipe system automatic fire protection system in which the piping contains air or nitrogen under pressure, the release of which allows water from a water supply to discharge
16、 through the system 3.8 dry pipe valve valve that controls the flow of water into a dry pipe sprinkler system and incorporates provision for actuation of an alarm under specified conditions 3.9 f low v el o c it y speed of water flow through a valve expressed as the equivalent water velocity through
17、 a pipe of the same nominal size as the valve 3.10 intermediate chamber that part of a valve which separates the air and/or water sealing assembly seating surfaces and is at atmospheric pressure when the valve is in the ready condition 3.11 leak point system air pressure for a specific service press
18、ure at which water begins to flow from the intermediate chamber, automatic drain valve or alarm connection 3.12 mechanical-type valve type of valve in which the air pressure in the system acts on the sealing assembly and linking mechanism to maintain it in the closed position 3.13 minimum opening pr
19、essure minimum pressure when water begins to pass through the valve 3.14 priming water water used to seal a sealing assembly and prevent cementation of working parts 3.15 rated working pressure maximum service pressure at which a valve is intended to operate 3.16 ready (set) condition state of a val
20、ve with the sealing assembly in the closed or set position with service and system pressure applied2 ISO 2012 All rights reserved ISO 6182-3:2012(E) 3.17 reinforced elastomeric element element of clapper, clapper assembly or seat seals in a composite of an elastomeric compound with one or more other
21、 components 3.18 sealing assembly main movable sealing element (such as a clapper or diaphragm) of the valve which prevents the reverse flow of water and which maintains air pressure in the system piping 3.19 sealing assembly seat ring main fixed sealing element of a valve which prevents the reverse
22、 flow of water and which maintains air pressure in the system piping 3.20 service pressure static water pressure at the inlet to a valve when the valve is in the ready condition 3.21 system air pressure static air pressure in the system piping when the valve is in the ready condition 3.22 system pre
23、ssure static water pressure at the main outlet of a valve when the valve is in the ready condition 3.23 trim external equipment and pipework, excluding the main installation pipework, fitted to valve installation assembly 3.24 trip point point at which a valve operates, admitting water into the syst
24、em, measured in terms of the system air pressure at a given service pressure 3.25 water motor alarm hydraulically driven device which provides a local audible alarm as a result of a flow through a valve 4 Requirements 4.1 Nominal sizes The nominal size of a valve shall be the nominal diameter of the
25、 inlet and outlet connections, i.e. the pipe size for which the connections are intended. Sizes shall be 40 mm, 50 mm, 65 mm, 80 mm, 100 mm, 125 mm, 150 mm, 200 mm, 250 mm or 300 mm. The diameter of the waterway through the sealing assembly seat ring may be less than the nominal size. 4.2 Connection
26、s 4.2.1 All connections shall have been designed for use at the rated working pressure of the valve. 4.2.2 The dimensions of all connections shall conform with the applicable requirements of International Standards. If International Standards are not applicable, national standards shall be permitted
27、 to be used. 4.2.3 An opening not smaller than 15 mm nominal diameter shall be provided for an alarm line connection. ISO 2012 All rights reserved 3 ISO 6182-3:2012(E) 4.2.4 If priming water is required to seal the downstream side of the sealing assembly, an external means shall be provided to intro
28、duce the priming water. 4.2.5 Means shall be provided to prevent or drain water columning and to check the level of priming water (if required). 4.2.6 Suitable means shall be provided to facilitate testing of alarms without tripping the valve. 4.2.7 For differential-type valves, suitable means shall
29、 be provided to vent water from the intermediate chamber and to prevent a partial vacuum between the upstream and downstream sealing elements of the sealing assembly. 4.3 Rated working pressure 4.3.1 The rated working pressure shall be not less than 1,2 MPa (12 bar). 4.3.2 Inlet and outlet connectio
30、ns shall be permitted to be machined for lower working pressures to match installation equipment provided the valve is marked with the lower working pressure. See 7.3 f). 4.4 Bodies and covers 4.4.1 The body and cover shall be made of a material having corrosion resistance at least equivalent to cas
31、t iron. 4.4.2 Cover fasteners shall be made of steel, stainless steel, titanium, or other materials with equivalent physical and mechanical properties. 4.4.3 Non-metallic materials other than gaskets, diaphragms and seals or metals with a melting point less than 800 C shall not form part of the valv
32、e body or cover. 4.4.4 It shall not be possible to assemble the valve with the cover plate in a position which either improperly indicates flow direction or prevents proper operation of the valve. 4.5 Strength (see 6.9) 4.5.1 An assembled valve, with the sealing assembly blocked open, shall withstan
33、d, without rupture, an internal hydrostatic pressure of four times the rated working pressure for a period of 5 min, when tested as specified in 6.9. 4.5.2 If the test in accordance with 6.9 is not done with standard production fasteners, the supplier shall provide documentation showing that the cal
34、culated design load of any standard production fastener, neglecting the force required to compress the gasket, does not exceed the minimum tensile strength specified in ISO 898-1 and ISO 898-2, when the valve is pressurized to four times the rated working pressure. The area of the application of pre
35、ssure shall be calculated as follows. a) If a full-face gasket is used, the area of application of pressure is that extending out to a line defined by the inner edge of the bolts. b) If an “O”-ring seal or ring gasket is used, the area of application of force is that extending out to the center line
36、 of the “O”-ring or gasket.4 ISO 2012 All rights reserved ISO 6182-3:2012(E) 4.6 Access for maintenance Means shall be provided to permit access to working parts and removal of the sealing assembly. Any method adopted shall permit ready maintenance by one person with a minimum of down time. 4.7 Comp
37、onents 4.7.1 Any component which may normally be disassembled during servicing shall be designed so that it can not be reassembled improperly without providing an external visual indication, when the valve is returned to service. 4.7.2 With the exception of valve seats, all parts intended for field
38、replacement shall be capable of being disassembled and reassembled using tools normally employed by the trade. 4.7.3 All components shall be non-detachable during normal operation of the valve. 4.7.4 Failure of the sealing assembly diaphragms or seals shall not prevent the valve from opening. 4.7.5
39、Sealing surfaces of sealing assemblies, including the sealing assembly seat ring, shall have corrosion resistance equivalent to brass or bronze and have sufficient width of surface contact to withstand ordinary wear and tear, rough usage, compression stresses and damage due to pipe scale or foreign
40、matter carried by the water. 4.7.6 Springs and diaphragms shall not fracture or rupture during 5 000 cycles of normal operation, when tested in accordance with 6.2. 4.7.7 There shall be no sign, on visual examination, of damage to the sealing assembly after testing for the operational requirements o
41、f 4.14 in accordance with 6.11 and 6.12. 4.7.8 When wide open, the sealing assembly shall bear against a definite stop. The opening of the valve or the reaction of the water shall not permanently twist, bend or fracture valve parts. 4.7.9 Where rotation or sliding motion is required, the part or its
42、 bearing shall be made of a corrosion- resistant material. Materials lacking corrosion resistance shall be fitted with bushings, inserts or other parts made of corrosion-resistant materials at those points where freedom of movement is required. 4.7.10 A valve having a differential of the sealing ass
43、embly exceeding 1,16 to 1 for a service pressure range of 0,14 MPa (1,4 bar) to rated working pressure shall be provided with an anti-seat latch that prevents the valve from resetting automatically. The valve shall require manual means to return the valve to the ready (set) condition. It shall not b
44、e possible to return the valve to the ready (set) condition before draining the pipe work. 4.7.11 A valve having a differential of 1,16 to 1 or less over a service pressure range of 0,14 MPa (1,4 bar) to rated working pressure shall be provided with means to prevent the valve from automatically retu
45、rning to the ready (set) condition and to permit draining of the pipework after the valve has tripped. Manual or external means shall be provided to return the valve to the ready (set) condition. 4.8 Leakage (see 6.8) 4.8.1 There shall be no leakage, permanent distortion or rupture of a valve, when
46、an internal pressure of twice the rated working pressure is applied for 5 min with the sealing assembly open in accordance with 6.8.1. 4.8.2 No leakage shall be permitted across the sealing assembly into the intermediate chamber or into the alarm port, when tested in accordance with 6.8.2. There shall be no leakage, permanent distortion or ISO 2012 All rights reserved 5
