BS ISO 6002:2021 pdf download – Industrial valves — Bolted bonnet steel gate valves
This document specifies the requirements for bolted bonnet steel gate vales having the following features:
— bolted bonnet;
— outside screw and yoke;
— inside screw (alternative for PN 10, PN 16, Class 150, PN 25 and PN 40 only);
— single or double obturator;
— wedge or parallel seating;
— with or without non-metallic obturator or seat seals;
— flanged or butt-welding ends.
It covers valves of the nominal sizes DN:
— 10; 15; 20; 25; 32; 40; 50; 65; 80; 100; 125; 150; 200; 250; 300; 350; 400; 450; 500; 600; 700; 800;
900; 1 000;
corresponding to nominal pipe sizes NPS:
— ⅜; ½; ¾; 1; 1 ¼; 1 ½; 2; 2 ½; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20; 24; 28; 32; 36; 40;and applies to valves of the following pressure designations:
— PN 10; 16; 25; 40; 63; 100;
— Class 150; 300; 600.
This document applies to bolted bonnet steel gate valves used for all industrial applications.
Additional requirements given in the relevant application standards can apply to bolted bonnet steel gate valves used for more specific applications (e.g. for the water industry, the chemical and petrochemical process industry, the oil and gas industry).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4991, Steel castings for pressure purposes
ISO 5208, Industrial valves — Pressure testing of metallic valves
ISO 5210, Industrial valves — Multi-turn valve actuator attachments
ISO 5752, Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions
ISO 9327 (all parts), Steel forgings and rolled or forged bars for pressure purposes — Technical delivery conditions
ISO 9328-1, Steel flat products for pressure purposes — Technical delivery conditions — Part 1: General requirements
ISO 9328-2, Steel flat products for pressure purposes — Technical delivery conditions — Part 2: Non-alloy and alloy steels with specified elevated temperature properties
ISO 9328-3, Steel flat products for pressure purposes — Technical delivery conditions — Part 3: Weldable fine grain steels, normalized
ISO 9328-4, Steel flat products for pressure purposes — Technical delivery conditions — Part 4: Nickelalloy steels with specified low temperature properties
ISO 9328-5, Steel flat products for pressure purposes — Technical delivery conditions — Part 5: Weldable fine grain steels, thermomechanically rolled
ISO 14737, Carbon and low alloy cast steels for general applications
EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 1: Steel flanges
EN 12982, Industrial valves — End-to-end and centre-to-end dimensions for butt welding end valves
EN 12516-1, Industrial valves — Shell design strength — Part 1: Tabulation method for steel valve shells
EN 12516-2, Industrial valves — Shell design strength — Part 2: Calculation method for steel valve shells
ASME B16.10, Face-to-Face and End-to-End Dimensions of Valves
ASME B16.34, Valves Flanged, Threaded, and Welding End
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
nominal size
DN
NPS
alphanumeric designation of size for components of a pipework system, which is used for reference purposes, comprising the letters DN or NPS followed by a dimensionless number indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections
Note 1 to entry: The number following the letters DN or NPS does not represent a measurable value and is not used for calculation purposes except where specified in the relevant standard.
Note 2 to entry: See ISO 6708 and ASME B16.34.
4 Pressure/temperature ratings
4.1 The pressure/temperature ratings shall be in accordance with EN 12516-1 for PN-designated valves and in accordance with ASME B16.34 for Class-designated valves.
4.2 The temperature shown for a corresponding pressure rating is the temperature of the pressure- containing shell of the valve. In general, this temperature is the same as that of the contained fluid. The use of a pressure rating corresponding to a temperature other than that of the contained fluid is the responsibility of the user.
4.3 For temperatures below the lowest temperature listed in the pressure/temperature rating tables, the working pressure shall not be greater than the pressure stated for the lowest listed temperature. The use of valves at lower temperatures is the responsibility of the user. Consideration should be given to the loss of ductility and impact strength of many materials at low temperature.