6554 International Standard (TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOHAR OPFAHM3ALWA IO CTAHAAPTM3AUWMGORGANISATION INTE RNATIONALE DE NORMALISATION Flanged automatic steam traps - Face-to-face dimensions Purgeurs automatiques de vapeur d'eau, a brides - Dimensions face-a-face First edition -- 1980-06-15 UDC 621.186.6 Ref. No. ISO 6554-1980 (E) ISO 6554-1980 (E) Descriptors : safety valves, flanged valves, steam, traps, dimensions. Price based on 1 page without license from IHS Not for Resale Foreword national standards institutes (lsO member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member and non-governmental, in liaison with Iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard iSO 6554 was developed by Technical Committee ISO/TC 153, General purpose industrial valves, and was circulated to the member bodies in March 1979. Australia Germany, F. R. South Africa, Rep. of India Sweden Belgium Brazil Italy Switzeriand United Kingdom Canada Kores, Rep. of Netherlands USA Chile Norway Denmark USSR Finland Poland France Romanie The member bodies of the following countries expressed disapproval of the document on technical grounds : Czechoslovakia Japan International Organization for Standardization,1980 Printed in Switzerland Not for Resale without license from IHS 1SO 6554-1980 (E) INTERNATIONAL STANDARD Flanged automatic steam traps -- Face-to-face dimensions Scope and field of application These figures apply only to the steam traps themseives, and not to the whole assembly (accessories included) as installed in This International Standard specifies face-to-face dimensions the pipeline. for a range of automatic steam traps used in flanged pipe systems. Definitions 2 2.1 nominal size (DN)1) : Numerical designation of size which is common to all components in a piping system other than components designated by outside diameters. It is 8 convenient round number used for reference purposes, and it is Table -- Face-to-face dimensions only loosely related to manufacturing dimensions. It is designated by the letters DN, foilowed by a number. FTF series DN 2* 4* 3 5 1 6 no 2.2 face-to-face dimension : The distance, expressed in 15 150 170 210 230 290 480 millimetres, between the two planes, perpendicular to the trap 20 axis, located at the extremities of the body end ports. 25 160 210 230 310 380 580 (32) 350 450 3 Dimensions 40 230 270 320 420 490 680 50 500 560 The six basic series of face-to-face dimensions for flanged These two series apply only to models already existing. automatic steam traps, expressed in milimetres, are given in the table for the nominal sizes ranging from DN 15 to DN 50 E -- The nominal size presented between brackets in this tabie, NOTE inclusive, and for pressures to PN 40 inclusive. (DN 32), is retained on a provisional basis and for a limited time. 1) in accordance with iso 6708, at present at the stage of draft. 1 license with IS nitted without license from IHS Not for Resale