ISO 14246 pdf download

ISO 14246 pdf download.Transportable gas cylinders — Gas cylinder valves — Manufacturing tests and inspections 1 Scope This Standard specifies the requirements for tests and inspections of gas cylinder valves at time of manufacture. This Standard is applicable to valves to be fitted to industrial and medical gas cylinders, up to 1 50 l water capacity, intended to convey compressed, liquefied or dissolved gases. This Standard is only applicable to valves operated by a hand wheel or a key. This Standard is not applicable to valves for breathing equipment, fire extinguishers, cryogenic equipment and liquefied petroleum gas (LPG). 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). 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply : 3.1 shift period of continuous work not exceeding one day 3.2 batch a quantity of valves of the same design, comprising either the production of one shift or 1 000 valves, whichever is the smaller 3.3 working pressure (p w ) settled pressure, at a uniform temperature of 1 5 °C, for a full gas cylinder 3.4 valve test pressure (p vt ) for compressed gases:p vt = 1 ,2 p w For liquefied gases and dissolved gases under pressure (for example, acetylene), p vt is at least equal to the minimum test pressure of the cylinder quoted in the relevant transportation regulation for that gas or gas group, taking account of the actual filling ratio to be used. NOTE : Transportation regulations sometimes offer a choice of filling ratio together with appropriate minimum test pressures. Generally, p vt will be the highest of these minimum test pressures for the gas, but in circumstances where a lower filling ratio is to be used, p vt may be an appropriate lower test pressure. 4 Manufacturing tests and inspections 4.1 General Manufacturing tests and inspections shall include : – routine manufacturing checks (to be performed on every valve) ; – batch acceptance tests ; – revalidation tests. 4.2 Routine manufacturing checks The...