Reaffirmed 2018

NATIONAL FOREWORD

This Indian Standard (Part 4) which is identical with ISO 10524-4 : 2008 ‘Pressure regulators for use with medical gases — Part 4: Low-pressure regulators’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Anaesthetic, Resuscitation and Allied Equipment Sectional Committee and approval of the Medical Equipment and Hospital Planning Division Council.

This standard is published in four parts. The other parts of this series are:

Part 1 Pressure regulators and pressure regulators with flow-metering devices

Part 2 Manifold and line pressure regulators

Part 3 Pressure regulators integrated with cylinder valves A low-pressure regulator is used to reduce the pressure in a medical gas pipeline system to a lower pressure suitable for use with medical equipment or for delivery of gas directly to a patient.

These functions cover a range of inlet and outlet pressures and flows which require specific design characteristics. It is important that the operating characteristics of low-pressure regulators are appropriately specified for their intended use and then tested in a defined manner.A low-pressure regulator may be coupled to a device that controls the flow, such as, a flow control valve or a fixed orifice. The flow can be indicated by a flowmeter or by a flowgauge.

It is essential that regular inspection and maintenance are undertaken to ensure that low-pressure regulators continue to meet the requirements of this standard.

This standard pays particular attention to:

— safety (mechanical strength, leakage, safe relief of excess pressure and resistance to ignition)

— suitability of materials

— gas specificity

— accuracy

— cleanliness

— testing

— marking

— information supplied by the manufacturer

Annex B contains rationale statements for some of the requirements of this standard. The clauses and subclauses marked with an asterisk (*) after their number have corresponding rationale contained in Annex B, included to provide additional insight into the reasoning that led to the requirements and recommendations that have been incorporated in this standard. It is considered that knowledge ofthe reasons for the requirements will not only facilitate the proper application of this standard, but will expedite any subsequent revisions.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.