IS 13432-1 (1992): Gas leak detector for use with low pressure
Contents
1. 2305 2501 2643 Part 1 1975 1989 1986 1985 1975 1981 1982 1988 1985 ANNEX A Clause 2 LIST OF REFERRED INDIAN STANDARDS Title Free cutting brass rods and sections Specification fourth revision Cold rolled low carbon steel sheets and strips third revision Dimensions for pipe threads where pressure tight joints are required on the threads third revision Aluminium and aluminium alloys ingots and castings for general engineering purposes second revision Zinc base alloy die castings second revision Solid drawn copper alloy tubes for condenser and heat exchan gers second revision Method for mercurous nitrate test for copper and copper alloys first revision Copper tubes for general engineering purposes second FEVisions y Dimensions for pipe threads for fastening purposes Part 1 Basic profile and dimensions first revision IS No 3168 1981 Title Brass strip and foil for deep drawing first revision 3400 Method of test for vulcanized Parts 1to 10 rubbers 4218 Parts 1 to4 1976 4454 Part 3 Steel wires for cold formed 1975 springs Part 3 Oil hardened and tempered steel wires alloyed first revision ene Part4 Steel wires for cold formed springs Part 4 Stainless spring steel wire for normal corrosion resistance first revision 1SO metric screw threads 5116 1985 General requirements2. 30 gf cm and with the appliance The indicator shall show Leak when the time taken between successive bubbles is less than 25 seconds The indicator shall not show Leak when the time taken between successive bubbles is more than 25 seconds Amend No 1 to IS 13432 Part 1 1992 5 6 The dial shall indicate the words Normal and Leak so that the consumer gets instant indication for preventive action Normal and Leak indication may also be indicated by green and red colours respectively 5 7 Each leak indicator shall be supplied with an user s manual giving all the details for installation principle of working method of operation for finding the leak and the following limitations a Does not locate the leak b Does not prevent the leak c Does not give audible alarm d Does not indicate leak when the appliance is in operation e Works only under the specified procedures f Calibration at a pressure of 2 942 kN m 30 gf cm and g Leakage indication according to the time mentioned in this manual Page 3 clause 7 2 Delete Page 4 Annex A Insert the following Annex at Ihe end ANNEX B Clause 5 5 METHOD OF TEST FOR SENSITIVITY OF LEAK INDICATOR B 1 Procedure B 1 1 Test the Appliance for Sensitivity by the Following Method B 1 1 1 Subject the appliance to be tested to an air supply at a pressure of 2 942 Nim 30 affem with the bubble leak indicator see
3. Fig 1 in the air supply line Adjust the time between two successive bubbles as 25 seconds by creating an artificial leak through needle valve or any other device Cut off the air supply to the appliance to confine system pressure Then observe the indication in the gas leak indicator Amend No 1 to IS 13432 Part 1 1992 6mm ID GLASS TUBING 25mm FIG 1 BUBBEL LEAK INDICATOR HMD 23 i Reprography Unit BIS New Delhi India
4. for domestic and commerial equip ment for use with LPG second revision 7608 1987 Phosphor bronze wire for general engineering purposes first revision 8119 1976 9798 1981 Copper brazed steel tubing Specification for low pressure regulators for we with LEG mixtures 10773 1983 Copper tubes for refrigeration purposes Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act 1986 and the Rules and Regulations made thereunder The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection testing and quality control which is devised and supervised by BIS and operated by the producer Standard marked products are also continuously checked by BIS for conformity to that standard as a further safeguard Details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian Standards Bureau of Indian Standard BIS is a statutory institution established under the Bureau of Indian Standards Act 1986 to promote harmonious development of the activities of standardization marking and quality certification of goods and attending to connected matters in the country Copyright BIS has the copyright of all its publications No part
5. 2 hours meet the require ments tabulated in Appendix D of IS 9798 1981 After this test change in hardness value from before to after the test shall not exceed 15 IRHD see IS 3400 Part 2 1980 NOTE The test at 3 5 1 to 3 5 5 are work batch tests On initial selection of a diaphragm material it shall also be tested in test gas in vapour phase for 72 hours and shall not show a weight or volume change greater ihan 15 percent 4 CONSTRUCTION AND WORKMANSHIP 4 1 The construction of all the parts of detector shall be of high standard of workmanship and finish The construction shall ensure durability with leak tight joints wherever applicable and shall comply with 6 of this standard 4 2 All gas carrying joints shall be leak tight and resistive to a temperature of 120 C 4 3 Screw threads if provided shall comply with the requirements of IS 554 1985 or IS 2643 Part 1 1975 or IS 4218 Parts 1 to 4 4 4 Gas leak detector for retrofitting with gas burning appliance shall have inlet and or outlet nozzle conforming to 17 1 and 17 2 of IS 5116 1985 4 5 The gas carrying parts of the detectors shall be tested with a air pressure of 14 71 kPa approximately 150 gf cm and shall not show any leakage 4 6 All nuts bolts and fittings having spanner flats shall by capable of being tightened or slackened by suitable spanner or be readily accessible to an adjustable spanner 5 GENERAL 5 1 The detector shal
6. A k k k 22 2 2 22 222222 Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities in order to promote transparency and accountability in the working of every public authority and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public particularly disadvantaged communities and those engaged in the pursuit of education and knowledge the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public Tat FT ER Se aT aa qua Al Ble AT arm Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru The Right to Information The Right to Live Step Out From the Old to the New IS 13432 1 1992 Gas leak detector for use with low pressure liquefied petroleum gas burning appliances Part Mechanical type MED 23 Domestic and Commercial Gas Burning Appliances Satyanarayan Gangaram Pitroda Bhartrhari Nitisatakam kk 2 2 2 2 2 22 2 2 22 22 BLANK PAGE PROTECTED BY COPYRIGHT IS 13432 Part 1 1992 Reaffirmed 2002 una Aah aqata afaa dettaaa Ta aga afaa aa ward de Fara aaa fafarfez am 1 ailas SET Indian Standard GAS LEAK DETECTOR FOR USE WITH LOW PRESSURE LIQ
7. PAL BHUBANESHWAR COIMBATORE FARIDABAD GHAZIABAD GUWAHATI HYDERABAD JAIPUR KANPUR LUCKNOW PATNA THIRUVANANTHAPURAM E 38 43 5316 40 Southern C 1 T Campus IV Cross Road MADRAS 600113 Printed at Printwell Printers Aligarh India AMENDMENT NO 1 SEPTEMBER 1996 TO IS 13432 Part 1 1992 GAS LEAK DETECTOR FOR USE WITH LOW PRESSURE LIQUEFIED PETROLEUM GAS BURNING APPLIANCES SPECIFICATION PART 1 MECHANICAL TYPE First cover page and page 1 Substitute the following for the existing title GAS LEAK INDICATOR FOR USE WITH LOW PRESSURE LIQUEFIED PETROLEUM GAS BURNING APPLIANCES SPECIFICATION PART 1 MECHANICAL TYPE All pages General Substitute word indicator for detector wherever appears Second cover page Foreword Insert the following after fourth para At present the products covered under this standard shall be certified along with the appliance and individual product certification shall be considered later Page 1 clause 3 5 last line Substitute 3 5 5 for 3 5 6 Page 2 clause 4 4 Delete Page 2 clause 5 2 first line Delete the words For integral fitment model Page 2 clause 5 5 Substitute the following for the existing 5 5 Sensitivity of Leak Indicator The indicator shall be capable of detecting a leak of one bubble per 25 seconds when tested according to Annex B at a pressure of 2 942 KN m
8. UEFIED PETROLEUM GAS BURNING APPLIANCES SPECIFICATION PART 1 MECHANICAL TYPE UDC 614 842 435 654 924 553 O BIS 1992 BUREAU OF INDIAN STANDARDS MANAK BHAVAN 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 April 1992 Price Group 2 Domestic and Commercial Gas Burning Appliances Sectional Committee HMD 23 FOREWORD This Indian Standard Part 1 was adopted by the Bureau of Indian Standards after the draft finalized by the Domestic and Commercial Gas Burning Appliances Sectional Committee had been approved by the Heavy Mechanical Engineering Division Council Liquefied petroleum gases LPG produced and marketed in India generally cenform to IS 4576 1978 Specification for liquefied petroleum gases first revision Y and designated as Commercial Butane Propane Mixture LPG is colourless odourless and being highly inflam mable a malodourant foul smell is added to detect gas leakage The gas is twice as heavy as air and can form explosive mixture with air even in very small concentrations In view of the above and other safety related properties some simple rules code need be observed for its safe operation installation Because the rules are simple they are neglected Failure to observe these rules may lead to accidents of varying intensity The use of LPG in individual household has been widely expanding and protection of consumers from the hazards arising during installation and operation is of vital interest Leak det
9. eason cracking test when tested according to the method specified in IS 2305 1988 3 4 Non metallic materials normally in contact with the gas shall not swell more than 15 per cent of the volume after being immersed in pentane or LP Gas for 72 hours at room tem perature when tested according to Annex B of IS 5116 1985 3 5 The material of diaphragm if provided shall be of synthetic rubber or any other suitable material and if it is rubber shall satisfy the requirements given in 3 5 1 to 3 5 6 3 5 1 The material shall be free from porosity pits and foreign particles and shall have a smooth non tacky surface with minimum talc or bloom 3 5 2 The material shall not show change of more than 10 IRHD when subjected to the accelerated ageing test described in 3 or4 of IS 3400 Part 4 1987 IS 13432 Part 1 1992 3 5 3 The material shall be such that when an assembled gas leak detector is subjected toa pressure up to 150 kPa 1 5 kgf cm from the side subjected to pressure while normal working the diaphragm shall not pull out or burst 3 5 4 The material shall be capable of with standing a clamping pressure of 98 kPa 1 kgf cm where by the material itself or the substance with which the fabric layer has been impregnated shall not be pressed away flowed away or be bruised or otherwise damaged 3 5 5 The material shall after immersion in pentane or test gas as defined in Appendix A of IS 9798 1981 for 7
10. ecessary adjuncts to this standard SECTION 1 MATERIALS AND CONSTRUCTION 3 MATERIAL AND COMPONENTS 3 1 Components and parts that may come in contact with LPG shall be manufactured from or be tre ted with materials compatible with LPG as wellas be unaffected by chemical or thermal influences that may be encountered in normal use For guidance some appropriate materials are specified in table below but other type of materials may be used provided that the standards of performances durability and safety of gas leak detectors are not lowered 3 2 Typical materials of various parts ofthe detector are shown below Component Material Body Zinc alloy see IS 742 1981 Aluminium alloy see IS 617 1975 Cover Aluminium alloy see IS 617 1975 Engineering plastics Rubber parts LPG resistant rubber Plastic parts Engineering plastics MECHANICAL TYPE Component Brass parts Material Free cutting brass see IS3i gt 1989 Springs Stainless steel see IS 4454 Part 4 1975 Spring steel see IS 4454 Part 3 1975 Phosphor bronze see IS 7608 1987 Sheet metal Cold rolled steel see IS 513 parts 1986 Brass sheet see IS 3168 1981 Gears Steel surface treated for corro sion resistance Brass see IS 319 1989 Engineering plastics Tubes see IS 1545 1982 IS 2501 1985 IS 8119 1976 and IS 10773 1983 3 3 All copper and copper alloy parts shall pass the mercurous nitrate test s
11. ector is a device used for detecting locating or measuring or combination thereof This standard Part 1 lays down the requirements of mechanically operated Gas Leak Detectors used with LPG burning appliances Electronically operated Gas Leak Detectors are also available in the country and for covering their requirements a separate standard Part 2 is under preparation For the purpose of deciding whether a particular requirement of this standard is complied with the final value observed or calculated expressing the result of a test or analysis shall be rounded off in accordance with IS 2 1960 Rules for rounding off numerical values revised Y The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard IS 13432 Part 1 1992 Indian Standard GAS LEAK DETECTOR FOR USE WITH LOW PRESSURE LIQUEFIED PETROLEUM GAS BURNING APPLIANCES SPECIFICATION PART 1 1 SCOPE 1 1 This standard specifies materials construc tion performance and testing requirements for gas leak detectors of mechanical type for use with low pressure 2 942 kN m 30 gf cm nominal gas inlet pressure liquefied petroleum gas burning appliances 1 1 1 For convenience this standard has been divided in two sections as follows Section 1 Material and construction Section 2 Performance and testing require ments 2 REFERENCES The Indian Standards listed in Annex A are n
12. is test the detector shall meet the requirements of 6 1 8 2 For batch acceptance tests the number cycles shall be 20 000 8 3 The purpose of the test is to evaluate the quality of various flexibles such as diaphragm and spring vis a vis retention of critical properties relevant to function resistance to deformation degradation loss of flexibility under condition of flexing and unflexing This test does not purport to check any mechanical requirements of the construction assembly and should not be taken as representative of actual IS 13432 Part 1 1992 service conditions and could introduce impro per parameters of assessment of non flexibles The test should relate only to the flexibles referred to above 9 TESTING OF THE DETECTOR Each leakage detector shall be tested for its calibration by creating an artificialknown leak by suitable method to check sensitivity accord ing to 5 5 10 MARKING 10 1 Detector shall be clearly and permanently marked with the following a Manufacturer s name initials or regis tered trade mark b Number of this standard c The words For use with liquefied petro leum gases at 2 942 kN m 30 gf cm nominal pressure and d Any other markings agreed to between the purchaser and the manufacturer 10 1 1 BIS Certification Marking Details available with the Bureau of Indian Standards IS 13432 Part 1 1992 IS No 319 513 554 617 742 1545
13. l be so designed that when fitted on the LPG burning appliance there shall not by any obstruction or protrusion beyond the normal protrusion of knobs and other controls of the appliance 2 5 2 For integral fitment model the gas leak detector shall have provision for fitting to gas rail of gas burning appliances so as to give a leak tight and durable joints 5 3 After fitting the detector on the gas burning appliance there shall be no change in the normal operation of the gas burning appliances The device shall function with the normal pressure available in the gas rail The detector thus fitted for leak detection shall not change any of the existing requirements of relevant appliance standards 5 4 The gas leak detector when mounted with the appliance shall detect leak from entire low pressure installation connected to the appliance 5 5 The detector shall also be capable of detec ting a leakage of minimum 4 mm sec from the system to the atmosphere at 2 942 kN m 30 gf cm pressure SECTION 2 PERFORMANCE AND TESTING REQUIREMENTS 6 GAS SOUNDNESS 6 1 The detectors shall be tested for gas sound ness at the room temperature by the following method Subject the detector to be tested to an air pressure of 1471 kPa approx 150 gf cm with the bubble leak indicator see Fig 6 of IS 5116 1985 in the air supply line Examine the bubble indicator for the success ive bubbles The time taken between success ive bubbles
14. of these publications may be reproduced in any form without the prior permission in writting of BIS This does not preclude the free use in the course of implementing the standard of necessary details such as symbols and sizes type or grade designation Enquiries relating to copyright be addressed to the Director Publications BIS Revision of Indian Standards Indian Standards are reviewed periodically and revised when necessary and amendments if any are issued from time to time Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition Comments on this Indian Standard may be sent to BIS giving the following reference Doc Nos HMD 23 0060 Amendments Issued Since Publication Amend No Date of Issue Text Affected BUREAU OF INDIAN STANDARDS Headquarters Manak Bhavan 9 Bahadur Shah Zafar Marg New Delhi 110002 Telephones 331 O1 31 331 13 75 Telegrams Manaksanstha Common to all Offices Regional Offices Telephone Central Manak Bhavan 9 Bahadur Shah Zafar Marg 331 01 31 NEW DELHI 110002 31 13 75 Eastern 1 14 C I T Scheme VII M V I P Road Maniktola 378499 3785 61 CALCUTTA 700054 37 86 26 3785 62 Northern SCO 445 446 Sector 35 C CHANDIGARH 160036 53 23 84 41 2442 412519 412315 4129 16 Western Manakalaya E9 MIDC Marol Andheri East 632 92 95 63 27 80 BOMBAY 400093 Jo 78 92 Branches AHMADABAD BANGALORE BHO
15. shall not be less than one minute 6 1 1 Resistance to High Temperature The gas leak detector is exposed to a tempera ture of 120 C for a minimum period of 30 minutes for the complete unit to attain this temperature It is then removed and left exposed to the atmosphere until the assembly returns to ambient conditions after which it is tested according to 6 1 6 1 2 Resistance to Low Temperature The gas leak detector is exposed to a tempera ture of 20 C for a minimum period of 30 minutes for the detector to attain this tempera ture Itis then removed and left exposed to the atmosphere until the assembly returns to ambient conditions after which it is tested according to 6 1 7 SURFACE TEMPERATURES 7 1 The detector when fittted with the appliance shall be fitted at a place where the temperature does not reach 120 C during normal working conditions 7 2 No part of the retrofitted detector with the appliance using rubber tubing shall exceed a temperature of 65 C after 2 hours of normal working of the appliance 8 CYCLE TEST ENDURANCE TEST 8 1 When assessing a new design a type approval test in the form of a ON OFF cycle test of the gas leak detector shall be carried out For the purpose of this standard one cycle means pressurizing the detector to 2 942 kN m 30 gf cm and releasing A fully assembled gas leak detector unit shall stand a minimum of 100 000 cycles of sensor indicator operations After th
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