DOCUMENT DESPATCH ADVICE Ref: MED 16 :1/T- 6 Date:
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1 RAFT TANAR IN WIE IRUATION OUMENT EPATH AVIE Ref: ME 16 :1/T- 6 ate: Gas ylinders, ectional ommittee, ME 16 TO: a) The interested members of Mechanical Engineering ivision ouncil, ME b) All members of Gas ylinders ectional ommittee, ME 16 and Valves and Fittings Gas ylinders ub ommittee, ME 16:1, ow Pressure Gas ylinders ubcommittee, ME 16:2 and issolved Acetylene ylinders, Generators, Acetylene Pipe ines And High Pressure Gas ylinders ubcommittee, ME 16:3 c) All others interested ear ir(s), Please find enclosed the following documents: oc. No. ME 16 (1368) TITE Inspection gauges for checking type IV (size 1, 2, 3) taper threads of gas cylinder valve & cylinder necks pecification (First Revision of I: 722) (I ) Kindly examine the raft standard and forward your views stating any difficulties which you are likely to experience in your business or profession, if this is finally adopted. ast date for receipt of comments: omments, if any, may please be made in the format as given overleaf and ed to the undersigned at the above address. In case no comments are received or comments received are of editorial nature, you will kindly permit us to presume your approval for the above document as finalized. However, in case of comments of technical in nature are received then it may be finalized either in consultation with the hairman, ectional ommittee or referred to the ectional committee for further necessary action if so desired by the hairman, ectional ommittee. The document is also hosted on BI website Thanking you, Yours faithfully (T.V ingh) Encl: As above c F & Head (ME), ROOM NO: 23 MANAK BHAVAN 9 BAHAUR HAH ZAFAR MARG NEW EHI 112 TEEFAX med@bis.org.in
2 FOR BI UE ONY February 215 raft Indian tandard INPETION GAUGE FOR HEKING TYPE IV (IZE 1, 2, 3) TAPER THREA OF GA YINER VAVE & YINER NEK PEIFIATION (First revision of I 722) (I ) Not to be reproduced without the permission of ast date for receipt of BI or used as a TANAR comments is: 3 April 215 FOREWOR (Adoption clause will be added later on) This draft standard was originally issued in In this revision all the amendments have been incorporated and the following major changes have been made: a mm thread has been deleted since same has become obsolete b. Master heck Plain Plug gauges & check thread plug gauges have been introduced 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 I 2 : 196 Rules for rounding off numerical values (revised). The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1
3 FOR BI UE ONY February 215 raft Indian tandard INPETION GAUGE FOR HEKING TYPE IV (IZE 1, 2, 3) TAPER THREA OF GA YINER VAVE & YINER NEK PEIFIATION (first revision of I 722) 1 OPE This draft standard prescribes dimensions, tolerances and material requirement of inspection gauges recommended for checking the taper threads on valve stems and the taper threads on cylinder necks for compressed gas cylinders threads conforming to Type IV (izes 1, 2 and 3) taper 1:8 on of I REFERENE This draft standards listed below contain provisions which, through reference in this text constitute provisions of this standard. At the time of publication, the editions were valid. All standards are subject to revision and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below: I N o. T i t l e 157 (Part 2) : 1979 chedules for wrought steel Part 2 : arbon steels (unalloyed steels) (First Revision) 1586 : 2 Method for Rockwell hardness test for metallic material (cales A - B E - F - G - H K 15N, 3N, 45N, 15T, 3T and 45T) (Third Revision) 373 : 1967 Assessment of urface roughness 3 MATERIA Inspection Gauges shall be made of wear resisting steel conforming to I:157 or any other equivalent Indian tandard. 4. THREA FORM 4.1 Basic Thread Form (see Fig. 1 & 2) Fig. 1 Form of thread for gauges A and E 2
4 FOR BI UE ONY February 215 Fig. 2 Form of thread for gauges B and F 4.2 Principal imensions (see Table 1a & 1b) Table 1a Principal imensions of Type 4 Taper crew Threads on Valve stems and in ylinder Neck (all dimensions in millimeters) ize Taper on Pitch tem ength ylinder ength of esignation size of iameter measured Major of Neck engagement Valve along the one iameter Thread Major iameter ength of thread in ylinder Neck Max. Min. Min. Min. ize : ize : ize : Table 1b imits for Type 4 Taper crew Threads on Valve stems and in ylinder Neck (All dimensions in millimeters) ize esignation size of Valve ize ize ize Thread Element iameter of thread on valve stem at small end iameter of thread at mouth of cylinder Max. Min. Max. Min. Major ia Pitch ia Minor ia Major ia Pitch ia Minor ia Major ia Pitch ia Minor ia
5 FOR BI UE ONY February IMENION AN TOERANE OF GAUGE FOR HEKING THREA IN YINER NEK 5. 1 Full Form Plug crew Gauge, for checking Threads in ylinder Neck Gauge A (For form of thread see Fig. 1) imension ize* Major iameter at face a Pitch at face a Minor at face a 25.4 Major iameter at face a Pitch at face a Minor at face a Major iameter at face a Pitch at face a Minor at face a Value Plus Minus Taper * Represents the maximum major at the small end of valve stem. Note a) The pitch should not fall below the minimum value stated. After adding to this measured size the diametral equivalent of any errors present in the flank angles, the result should not exceed the maximum value stated for the pitch. b) The tolerance for pitch is.5 mm and that is the maximum erro r permitted in the relative axial positions of any two threads along the length of the gauge. The error may be plus or minus. c) The gauge is so designed that when pressed or screwed home by hand, the neck of the cylinder should lie flush with or protrude beyond face a, but not beyond face b. 4
6 FOR BI UE ONY February Plug crew Gauge for checking Pitch iameter of thread in ylinder Neck Gauge B (For form of thread see Fig. 2) imension ize* Pitch at face a 25.4 Pitch at face a Value Plus Minus Taper Pitch at face a *Represents the maximum major at the small end of valve stem. NOTE a) The pitch gauge is intended to operate about half way along the thread in the cylinder neck. b) The pitch should not fall below the minimum value stated. After adding to this measured size the diametral equivalent of any errors present in the flank angles, the result should not exceed the maximum value stated for the effective. c) The gauge is so designed that when pressed or screwed home by hand, the neck of the cylinder, should lie flush with or protrude beyond face a, but not beyond face b. 5
7 FOR BI UE ONY February Plain Plug Gauge for checking Minor iameter at mall End Gauge ize* imension Value one at face a one at face a Plus Minus Taper one at face a *Represents the maximum major at the small end of valve stem. NOTE The gauge is so designed that when pressed or screwed home by hand, the neck of the cylinder, should lie flush with or protrude beyond face a, but not beyond face b. 5.4 Plain Plug Gauge for checking Minor iameter at arge End in ylinder Neck - Gauge 6
8 FOR BI UE ONY February 215 imension ize* one at face a 25.4 one at face a one at face a All dimension in millimeters) Value *Represents the maximum major at the small end of valve stem. Plus Minus Taper NOTE - The gauge is so designed that when pressed or screwed home by hand, the neck of the cylinder, should lie flush with or protrude beyond face a, but not beyond face b. 6 IMENION AN TOERANE OF GAUGE FOR HEKING THREA ON TAPER TEM 6.1 Full Form Ring crew Gauge for checking thread on Taper tem Gauge E (For form of thread see Fig. 1) 7
9 FOR BI UE ONY February 215 imension ize* Major at face a Pitch at face a Minor at face a Value Plus Minus Taper 25.4 Major at face a Pitch at face a Minor at face a Major at face a Pitch at face a Minor at face a * Represents the maximum major at the small end of valve stem. NOTE - The gauge is so designed that when pressed or screwed home by hand, the stern of the cylinder valve, should lie flush with or protrude beyond face a, but not beyond face b. 6.2 crew Ring Gauge for hecking Pitch iameter of Taper tem, Gauge F (For form of thread see Fig. 2 ) 8
10 FOR BI UE ONY February 215 imension ize* Pitch at face a 25.4 Pitch at face a Pitch at face a Value *Represents the maximum major at the small end of valve stem. NOTE - Plus Minus Taper a) The pitch gauge is intended to operate about half way along the thread on the stem. b) The gauge is so designed that when pressed or screwed home by hand, the stem of the cylinder valve, should lie flush with or protrude beyond face a, but not beyond face b. 6.3 Plain Ring Gauge for hecking Major iameter at mall end of Taper tem Gauge G 9
11 FOR BI UE ONY February 215 imension ize* one at face a 25.4 one at face a one at face a Value *Represents the maximum major at the small end of valve stem. Plus Minus Taper NOTE - The gauge is so designed that when pressed or screwed home by hand, the stem of the cylinder valve, should lie flush with or protrude beyond face a, but not beyond face b. 6.4 Plain Ring Gauge for checking Major iameter at arge End of Taper tem Gauge H 1
12 FOR BI UE ONY February 215 imension ize* one at face a 25.4 one at face a Value Plus Minus Taper one at face a *Represents the maximum major at the small end of valve stem. NOTE The gauge is so designed that when pressed or screwed home by hand, the stem of the cylinder valve, should lie flush with or protrude beyond face a, but not beyond face b Methodology For using of the master check plug for checking plain ring gauges for major at small end (Gauge G) & major at large end (Gauge H ) a) heck plug to be fully inserted on the working plain ring gauge. are shall be taken not to use undue force. b) Top face `x' of the check plug should either flush with the face `b' of the ring gauge or may protrude X1 mm beyond the face `b' of the ring gauge. 11
13 FOR BI UE ONY February IMENION AN TOERANE FOR MATER HEK PUG GAUGE 7.1 imension & of Master Plain check Plug gauge for checking taper Plain Ring gauges G & H Master check plug for checking plain ring gauge for major at small end ( Gauge G ) & major at large end ( Gauge H ) ize imension Value Taper 1+ Plus Minu s one (d) at face x X one (d) at face x one (d) at face x Methodology For using of the master check plug for checking plain ring gauges for major at small end (Gauge G) & major at large end (Gauge H ): a) Master check plug to be fully inserted on the working plain ring gauge. are shall be taken not to use undue force. b) Top face `x' of the Master check plug should either flush with the face `b' of the ring gauge or may protrude X1 mm beyond the face `b' of the ring gauge. 12
14 FOR BI UE ONY February imension & of Master Thread heck Plug Gauge for hecking Taper Thread Ring Gauges E & F Master check plug for full form (Gauge E) & effective form (Gauge F) Taper Thread Ring Gauges (For form of thread see Fig.1) imension Value Taper 1 + ize Plus Minu s Major (d1) at face w in Pitch (dp) at face w on +.1 Minor (d2) at face w leared W Major (d1) at face w Pitch (dp) at face w Minor (d2) at face w leared 1 in 8 on Major (d1) at face w Pitch (dp) at face w Minor (d2) at face w leared 1 in 8 on
15 FOR BI UE ONY February Methodology For using of the Master check plug for checking full form (Gauge E) & effective form (Gauge F) taper thread ring gauges: a) Master check plug to be fully screwed on the working thread ring gauge. are shall be taken not to use undue force. b) Top face `w' of the Master check plug should either flush with the face of the ring gauge or may protrude W1 mm beyond the face `a' of the ring gauge. 7.3 hecking of Taper Plain Plug gauges and Taper thread Plug gauges shall be carried out directly by measurement using optical or other suitable equipment. 8 GENERA REQUIREMENT OF GAUGING URFAE 8.1 Hardness Rockwell 6 to 62 when determined according to I urface Roughness of Gauging Portion shall be.2 microns (max.) (Ra value) when determined according to I Finish The gauging surface shall be ground and suitably stabilized, the method of stabilizing shall be as per agreement between the manufacturer and the customer. urfaces other than gauging surface to be finished smooth. 9 EIGNATION The gauges shall be designated by the following: a) size of the valve/cylinder; b) Gauge type and c) Number of this standard. Example : A screw ring gauge for testing pitch of taper stem for mm valve size will be designated as mm Gauge F, I orrosion protection and packing Gauges shall be protected against climatic condition by application of any anti-corrosive coating. Packing shall be suitable to prevent damage in transit. 11 MARKING 11.1 The Gauge shall be marked with the following: a) size of Valve b) Gauge type and number of this standard c) Manufacturer name or trade mark d) erial no. with the year of the manufacture 11.2 BI ertification Marking Each gauge may also be marked with the tandard Mark The use of BI certification mark is governed by the provisions of Bureau of Indian tandards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which the license for the use of tandard Mark may be granted to manufacturers or producers may be obtained from the Bureau of Indian tandards. 14
16 ANNEX FORMAT FOR ENING OMMENT ON BI OUMENT (Please use A4 size sheet of paper only and type within fields indicated. omments on each clauses/sub-clauses/table/fig. etc be started on a fresh box. Information in olumn 4 should include reasons for the comments and suggestions for modified wording of the clauses when the existing text is found not acceptable. Adherence to this format facilitates ecretariat s work) oc. No.: TITE: AT ATE OF OMMENT: NAME OF THE OMMENTATOR/ORGANIZATION: l. No. lause/ubclause/ para/table/fig. No. commented ommentator/ Organization/ Abbreviation Type of omments (General/Editorial/ Technical) Justification Proposed change
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