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“The Right to Information, The Right to Live”
“Step Out From the Old to the New”
Mazdoor Kisan Shakti Sangathan
Jawaharlal Nehru
IS 9687 (1980): Specification for Inspection Gauges for
Checking Type 1 (Size 1) Taper Threads of Gas Cylinder
Valves, Taper 1 in !6 [MED 16: Gas Cylinders]
“!ान $ एक न' भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”
है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
UDC
: 531.718’451 : 621.646.22 : 621.642-02
621’7533
( First Reprint
AUGUST
IS: 9687 - 1980 j
Reaffirmed 2006
1996 j)
( (Reaffirmed
1998 )
Indian Standard
SPECIFICAT-ION
FOR INSPECTION GAUGES ~FOR
CHECKING TYPE 1 (SIZE 1) TAPER THREADS OF
GAS C.YLINDER VALVES, TAPER 1 IN 16
tolerances
and material
requirement
of inspection
gauges
dimensions,
. Scope - Prescribes
ecommended
for checking
the taper threads
on the valve stems and the threads
in the cylinder
recks of valve fitting conforming
to Type 1 ( Size 1 ) of IS : 3224-1979 ‘ Specification
for valve fittings
or compressed
gas cylinders
excluding
liquefied
petroleum
gas (LPG) cylinders
( second
revision
) ‘,
Note-This
type of thread
valve outlet and inlet connection.
!.
!.l
Dimensions
Basic
of Threads
Thread
14 NGT of ANSI
also conforms
to size l/2”American National Standards
Institute.
on Val-ve
Stems
and
in Cylinder
-
6 57.1 Compressed
Necks
Form
L---“--I
INTERNAL
EXTERNAC THREAD
Pitch measured parallel to axis, p = l-814 mm
Thread angle 60’ normal to the axis
Taper’1 in 16 measured on ths diameter along the axis
H = 0.866 025 P = height of 60” sharp V thread = 1571 22 mm
h = 0.800000 P = height of thread on product = 1,451 43 mm
at root
fc* = depth of truncation
at crest, fr * = depth of truncation
Fc = width of flat at crest, Fr* = width of flat at root
Note-The
thread is same as l/2” - 14 National Gas Taper (NGT) threads
*For limits
Adopted
THREAD
of ANSI-
B 57 1 -1965,
see 2.3.
13 November
@ July
1980
1981, BIS
~Gr 6
I
BUREAU
MANAK
OF
BHAVAN,
INDIAN
STANDARDS
Q BAHADUR
NEW
DELHI
SHAH
110002
ZAFAR
MARG
gas cylinder
-IS : 9687 - 1980
2.2 Principal
Dimensions
All
dimensions
in millimetres.
STYLE B
TYPICAL
LOW
PRESSURE
CYLINDER
DRAWN
0 = major
CYLINDER
diameter
De = 20.716
D,e = 21.9
E = pitch
diameter
Ee = 19.263
E, =
19.771
E3 = 18.923
EM = 20’452
K = minor
diameter
K:, = 17.473
I, = standard
handtight
L3 = 3 threads
engagement
( for wrenching
= 6.126
)
L‘ + L, = 13.571
Ls = length
of full external
LD = length
of full roots
Lrn = overall
lelgth
threads
( minimum)
of external
= 19.014
on internal
threads
threads
MInimum
diameter
at small end of the valve
Maximum
diameter
at countersink
= 17.196
) = 19
(approx
after
= 22.5
2
chamfer
= 17.5
IS : 9687 - 1980
2.3 Limits on Crest and Root Truncation
All
dimensions
in millimetres.
INTERNAL
MlNlMUM
THREAD
MAXIMUM
TRUNCATION
EXTERNAL
P = pitch
= l-814
H = height
of sharp
V thread
h = height
of thread
on product
= 0.866
025 P =
on crest
fMu;n
0,033
P = 0.059 87
fMax
0.078
P = 0.141 51
Tolerance
0.038
=
FM~~ = 0.090
width
of flat
P = 0.068 94
P =
0.163
29
= 0.094 35
Tolerance
2.4 Limits on Size are & 1 turn
2.5 Limits
0 Min
root
= 0.081 64
F = equivalent
threads
and
1.571 22
= 1,451 4 Max
l-288
f = truncation
FM,”
THREAD
Final
from
inspection
limits
on size ( pitch diameter
) of both external
and internal
basic, although
the preferred
working
limits are 3~ 1’2 turn from basic.
on Taper
a) The taper
tolerance
b) The
plus
on pitch elements
of external
of 1 turn, but no plus tolerance
taper on the pitch
tolerance
of 1 turn
2.6 The tolerance
on 60” angle
threads
shall
in gauging.
of threads
shall
2.8 The maximum
per millimetre
line
with
a minus
diameter,
with
be -C 2”.
of effective
threads
shall
greater than 25’4 mm.
on pitch
diameter,
elements
of internal
threads
shall
be 1 in ‘i6 on
but with no minus tolera:lce
in geuging.
2.7 Th-e tolerance
on lead in leng!h
threaded
to an effective
thread length
taper
be 1 in 16 on
shall
be _1 0 07G 2 mm
be 0.072 9 and the
valid
minimum
for any size
O’C57 3.
a
IS:9687-1980
3. Dimensions
of Gauges for Checking
and Tolerances
3.1 Full Form Plug Screw
Gauge
for Checking
All
Thread
dimensions
Threads
in Cylinder
Neck,
DIA
AT
PITCH
0
0.05
SMALL
Gauge A
END:
!9.983-
OIA
DIA
Oo.o,r
16.697
1
uM4+y5
-I-
DIA
is,
Neck
in millimetres.
MAJOR
@ 20.236
in Cylinder
AT LARGE’END:
MAJOR
PITCH
1$14
OIA 20.549
DIA
~1,.196-:.0ls
1
19.263?o.oos
ENLARGED
Taper
-.jl---jL,
l O.Oz5
0
THREAD
FORM
1 in 16 on diameter
Tolerance
Tolerance
on taper
on lead
in length
in length
4
9.070 = ’
9.070 =
i’015
f 0.005
IS : 9687 - 1980
3.2 Taper
Screw
Plug
Gauge
for Checking
All
Pitch
Diameter
dimensions
in Cylinder
AT
LARGE
20.797
DIA
19.771
Taper
-_cI
THREAD
FORM
1 In 16 on diameter
Tolerance
Tolerance
In length
on lead
f1 =
in length
+ to15
L1 =
f
:o.oac
,1°L7’
I
/I\
ENLARGED
END:
R DIA
-1.811
,I\
L,, Gauge
in millimetres.
DIA
0.272
Neck
0.005.
24”
B
lS:9687-1980
3.3 Plain
3.3.1
Taper
Plug
Maximum
Gauge
for Checking
truncafion
Crest
Truncations
plain -taper plug gauge,
All dimensions
of Infernal
gauge
Thread,
Gauge C
Cq
in millimetres.
GRIND
AND
LAP,
TAPER
1 IN16
ON OIA
100 ON DIA-:.or‘
Mxt
i’
Note - The gauge
truncation
at plane 1.
3.3.2
Minimum
diameter
truncation
at the basic
plain
taper
step
plug
All
is that minor
gauge,
dimensions
gauge
diameter
6.926-o.&
Bt 10.739-00.050
Mnt 12,553
which
corresponds
-00.~40
to the maximum
crest
Cp
in millimetres.
Mx 6.31L+o.o3~
Mn 9.941
gauge
Note -The
truncation
at-plane 1.
diameter
at the basic
step
Is that
minor diameter
6
which
corresponds
r0.0~
to the minimum
crest
I5 : 9687 -1980
4. Dimensions
and Tolerances
4.1 Full Form Screw
Ring
of Gauges for Checking
Gauge,for
Checking
Thread
All dimensions
OIA
PLANE
AT
DIA
19.263
MINOR
OIA
17.977
--+-y
L.500
of Taper
Sfem
on Taper
La, Gauge
Stems
D
in millimetres.
XX:
PITCH
Threads
X
La s19.014*8;015
--I
i
1
I
ENCI.
DIA AT LA ,RGE
PITCH
DIA 20.L52
MINOR
DIA 19. 166*oo’“”
“Jr
I--
2.225
I
L-----I
0.142
l.RlL
.._.
ENLARGED
-I
I
PITCH
DIA
30t15’
THRI
:A()
FnRM
. _...
I
Taper
Right
1 in 16 on diameter
hand thread
Tolerance
Note-The
when assembled
on pitch
normal
tolerance
in length
IO*886 _ i.023
to the axis.
in length
10.886 = 0’008.
large end ot the ring is to be flush with the appropriate
hand tight.
gauging
step
of master
plug within
f
0’051
IS : 9687 - 1980
4.2 Ring Screw Gauge for Checking
of Taper Stem L1, Gauge
Pitch Diameter
All
dimensions
E
in millimetres.
X
DIA Al PLANE
XX:
PITCH OlAt 19.263
MINOR DIA= 16.237
END:
CIIA AT LARGE
‘ITCH DIA: 19.771
IlriOR
DIA= 18.765*~“‘5
ENLARGED
THREAD
Taper 1 in 16 on diame!er
Right
hand thread
Tolerance
onpitch
normal
tolerance
FORM
in length
L1 =
I
- 00.023
to the axis.
in length
L1 = 0*008.
Note - The large end of the ring is to be flush with the appropriate
when assembled hand tight.
8
gauging
step
of master
plug
within
f O+oSl
15:9987-1980
4.3 Plain Taper Ring Gauge for Checking Crest Truncations
All
dimensions
of
External
Threads,
Gauge F
in mlllimetres.
D AN0
RANCE
LAP,
TAPER
1 IN 16 ON OIA
P_ER 100 ON DIA-:.otr
@ 50.800
VNURLE 0
-DIA AT LARGE
21.22c-oo.00S
~ENLARGED
VIEW
OF
DEVELOPMENT,
END
ANTICLOCKWSE
Note 1 - The inner diameter
of the gauge at basic step ‘6’ (distance
8.128 mm from
diameter which corresponds
to minimum crest truncation
at plane 1 on the external
thread.
Note 2- The inner diameter of the gauge at step ‘8t’ (distance
lo*739 mm from
which corresponds
to maximum crest truncation
at plane 1 on the external
thread.
9
datum)
datum)
is that major
is that major
diameter
IS: 9687 - 1980
5. Dimensions
5.1 Masfer
Gauge M
and Tolerances
Thread Plug
on Master
Plug
Gauges
Gauge to Check LI ( Gauge E) and LB ( Gauge D ) Screw
All
dimensions
Gauges,
in millimetres.
DIA AT PLANE
BE:
MAJOR DIA 21.L76
PITCH
Ring
r
DIA
OIA 20.452
A;
PLANE
AA
:
MAJOR DIA 20.797-&z
PITCH DIA 19.771ro.oos
--I
B
1 I L:
DIA AT SMALL
END:
MAJOR
OIA 20.289
I TCH DIA 19.263
L, =8.126~0.025
E-f
A
Ls=19.01&
_oo.O~S
B
22.225
ENLARGED
THREAD
FORM
Taper 1 in 16 on diameter
Tolerance
Right
hand thread
Tolerance
6. Usage of Gauges -
in length
A description
L1 =
+i’015
normal to the axis
on pitch
in length
f, = f
0.005
of the usage of the gauges is given in Appendix
A.
7. Material - Suitable wear resisting steel, for example, 8503 of IS : 1570 ( Part II )-1979 ’ Schedules
for wrought steels for general engineering
purposes: Part II Carbon steel ’ or suitable case hardening
steel, for example, 15C4 of IS : 1570 ( Part II )-1979.
8. General
Requirements
of Gauging
Surfaces
8.1 Hardness - 750 HV minimum determined according
ness test for steel ( first revision ) ’ or its equivalent.
10
to IS : 1501-1968 ’ Method
for Vickers
h.ar&
IS : 9687 - -1980
8.2 Surface Roughness of
IS : 3073-1967 ‘Specification
8.3 Finish -Ground,
of the manufacturer.
9, Designation
microns ( R,
Gauging Portion -0’2
for assessment of surface roughness
value ) determined
‘.
according
Method of stabilizing
left to the
lapped and suitably stabilized.
Surfaces other than gauging surface to be finished smooth.
-The
gauges shall be designated
to
discretion
by the following:
Gauge type and number of this standard
Example:
A screw range gauge for checking
pitch diameter
of taper stem shall
be designated
by
Gauge E, IS :9687
10. Marking
-
The gauge shall be marked with the following:
a) Gauge type and number
b) Manufacturer’s
c) Serial
name or trade-mark,
and
number.
10.1 ISI Certification
11. Corrosion
by applications
transit.
of this standard,
Marking
-
Details
available
with the Indian
Standards
Institution.
Protection
and Packing - Gauges shall be protected against climatic
of any anti-corrosive
coating.
Packing should be suitable to prevent
APPENDIX
A
( Clause
USAGE
conditions
damage in
6 )
OF GAUGES
A-O. Special gauges are required for the gauging of these threads
rigid requirement
for sealing the compressed gas against leakage.
because
of their length
and the
A-l. Pitch Diameter of External Thread - To check the pitch diameter of the external thread,
the thread ring gauges E and 0 are used.
The LI ring gauge ( Gauge E ) is known as a primary
;;“,gee because the reading taken on this gauge will be needed for use when additional
gauging IS
should
The LS ring gauge ( Gauge 0) is screwed on to the valve flat face first.
lie within the topmost and bottom-mcst notch on the gauge.
The end of the valve
Take out the LS ring gauge and screw in L1 ring gauge.
If the end of the valve lies within
topmost and the bottom-most gauging notch, the pitch diameter is acceptable.
the
Note where fhe valve and flushes on the L, ring gauge.
It may flush either with the topmost
notch or the middle notch or the bottommost notch. It may also lie in between the notches in which
case measure the distance from middle ( basic) notch to the valve end face (say x mm) which may
be either (a) above, or (b) below the basic notch.
A-2. Crest Truncation
of External Thread -To
check the crest truncation
the gauge F is used.
The gauge should be placed over the thread.
11
of the external
thread
c
IS : 9687 - 1980
If the end of the valve in the L1 screw ring gauge above flushed with the bottommost step on
the LI ring gauge, the end should now lie within the step M, and A&.
If~the end flushed with the
topmost step, it should now lie within the step h/l,, and Mnt.
If iH flushed with Ihe middle siep,
it
should lie within the steps 8 and Bt. If the valve end did not flush with any of the three steps of
the LI screw ring gauge and where the distance from the basic step was measured as described
in A-l, the valve end should either (a) stand proud of the step 8 by minimum x mm [ case (a) in A.1 ]
and can extend up to a maximum of x mm above the step 8t, or (b) go down from step 8 by maximum
x mm [case (b) in A-l ] and can extend up to a maximum x mm below the step Bt.
A-3. Pitch Diameter of Internal Thread -To
check the pitch diameter of internal thread, the
thread plug gauges 8 and A are used.
The LI screw plug gauge ( Gauge 8 ) is known as a primary
gauge because the reading taken on this gauge will be needed when additional
gauging is done.
The Lg plug gauge (Gauge A ) is screwed into the cylinder.
lie within the topmost and bottommost notch of the gauge.
within
The face
of the cylinder
should
Take out the Lg rjlug gauge and screw in the LI plug gauge.
If the face of the cylinder
the topmost and the bottommost gauging notch, the pitch diameter is acceptable.
lies
It may flush either on the
Note where the face of the cylinder flushes on the L1 plug gauge.
It may also lie in between the notches
topmost notch or the middle notch or the bottommost notch.
in which case measure the distance from the middle ( basic) notch to the face of the cylinder
It may be either (a) below, or (b) above the basic notch.
(say x mm).
A-4. Crest Truncation
of Internal
gauges Cl and CS are used.
Thread -
To check the crest truncation
of internal
thread, the
If the face of the cylinder flushed with the bottommost notch on the f1 ~plug gauge as described
in A-3, it should lie within the two bottommost steps of the gauges CI and Cp. If the face of the
cylinder
flushed with the topmost step, it should lie within the two topmost steps of the gauges
face flushed with the middle step, it should lie within the two middle
Cl and Cp. If the cylinder
steps of the gauges C, and Cp. If the face did not flush with any of the three steps of the L1 plug
gauge and where the distance from the basic step to cylinder face was measured as described
in A-3, the face of the cylinder should either (a) go below the basic step by an amount of maximum
x mm for gauge Cp and minimum x mm for Cl gauge [case (a) in A-31, (b) stand proud of the
basic step by an amount minimum x mm for gauge Cp and maximum x mm for gauge Cl [case (b)
in A-31.
12
Printed
--
.-
_
at New
India
Printing
Press.
Khurla,
India