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IS 13095 (1991): Butterfly valves for general purposes [MED 17: Chemical Engineering Plants and Related Equipment]
13095 : 1991
(First Reprint JUNE 19% )
621.646.25
: 669*13/*14
@I BIS
valves’
( BSI
( reuised )‘.
VALVES FOR PURPOSES
1.1 This standard covers double
wafer type of metal seated, resilient seated cast
iron, ductile iron and carbon steel and lined
pneumatically, hydraulically or electrically ope-
1.2 It covprs valves of nominal pressure designa- tions up to and including 4 MPa and Class 300 with ends flanged in accordance with appropriate tables of IS 6418 : 1971 ‘Cast iron and malleable
cast iron flanges for general engineering purposes ’
accommodated between pipe work flanges in
accordance with appropriate tables of IS 6418 :
nominal sizes DN 40 to DN 2000. It also covers valves up to class 300 and flanges as per the pressure/temperature ratings given in IS 13159 ( Part 1 ) : 1991 ‘Steel pipe flanges and flanged fittings : Part 1 Dimensions’ and IS 6418 : 1971 ‘Cast iron and malleable cast iron flanges for general engineering purposes’.
flanges’
6392 : 1971
in IS 4854
( Part 3 ) : !974 are generally applicable.
4.1 Double Flanged Valves
A valve having flanged ends for connection
pipe flanges by individual Fig. 1.
bolting as shown in
4.2 Wafer
using through bolting,
lug type, U-section
or flangeless type as shown in
FJG. 2
BUTTBRFLYVALVB, SINGLE FLANGE WAFER TYPE
WAFBR LUGGED SCREW
WAPER LUGGED THROUGH BOLT
BUTTBRFLYVALVB, FLANGBLBSS
BUTTBRFLYVALVE, DOUBLE FLANGED TYPE
BUTTBRFLYVALVB, U.SECTION WhPBR TYPE
This type of valve
this may not be assumed.
figures are illustrative
-1s 13095 Yl!m
5.1 Valves shall be suitable for one or more of the
Tight’shut
A valve having no visi- ble leakage past the disc in closed position under teat conditions.
b) Regulating
A valve intended for regulating purposes and which may have a clea- rance between the disc
c) Low leakage
A valve which has speci- fied maximum leakage rate past the disc in the closed position.
Where valves are to be used under vacuum conditions, purchaser shall mention specilically and the detailed design provision shall be mutu- ally agreed between the purchaser and the manu- facturer.
The range of nominal valve size ( DN ) in mm shall be as follows:
65, 80, 100, 125, 150, 200, 250, 300, 350,
450, 500, 600, 700, 800, 900,
1400, 1600, 1800 and 2 000.
working pressure ( MPa ) at 20°C temperature as
sure ( PN ) defined as the maximum
PN 0.25, PN 0.6, PN
1.0, PN 2.5 and PN 4.0
7.2 The class designations
and class 300.
for valves specified by
sixes shall be class 125, class 150
8 PRESSURE/TEMPERATURE
Maximum permissible gauge working pressure and operating temperatures shall be in accordance with IS 6418 : 1971 and IS 13159 ( Part 1 ) :
1991 except that restrictions on temperature may be placed by the manufacturer on valves in accordance with this standard by reason of valve type, trim materials or other factors. However, all valves shall be suitable for continuous use at their PN designation within the temperature range of
1O’C to 65°C.
9.1 Double
The dimensions of flanged body ends and drillings
. shall be in accordance with the requirement given
in Annex B. Flanges as per any other specific requirements of the purchaser may also be given as agreed to bttween the manufacturer and the purchaser or as per IS 13159 ( Part 1) : 1991.
9.1.1 Flanges shall be at right angles to the axis of the bore and concentric with the bore. Flanges shall be drilled unless otherwise specified and bolt holes shall be off centres. Tapped holes in the flanges may be used when required by the design of the valve.
9.2.1 Body ends shall be capable of being fitted
between the pipe flanges complying with the requirements of Annex B flange drilling.
faces shall be at right angles to
the axis of the bore and concentric with the bore.
the design, for the passage of the bolts securing the flanges and the valve. Where through bolting is not particable due to the presence of valve shaft, bearing housing, tapped holes may be provided for individual bolting of each flange.
9.2.3 Holes may be provided,
9.2.2 The joint
types of valve shall be as per Table
gaskets at both ends.
The manufacturer shall ensure that adequate
space will be available between valve flanges for
bolting when flanged valve with short body face to face or wafer long face to face are manu- factured.
1 shall be as follows:
Face to Face Dimensions oj
Body end ports shall be circular and the numeri- cal values of the diameter shall be as close as possible to the value of DN.
Table 1 Face to Face Dimensions
( Clauses10.1 to 10.3)
ged Long
PN 2’5
125/:50
PN 4’0
( circlips
ing enclosure.
2 or superior.
N’i 12 MO
metal-suitable
( seeNote
XI. Rubber
II IS rt~cc~rnrnrr~d~~~l
roatrd
is madr
11 I:,
ret ~~rnmelldvd
rt.slllvut
\c.~I (jr
a11 over.
16.1 Manual Operation
16.5.3 Rod
caps shall
be of nitrile
All valves shall be capable of being operated at a differential pressure across the disc as marked on the valve. Lever, worm gearltravelling nut type or any other suitable type of operator can be used.
Unless otherwise specified, manually operated valves shall be closed by turning handwheel or iever in a clockwise direction when facing the handwheel or lever. The design of lever when
fitted shall be such that the lever may only be
direction of flow when the valve is open.
16.6 Pneumatic
16.6.1 With cylinder operation, pressure shall be
maintained on the cyclinder piston at each end of its stroke unless other means are provided to prevent drifting.
wiper to clean the piston rod before it enters the cylinder. Alternatively cylinder with its linkage should be housed in weather-proof enclosure.
material suitable for air service,
16;6.3
seals, rod
and piston caps shall
16.1.2 Al] gear travelling nut operators shall be
provided with suitable stops to prevent movement of the shaft beyond the limit correspnding to the fully closed position of the disc.
16.1.3 All gear/travelling nut operators shall be
packed with grease for life time operation. Gear/ travelling nut operators shall be totally enclosed and whether proof for general application. For special applications such as marine, submerged service, buried service etc. the purchaser may specify special enclosure.
16.1.4 All gearltravelling nut operators shall be
self locking type. AI1 lever operated valve shall be capable of being locked at at least three inter- mediate positions.
or ‘SHUT’
ahall be provided
with arrange-
the disc position.
16.4.1 Electric motor drives shall be equipped with limit switches and torque switches for both open and closed positions.
shall be totally
in a lubricant.
With cylinder operation, pressure shall be
maintained on cylinder piston
each end of its
stroke unless other means
All valves shall be hydrostatically tested by the manufacturer before despatch. The pressure shall be obtained without any significant hydraulic
shock. Testing shall be carried on before applica- tion of paint or other similar treatment unless otherwise agreed between the purchaser and the
within the part of the valves subjected to test pressure.
There shall be no air entrapped
Each valve shall be shop operated from fully closed to fully open position and reverse, under no pressure and no flow condition to demonstrate that the complete assembly is workable.
17.2 Body Test
be in slightly
The seating surface of the valve shall he cleaned unless a surface treatment forms an integral part of the design or the use of a temporary surface treatment has been agreed between the manufac- turer and the purchaser to avoid the possibility of damage under the conditions of the test.
19995 i 1991
( Claue~ 17.2, 17.3 and 17.4
this standard and stating the actual pressures and’ medium used in the test.
Up toand including 56
65to 150
350to 1006
1200 to 2 000
( Clause 17.5 )
( scu 5
Not specified. Outside the scope of this standard
NOTE - During the body teat, there rhall be no leak _ age through the metal end joints or the valve shaft real, nor shall any part be permanently deformed.
Applicableto sizes DN 40 to DN 1200 only.
17.3.1 Each valve shall be shop tested for leaks
in closed position. The test shall be conducted with the body flanges in a horizontal position. Pressure shall be applied to the upstream end of the valve, the downstream being open to atmos- phere. The duration of test shall be as per Table 3. There shall be no indication of leakage past the valve disc during test and valves shall be drop tight. Seat test shall be carried out in both the directions of valve if agreed between the manu- facturer and the purchaser. The seat test pressure applied on upstream side shall be equivalent to l-1 times the maximum permissible working pressure at 20°C and shall be applied with water.
17.3.2 For regulating
valves seat test shall
If inspection is required, this shall be stated in
the enquiry/order.
sed representative shall have access to the manu- facturer’s works at all reasonable times to inspect
assembled valve to his order.
20 WITNESSING
this shall be specifically
Whan the purchaser desires
purchaser or his authori-
21 MARKXNG
Marking shall be cast integral on the body or. on a plate securely attached to the body. The mark- ings shall be in accordance with IS 9866 : 1981.
17.4 Disc Strength Test
The test shall be conducted with the body flanges in horizontal position. The test pressure shall be 1.5 times the maximum permissible pressure at 20°C. With disc in closed position, hydrotest pres-
sure shall be applied to the lower face of the disc for duration as per Table 3. There shall be no damage to the valve disc nor any part of valve or
disc shall be permanently deformed
The purpose of this test is to provide evidence of the adequacy and structural integrity of disc and body. Any leakage past the seat shall not be the criteria for rejection of the valve ( Sampling test
per IS 2500 ). For regulating type
valves, disc strength shall not be applicable.
Valve shall be complete in all respect when shipped. Each valve shall be drained, cleaned, prepared and suitably protected with 2 coats of red oxide on unmachined surfaces and rust preventive coats on machined and flanged surfaces for despatch in such a way as to minimise the possibility of damage and deterioration during transit and storage. Painting other than specified on the finished valve shall be as per the agreement between the manufacturer and the purchaser.
Disc shall be unseated when despatched, but care shall be taken to ensure that there is no risk of damage to the disc.
When specified, the body ends shall be suitably sealed to exclude foreign matter during transit and storage.
Components shipped unattached shall be adequately protected and iden tifed to permit correct field assembly.
17.5 Maximum given in Table 4.
When specitied by the purchaser, the manufac- turer shall issue a test certificate confirming that the valves have been tested in accordance with
IS 13o!l5
-23 lNFORMATION
iii) Low leakage rate
iv) Suitability for flow
9 Size of the valve
with ‘fever
Power/voltage/frequency/No.
of phases/
air supply pressure/type
--. MPa
of rotation of handwheel
Maximum differen-
tial pressure ( when
valve shut )
iv) Orientation of handwheelllever with
reference to pipeline
i) Flanged
[ lug
corresponding pre-
flangejflangeless
wafer/U-section
wafer J
( short or long
iii) Flange
Maximum allow-
able pressure drop
( meters
( for power ope-
rated valves )
v) Valve installation - whether horizontal
or vertical shaft
Special requirements like spool pieces,
floor stands, etc.
( Clause2 )
Alumiaium bronze ingots and castings ( second revision )
Leaded tin bronze ingots and castings ( second revision )
1570 Schedules
yed steels )
( Unallo-
1865 : 1974
Iron castings with spheroidal or
nodular graphite revision )
IS Ail.
Carbon steel billets, blooms,
for gene-
ral engineering purposes ( second revision )
butes and by
(&St
Sampling inspection tables:
Part 2 Inspection by variables for percent defective
I&15095:1991
IS x0.
IS Jb.
Garbon steel castings for pres-
aure comaing parts suitable for high temperature service ( fusion welding quality ) ( third
Corrosion resistant high alloy
steel and nickel based castings for general applications ( second
rekrion )
Glossary of terms for valves and their parts: Part 3 Butteryfly valves
system for valves
fittings: Part 1 Dimensions
Zntegtuf‘Crey Cnst
MnlLnble Cast Iron Integral Flanges
IS 6418
: 6418-1971
for DN 80 in which
case the number
holes shall be four )
( Clauses9.1 and 9.2.1
attending to connected
of&l1
permis&ion
(Publication),
needed; if the review indicates that changes are needed, it is taken up for revision. Users
should ascertain that they are in possession of the latest of ‘BIS Handbook’ and ‘Standards Monthly Additions’.
This Indian Standard has been developed from Dot: No.
amendments or edition by referring to the latest issue
17 ( 3744
Manak Bhavafi, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones: 323 0131,323 83 75,323 94 02