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Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a
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access to information under the control of public authorities, in
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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.
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है”ह”ह
IS 12268-4 (1989): Shipbuilding - Automatic Steam Traps
forMarine Use, Part 4: Performance Test [TED 19: MarineEngineering
and Safety Aids]
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--\ 1 8 , ‘._’
. . . .
‘c. IS 12268 ( Part 4 ) : 1989
Indian Standard
SHIPBUILDING - AUTOMATIC STEAM TRAPS FOR MARINE USE PART 4
PERFORMANCE TEST
UDC 621’186’6 : 629’12 : 620’16
I.)..
j
‘I - \
: 6-0 0 BIS 1990
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR
MARG
NEW DELHI 110002
May 1990 Price Group 2
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Marine Engineering Sectional Committee, TED 019
FOREWORD
This Indian Standard (Part 4) was adopted by the Bureau of
Indian Standards on 19 December 1989, after the draft finalized by
the Marine Engineering Sectional Committee had been approved by the
Transport Engineering Division Council.
The standard on automatic steam traps is being published in the
following five parts:
Part 1 Glossary of terms,
Part 2 Classification,
Part 3 Face-to-face dimensions,
Part 4 Performance tests, and
Part 5 Marking
This part is based on IS0 6948 : 1989 ‘Automatic steam traps -
Production and performance characteristic tests’, issued by the
International Organization for Standardization ( IS0 ).
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IS 12268 ( Part 4 ) : 1989
Indian Standard
SHIPBUILDING - AUTOMATIC STEAM TRAPS FOR MARINE -USE PART 4
PERFORMANCE TEST
1 SCOPE
1.1 This standard (Part 4) specifies tests appli- cable to
automatic steam traps. These tests categorised as production tests
and performance characteristic tests, shall be carried out to
ensure the correct functioning of a steam trap or to evaluate the
performance of a particular design.
S.2 The test methods corresponding to each one of the two
categories of tests are also briefly described.
2 REFERENCES
2.1 The following Indian Standards are necessary adjuncts to
this standard:
IS No.
12268 (Part 1) : 1987
12268 ( Part 2 ) : 1987
12268 ( Part 5 ) : 1987
Title
Automatic steam traps for marine use: Part 1 Glossary of terms
Automatic steam traps for marine use: Part 2 Classifica- tion
Automatic steam traps for marine use: Part 5 Marking
3 TERMINOLOGY
3.1 For the purpose of this standard, the foilow- ing
definitions, in addition to those given in IS 12268~( Part 1) :
1987 shall apply.
3.2 Production Tests
Those tests carried out by the manufacturer to confirm that each
automatic steam trap functions correctly. These tests may be
witnessed by the purchaser or his representative. These tests are
referred to as -acceptance tests.
3.3 Performance Characteristic Tests
Those tests carried out to determine the opera- tional
characteristics of a particular design of steam trap.
4 PRODUCTION TESTS
4.1 General
If the purchaser wishes to witness the tests, this shall be
specified in the order. The manufacturer shall give the purchaser
at least five days notice of the date when the tests will be
performed.
4.2 Product Inspection
Samples of the finished traps shall be visually examined and
dimensionally checked to ensure that the traps correspond to the
stated specifica- tion and aremarked in accordance with IS 12268
(Part 5 ) : 1987.
4.2.1 Identification of material for body and internals shall be
in conformity with those specified by Indian Boiler
Regulations.
4.3 Shell Testing
Each steam shall be tested to confirm the integrity of its shell
under pressure. Further details are given in 6.1.
4.4 Operational Check
Sample steam traps shall be tested to ensure that they open to
discharge condensate and close satisfactorily. Further details dare
given in 6.2. This test does not apply to the labyrinth (or orifice
> steam traps [ see 1S 12268 ( Part 2 ) : 1987 I.
5 PERFORMANCE CHARACTERISTIC TESTS
5.1 General
A manufacturer may describe the operations of a particular type
of steam trap by referring to one or more of the following
performance characte- ristic tests. A brief explanation of the
derivation of each characteristic is given below further details on
the appropriate test methods are specified in 6.
5.2 Minimum Operating Pressure
The steam trap shall be tested to determine the minimum pressure
(atmospheric or above ) at which correct opening and closing
occurs.
5.3 Maximum Operating Pressure ( PM0 )
The steam trap shall be tested to determine the maximum pressure
at which correct opening and closing occurs.
5.4 Maximum Operating Back Pressure ( PMOB )
The steam trap shall be tested to determine~the maximum pressure
permissible at the outlet of the device which allows correct
functioning.
5.5 Air Venting Capability
The steam trap shall be ability to discharge air.
tested to determine its
1
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IS 12268 ( Part 4 ) : 1989
5.6 Operating Temperature ( TO )
The steam trap shall be tested to determine the temperature at
which the device operates and in particular the temperature at
which it passes its specified capacity.
5.7 Condensate Capacity ( QH or QC )
The steam trap shall be flow tested to determine its condensate
capacity throughout its operating -pressure range.
5.8 Live Steam Loss
The steam trap shall be tested to determine the amount of live
steam lost via the trap.
6 TEST METHODS
6.1 Shell Testing 6.2 Operational Check
6.1.1 The test fluid, the choice of which is left to the
discretion of the manufacturer, shall be either:
6.2.1 The steam trap shall be fed with steam, and condensate
shall be introduced intermittently.
a) water, which may contain a corrosion inhibitor, kerosene or
any other suitable liquid having a viscosity not greater than that
of water; and
b) steam, air or any other suitable gas.
6.2.2 When only steam is present, the steam trap shall close on
the introduction of condensate, the steam trap shall open ( the
time taken will vary as a function of the steam trap type 1; when
the condensate has been discharged, the steam trap shall again
close.
NOTE - Various statutory authorities require specific approval
of test procedures where the test is conducted using steam, air or
other gas.
6.2.3 The test is complete when at least one complete cycle has
been performed.
6.1.2 Any internal trim which will not withstand the test
pressure may be removed before the test.
6.2.4 Certain types of trap may be tested with air or water.
6.1.3 The trap shall be essentially vented of air when testing
with a liquid.
6.3 Determination of Minimum Operating Pressure
6.1.4 Traps shall not be plinted or otherwise coated with
materials capable of sealing against leakage before the shell
pressure test are com- pleted. Chemical corrosion protection
treatments and internal linings are permitted. If pressure tests in
the presence of a representative of the purchaser are specified,
painted traps from stock may be re-tested without removal of
paint.
6.3.1 Operational checks, as described in 5.2 shall be carried
out whilst successively reducing the test pressure until the steam
trap fails to open and close correctly.
6.3.2 The minimum operating pressure is the lowest test pressure
at which correct operation is observed.
6.1.5 Test equipment shall not subject the trap to externally
applied stresses which may affect the results of the tests.
6.1.6 The shell test shall be performed by applying pressure
inside the assembled trap with the ends closed.
6.4 Determination of Maximum Operating Pressure
6.4.1 The maximum operating pressure of the steam trap may be
verified by carrying out operational checks, as described in 5.2
whilst successively increasing the test pressure up to the steam
trap’s maximum operating pressure.
6.1.7 For all traps,~the hydraulic shell test shall be performed
at a pressure 1’5 time the maxi- mum allowable pressure at
20°C.
6.4.2 The steam trap shall open and close correctly throughout
the test.
6.1.8 For traps with a nominal diameter less than or equal to DN
50 in the pressure range up to PN 50, the shell test may be carried
out either using liquid at a pressure equal to 1’5 times the
maximum allowable pressure at 20°C or using gas at a pressure (
gauge pressure) or 6 ba; ( 0’6 MPa).
6.5 Determination of Maximum Operating Back Pressure
6.5.1 Operational checks, as described in 6.2, shall be carried
out with the outlet from the steam trap connected to a vessel in
which the pressure can be raised, independent of the test pressure
upstream of the steam trap.
6.1.9 Visually detectable leakage through the pressure retaining
walls is not acceptable.
6.1.10 Test durations shall not be less than those specified in
Table 1.
Table 1 Minimum Durations for Shell Tests
Nominal Trap Size
DN
DN Q 50
65 C DN G 200
250 & DN
Minimum Test Duration
S
IS
60
180
2
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IS 12268 ( Part 4 ) : 1989
6.7.2 The temperature of the condensate, measur- ed at the steam
trap’s inlet, at which the device opens, is the operating
temperature.
6.7.3 The operating temperatures are the temper- atures of the
condensate, measured at the inlet to the trap, at which the trap
passes its specified capacities.
6.8 Condensate Capacity Test
6.8.1 The capacity of the steam trap shall be determined by
measuring the amount of con- densate that is discharged from the
device under specified conditions of pressure differential and
condensate temperature.
6.8.2 The test shall be carried out with conden- sate at
different temperatures and at different pressures within the steam
trap’s operating range.
6.9 Determination of Live Steam Loss
6.5.2 Whilst maintaining a reference pressure at the steam
trap’s inlet, the pressure at its outlet shall be raised
successively until the steam trap fails to open and close
correctly.
6.5.3 The maximum operating back pressure is the highest
pressure applied to the steam trap’s outlet at which correct
operation is still observed.
6.6 Air Venting Capability Test
Air shall be introduced at a specified temperature into the trap
or upstream piping. The air venting capability shall be checked by
an air flow measurement carried out at minimum and maxi- mum
operating pressures, the temperature inside the trap being
recorded.
6.7 Determination of Operating Temperature
6.7.1 Steam shall be fed into the steam trap to effect closure.
Condensate, at saturated steam temperature, shaI1 then be
introduced and, unless the steam trap opens immediately, shall be
allowed to cool slowly at the steam trap’s inlet.
Several methods may be used to determine the amount of live
steam lost, if any, by the steam trap. The method to be used shal
be agreed to by the manufacturer and the purchaser.
3
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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 inspectian, 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 Standards
BIS is a statutory institution established under the Bureau oj’
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
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publications may be reproduced in any form without the prior
permission in writing 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 designations. 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:
Dot : No. TED 019 ( 0747 )
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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