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IS 12268-4 (1989): Shipbuilding - Automatic Steam Traps forMarine Use, Part 4: Performance Test [TED 19: MarineEngineering and Safety Aids]

--\ 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

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 ).

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

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

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

Standard Mark

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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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