ANSI FCI 85-1-2011 Standard for Production Testing for Steam Traps《疏水阀产品测试标准》.pdf

1、 ANSI/FCI 85-1-2011 AMERICAN NATIONAL STANDARDSTANDARD FOR PRODUCTION TESTING OF STEAM TRAPS Fluid Controls Institute, Inc. Sponsor: Fluid Controls Institute, Inc. 1300 Sumner Ave Cleveland, Ohio 44115-2851 ANSI/FCI 85-1-2011 AMERICAN NATIONAL STANDARD Standard for Production Testing of Steam Traps

2、Sponsor Fluid Controls Institute, Inc. iiAmericanNationalStandardAmerican National Standard implies a consensus of those substantially concerned with its scope and provisions. An American National Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The exis

3、tence of an American National Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing or using products, processes, or procedures not conforming to the standard. American National Standards are subject to periodic revie

4、w and users are cautioned to obtain the latest editions. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five

5、 years from the date of publication. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Sponsored and published by: FLUID CONTROLS INSTITUTE, INC. 1300 Sumner Avenue Cleveland, OH 44115-2851 Phn:

6、 216/241-7333 Fax: 216/241-0105 E-Mail: fcifluidcontrolsinstitute.org URL: www.fluidcontrolsinstitute.org Copyright 2011 by Fluid Controls Institute, Inc. All Rights Reserved No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior

7、written permission of the publisher. Suggestions for improvement of this standard will be welcome. They should be sent to the Fluid Controls Institute, Inc. Printed in the United States of America iiiivCONTENTS PAGE Foreword iv 1. Scope . 1 2. Definitions 1 3. Technical Terms. 1-2 4. Production Test

8、s . 2 5. Operating Characteristics Test 2 6. Test Methods . 2-3 TABLE Table 1 . 3 vForeword (This foreword is included for information only and is not part of ANSI/FCI 85-1-2011, Standard for Production Testing of Steam Traps.) The following voluntary standard has been developed as a cooperative eff

9、ort by the Steam Trap Section of the Fluid Controls Institute, Inc. to assist manufacturers, users and specifiers of the products to comply with production and performance characteristics of automatic steam traps. FCI recognizes the need to periodically review and update this standard. Suggestions f

10、or improvement should be forwarded to the Fluid Controls Institute, Inc., 1300 Sumner Avenue, Cleveland, Ohio 44115-2851. All constructive suggestions for expansion and revision of this standard are welcome. In April 2003, the Steam Trap Section members agreed to revise the standard, in part to refl

11、ect a change in the ASME Code on hydrotest pressure. The existence of a Fluid Controls Institute (FCI) standard does not in any respect preclude any member or non-member from manufacturing or selling products not conforming to this standard nor is the FCI responsible for its use. 1ANSI/FCI 85-1-2011

12、 AMERICAN NATIONAL STANDARD STANDARD FOR PRODUCTION TESTING OF STEAM TRAPS 1. SCOPE 1.1 This standard specifies production and performance tests that are considered applicable to steam traps. 1.2 These tests may be conducted to ensure the correct functioning of a steam trap or to evaluate the perfor

13、mance of particular designs, either currently in production or under consideration for production. 2. DEFINITIONS 2.1 Steam trap - A self-contained valve which automatically drains the condensate from a steam containing enclosure while remaining tight to live steam, or, if necessary, allowing steam

14、to flow at a controlled or adjusted rate. Most steam traps will also pass non-condensable gases while remaining tight to live steam. 2.2 Production tests - Those tests carried out by the manufacturer to confirm that the steam trap functions correctly. These tests may be witnessed by the purchaser or

15、 his representative. In this case, these tests are referred to as acceptance tests. 2.3 Performance characteristic tests - Carried out to determine the operational characteristics of a particular design of steam trap. 3. TECHNICAL TERMS 3.1 Nominal Size (DN) - A numerical designation of size which i

16、s common to all components used in a piping system other than components designated by outside diameter. It is used for reference purposes and is normally only loosely related to manufacturing dimensions (inches). 3.2 Nominal Pressure (PN) - Internal pressure at a temperature of 68oF (20C) which is

17、used as a basis in the determination of limitations of the steam trap (lb/in2). 3.3 Maximum Allowable Pressure (PMA) - Maximum pressure that the shell of the steam trap can withstand permanently at a given temperature (lb/in2). 3.4 Maximum Operating Pressure (PMO) - Pressure for which a steam trap i

18、s rated by the manufacturer. This pressure is normally a function of the limitations related to the internal equipment of the steam trap (lb/in2). 3.5 Operating Pressure (PO) - Pressure measured at the inlet of the steam trap under operating conditions (lb/in2). 3.6 Operating Back Pressure (POB) - P

19、ressure measured at the outlet of the steam trap under operating conditions (lb/in2). 3.7 Maximum Operating Back Pressure (PMOB) -Maximum permissible pressure at the outlet of the steam trap allowing correct functioning (lb/in2). 3.8 Operating Differential Pressure (P) - Difference between the opera

20、ting pressure and the operating back pressure (lb/in2). 3.9 Maximum Differential Pressure (PMX) - Maximum difference between operating pressure and operating back pressure (lb/in2). 3.10 Minimum Differential Pressure (PMN) - Minimum difference between operating pressure and operating back pressure (

21、lb/in2). 3.11 Test Pressure (PT) - Pressure applied to the steam trap under test (lb/in2). 3.12 Maximum Test Pressure (PTMX) -Maximum test pressure of the steam trap including its internal mechanism (lb/in2). 3.13 Hydrostatic Proof Test Pressure (PTHP) - The hydrostatic proof test used in determinin

22、g PMA with consideration given to operating temperature (lb/in2). 3.14 Basic Temperature (TB) - Temperature taken into consideration in the determination of the limitations of the steam trap (oF). 3.15 Maximum Allowable Temperature (TMA) - Maximum temperature to which the shell of the steam trap can

23、 be raised permanently (oF). 3.16 Operating Temperature (TO) - Temperature measured at the inlet of the steam trap under operating conditions (oF). 3.17 Cold Condensate Capacity (QC) - Maximum mass of condensate that the steam trap can discharge in 1 hour at a given pressure and a temperature of 68o

24、F + 25oF (20oC + 14oC) the trap being fully open (lb/hr). 3.18 Hot Condensate Capacity (QH) - Maximum mass of condensate that a steam trap can discharge in 1 hour at a given pressure and temperature (lb/hr). 4. PRODUCTION TESTS 4.1 Product Inspection: Samples of the finished traps shall be visually

25、examined and dimensionally checked to ensure that the traps correspond to the stated specification and are marked in accordance with FCI 69-1 Section 5. 4.2 Shell Leak Testing: Each steam trap shall be tested to confirm the integrity of its shell under pressure. Further details are given in 6.1. 4.3

26、 Operational Check: Sample steam traps shall be tested to ensure that they open to discharge condensate and close satisfactorily. Further details are given in 6.2. This test does not apply to the labyrinth (orifice) steam traps. 4.4 Notice for Acceptance Test: If the purchaser wishes to witness the

27、tests, this shall be specified in the order. 5. OPERATING CHARACTERISTICS TEST A manufacturer may describe the operations of a particular type of steam trap by referring to one or more of the following performance characteristics tests. A brief explanation of the derivation of each characteristic is

28、 given below. Further details on the appropriate test methods are specified in 6.1 to 6.9. 5.1 Minimum Operating Pressure - The steam trap shall be tested to determine the minimum pressure (atmospheric or above) at which correct opening and closing will occur. 5.2 Maximum Operating Pressure (PMO) -

29、The steam trap shall be tested to determine the maximum pressure at which correct opening and closing will occur. 5.3 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.

30、4 Air Venting Capability - The steam trap shall be tested to determine its ability to discharge air and other non-condensable gases. 5.5 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

31、it passes its specified capacity. 5.6 Condensate Capacity (QH or QC) - The steam trap shall be flow tested to determine its condensate capacity throughout its operating pressure range. 5.7 Live Steam Loss - The steam trap shall be tested to determine the amount of live steam lost via the trap. 6. TE

32、ST METHODS 6.1 Shell Leak Testing - The test fluid, the choice of which is left to the discretion of the manufacturer, shall be either: water, which may contain a corrosion inhibitor, kerosene or any other suitable liquid having a viscosity not greater than that of water, or steam, air or any other

33、suitable gas. Any internal trim which will not withstand the test pressure may be removed before the test. The trap shall be vented of air when testing with a liquid. Traps shall not be coated with materials capable of sealing against leakage before the shell pressure tests are completed. Chemical c

34、orrosion protection treatments and internal lining 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. Test equipment shall not subject the trap to externally applied stresses which m

35、ay affect the results of the tests. The shell tests shall be performed by applying pressure inside the assembled trap with ends closed. The shell test using liquid shall be performed at a pressure of 1.3 times the maximum allowable pre-ssure (PMA) at 68oF (20oC). Traps no larger than 2“ pipe size (D

36、N50) and for pressure ratings not exceeding ANSI 600 pounds (PN100) may be tested on saturated steam at their maximum operating pressure (PMO) or on air (or gas) at 68oF (20oC) and 80 psi (6 bar). Visually detectable leakage through the pressure retaining walls is not acceptable. Test 23durations sh

37、ould not be less than those specified in the table below. TABLE I MINIMUM DURATIONS FOR ALL SHELL TESTS Nominal Trap Size Minimum Test Duration Thru 2“ (DN50) 15 seconds 2 1/2“ - 8“ (DN65-DN200) 60 seconds 10“ (DN250) and over 180 seconds 6.1.1. Production Test at Reduced Pressure - Traps with inter

38、nal trim which will not withstand the 80 psig air test may be tested at 40 psig provided that (1) the traps are regularly produced in quantity, and (2) representative samples of each production lot of the trap have passed a shell leak tests using air at 80 psig and also using liquid at 1.3 times the

39、 maximum allowable pressure. 6.2 Operational Check - The steam trap shall be fed with steam, and condensate shall be introduced intermittently. 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

40、 of the steam trap type). When the condensate has been discharged, the steam trap shall close again when steam enters the trap. The test is complete when at least one complete cycle has been performed. Certain types of traps may be tested with air or water. 6.3 Determination of Minimum Operating Pre

41、ssure - Operational checks, as described in 6.2, shall be carried out at various test pressures until the steam trap fails to open and close correctly. The minimum operating pressure is the lowest test pre-ssure at which correct operation is observed. 6.4 Determination of Maximum Operating Pressure

42、- The maximum operating pressure of the steam trap may be verified by carrying out operational checks, as described in 6.2, while successively increasing the test pressure up to the steam traps maximum operating pressure. The steam trap shall open and close correctly throughout the test. 6.5 Determi

43、nation of Maximum Operating Back Pressure - 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. While maintaining a reference pressure

44、 at the steam traps inlet, the pressure at its outlet is to be raised successively until the steam trap fails to open and close correctly. The maximum operating back pressure is the highest pressure applied to the steam traps outlet at which correct operation is still observed. 6.6 Determination of

45、Air Venting Capability - 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 in accordance with an ASME procedure under development. 6.7 Determination of Operating Temperature - Steam

46、shall be fed into the steam trap to effect closure. Condensate, at saturation steam temperature, shall then be introduced, and, unless the steam trap opens immediately, shall be allowed to cool slowly at the steam traps inlet. The operating temperature is the temperature of the condensate measured a

47、t the inlet to the trap, which the trap opens sufficiently to pass its specified capacity. This test may be carried out at different pressures within the steam traps operating range. 6.8 Determination of Condensate Capacity - The capacity of the steam trap shall be determined by measuring the amount

48、 of condensate that is discharged from the device under specified conditions of pressure, pressure differential, and condensate temperature. The test shall be carried out in accordance with ANSI/ASME PTC 39.1. 6.9 Determination of Live Steam Loss - This test shall be carried out in accordance with ANSI/ASME PTC 39.1.