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    2. 最新版!ISO 10497-2010 阀门测试 阀门防火型式试验要求(英文版)

      2017-11-01 0

      English Version

      Testing of valves - Fire type-testing requirements (ISO 10497:2010)

      This European Standard was approved by CEN on 26 January 2010.

      CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European

      Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national

      standards may be obtained on application to the CEN Management Centre or to any CEN member.

      This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

      under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the

      official versions.

      CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

      Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

      Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

      EUROPEAN COMMITTEE FOR STANDARDIZATION

      COMITé EUROPéEN DE NORMALISATION

      EUROP?ISCHES KOMITEE FüR NORMUNG

      Management Centre: Avenue Marnix 17, B-1000 Brussels

      Foreword

      This document (EN ISO 10497:2010) has been prepared by Technical Committee ISO/TC 153 "Valves" in collaboration with Technical Committee CEN/TC 69 “Industrial valves” the secretariat of which is held by AFNOR.
      This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2010, and conflicting national standards shall be withdrawn at the latest by August 2010.
      Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
      This document supersedes EN ISO 10497:2004.
      According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,Sweden, Switzerland and the United Kingdom.

      Endorsement notice

      The text of ISO 10497:2010 has been approved by CEN as a EN ISO 10497:2010 without any modification.

      Contents Page
      Foreword ...........................................................................................................................................................iv
      Introduction........................................................................................................................................................v
      1 Scope.....................................................................................................................................................1
      2 Normative references...........................................................................................................................1
      3 Terms and definitions ...........................................................................................................................1
      4 Test conditions.....................................................................................................................................2
      4.1 Direction and conditions for valves to be tested ...............................................................................2
      4.2 Pressure relief provision ......................................................................................................................3
      5 Fire test method....................................................................................................................................3
      5.1 General warning ...................................................................................................................................3
      5.2 Principle.................................................................................................................................................3
      5.3 Apparatus..............................................................................................................................................3
      5.4 Test fluid................................................................................................................................................4
      5.5 Test fuel.................................................................................................................................................4
      5.6 Procedure..............................................................................................................................................4
      6 Performance........................................................................................................................................10
      6.1 General ................................................................................................................................................10
      6.2 Through-seat leakage during burn period ........................................................................................10
      6.3 External leakage during burn and cool-down periods ....................................................................10
      6.4 Low-pressure test through-seat leakage after cool-down ..............................................................11
      6.5 Operability...........................................................................................................................................11
      6.6 External leakage following operational test .....................................................................................11
      6.7 Test report...........................................................................................................................................12
      7 Qualification of other valves by representative size, pressure rating and materials of
      construction........................................................................................................................................13
      7.1 General ................................................................................................................................................13
      7.2 Materials of construction...................................................................................................................13
      7.3 Qualification of valves by nominal size ............................................................................................14
      7.4 Qualification of valves by pressure rating........................................................................................14
      7.5 Special marking ..................................................................................................................................14
      Bibliography.....................................................................................................................................................16

      Foreword
      ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
      (ISO member bodies). The work of preparing International Standards is normally carried out through ISO
      technical committees. Each member body interested in a subject for which a technical committee has been
      established has the right to be represented on that committee. International organizations, governmental and
      non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
      International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
      International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
      The main task of technical committees is to prepare International Standards. Draft International Standards
      adopted by the technical committees are circulated to the member bodies for voting. Publication as an
      International Standard requires approval by at least 75 % of the member bodies casting a vote.
      Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
      rights. ISO shall not be held responsible for identifying any or all such patent rights.
      ISO 10497 was prepared by Technical Committee ISO/TC 153, Valves, Subcommittee SC 1, Design,
      manufacture, marking and testing.
      This third edition cancels and replaces the second edition (ISO 10497:2004), which has been technically
      revised.

      Introduction
      This International Standard covers the requirements and method for evaluating the performance of valves
      when they are exposed to defined fire conditions. The performance requirements establish limits of
      acceptability of a valve, regardless of size or pressure rating. The burn period has been established to
      represent the maximum time required to extinguish most fires. Fires of longer duration are considered to be of
      major magnitude, with consequences greater than those anticipated in the test.
      The test pressure during the burn is set at 0,2 MPa (2 bar) for soft-seated valves rated PN 10, PN 16, PN 25
      and PN 40, Class 150 and Class 300, to better simulate the conditions that would be expected in a process
      plant when a fire is detected and pumps are shut down. In this case, the source of pressure in the system is
      the hydrostatic head resulting from liquid levels in towers and vessels. This situation is approximated by this
      lower test pressure.
      In production facilities, valves are typically of a higher rating and the pressure source is not easily reduced
      when a fire is detected. Therefore, for all other valves, the test pressure during the burn is set at a higher
      value to better simulate the expected service conditions in these facilities.
      Use of this International Standard assumes that the execution of its provisions is entrusted to appropriately
      qualified and experienced personnel, because it calls for procedures that can be injurious to health, if
      adequate precautions are not taken. This International Standard refers only to technical suitability and does
      not absolve the user from legal obligations relating to health and safety at any stage of the procedure.

      Testing of valves — Fire type-testing requirements

      1 Scope
      This International Standard specifies fire type-testing requirements and a fire type-test method for confirming
      the pressure-containing capability of a valve under pressure during and after the fire test. It is not applicable to
      the testing requirements for valve actuators other than manually operated gear boxes or similar mechanisms
      when these form part of the normal valve assembly. Other types of valve actuators (e.g. electrical, pneumatic
      or hydraulic) can need special protection to operate in the environment considered in this valve test, and the
      fire testing of such actuators is outside the scope of this International Standard.
      Fire test certificates of valves previously tested according to previous editions of ISO 10497 and to similar
      internationally recognized fire test standards are also acceptable.
      NOTE For the purposes of this International Standard, the terms “fire type-test” and “fire test” are synonymous.
      2 Normative references
      The following referenced documents are indispensable for the application of this document. For dated
      references, only the edition cited applies. For undated references, the latest edition of the referenced
      document (including any amendments) applies.
      ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
      and designation
      IEC 60584-2, Thermocouples — Part 2: Tolerances
      3 Terms and definitions
      For the purposes of this document, the following terms and definitions apply.
      3.1
      nominal size
      DN
      alphanumeric designation of size for components of a pipework system, which is used for reference purposes,
      comprising the letters DN followed by a dimensionless whole number which is indirectly related to the physical
      size, in millimetres, of the bore or outside diameter of the end connections
      NOTE Adapted from ISO 6708:—, definition 2.1.
      3.2
      nominal pressure
      PN
      numerical designation relating to pressure which is a convenient rounded number for reference purposes, and
      which comprises the letters PN followed by the appropriate reference number
      NOTE 1 It is intended that all equipment of the same nominal size (DN) designated by the same PN number have
      compatible mating dimensions.

      NOTE 2 The maximum allowable pressure depends on materials, design and working temperatures, and is selected
      from the tables of pressure/temperature ratings given in the appropriate standards.
      NOTE 3 Adapted from ISO 7268:—, Clause 2.1.
      3.3
      NPS
      alphanumeric designation of size for components of a pipework system, which is used for reference purposes,
      and which comprises the letters NPS followed by a dimensionless number indirectly related to the physical
      size of the bore or outside diameter of the end connections
      NOTE The number following the letters NPS does not represent a measurable value and is not intended to be used
      for calculation purposes except where specified in the relevant standard.
      3.4
      class
      alphanumeric designation used for reference purposes related to a combination of mechanical and
      dimensional characteristics of a component of a pipework system, which comprises the word “Class” followed
      by a dimensionless whole number
      NOTE The number following the word “Class” does not represent a measurable value and is not intended to be used
      for calculation purposes except where specified in the relevant standard.
      3.5
      symmetric seated valve
      valve with an internal construction, which has a plane of symmetry perpendicular to the axis of the body ends
      NOTE This is a valve where both seat and sealing elements are identical.
      3.6
      asymmetric seated valve
      valve with an internal construction, which has no plane of symmetry perpendicular to the axis of the body ends
      NOTE This is a valve with a single seat offset from the shaft centreline.
      3.7
      soft seat
      soft seal
      seat or sealing element made from, or including, a significant amount of thermoplastic or elastomeric material
      4 Test conditions
      4.1 Direction and conditions for valves to be tested
      4.1.1 Symmetric seated valves intended by the manufacturer for bi-directional installation shall be tested in
      one direction only.
      4.1.2 Asymmetric seated valves intended by the manufacturer for bi-directional installation shall be tested
      by carrying out the burn test procedure twice, once in each direction of the potential installation.
      The same valve may be refurbished and re-tested, or another, identical, valve may be tested in the other
      direction.
      4.1.3 Valves intended solely for unidirectional installation shall be clearly and permanently marked as such,
      and shall be tested in the stated direction of installation.

      4.1.4 If the valve being tested is fitted with a gearbox or other such manual device, only that particular
      assembly shall qualify. If a valve can be supplied with or without a gearbox, testing with a gearbox fitted shall
      qualify valves without a gearbox, but not the converse.
      4.1.5 Valves (and gearboxes) shall not be protected with insulation material of any form during testing,
      except where such protection is part of the design of the component(s).
      4.2 Pressure relief provision
      If the valve under test incorporates a pressure relief device as part of its standard design and if this device
      activates during the fire test, the test shall be continued and any leakage to atmosphere from the device shall
      be measured and counted as external leakage. If the design is such that the device vents to the downstream
      side of the valve, any leakage shall be counted as through-seat leakage (see 5.6.11 and 5.6.13).
      However, the test shall be stopped if the system pressure relief device described in 5.3.2.8 activates.
      5 Fire test method
      5.1 General warning
      Fire testing of valves is potentially hazardous and it is essential that the safety of personnel be given prime
      consideration. Given the nature of the fire test and the possibility of weaknesses in the design of the test valve
      and test equipment, hazardous rupture of the pressure boundary could occur. Adequate shields in the area of
      the test enclosure and other appropriate means for the protection of personnel are necessary.
      5.2 Principle
      A closed valve, completely filled with water under pressure, is completely enveloped in flames with an
      environmental temperature in the region of the valve of 750 °C to 1 000 °C for a period of 30 min. The
      objective is to completely envelop the valve in flames to assure that the seat and sealing areas are exposed to
      the high burn temperature. The intensity of the heat input shall be monitored using thermocouples and
      calorimeter cubes as specified in 5.6.7 and 5.6.8. During this period the internal and external leakage is
      recorded. After cool-down from the fire test, the valve is hydrostatically tested to assess the pressurecontaining
      capability of the valve shell, seats and seals.
      5.3 Apparatus
      5.3.1 General
      The test equipment shall not subject the valve to externally applied stress affecting the results of the test.
      Schematic diagrams of recommended systems for fire type-testing of valves are given in Figure 1.
      Potential pipework-to-valve end connection joint leakage is not evaluated as part of the test and is not
      included in the allowable external leakage (see 6.3 and 6.6). For the purposes of this test, it may be necessary
      to modify these joints to eliminate leakage.
      The test equipment shall be designed such that if the nominal diameter of the pipework situated immediately
      upstream of the test valve is larger than DN 25 or one-half the DN of the test valve, the pipework shall be
      enveloped in flames for a minimum distance of 150 mm from the test valve. The diameter of the upstream
      pipework shall be sufficient to deliver a flow rate in excess of the maximum allowable leak rate for the size of
      the valve being tested.
      The pipework downstream of the test valve shall be at least DN 15 and shall be inclined such that the
      downstream side is fully drained.

      The flame source shall be at least 150 mm minimum away from the valve or any calorimeters, and should
      have sufficient capacity to completely envelop the valve in flames.
      The enclosure containing the valve shall provide a horizontal clearance of a minimum of 150 mm between any
      part of the test valve and the enclosure, and the height of the enclosure above the top of the test valve shall
      be a minimum of 150 mm.
      5.3.2 Specific apparatus
      5.3.2.1 Vapour trap, to minimize the cooling effect of the upstream liquid. See Figure 1 (7).
      NOTE In 5.3.2 and 5.6, the numbered items in parentheses refer to the item numbers for the apparatus in Figure 1.
      5.3.2.2 Industrial pressure measurement devices having a full-scale reading of between 1,5 and 4
      times the pressure being measured. The accuracy of each test device used at any point on the scale shall be
      within 3 % of its maximum scale value for readings taken both up and down the scale, with either increasing or
      decreasing pressure. See Figure 1 (6, 12).
      5.3.2.3 Calorimeter cubes, of carbon steel in accordance with the design and dimensions shown in
      Figure 2, with a thermocouple of the accuracy specified in 5.3.2.4, located in the centre of each cube.
      Calorimeter cubes shall be scale-free before exposure to the fire environment.
      5.3.2.4 Flame environment and valve body thermocouples, of an accuracy at least equal to tolerance
      class 2 for type B or tolerance class 3 for other types, as specified in IEC 60584-2. See Figure 1 (11).
      5.3.2.5 Containers, of a size suitable for collecting the water leaked from the valve under test. See
      Figure 1 (16).
      5.3.2.6 Calibrated sight gauge, or device for measuring the water used during the test. See
      Figure 1 (4).
      5.3.2.7 Calibrated device for measuring the leakage water collected during the test.
      5.3.2.8 Pressure relief provision, incorporated in the system, consisting of a pressure relief valve to
      relieve the test valve centre cavity pressure to the atmosphere, to protect against potential rupture of the
      valve, if it is designed such that liquid can be trapped in the cavity. See Figure 1 (12).
      The pressure relief valve setting shall be
      ? either that determined by the valve manufacturer from data obtained by hydrostatic pressure testing of
      valves of the same size and type as the fire-tested valve, or
      ? when pressure test data are not available, a setting not greater than 1,5 times the maximum allowable
      pressure at 20 °C.
      5.4 Test fluid
      The test fluid used shall be water.
      5.5 Test fuel
      The test fuel shall be gaseous.
      5.6 Procedure
      NOTE The numbered items in parentheses refer to the item numbers for the apparatus in Figure 1.

      5.6.1 Mount the test valve in the test apparatus such that the stem and bore of the valve are in the
      horizontal position. Mount a valve that operates in only one direction (unidirectional) in their normal operating
      position.
      Locate the flame environment, body thermocouples and calorimeter cubes in the positions shown in Figures 3
      and 4, as appropriate.
      For soft-seated valves up to DN 100 or NPS 4 and pressure ratings up to PN 40, Class 300, use two flame
      environment thermocouples, two body thermocouples and two calorimeter cubes as shown in Figure 3.
      For all other valves, use two flame environment thermocouples and two calorimeter cubes as shown in
      Figure 4. For valves DN 200 or NPS 8 and larger, use a third calorimeter cube as shown in Figure 4.
      5.6.2 With the test valve in the partially open position, open the water supply valve, the shut-off valve (5),
      the vent valves (14) and the shut-off valve (13) to flood the system and purge the air. When the system is
      completely filled with water, close the shut-off valve (13), the vent valves (14) and the water supply valve.
      Pressurize the system with water to a test pressure of 1,4 times the maximum allowable pressure at 20 °C;
      the actual test pressure may be rounded up to the next highest bar1). Check for leaks in the test apparatus
      and eliminate as necessary. Release the pressure, close the test valve and open the shut-off valve (13).
      5.6.3 If the valve under test is of the upstream sealing type, determine the volume of water that is trapped
      between the upstream seat seal and the downstream seat seal when the valve is closed. Record this volume.
      It is assumed that, during the fire type-test, this volume of water would flow through the valve and pass the
      downstream seat seal to be collected in the container (16). Since this volume has not actually leaked through
      the upstream seat seal, it is deducted from the total volume collected in the downstream container when
      determining the through-seat leakage (see 5.6.11).
      5.6.4 Pressurize the system to one or the other of the following pressures, as appropriate:
      a) for soft-seated valves rated PN 10, PN 16, PN 25 and PN 40, Class 150 and Class 300, the low test
      pressure at 0,2 MPa (2 bar);
      b) for all other valves, the high test pressure at 75 % of the maximum allowable seat pressure at 20 °C.
      Tolerance on all test pressures is ± 10 %.
      Maintain this test pressure during the burn and cool-down periods, momentary pressure losses of up to 50 %
      of the test pressure being permitted provided that the pressure recovers within 2 min and the cumulative
      duration is less than 2 min.
      5.6.5 Record the reading on the calibrated sight gauge or device (4). Empty the container (16).
      5.6.6 Adjust the test system, excluding the test valve, during the test period to maintain the temperatures
      and pressures required.
      5.6.7 Open the fuel supply, establish a fire and monitor the flame environment temperature throughout the
      burn period of 5
      30 0 min. + Check that the average temperature of the two flame environment thermocouples
      (11) reaches 750 °C within 2 min from the start of the burn period, i.e. from ignition of the burners. Maintain
      the average temperature between 750 °C and 1 000 °C, with no reading less than 700 °C for the remainder of
      the burn period of 30 min.

      1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

      a) Pump as pressure source

      Figure 1 — Recommended systems (continued)

      b) Compressed gas as pressure source

      Key
      1 pressure source
      2 pressure regulator and relief
      3 vessel for water
      4 calibrated sight gauge
      5 shut-off valve
      6 pressure gauge
      7 piping arranged to provide vapour trap (see 5.3.2)
      8 enclosure for test
      9 test valve mounted horizontally with stem in horizontal position (see 5.6.1)
      10 calorimeter cubes (see 5.3.2)
      11 flame environment and body thermocouples (see 5.3.2)
      12 pressure gauge and relief valve (see 5.3.2)
      13 shut-off valve
      14 vent valve
      15 condenser
      16 container (see 5.3.2)
      17 check valve
      a Clearance of 150 mm.
      b Water supply.
      c Fuel gas supply and burners.
      d Slope.
      Figure 1 — Recommended systems

      Key

      1 pipe
      2 pipe thread Rc 1/8 complying with ISO 7-1
      3 thermocouple well
      4 38 mm flame calorimeter cube
      Figure 2 — Calorimeter cube design and dimensions
      5.6.8 The average temperature of the calorimeter cubes shall be 650 °C within 15 min of starting the burn
      period. For the remainder of the burn period, maintain the minimum average temperature of 650 °C, with no
      temperature falling to less than 560 °C. For valves subjected to the low-pressure test (see 5.6.1), the body
      thermocouple shall maintain 590 °C (1 100 °F) for at least 5 min and the bonnet thermocouple shall maintain
      650 °C (1 200 °F) for at least 15 min of the burn period. The burn period may be extended by up to 5 min in
      order to achieve this requirement.
      5.6.9 Record instrument readings (6, 10, 11, 12) every 30 s during the burn period. Thermocouples should
      be numbered and individual records of temperature should be recorded.
      5.6.10 At the end of the burn period, 5
      30 0 min, + shut off the fuel supply.
      5.6.11 Immediately determine the amount of water collected in the container (16) and establish the total
      through-seat leakage during the burn period. If the test valve is an upstream sealing type (see 5.6.3), deduct
      the volume of water trapped between the upstream seat seal and the downstream seat seal. Continue
      collecting water in the container (16) for use in establishing the external leakage rate of the test valve during
      the burn and cool-down periods.

      5.6.12 Within 5 min of extinguishing the fire, force-cool the test valve with water so that its external surface
      temperature remains below 100 °C; the time for cooling shall not exceed 10 min. Record the time taken to
      force-cool the external surface of the valve below 100 °C.
      WARNING — The internal parts of the valve could remain at significantly higher temperatures than the
      external surface of the valve. Following the force cooling with water, additional time may be necessary
      to allow internals to cool to less than 100 °C.
      5.6.13 Check and adjust the test pressure in accordance with 5.6.4. Record the readings on the sight
      gauge (4) and determine the quantity of water in the container (16). Record any leakage through the external
      pressure relief device if fitted as part of the standard design. The figures are used to calculate the total
      external leakage throughout the burn and cool-down periods.
      5.6.14 For valves PN 100 or Class 600 and lower, decrease or stabilize the pressure to the low test pressure
      at 0,2 MPa (2 bar), and measure the through-seat leakage over a 5 min period.
      5.6.15 For all valves, increase or stabilize the test pressure to the high test pressure, then close the shut-off
      valve (13). Operate the test valve against the test pressure to the fully open position.
      5.6.16 Stabilize the pressure to the high test pressure and measure the external leakage over a 5 min period.

      Key

      1 bonnet thermocouple
      2 body thermocouple
      3 38 mm flame calorimeter cubes
      4 flame thermocouples
      a The body thermocouple is installed in this area. When installed, the body and bonnet thermocouples are recessed
      into the valve body/bonnet a distance of 1/2 the thickness of the wall or 13 mm, whichever is the lesser.
      b From the stem seal.
      Figure 3 — Location of temperature measurement sensors — Soft-seated valves up to DN 100 —
      NPS 4 — PN 10, PN 16, PN 25 and PN 40 — Class 150 and Class 300

      Key

      1 38 mm calorimeter cubes
      2 flame thermocouples
      a Additional calorimeter cube added for DN 200 (8 in) and above.
      b From the stem seal.
      NOTE These other valves include soft-seated valves larger than DN 100, NPS 4, PN 10, PN 16, PN 25 and PN 40,
      Class 150 and Class 300, and all valve sizes > PN 40, Class 300.
      Figure 4 — Location of temperature measurement sensors for all other valves
      6 Performance
      6.1 General
      Valves tested in accordance with Clause 5 shall be in accordance with 6.2 to 6.7.
      6.2 Through-seat leakage during burn period
      For the low-pressure test, the average through-seat leakage at low test pressure during the burn period
      (see 5.6.11) shall not exceed the value given in Table 1.
      For the high-pressure test, the average through-seat leakage at high test pressure during the burn period
      (see 5.6.11) shall not exceed the value given in Table 1.
      6.3 External leakage during burn and cool-down periods
      For the low-pressure test, the average external leakage, not including through-seat leakage, during the burn
      and cool-down periods (see 5.6.13) shall not exceed the value given in Table 1.
      For the high-pressure test, the average external leakage, not including through-seat leakage, during the burn
      and cool-down periods (see 5.6.13) shall not exceed the value given in Table 1.

      6.4 Low-pressure test through-seat leakage after cool down
      The maximum through-seat leakage shall not exceed the value given in Table 1.
      6.5 Operability
      After the fire test, the valve shall be unseated from the closed position against the high test pressure and
      moved to the fully open position (see 5.6.15) using the operator fitted to the test valve. Extension handles
      shall be allowed to protect the operator from risks associated with potential loss of containment during the
      valve operation provided that this does not result in an applied torque that is higher than that available from
      the fitted operator and the manufacturer’s published torque value. Failure of the valve to operate at this torque
      means failure of the fire test.
      6.6 External leakage following operational test
      The average external leakage of the valve in the open position at the high test pressure (see 5.6.16) shall not
      exceed the value given in Table 1.
      NOTE External leakage does not include potential leakage from the pipework-to-valve end connection (see 5.3.1).

      Table 1 — Maximum leak rates

      6.7 Test report

      The test report shall include the following information:
      a) date of fire type-test;
      b) place at which the fire type-test was conducted;
      c) specification used for the fire type-test (including date of publication and applicable amendments);
      d) valve manufacturer's name and address;
      e) statement that the fire-tested valve has passed all the required hydrostatic, air type and production
      pressure tests required by the standard to which the valve was manufactured (manufacturer's statement
      may be accepted);
      f) full description of the valve tested, including nominal size, pressure rating designation, type (e.g. gate),
      weight, whether reduced or full bore, material of body/bonnet, trim material and manufacturer's reference
      number;
      g) markings on the valve and their locations, including manufacturer's nameplate date (if fitted);
      h) manufacturer's sectional drawing of the valve and a detailed parts list, including materials, of all valve
      components tested, identified in the text by identification number (drawing number) and revision and date
      of issue of documents;
      i) statement as to whether or not a gear box is fitted to the test valve and, if fitted, the type, manufacturer's
      name, model number and mechanical advantage;
      j) test pressure during burn and cool-down;
      k) time of test start, i.e. of ignition of burners;
      l) temperature recorded at start and at 30 s intervals throughout duration of test, with individual records for
      each thermocouple;
      m) through-seat leakage during burn period (see 6.2);
      n) external leakage during burn and cool-down periods (see 6.3);
      o) time required for valve to cool to 100 °C;
      p) through-seat leakage (low-pressure test) for valves PN 100 and Class 600 and lower;
      q) statement as to whether or not the test valve has been unseated and moved to the fully open position
      (see 6.5);
      r) external leakage in the open position (see 6.6);
      s) whether the valve is asymmetric and intended for bi-directional installation (test results in both directions);
      t) observations made during the course of the test that may have bearing on the results provided;
      u) declaration as to whether or not the test valve complied with the requirements of this International
      Standard;
      v) indication on the cover sheet or table of contents of the report of the total number of pages contained in
      the document (including drawings), with each page being numbered, e.g. 1/12, 2/12;
      w) name and affiliation of individuals witnessing the fire test;
      x) body cavity set relief pressure and setting.

      7 Qualification of other valves by representative size, pressure rating and materials
      of construction
      7.1 General
      Instead of testing each nominal size and nominal pressure rating of a given valve design, all valves of the
      same basic design as the test valve may be deemed to have been fire-tested, subject to the following
      limitations.
      a) A test valve may be used to qualify valves larger than the test valve, but not exceeding twice the nominal
      size of the test valve (see 7.3). A size DN 200, NPS 8 or Nominal Size 9 test valve qualifies all larger
      sizes. If the minimum size of a given range of valves is greater than DN 200, NPS 8 or Nominal Size 9,
      then the minimum size of the range shall be tested to qualify all sizes.
      b) A DN 50, NPS 2 or Nominal Size 2 1/16 valve may be used to qualify all smaller sizes of valve of the
      same types. If the maximum size of a given range of valves is smaller than DN 50, NPS 2 or Nominal
      Size 2 1/16, then the maximum size of the range shall be tested to qualify all sizes.
      c) A test valve may be used to qualify valves with higher PN or Class ratings but not exceeding twice the PN
      or Class rating of the test valve, except as shown in 7.4.
      A reduced bore (or Venturi pattern) test valve may be used to qualify a smaller nominal size full bore (or
      regular pattern) valve when the components associated with the obturator, seat seals and stem are
      identical in design and size. Leakage rates need to be those of the smaller full bore valve.
      d) The type of valve body ends are not considered by this International Standard. However, the mass of the
      valve is determined in part by the body end type. For qualification to the present International Standard,
      and providing that all other qualification criteria have been met, valves with ends different to those of the
      test valve may also qualify provided that
      ? their mass is greater than that of the test valve, or
      ? their mass is not less than 75 % of that of the test valve.
      7.2 Materials of construction
      7.2.1 For the purposes of product compliance certification or type-testing systems, the materials of
      construction of the pressure retaining envelope of the valve shall be deemed to qualify other materials of
      construction within the generic classifications below.
      ? Ferritic
      ? Austenitic
      ? Duplex
      7.2.2 If a range of valves is covered by testing of ferritic test valves, then the type-testing coverage may be
      extended to cover austenitic or duplex materials by carrying out a further test on a mid-range size of valve of
      the same design in that material.
      7.2.3 Other materials of construction of the pressure-retaining envelope of the valve require full testing of
      representative size and pressure ratings as specified in 7.3 and 7.4. Nickel alloy valves may also be covered
      by austenitic stainless steel. Testing of low melting point alloys, e.g. aluminium bronze, shall be limited to
      valves rated PN 10, PN 16, PN 25 and PN 40, Class 150 and Class 300.
      7.2.4 Alloy steel bolting (e.g. B7, L7) used as part of the valve's pressure-retaining envelope may be used
      to qualify austenitic steel bolting but not vice-versa.

      7.2.5 Any change in non-metallic materials with respect to the seat-to-closure member seal, seat-to-body
      seal, stem seal and body joint and seal require a re-qualification. Filled PTFE, however, may qualify non-filled
      PTFE and vice-versa.
      7.3 Qualification of valves by nominal size
      The valves of other nominal sizes which may be deemed to have been fire type-tested relative to the actual
      valve tested are given in Table 2.

      Table 2 — Other valves qualified by NPS, Nominal Size and DN

      7.4 Qualification of valves by pressure rating

      The valves of other PN and Class which may be deemed to have been fire type-tested relative to the actual
      valve tested are given in Table 3.
      7.5 Special marking
      In addition to the marking required by relevant standards and regulations, valves conforming to this
      International Standard shall be marked “ISO-FT” (which stands for ISO fire-tested).

      Table 3 — Qualification of other pressure rating valves

      Bibliography

      [1] ISO 6708:—2), Pipework components — Definition and selection of DN, NPS and A

      [2] ISO 7268:—3), Pipe components — Definition and selection of PN, Class and K

      [3] ISO 10423, Petroleum and natural gas industries — Drilling and production equipment — Wellheadand christmas tree equipment

      [4] EN 736-3, Valves — Terminology — Part 3: Definition of terms

      [5] EN 1333, Flanges and their joints — Pipework components — Definition and selection of PN

      2) To be published. (Revision of ISO 6708:1995)

      3) To be published. (Revision of ISO 7268:1983)