Fire Test for Soft-seated Quarter-turn Valves

ANSI/API Standard 607 Fifth Edition, June 2005

Errata, November 2008

ISO 10497-5:2004 (Identical), Testing of valves— Fire type-testing requirements

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Copyright © 2005 American Petroleum Institute

API Standard 607 / ISO 10497

API Foreword

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API Standard 607 / ISO 10497

Contents

Page

API Foreword ii

Foreword iv

Introduction v

1. Scope 1

2. Normative references 1

3. Terms and definitions 1

4. Test conditions 2

   1. Direction and conditions for valves to be tested 2

   2. Pressure relief provision 2

5. Fire test method 3

   1. General warning 3

   2. Principle 3

   3. Apparatus 3

      1. General 3

      2. Specific apparatus 4

   4. Test fluid 4

   5. Test fuel 4

   6. Procedure 4

6. Performance 10

   1. General 10

   2. Through-seat leakage during burn period 10

   3. External leakage during burn and cool-down periods 10

   4. Low pressure test through-seat leakage after cool-down 10

   5. Operability 11

   6. External leakage following operational test 11

   7. Test report 11

7. Qualification of other valves by representative size, pressure rating and materials of

   construction 12

   1. General 12

   2. Materials of construction 13

   3. Qualification of valves by nominal size 13

   4. Qualification of valves by pressure rating 14

   5. Special marking 15

Bibliography 16

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API Standard 607 / ISO 10497

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 second edition cancels and replaces the first edition (ISO 10497:1992), which has been technically revised.

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API Standard 607 / ISO 10497

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 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 may 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.

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API Standard 607 / ISO 10497

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 does not cover 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) may 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.

   
   

   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

[ISO 6708:1995, 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 working pressure depends on materials, design and working temperatures, and is to be selected from the tables of pressure/temperature ratings given in the appropriate standards.

NOTE 3 Adapted from ISO 7268:1983, Clause 2.

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