API St 607-2016 pdf free download

API St 607-2016 pdf free download.Fire Test for Quarter-turn Valves and Valves Equipped with Nonmetallic Seats.
1 Scope This standard specifies fire type-testing requirements and a fire type-test method for confirming the pressure-containing capability of quarter-turn valves and other valves with nonmetallic seating 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 standard. NOTE For the purposes of this 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. API Standard 598, Valve Inspection and Testing IEC 60584-2, Thermocouples: Tolerance Values of the Thermoelectric Voltages 3 Terms and Definitions For the purposes of this document, the following terms and definitions apply. 3.1 asymmetric seated valve Valve with an internal construction that 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 centerline. 3.2 Class An alphanumeric designation that is used for reference purposes related to valve pressure-temperature capability, taking into account valve material mechanical properties and valve dimensional characteristics. It comprises the letters Class followed by a dimensionless whole number. The number following the letters Class does not represent a measurable value and is not used for calculation purposes except where specified in this standard. 4 Test Conditions 4.1 Direction and Conditions for Valves to Be Tested 4.1.1 Symmetric seated valves intended by the manufacturer for bidirectional installation shall be tested in one direction only. 4.1.2 Asymmetric seated valves intended by the manufacturer for bidirectional 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, then 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. Grease may be removed from a gearbox prior to testing for safety purposes. 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). 4.1.6 Prior to initiating the test, inspection requirements and testing by the valve manufacturer shall have been completed on the valve in accordance with API Standard 598 or applicable production testing. 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, then 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, then any leakage shall be counted as through-seat leakage (see 5.6.1 2 and 5.6.1 4). However, the test shall be stopped if the system pressure relief device described in 5.3.2.8 activates.
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 so 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 1 50 mm (6 in.) 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 1 5 and shall be inclined so that the downstream side is fully drained. The flame source shall be at least 1 50 mm (6 in.) 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 1 50 mm (6 in.) 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 1 50 mm (6 in.).