API STD 622-2018 pdf download

API STD 622-2018 pdf download.Type Testing of Process Valve Packing for Fugitive Emissions.
3.12 gland flange The component used to retain the gland within the stuffing box and provide compression of the gland into the packing/stem seal to create load. The gland flange shall have two holes to receive the gland bolting. Slots for gland flange bolts shall not be used. The gland and gland flange shall be self-aligning. The gland shall have a shoulder at its outer edge so as to prevent complete entry of the gland into the packing box. 3.13 gland load The amount of load applied to a packing set. 3.14 gland flange stud A threaded rod or eye-bolt extending from a valve body against which the gland flange is tightened to compress a packing set. 3.15 leak Measurable amount of test fluid escaping from the test gland. 3.16 leak rate The quantity of test fluid passing through (or around) a seal in a given period of time. 3.17 mechanical cycle A motion of the stem simulating the movement of a valve obturator (such as disc or ball) from the fully closed position to the fully open position, and returning to the fully closed position. See also: stroke. 3.18 packing set A grouping of individual packing rings designed to fill the cavity of the valve stuffing box, with or without anti- extrusion rings. 3.19 pitting Surface cavities that occur on a metal as a result of galvanic corrosion. See also: galvanic corrosion. 3.20 rising stem valve A valve in which the movement of the stem is in an axial direction, with no rotation. 3.21 rotating stem valve A valve that will fully open or close with a nominal 90° rotation of the stem. 3.22 rising–rotating stem valve A valve in which the movement of the stem is in the axial direction and also has a 90° rotation to fully open or close. 3.23 static leak measurement Measurement of leakage taken when the stem is not moving.
3.24 stem A metal rod that connects the obturator (such as a disc or ball) of a valve to a handwheel, handle, or actuator. 3.25 stroke One half of a mechanical cycle starting from either a fully open or fully closed position. See also: mechanical cycle. 3.26 stuffing box A space into which a compression packing is inserted. Also known as a packing chamber. 3.27 stuffing box diameter The inside diameter into which packing is inserted; also called the stuffing box bore. 3.28 surface finish A measure of the roughness of a surface; typically expressed in microinches or micrometers. 4 Fugitive Emissions Test 4.1 Test Fixture 4.1.1 The test stand is constructed as a fixture designed to simulate a typical valve stuffing box. A test arrangement is shown in Figure 1. The test fixture shall orient the stem in a horizontal position and shall be constructed so as not to affect test results. The use of bushings is allowed as necessary. Test stands may be equipped with multiple test fixtures. Construction details shall be done in accordance with Annex A.
4.1.3 External Loads The actuator(s) shall not apply any transverse forces, such as side load, to the test stem. 4.1.4 Temperature Monitoring The test fixture(s) shall be equipped with thermocouples for continuously monitoring temperature during thermal cycling. 4.1.4.1 Temperature shall be monitored and recorded at the following two locations: a) the flow line of the test chamber; and b) adjacent to the stuffing box. 4.1.4.2 The thermocouple adjacent to the stuffing box shall control the test temperature. 4.1.4.3 The temperature at the flow line thermocouple shall be the reference measurement. 4.1.4.4 The fixture shall be heated using an external heat source, blanket, heating coils, or other suitable equipment. 4.2 Leak Test Equipment Selection and Calibration 4.2.1 Monitoring equipment shall be a flame ionization organic vapor analyzer with an integral data logger or a signal output for data collection. The equipment shall be certified as intrinsically safe for use with the test fluid. 4.2.2 The equipment shall meet the following performance requirements in the flame ionization mode using methane as the test fluid.