API 599:2002 pdf download

API 599:2002 pdf download.Metal Plug Valves-Flanged,Threaded and Welding Ends.
2.2.2 Face-to-face dimensions for raised-face and ring-joint flanged-end valves and end-to-end dimensions for butt-welding-end valves shall conform to ASME B 16.10 or Table 3 as applicable.
2.2.3 End flanges of steel valves shall be integrally cast or forged with the body: however, flanges may be attached by full-penetration butt welding if this method is specified in the purchase ordcr. End flanges attached by welding shall be cast or forged butt-welding cnds. Welds shall conform to ASME B31.3, as shall qualifications for the welding procedure and the welder or welding operator. The finished weld thickness shall not be less than the minimum body-wall thickness (see 2.2.1). No welding or brazing shall be permitted on ductile iron.
2.2.4 The dimensions and finish of steel end flanges shall be as specified in ASME B 16.5 for the type of facing specified in the purchase order. Flat-face flanges not covered by a lining material shall be finished as specified in ASME B 16.5 for raised-face flanges.
2.2.5 The dimensions and finish of ductile iron-end flanges shall be as specified in ASME B 16.42 for the type of facing specified in the purchase order.
2.2.6 Socket-welding end preparation shall conform to
ASME B 16.11. The bottom of the socket shall be square and
flat with the thickness in accordance with Table 4 of ASME
B 16.34.
2.2.7 Steel butt-welding ends shall conform to ASME B 16.25 for the bore specified, for use without backing rings.
2.2.8 Threaded end valves shall be threaded as specified in ASME B 1.20.1. All internal threads shall be countersunk a distance of approximately one half the pitch of the thread at an angle of approximately 45 degrees with the axis of the thread.
2.2.9 When specified, drain and bypass connections shall conform to ASME B 16.34 and MSS SP-45. as applicable.
2.3 COVER
Covers shall have bearing surfaces for bolting that are parallel to the cover face within I degree. When spot-facing or back-facing of flanges is required, it shall be in accordance with the requirements of ASME B 16.5 for end flanges.
2.4 PLUG STEM
2.4.1 The stem shall be designed so that, if failure of the stem to plug or that part of the stern within the pressure boundary occurs, no portion of the stem can he ejected from the valve as a result of internal pressure. The design shall not rely on actuation components (e.g., gear operators. actuators, levers, etc.) to prevent ejection.
2.4.2 Stein-to-plug connection and all parts of the stem within the pressure boundary, shall under torsional load exceed the strength of the stem that lies outside the pressure boundary by more than 10%. This determination may he done by calculation.
2.4.3 The stem and connection between stem and plug shall he designed to resist permanent deformation or failure of any part when a force applied to handle or gear operator produces a torque equal to the greater of 15 ft-lbs or two times the manufacturer’s maximum published torque at maximum differential pressure on dry air service.
2.5 GLANDS
Adjustable glands may be a threaded type, a bolted one- piece type, or a bolted two-piece, self-aligning type.
2.6 BOLTING
2.6.1 Covers shall he bolted with studs, stud bolts, or cap screws. Studs and stud bolts shall be equipped with heavy. semifinished hexagon nuts that conform to ASME B 18.2.2.
Bolting shall be threaded in accordance with ASME B 1.1. Bolting 1 inch or smaller shall have coarse (UNC) threads:
bolting larger than 1 inch shall he of the 8-thread series (8 UN). Bolt threads shall be Class 2A, and nut threads shall he Class 2B. When wrench-fit studs are furnished, the wrench-fit end of these studs and the threaded hole shall have threads in accordance with a Class 5 interference fit, as specified in
ASME BI.12.
2.6.2 Gland bolting shall pass through holes in the gland. The use of open slots is not permitted in the cover flange, cover, adjuster, or gland.
2.6.3 Packing gland bolts to be designed to not exceed the tensile stress values listed in Table A-2 of ASME B3l.3 with a packing compressive stress of 5,500 psi and gland bolt temperature of 100°F.
2.7 OPERATION
2.7.1 Plug valves shall be designed for operation by applying a wrench (sometimes called a lever) or a handwheel to the stem either directly, or indirectly through the use of a gear mechanism or another mechanical device. The purchaser shall specify the type of operation required. Tables 2A and 2B show the standard method of operation for each valve class, pattern, and size. The length of the wrench or the gear ratio of the gear mechanism shall he designed such that the input force required to operate the valve does not exceed the operator input force capability values given in MSS SP-9l using short-term force, a combined multiplier of 0.4 at the manufacturer’s maximum operating torque as defined in 2.4.3.