ASME B16.33 pdf download

ASME B16.33 pdf download MANUALLY OPERATED METALLIC GAS VALVES FOR USE IN GAS PIPING SYSTEMS UP TO 125 PSI (SIZES NPS 1 / 2 THROUGH NPS 2)
1 SCOPE
1.1 General This Standard covers requirements for manually oper- ated metallic valves sizes NPS 1 ⁄ 2 through NPS 2, for outdoor installation as gas shut-off valves at the end of the gas service line and before the gas regulator and meter where the designated gauge pressure of the gas piping system does not exceed 125 psi (8.6 bar). The Standard applies to valves operated in a temperature environment between −20°F and 150°F (−29°C and 66°C).
1.2 Design This Standard sets forth the minimum capabilities, characteristics, and properties, which a valve at the time of manufacture must possess, in order to be considered suitable for use in gas piping systems. Details of design and manufacture (other than those stated in this Standard, including such design and production tests that will produce a valve that will have the required capabilities to meet this Standard) remain the responsibility of the manufacturer.
1.3 Standards and Specifications Standards and specifications adopted by reference in this Standard and the names and addresses of the sponsoring organizations are shown in Nonmandatory Annex A. It is not considered practical to refer to a specific edition of each of the standards and specifica- tions in the individual references. Instead the specific edition references are included in Nonmandatory Annex A. A product made in conformance with a prior edition of reference standards and in all other aspects conform- ing to this Standard will be considered to be in confor- mance even though the edition reference may be changed in a subsequent revision of this Standard.
1.4 Quality Systems Nonmandatory requirements relating to the manufac- turer’s Quality System Program are described in Non- mandatory Annex B.
1.5 Convention For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum or minimum values, are speci- fied shall be “rounding off” as defined in ASTM Practice E 29. This requires that an observed or calculated value shall be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.
1.6 Codes and Regulations A valve used under the jurisdiction of the Code of Federal Regulation (CFR) such as Title 49 Part 192, the ASME Code for Pressure Piping such as ASME B31.8, or the National Fuel Gas Code, Z223.1, is subject to any limitation of that code or regulation.
2 CONSTRUCTION
2.1 General Each valve at the time of manufacture shall be capable of meeting the requirements set forth in this Standard. The workmanship employed in the manufac- ture and assembly of each valve shall provide gas tightness, safety, and reliability of performance and freedom from injurious imperfections and defects.
2.2 Tamper-Proof Features Where valves are specified to be tamper-proof, they shall be designed and constructed to minimize the possibility of the removal of the core of the valve with other than specialized tools.
2.3 Configuration
2.3.1 Operating Indication. The valve shall be so marked or constructed that the operator can visually determine:
(a) when a 1 ⁄ 4 turn valve is in the open or closed position (if flat head, longitudinal axis of the head shall be perpendicular to the longitudinal axis of the valve when valve is in the closed position);
(b) when the valve requires more than 1 ⁄ 4 turn to operate valve, turning direction to open or close the valve.
2.3.2 Valve End. Valve ends shall comply with the following standards where applicable:
(a) ASME B1.20.1 Pipe Threads;
(b) ASME B16.1 Cast Iron Flanges and Flanged Fittings; and
(c) ASME B16.5 Steel Pipe Flanges and Flanged Fittings.
2.4 Marking
2.4.1 General. Except as may be modified herein, valves shall be marked as required in MSS SP-25 and shall include the following requirements.
2.4.1.1 Name. The manufacturer’s name or trademark and, where space permits, the designation “B16.33”. The B16.33 mark is the manufacturer’s ac- knowledgement that the valve was manufactured in conformance with ASME B16.33.
2.4.1.2 Pressure Rating. Marking for pressure ratings such as 60G, 125G, etc., may be shown on the head, stem, or body.
2.4.1.3 Tamper-Proof. The designation “T” for tamper-proof construction where tamper-proof features are not easily identifiable without disassembling the valve. This designation may be shown on the head or stem.
2.5 Lubrication (Sealant) Valves which require pressure lubrication (by the injection of lubricant through fittings to the sealing surface of the valve) shall be capable of being lubricated while subjected to the pressure rating. Compliance with this provision can be met if lubrication can be accomplished with the valve in both the fully opened and fully closed positions. The design must be such as to minimize entry of lubricant into the gasway when lubricated in accordance with the manufacturer’s instruction.