ASME B16.44:2002 pdf download

ASME B16.44:2002 pdf download.MANUALLYOPERATED METALLIC GAS VALVES FOR USEIN ABOVEGROUND PIPING SYSTEMS UP TO 5 PSI
1 SCOPE
1.1 General This Standard applies to new valve construction and covers quarter turn manually operated metallic valves in sizes NPS 4 1 ⁄ 4 and tubing sizes 1 1 ⁄ 4 O.D. These valves are intended for indoor installation as gas shutoff valves when installed in aboveground fuel gas piping down- stream of the gas meter outlet and upstream of the inlet connection to a gas appliance. The valves covered by this Standard are intended for service at temperatures between 32°F (0°C) and 125°F (52°C) at pressure ratings not to exceed 5 psi (0.34 bar). When so designated by the manufacturer, these valves may be installed for service outdoors and/or at temperatures below 32°F (0°C) and/ or above 125°F (52°C). 1.2 Applicability This Standard sets requirements, including qualifica- tion requirements, for metallic gas valves for use in gas piping systems. Details of design, materials, and testing in addition to those stated in this Standard that are necessary to meet the qualification and production test- ing requirements of this Standard remain the responsi- bility of the manufacturer. A valve used under a code jurisdiction or governmental regulation is subject to any limitation of such code regulations. 1.3 Limitations This Standard does not apply to manually operated gas valves that are an integral part of a gas appliance. Manually operated gas valves intended for use in a particular appliance are covered in the American National Standard/Canadian Gas Association Standard for Manually Operated Gas Valves for Appliances, Appliance Connector Valves, and Hose End Valves, ANSI Z21.15/CGA 9.1.1.4 Convention For the purpose of determining conformance with this Standard, the convention for fixing significant digits where limits, maximum and minimum values, are speci- fied by “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 ofmea- surement. 1.5 Quality Systems Requirements relating to the product manufacturer’s Quality System Programs are described in Nonmanda- tory Annex A. 1.6 Units The values stated in either inch units or metric units are to be regarded separately as standard. The values stated ineachsystemare notexactequivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. All pressures, unless otherwise specified, are gauge pressures.
3 MATERIALS
3.1 Materials for Valve Bodies, Plugs, Bonnets, Unions, and Other External Parts Excluding Handles Materials known to be acceptable for compliance with this Standard are listed in Table 2. Other metallic materi- als may be used when the product incorporating them meets the requirements of the Standard. 3.2 Lubricants and Sealants Lubricants and/or sealants shall be resistant to the action of fuel gases such as natural, manufactured and LP gases. The valve manufacturer is responsible for the selection of lubricants and sealants, and for the determi- nation of their suitability for service conditions enumer- ated in para. 1 of this Standard. 3.3 Seating and Stem Seal Materials 3.3.1 Elastomer Components — Air Aging. Elastomer parts that are exposed to fuel gas shall be made from materials that, following 70 hr air aging in accordance with ASTM D 573 at 212°F (100°C), meet the elongation, tensile and hardness property requirements of 3.3.1.1 and 3.3.1.2. 3.3.1.1 Tensile tests shall be conducted on six dumbbells in accordance with ASTM D 412. Three dumbbells shall be air aged 70 hr in accordance with ASTM D 573 at 212°F (100°C). The dumbbells shall have a thickness of 2.0 ± 0.2 mm (0.08 ± 0.008 in.). The average of the three individual tests for the aged dumbbells shall exceed 60% retention of ultimate elongation and 60% retention of tensile strength at break. The average of the three individual tests for the non-aged dumbbells shall be the basis for percent retention calculation.