畢業(yè)設(shè)計(jì)論文外文文獻(xiàn)翻譯泄壓閥的最低要求中英文對(duì)照-文庫吧資料
2025-01-23 01:35本頁面
【正文】 wing tests are successfully repeated within the 6month period before expiration. (a) Two sample production pressure relief valves of a size and capacity within the capability of an ASME accepted laboratory shall be selected by a representative from an ASME designated anization. 4 (b) Operational and capacity tests shall be conducted in the presence of a representative from an ASME designated anization at an ASME accepted laboratory. The pressure relief valve Manufacturer or Assembler shall be noticed of the time of the test and may have representatives present to witness the test. Pressure relief valves having an adjustable blow down construction shall be adjusted by the Manufacturer or Assembler following successful testing for operation but prior to ?ow testing so that the blow down does not exceed 7% of the set pressure or 3 psi (20 kPa), whichever is greater. This adjustment may be made on the ?ow test facility. (c) Should any pressure relief valve fail to relieve at or above its certi?ed capacity or should it fail to meet performance requirements of this Division, the test shall be repeated at the rate of two replacement pressure relief valves, selected in accordance with (c)(3)(a) above, for Each pressure relief valve that failed. (d) Failure of any of the replacement pressure relief valves to meet the capacity or the performance requirements of this Division shall be cause for revocation within 60 days of the authorization to use the Code Symbol on that particular type of pressure relief valve. During this period, the Manufacturer or Assembler shall demonstrate the cause of such decadency and the action taken to guard against future occurrence, and the requirements of (c) (3) above shall apply. UG136(c) (4) Use of the Code Symbol Stamp by an Assembler indicates the use of original, unnoticed parts in strict accordance with the instructions of the Manufacturer of the pressure relief valve. (a) An assembler may transfer original and unnoticed pressure relief parts produced by the Manufacturer to other Assemblers provided the following conditions are met: (1) Both Assemblers have been granted permission to apply the V or UV Code Symbol to the speci?c valve type in which the parts are to be used。 C) shall meet the requirements of UCS66, unless exempted by the following. (a) The coincident ratio de?ned in Fig. is or less. (b) The material(s) is exempted from impact testing per Fig. UCS66. UG136(b) (4) Materials used in nozzles, disks, and other parts contained within the external structure of the pressure relief valves shall be one of the following categories: (a) Listed in Section II。 and (c) The pressure relief valve is marked FOR GAS SERVICE ONLY in addition to the requirements of UG129. UG136(a) (10) for pressure relief valves of the diaphragm type, the space above the diaphragm shall be vented to prevent a buildup of pressure above the diaphragm. Pressure relief valves of the diaphragm type shall be designed so that failure or deterioration of the diaphragm material will not impair the ability of the valve to relieve at the rated capacity. UG136(b) Material Selections UG136(b) (1) Cast iron seats and disks are not permitted. UG136(b) (2) Adjacent sliding surfaces such as guides and disks or disk holders shall both be of corrosion resistant material. Springs of corrosion resistant material or having a corrosion resistant coating are required. The seats and disks of pressure relief valves shall be of suitable material to resist corrosion by the ?uid to be contained. NOTE: The degree of corrosion resistance, appropriate to the intended service, shall be a matter of agreement between the manufacturer and The purchaser. UG136(b)(3) Materials used in bodies and bons or yokes shall be listed in Section II and this and low alloy steel bodies, 3 bons, yokes and bolting (UG20) subject to inservice temperatures colder than ?20176。 C), or steam service shall have a substanti
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