ASME B30.1-2015 pdf download

ASME B30.1-2015 pdf download.Jacks, Industrial Rollers, Air Casters, and Hydraulic Gantries.
SECTION 1-2.0: SCOPE This Chapter applies to hydraulic jacks. SECTION 1-2.1: TYPES AND DESIGN 1-2.1.1 Types (a) Types include single-acting and double-acting hydraulic style (see Figs. 1-2.1.1-1 through 1-2.1.1-3) and are primarily used in a vertical position. (b) All jacks covered by this Chapter shall incorporate a positive stop or method to prevent overtravel, but the stop shall not alter the operating characteristics of the jack. 1-2.1.2 Design (a) The load-bearing materials in the jack shall have sufficient strength and ductility to raise, lower, and sup- port the rated load at the temperatures at which it will be used. (b) The jack shall be designed to meet the proof load requirements in para. 1-2.4.2(a). (c) The jack should be designed to ensure that the computed stress in the structural components of the jack does not exceed 50% of the yield strength of the material at the appropriate rated load for the components. (d) Control parts and accessory equipment shall be designed to provide a means of operation and adjust- ment that will minimize exposure of the operator to injury. (e) Carrying handles, if provided, shall be capable of statically supporting 200% of the weight of the jack. (f) Each double-acting hydraulic jack shall be fitted with a relief valve on the retract circuit, which allows hydraulic fluid to flow from the smaller effective area of the jack. A flow-restricting component shall not be present between the relief valve and the smaller area. (g) Changes in physical properties caused by welding handles, eyes, or other approved attachments to a hydraulic jack shall be taken into account. SECTION 1-2.2: DESIGN FACTOR The design factor for hydraulic jacks shall be deter- mined by the manufacturer. SECTION 1-2.3: RATED LOADS Rated load shall be established by the hydraulic jack manufacturer. 13 SECTION 1-2.4: PROOF TEST AND PROOF LOAD 1-2.4.1 Proof Test Requirements (a) Each newly designed hydraulic jack shall be proof tested by the manufacturer. (b) All newly manufactured hydraulic jacks shall be proof tested by the manufacturer with the jack extended to a point of at least 25% of travel for single-stage types, and sufficient travel to ensure testing of all stages for multiple-stage or threaded extension-type jacks. (c) Themanufactureroraqualifiedpersonshalldeter- mine if a proof test is required for any altered, modified, or repaired hydraulic jack. (d) After proof testing, the hydraulic jack shall be thoroughly inspected for the conditions stated in para. 1-2.8.4. 1-2.4.2 Proof Load Requirements (a) When proof loading a newly designed hydraulic jack (1) the jack’s load point shall be loaded to 110% of its lifting rated load and operated to its full length of travel through ten cycles (dynamic test). (2) the jack or cylinder’s load point shall be loaded 3 times to 150% of its rated load. The ram(s) and screw extension shall be extended to at least 90% of full travel. After this test, the jack shall be functional for full exten- sion under 100% of rated load (static test) and be free of leaks. (3) each auxiliary load point shall be proof tested in accordance with the same cycles and percentages described in paras. 1-2.4.2(a)(1) and (2). (b) The proof load for each newly manufactured hydraulic jack shall be a minimum of 100% of the rated load. (c) The proof load for each altered, modified, or repaired hydraulic jack shall be a minimum of 100% of the rated load unless otherwise determined by the manufacturer or a qualified person. SECTION 1-2.5: IDENTIFICATION 1-2.5.1 Marking Each new hydraulic jack shall have forged, cast, die- stamped, etched, or fixed-label markings by the manu- facturer to show (a) name or trademark of manufacturer