ASME HST-5-2020 pdf download
ASME HST-5-2020 pdf download.Performance Standard for Air Chain Hoists.
Refer to the following publications, copies of which may be obtained from the publisher as indicated. The edition bearing the latest date of issuance shall be used. AGMA 6010, Standard for Spur, Helical, Herringbone, and Bevel Enclosed Drives AGMA 6034, Practice for Enclosed Cylindrical Worm Gear Speed Reducers and Gear Motors Publisher: AmericanGearManufacturersAssociation(AGMA),1001 NorthFairfaxStreet,Suite500,Alexandria,VA22314 (www.agma.org) ASTM A48, Standard Specification for Gray Iron Castings (DOD adopted) ASTM A143, Standard Practice for Safeguarding Against Embrittlement ofHot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement (DOD adopted) ASTM B26, Standard Specification for Aluminum-Alloy Sand Castings (DOD adopted) ASTM B633, Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel (DOD adopted) Publisher: American SocietyforTestingand Materials (ASTM International), 100 BarrHarborDrive, P.O. BoxC700, West Conshohocken, PA 19428-2959 (www.astm.org) MIL-DTL-917, Detail Specification: Electric Power Equipment, Basic Requirements for MIL-S-901, Shock Tests, H.I. (High-Impact) Shipboard Machinery, Equipment, and Systems, Requirements for MIL-STD-167-1, Mechanical Vibrations of Shipboard Equipment (Type I — Environmental and Type II — Internally Excited) MIL-STD-740-1, Airborne Sound Measurements and Acceptance Criteria of Shipboard Equipment MIL-STD-889, Detail Specification: Dissimilar MetalsTypeD, AirChain Hoist, Geared TrolleySuspension, Air-MotorPowered. TypeD hoistsshallbeinaccordance with Table A-2.3.3-1 and the requirements specified herein. Type D hoists shall be equipped with a traversing air motor and controls for traversing the trolley. Trolley track size shall be as specified [see para. A-5.1(e)]. A-2.3.4 TypeE, AirChain Hoist, Geared TrolleySuspension, LowHeadroom, 2,000-lband 4,000-lbRated Load, Air- MotorPowered. TypeEairchainhoistsshallbeinaccordancewithTableA-2.3.4-1 andtherequirementsspecifiedherein. Hoistprojections, excludingchain basket, shall extend notgreaterthan 15 in. belowthe underside ofthe track. No partof thehoistshallextend4in. above thebottomofthetrolleytrack. Trolleytracksizeshallbeas specified[seepara. A-5.1(e)]. A-2.3.5 Air Supply Characteristics. The air supply line shall connect to the hoist. The hoist shall be capable ofoper- ating with an air supply having the following characteristics: (a) rated air gauge pressure 90 psi (b) a maximum moisture content of 0.002 lb of water per pound of dry air at 60°F and 90 psi absolute (c) solid particle contamination limited to 25 μm (d) a minimum of one drop of atomized lubrication for every 10 cfm of air A-2.3.6 Interchangeability. alsointerchangeableorreversiblewithregardtofunction,performance,andstrength.Componentpartsforthesametype of hoists from the same manufacturer shall be interchangeable to the greatest extent possible. A-2.4 Manual Operation When specified [see para. A-5.1(f)], means shall be provided for manual lowering and traversing ofthe hoist at rated The hoist shall withstand any operation specified herein without malfunction or component failure caused by faulty workmanship. Edges and surfaces exposed to operatingand maintenance personnel shall be smooth and rounded so that a hazardous surface does not exist. A-2.8 Availability, Reliability, and Maintainability The minimum acceptable inherent availability (Ai) ofthe hoist shall be 0.90. This requirement establishes threshold values for reliability, maintainability, and supportability of the hoist. A-2.8.1 Reliability. Thehoistshall operateforanaverageperiodof3,000 continuous cycles withoutfailure [this value of3,000 mean cycles between failure (MCBF) is equivalent to 90 days ofnormal ship’s operation without hoist failure]. A-2.8.2 Maintainability. Routine corrective maintenance at the organizational level shall be accomplished by re- placing complete assemblies and subassemblies. Mean time to repair (MTTR) for the hoist shall be 4 hr. At least 95% of all corrective maintenance actions shall require no more than 10 hr to complete. A-3 MECHANICAL REQUIREMENTS A-3.1 Design Stress Hoistmechanical components shall use the loadingfactors specified in para. A-3.1.1. The maximum combined stresses ofmechanical components ofthe hoist, hoisttractor, and trolleyshall notexceed 35% ofthe yield strength ofthe material used, when operatingwith rated load under10-degincline condition (see para. A-3.2). The maximum combined stress in structural and mechanical components under15-degincline condition (see para. A-3.2) shall notexceed 70% ofthe yield strength of the material used when the hoist or hoist tractor is subjected to maximum torque or braking conditions. A-3.1.1 Loading Factor. Hoist components shall incorporate the following loading factors: (a) dynamic loading based on inertial forces — 1.5 times rated load (b) static loading based on inertial forces — 2.0 times rated load A-3.2 Incline Consideration Hoisting and traversing brakes shall be provided that shall hold the rated load on an incline Hoisting and traversing brakes shall be provided that shall hold the rated load on an incline of ±15 deg with the horizontal in any direction. The hoist shall operate on a ±10-deg incline with the horizontal in any direction, with rated load, at reduced speed, through the full lift range.
