This document stipulates the safety requirements for use of legs and rams as intended by the manufacturer or the manufacturer's authorized representative. These include legs@ support rams and rams@ including the mechanical extensions@ the inner valves and safety devices@ seals@ the hydraulic connections@ (up to the 1st hose line or to the valve of design B@ see Part 3) and their lifting points but excluding protective pipes and gaiters@ external valves and hydraulic and electrohydraulic control systems. NOTE Some components are discussed in other parts of this standard series. This document applies for legs@ support rams@ and cylinders that are used at ambient temperatures between ?C10 ??and 60 ?? This document identifies and takes account of: ?? possible hazards which may be caused by the operation of legs@ support rams and rams; ?? the hazardous areas and the operating conditions that can cause any type of hazard; ?? the situations that can result in hazards that cause an injury or impair health; ?? dangers that can be caused through mine gas and/or flammable dusts. This document describes methods for reducing these hazards. Clause 4 contains a list of the hazards discussed. This document does not specify any additional requirements for: ?? specially corrosive environments; ?? risks associated with manufacturing@ transport@ and decommissioning; ?? earthquake. This standard is applicable to all legs@ support rams and rams placed on the market for the first time and which are manufactured after the date on which this standard was published.
PREN 1804-2-2019 history
2019PREN 1804-2-2019 Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 2: Power set legs and rams