BS EN 1804-2:2020 pdf free.Machines for underground mines – Safety requirements for hydraulic powered roof supports.
BS EN 1804-2 This document stipulates the safety requirements for use of legs and rams as intended by the manufacturer. 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 EN 1804-3:2020) and their lfting 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 -10。C and 60 °C.This document identifies and takes account of:posible hazards which may be caused by the operation of legs, support rams and rams;一the hazardous areas and the operating conditions that can cause any type of hazard; 一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 and decommissioning; 一earthquake.A complete hydraulic powered roof support consists of the support units (EN 1804-1:2020), legs and support rams (EN 1804-2:2020) and the hydraulic and electro hydraulic controls (EN 1804-3:2020).Each part of this multipart document addresses the safety requirements of the components mentioned in the scopes of the respective parts of this multipart series.This document is not applicable to legs and rams manufactured before the date of its publication.Extension limits of legs and support rams shall withstand a pressure of at least 80 % of the maximum permissible working pressure without damage when the fully extended piston is loaded 100 times with this pressure. If the design of the hydraulic circuitry of the support unit is such that it is possible operationally to generate pressures higher than 80 % of the maximum permissible working pressure, legs and support rams shall remain undamaged at these higher pressures and under the above- mentioned conditions.BS EN 1804-2 pdf downlaod.