AS 2671:2021 – Hydraulic fluid power -General rules andsafety requirements for systems and their components (1so 4413:2010,MOD). Packaging
All parts of the hydraulic system shall be packaged for transportation in a manner that preserves their identification and protects them from damage, distortion, contamination and corrosion. Sealing and protection of openings
Exposed openings in hydraulic systems and components, in particular tubes and hoses, shall be protected during transportation either by being sealed or stored in an appropriately clean and closed container. Male threads shall be protected. Any protective device used shall be of the type that prevents reassembly until It Is removed. Handling facilIties
Transport sizes and masses shall be consistent with the handling facilities available at the purchaser’s premises (e.g. lifting tackle, passageways, ground loading): see B.1,5. If necessary, the hydraulic system shall be designed such that it can be easily disassembled into subassemblies.
5.4 SpecIfic requirements for components and controls
5.4.1 Pumps and motors MountIng
Hydraulic pumps and motors shall be mounted or installed so that
a) they are accessible for maintenance:
b) no shaft misalignment is introduced as a result of the duty cycle, temperature variations or applied weight loadings;
c) induced axial and radial loads are within rated limits for the pumps and motors and any drive components used;
d) all fluid connections are correctly connected; all pump shafts rotate in the correct direction as marked and intended; all pumps deliver fluid from Inlet to discharge; arid all motor shafts rotate In the correct direction relative to the direction of fluid flow;
e vibration Is adequately damped. Couplings and mountings Drive couplings and niountings shall be capable olcontinuously withstanding the maximum torque that can be generated at the pump or motor under all conditions of intended use. Drive couplings shall be provided with a suitable protective guard when the coupling area can be accessible during operation of the pump or motor. Rotational speed
Rotational speed shall not exceed the specified limits. Drains, air bleeds and auxiliary ports
Drains, air bleeds and similar auxiliary ports shall be installed so that they do not allow ingress of air into the system. They shall be designed and installed such that back pressure does not exceed the pump or motor manufacturer’s recommendations. If hlgh.pressure aIr bleeds are used, they shall be installed so as to minimize the hazard to persons. Pre-fllling of housings
Where the housings of hydraulic pumps and motors require pre-filling with fluid prior to start up, a readily accessible and marked means for pre-filling shall be provided and be located to ensure that air is not trapped in the housings. Working pressure range
If there are any restrictions on the working pressure range at which the pump or motor may be used, these shall be defined In the technical data; see Clause 7. Installation
Hydraulic pumps and motors shall be installed so that
a) through the arrangement and selection of piping connections external leakage is prevented; tapered pipe threads or connection mechanisms that require sealing compounds shall not be used;
b) loss of prime or case lubrication is prevented during periods of inactivity;
C) pressure at the pump Inlet port Is not less than the minimum specified by the pump supplier for the operating conditions and the system fluid used;
d) they are either protected from predictable external damage, or suitably guarded if a hazard results,
5.4.2 Cylinders Resistance to buckling
Attention shall be given to stroke length, loading and cylinder mountings in order to avoid bending or buckling of the cylinder piston rod a any position; see ISO/TS 13725. DImensioning
The design of cylinders shall take account of the maximum loads and pressure peaks that are expected. Mounting ratings
All load ratings shall take account of the mounting types.
NOTE Cylinder rated pressures reflect only the capability of the pressure-containing envelope and not the force transmitting capability at mounting conhigurations. Loading by position stop
When a cylinder is used as a position stop, the cylinder shall he sized and the mounting selected on the basis of the maximum loading induced by the machine member restrained. Resistance to shock and vibration
Any attachment mounted on or connected to a cylinder shall be assembled in such a way that resists loosening caused by shock, vibration, etc., while In use.
54.2.6 UnIntended pressure lntensllicatlons
Means shall be provided in the system for preventing unintended pressure intensifications caused by differences in effective cylinder areas from exceeding rated pressure limits.