BS EN 1829-2-2008 pdf download.High-pressure water jet machines Safety requirements Part 2: Hoses, hose lines and connectors.
EN ISO 12100-1:2003, Safety of machinery – Basic concepts, general principles for design — Part 1: Basic:
terminology, methodology (ISO 12100-1:2003)
EN ISO 12100-2, Safety of machinery – Basic concepts, general principles for design — Part 2: Technical principles (ISO 12100-2:2003)
ISO 70 10:2003, Graphical symbols — Safety colours and safety signs — Safety signs used in workplaces and pubhc areas
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12100-1:2003, prEN 1829-1:2007 and the following apply.
burst pressure
static pressure that destroys the hose line and allows the liquid to escape
3.2
interconnected hose lines
several hose lines which have been connected to each other
3.3
connector safety devices
parts or components to restrain movement of the hose line if the connector fails (e.g. locking collars, hose sleeves. etc.)
4 List of significant hazards
4.1 General
This Clause contains all the significant hazards, hazardous situations and events, as far as they are dealt with in this European Standard, identified by risk assessment as significant for this type of machinery and which require action to eliminate or reduce the risk.
4.2 Hazards due to bursting or leaking of hoses
Hazards can occur when a hose bursts or leaks. The escaping stream of liquid can cause physical damage and also a sudden repositioning of the hose line in a dangerous manner (whip).
4.5 Hazards due to change in length of hose line
Hazardous situations occur when there is a sudden change of pressure in the hose line causing a change in
length resulting in the operators losing their firm hold.
5 Safety requirements and/or protective measures
5.1 General
Hoses, hose lines and their connectors shall comply with the safety requirements and/or protective measures of this Clause. In addit,on, they shall be designed according to the principles of EN ISO 12100-2 for relevant but not significant hazards, which are not dealt with by this European Standard.
Hoses, hose lines, and connectors have to feature a certain structure in order to guarantee safe operation when used property. They must not bear any nsks for the operator or for the workplace and its environment. The design of any connector safety devices has to provide safe operational performance to eliminate any risk or hazard for the operator or their environment. However, improper use of a hose line or the connectors may result in hazardous situations and must be avoided.
NOTE Correct assembly of hose lines requires specific knowledge and skills and also specific equipment.
5.2 Requirements for compatibility of components
The hoses and connectors combined to hose lines have to match each other in terms of structure, composition, and design.
NOTE Hoses of one manufacturer do not necessarily match connectors of another manufacturer.
5.3 Mechanical requirements
All components of a hose line as well as the connectors and the hose line itself shall not faN under the burst
pressure specified by the manufacturer.
5.4 Requirements concerning the maximum allowable working pressure for hose lines
For hose lines with maximum allowable working pressure up to or equal to 3 000 bar the burst pressure shall be at least 2,5 times the maximum allowable working pressure. For hose lines with maximum allowable working pressure above 3 000 bar the burst pressure shall be at least two times the maximum allowable working pressure. (See also EN ISO 7751.)
5.6 Requirements concerning change In length of hose lines
Any change in length shall not exceed +1. 2 % of the original length when subjected to the maximum allowable
working pressure.
5.7 Requirements for tensile strength of hose lines
The hose lines shall withstand a tensile force equivalent to that induced by a pressure equal to 1,5 times the maximum allowable working pressure or 1 000 N whichever is the lower value.
5.8 Requirements for loosening connectors
Measures shall be taken against the hazards of the unintentional loosening of connectors whilst the hose line is under pressure. One method is a design where the presence of pressure becomes apparent when starting loosening, for example by the use of swivel nuts with at least two axial relief bores.
If sufficient technical measures are not possible the manufacturer shall provide appropriate warnings and instructions (see Clause 7).
NOTE For maximum allowable working pressure under 500 bar, standard hydraulic connectors are considered to satisfy this requirement.
Pin nuts (swivel nuts which are fixed with a stainless steel pin) at connectors are only permissible up to 500 bar maximum allowable working pressure.
5.9 Requirements for connector safety devices
The need for connector safety devices to restrain movement of the hose line if the connector fails shall be defined on the basis of an assessment of the related risk, within the limits of the intended use of the machines for what the hose lines are Intended for.
In particular, for applications with an input to the drive for the pressure generator exceeding 40 kilowatts or a working pressure exceeding 500 bar the use of connector safety devices is mandatory for any place where significant presence of persons is foreseeable. Where technically not possible (e.g. pipe cleaning) alternative measures shall be considered and where necessary instructions shall be given in the information for use.
The fixing provisions of the connector safety devices shall be designed and constructed for withstanding the foreseeable mechanical constraints.
6 Verification of the safety requirements and/or protective measures
6.1 Tests for hose lines.BS EN 1829-2-2008 pdf download.