BS 8627 pdf free download
BS 8627-2019 pdf free download.Fire and rescue service equipment – Ultra-high pressure firefighting equipment – Specification.
4.2 Safety requirements
4.2.1 General
The system shall automatically switch off when communication between the lance and the control panel is lost.
The system shall allow isolation of the activation mechanism at the lance to ensure unintentional operation of the activation mechanism during transit or movement does not result in an emission of a high-pressure jet of water from the nozzle.
4.2.2 Safety devices against back flow
The system shall have a safety device preventing the back flow to the ultra-high pressure water source.
The system shall be designed to ensure that the safety device cannot be switched off or made inoperative.
4.2.3 Safety devices against exceeding maximum allowable working pressure
The system shall have a safety device preventing the maximum allowable working pressure being exceeded by more than 10%.
The system shall be designed to ensure that the safety device cannot be switched off or made inoperative.
4.2.4 Safety devices against system blockage
The system shall have a manually-operated device which releases the pressure in the system in the event of a blockage.
The system shall be designed in such a way to ensure that the safety device cannot be switched off or made inoperative.
The manually operated device shall be clearly labelled.
NOTE Attention is drawn to the Machinery Directive [1] with regard to labelling.
4.2.5 Pressure indicator
The system shall have a pressure indicator directly displaying the actual operating pressure of the liquid at the outlet of the ultra-high pressure water source in bar. The display shall be readily visible to the operator and the maximum allowable working pressure shall be marked.
4.2.6 Emergency stop
The UHPFE shall be equipped with emergency stop devices relevant to specific hazards, based on the risk assessment to be carried out by the manufacturer. The operation of the emergency stop shall conform to BS EN 60204-1.
The emergency stop shall safely stop the flow of water, reduce the pressure in the system to 0 bar and isolate electrical power to the system.
NOTE Attention is drawn to the Machinery Directive [1] with regard to emergency stop procedures.
4.2.7 Drain valve
Drain openings shall be in accordance with the safety distance requirements in BS EN ISO 13857.
4.3 Mechanical requirements
4.3.1 Common requirements
All parts of the ultra-high pressure retaining components shall be designed to withstand the maximum allowable working pressure specified by the manufacturer. The test pressure shall be related by a factor to the maximum allowable working pressure given in the manufacturer’s specification. In no case shall this factor be less than 1.3 times the maximum allowable working pressure (see also 5.2).
All parts of the system shall be designed to be easily operated by trained personnel wearing suitable and appropriate PPE for the task they are carrying out (e.g a workshop technician or a firefighter at an incident).
4.3.2 Lance
The lance shall be able to withstand the impact and shock stress which can be expected during normal operation without any leakage or limitation of the intended function.
The activation of ultra-high pressure water and abrasive shall be separate.
The activation mechanisms shall be protected and isolated against unintended activation (e.g. by a guard).
When the activation mechanism is released the pressure shall dissipate in a controlled and safe manner.
The release of the activation mechanism shall not be impaired or made inoperable by the recoil effect.
The holding force to be exerted manually on the activation mechanism of the lance shall not exceed 60 N for the whole hand.
The activation mechanism shall be able to be isolated in the OFF position.
NOTE This can be achieved, eg. by a knob, hand lever or switch.
It shall not be possible for the activation mechanism to be locked in the ON position.
The recoil forces shall not exceed 250 N in the flow path direction. The recoil forces shall not be released within a period of 1 s to allow time for the operator to react.BS 8627 pdf download.
