EN 14056-2003 pdf download.Laboratory furniture – Recommendations for design and installation.
e) where appropriate, outlets should be capable of flow control and should be resistant to accidental movement or incremental creep once set;
f) all components and materials should be compatible with the service carried out and should have external Finishes wtiich are resistant to all normal laboratory reagents. Combinations of metals which could set up an electrolytic cell in the presence of spillages should be avoided:
g) outlets through the bench should have a moisture resistant and reagent resistant seal:
h) to facilitate connection to outlets, an appropriate space should be provided between horizontal connection
points and the bench surface or panel.
11.1.2 Water
Where drip cups are provided, water outlets should be located above them with a minimum distance of 225 mm between bench top and outlets to accommodate utensils beneath.
Valves should have conventional shut off devices for normal use and should be of a specialist design where high pressures and/or fine control of water flow rate is required.
Valves and systems should be designed for working pressures up to a maximum of 6 bar.1 Special installations may require higher pressures.
11.1.3 Waste water
Water collection devices should be installed to collect drips from beneath water outlets.
Drip cups and insert sinks should be of a suitable material to cope with the liquid waste to be poured down them. If drip cups or sinks are arranged into a working surface of the bench, they may be sealed from below or above, as appropriate. A grating should be incorporated to prevent objects greater than 8 mm in diameter passing through.
Outlets from drip cups should be 38 mm nominal minimum internal diameter connections, either as traps or as direct connections.
Insert bench sinks should meet the criteria outlined above for drip cups and should have self-draining bases.
The uncontrolled flow of spilled liquids entering the water system from the laboratory drip cups or sinks should be avoided. For example. this could mean the use of lipped edges to drip cup/sink areas as well as considering the design of the waste system isolating the contaminants prior to their entry into the water system.
Trapping systems should be incorporated in each bench or bench run. It should be noted that systems incorporating catch pots should not include traps on individual outlets, as air locking will occur unless back venting or special arrangements are included.
11.1 .4.2 Gases other than fuel gases
Where fine regulation of flow rates or high purity is a requirement, specialist valves should be employed. Valves for special gases should be suitable for maximum operating pressures not exceeding 10 bar (1000 kPa) above atmospheric pressure.
Certain installations may require much higher pressures than this and should be designed specifically to meet these parameters.
Outlet valves for special gases should be designed specifically for the gas to be handled and manufacturers should ensure that lubricants, seals and materials, such as metals and plastics, are suitable for the avoidance of hazards. NOTE Examples of particular hazards are oxygen coming into contact with grease and acetylene coming into contact with copper alloys or silver alloys.
11.1.5 Electrical socket outlets
Electrical socket outlets, which include electrical power outlets at normal mains and non-standard voltages, outlets for telecommunication appliances and outlets for computer networks, should be fitted so as to minimise the risk of splashed liquids entering them. Outlets should not be fitted in soflits where plugs may become disconnected inadvertently.
Socket outlets should conform to applicable national regulations and should be either metal clad or of plastics construction, as appropriate. Computer and other communication outlets should meet the relevant international standard.
Where electrical equipment is built into laboratory furniture, the equipment enclosure or protection concept should be selected having regard to the foreseeable ingress of water, particles and corrosive substances or exposure to mechanical damage or flammable gases and vapours and the equipment should comply with any applicable national standards.
For benches designed for electrical engineering, physics (electrical) or electronics, where dangerous voltages may be exposed, the following should apply:
a) so far as is practicable, the work surface and fittings, including socket outlets, should be constructed from insulating materials. Any metalwork, other than laboratory instruments, which is within reach of the person using the bench should be covered with insulating material. This metalwork, and any which remains uninsulated, should be earthed;
b) metalwork in the vicinity of the laboratory bench should be kept to a minimum, i.e. located elsewhere, but that which cannot be removed should be earthed;
C) power sources should be in accordance with applicable national regulations;EN 14056-2003 pdf download.