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Emergency safety showers and eye/face wash equipment must be fed from a potable water supply – drinking water or water
of a similar quality.
Minimum Supply Pressure: 29 PSI (2 Bar)
Maximum Supply Pressure: 87 PSI (6 Bar)
Where a high unregulated pressure is experienced, this must be monitored to ensure it does not exceed the recommended
maximum. If the water pressure exceeds the recommendations, please contact Hughes Safety Showers for advice.
The water supply pipe must be of a material compatible with the safety shower and/or eye/face wash equipment to avoid
corrosion.
The supply pipe should have at least the same diameter as the inlet pipe on the equipment.
If required, the supply pipe should be fitted with a non-return check valve.
Minimum flow rates must be in accordance with International standards, namely ANSI Z358.1-2014.
Water inlet size: Please refer to your general arrangement drawing for details.
Good practice:
Fit isolation valves to the supply pipes in an accessible position for use during maintenance. These valves
should have locking mechanisms to prevent unauthorised shutoff and be labelled accordingly with fixed permanent tags.
Installation of eye and eye/face washes
Water supply and supply pipe materials
Electrical supply
Where an emergency safety shower, eye or eye/face wash unit requires an electrical supply, either for heating, cooling,
alarms or lighting, then the supply should conform to the requirements as detailed in the job specific electrical drawings.
Electrical equipment fitted to these units should be supplied through a safety protection device (MCB, RCD, RCCB
for example) to provide additional protection against electric shock while also ensuring satisfactory protective bonding
arrangements are in place.
Before working on the units power must be turn off. A disconnect switch is recommended to safely interrupt power supply to
the unit. Disconnect switches are in the customer scope of supply or available as an option from Hughes.
CAUTION: Safety showers for general purpose electrical areas cannot be used in hazardous areas, as per NFPA 70
and CSA 22.2. When making electrical connections be sure to follow all lockout-tag out safety procedures.
Prior to initial operation it is advisable to remove the “Y” strainer filter basket, where fitted, along with the diffusers to ensure
they are free of any debris. Once refitted, test to verify proper operation. (see fig. 1, 2 & 3)
Once the Y strainer head is removed, using a 22mm box spanner or socket, the gauze filter can also be removed and
cleaned. (see fig. 1)
If necessary, the flow rate of the eye/facewash diffusers be adjusted via the three-pronged regulator or using the grub
screws on each side of the tee-piece in the centre of the eye/facewash bowl. A 4mm allen key will be required for this
adjustment. (See fig. 4) or via the flow regulator knob on the side of the eyewash. (See fig. 3)
Fig. 4
Fig. 2
Fig. 3
Fig. 1
