FAQ

Required anywhere chemical risk assessments identify corrosive/toxic splash hazards. Must be reachable within 10 seconds (approx. 15-20 metres) on a single level with an unobstructed path. High-risk zones (e.g., concentrated acids) require sub-5-second access. The pathway must remain completely unobstructed, well-lit, and marked with high-visibility safety signage.

HSA regulations enforce weekly functional activations by site staff (flush sediment, test valve speed under 1 second, clear access) and an annual comprehensive EHS audit measuring full 15-minute flow and temperature stability.

Regular testing is the #1 compliance failure because staff skip it to avoid making a mess. Modern facilities use specialized mobile testing funnels and wheeled catch-tanks fitted with long sleeves that wrap around the showerhead to test full flow without spilling a drop onto the floor.

A combination unit integrates an overhead drench shower and an eye/face wash station into a single unified assembly, fed by a common water supply.

Yes. European safety standards strictly mandate that combination units maintain full required flow rates when both components are opened simultaneously:

• Minimum 60+ L/min for the overhead shower
• Minimum 6 L/min for the eye/face wash

Combination units are recommended for high-hazard areas where chemical splashes can affect the body and face at once, on sites with limited footprint space, or where plumbing line consolidation is required. Site risk assessment, safety datasheets and safety processes and standards will provide important information on the need for emergency showers. Workers should be trained on how to use emergency showers and the conditions under which they should be activated.

Flow Pattern Diameter: The water flow pattern must form a minimum 95% spray column at least 400 mm radius measured at 700 mm below the shower head.

Actuator Height: Pull rods or activation levers must be installed at a height no greater than 1750 mm from the floor.

Wall Clearance: The centre of the showerhead must sit at least 400 mm away from any wall or structural column.

To prevent mechanical trauma to the cornea, units use low-velocity laminar flow controls:

Pressure-Compensating Diffusers: Integrated diffusers break up turbulent water pressure into soft, aerated streams.

ANSI/EN Gauge Check: Streams are verified using an alignment gauge placed over the nozzles. Fluid must cover the target zone without spraying at destructive velocities.

Yes. Nozzles must feature protective caps to keep out industrial dust, airborne particulates, and chemical residue. These covers must pop off automatically the instant the water valve is activated.

Water must be delivered at a tepid temperature between 15°C and 37°C (ideal target range of 20°C to 25°C) under EN 15154. Cold water (<15°C) causes hypothermia and thermal shock, causing workers to exit early. Hot water (>37°C) accelerates chemical burn rates and scalds eyes.

If a site supplies cold mains water (<15°C) and an injured worker exits after 2 minutes due to severe thermal shock, the employer remains liable for the resulting chemical skin burns under HSA regulations. Supplying tepid water is a legally enforceable employer obligation.

Standard commercial TMVs cannot be used. You must specify an Emergency TMV certified to ASSE 1071 / EN equivalent, equipped with:

• Full-flow cold water bypass: If hot water fails, 100% cold water still flows.
• Hot water isolation: If cold water fails, hot water cuts off instantly to prevent scalding.

Instantaneous Water Heaters are an efficient way of providing tepid water to your safety shower on demand. They eliminate the need for large water storage tanks and the continuous energy demand to maintain them at higher temperatures.

Combination units (shower + eyewash running simultaneously) require a minimum dynamic operating pressure of 2.0 to 3.0 bar at the inlet and a minimum supply pipe diameter 1¼ inches (32 mm) Nominal Pipe Size (NPS) to maintain 60+ L/min (shower) + 6+ L/min (eye/face wash).

Not strictly mandated by standard plumbing codes due to environmental containment rules (preventing raw chemical wash-off from entering municipal storm drains), but dedicated holding tanks or local floor bunding are recommended to handle 1,000+ Litres of water during a 15-minute shower run.

A 15-minute shower run releases over 1,100 Litres of water. If no floor drain exists, water will flood lower floors, electrical risers, and server rooms. Solutions include recessed floor sumps, sloped bunded zones, or dry-sump suction pumps wired to the shower’s activation switch.

ANSI/EN valves must open instantly. A 76+ L/min valve opening instantly generates shockwaves that can rupture adjacent copper joints or trigger false flow alarms on nearby fire sprinkler lines. Installing water hammer arrestors upstream of the unit is best engineering practice.

When emergency showers are installed outdoors in explosive atmospheres (e.g., pharmaceutical, chemical processing, or distillery sites), all electrical components must comply with ATEX Directive 2014/34/EU.

Retrofitting non-magnetic proximity switches or inline flow switches to shower valves allows activation signals to instantly:

1. Send alert to a local alarm or building management system.

2. Drive the nearest facility CCTV camera to pan directly onto the shower zone.

3. Unlock emergency exit doors for incoming ambulance crews.

In a real chemical exposure, the victim’s natural instinct is to close their eyes and run. Safety showers need large push-handles, foot pedals, or tactile floor strips leading to the station. Eyewashes require hands-free stay-open valves so the victim can physically use both hands to hold their eyelids open during the 15-minute flush.

Trapped chemical residue in clothing causes severe secondary burns. Safety protocols mandate removing all contaminated garments while under the running shower. High-risk facilities should install privacy curtains around shower zones and store modesty gowns or disposable overalls nearby.

Begin flushing immediately with lenses in — never delay flushing to remove contacts. The force of the water plume often washes the lens out automatically. If not, the casualty (or first-aider) should remove them while continuous flushing takes place.

Flushing must continue for a minimum of 15 continuous minutes. For heavy alkaline or toxic chemical contact, continuous flushing should be maintained until emergency services arrive on site.