Emergency Washing Equipment Eyewashes and Emergency Showers

Topics Covered n Chemical eye and skin hazards n Personal protective equipment n Emergency washing standard Eyewashes Emergency showers Drench hoses

The first 10 to 15 seconds after exposure to a hazardous chemical, especially a corrosive chemical, are critical. Delaying treatment, even for a few seconds, may cause serious injury. Emergency showers and eyewash stations provide on-the-spot decontamination. They allow workers to flush away hazardous chemicals that can cause injury. Emergency showers can also be used effectively in extinguishing clothing fires or for flushing contaminants off clothing. Why are eyewash or emergency showers needed? Eye damaged by corrosive liquid

Corrosives - that destroy tissue include acids and caustics includes chemicals with pH less than 2.5 or more than 11 Strong Irritants - that cause an inflammatory effect at point of contact Toxic Chemicals - that are absorbed through the skin and cause ill health effects includes pesticides The following types of chemicals require emergency washing equipment:

Chemical plants Typical areas where emergency washing equipment is needed Laboratories Chemical loading stations Chemical mixing areas Pesticide mixing & loading stations caustic

Typical chemicals needing emergency washing equipment Bleach Formaldehyde All acids Sodium hydroxide Anhydrous ammonia (gas) Aqueous ammonia Chlorine gas Industrial cleaning chemicals Boiler chemicals Many solvents Many pesticides For other chemicals, check material safety data sheets for chemical properties and eyewash recommendations

Ways to Control Chemical Hazards n Elimination – cease using the chemical n Substitution – use a less toxic or less corrosive chemical n Dilution – use a less concentrated form of corrosive chemicals n Engineering Controls – reduce or eliminate worker access to the chemical n PPE – gloves, eye protection, aprons etc. However, first aid and emergency washing facilities are still needed when splashes, spills or releases occur.

Engineering Control Examples n Closed Containers n Closed Systems n Container Splash Guards n Container Pumps – eliminates hand pouring Example of a pesticide closed mixing system

Chemically Resistant Gloves Neoprene Butyl PVC Nitrile Latex - only for corrosives The type of glove required depends on the kind of chemical. The following are recommended for most chemicals: Link to chemical glove selection guide Link to chemical glove selection guide Note: this link refers to farm chemicals, but applies to all chemicals

Goggles and Face Shields Goggles are required when handling corrosive liquids Face shields are recommended for highly corrosive chemicals

Protective Clothing Includes aprons, coveralls, whole-body suits Required if there is a risk of splashes to the body from highly corrosive or toxic chemicals. Whole-body protective clothing is typically required at chemical plants or hazardous waste sites. Link to PPE Guideline

Can PPE be used in lieu of emergency washing facilities or vice versa? No!!! Both are needed. PPE can prevent injury, but is not failsafe. Emergency washing facilities are used to treat or minimize injury when PPE fails or employees fail to use it.

Real-life examples of failed PPE Gloves found at plating shop where acids, caustics, and cyanide solutions were used were found to have pinholes. Poor housekeeping and improper glove care resulting in chemical getting inside gloves.

General Requirements Where emergency washing facilities are needed, they must be readily available and accessible as follows:  Free from obstructions or obstacles  Can be reached in 10 seconds or less  Function properly Note: The travel distance to the eyewash or shower should be no more than 50 ft.

Obstructed Eyewash Example Photo is an actual eyewash located at commercial laundry. Employees handled concentrated bleach and caustic detergents. Consider this scenario: a worker with bleach in eyes, bumping into barrels, leaning over obstructions and bumping head on ledge, then finding that this eyewash was not hooked up to water!

Emergency Eyewashes  Required where there is the potential for an employee’s eyes to be exposed to corrosives, strong irritants, or toxic chemicals.  Eyewash must irrigate and flush both eyes simultaneously and allow the user to hold the eyes open with both hands.  On-off valve must be activated in one second and remain open.  Must deliver at least 0.4 gallons per minute for 15 minutes.

Improper Eyewash Examples Inadequate eyewash for plating shop using large volumes of acids and caustics. Nozzle was modified into a jet of water which would be painful at best. Does not meet ANSI standards

Approved Portable Eyewash Portable eyewashes can be used where there is no plumbing. Must meet same standards as plumbed eyewash. Must contain at least 6 gallons of water. Make sure they meet ANSI standards.

Low Flow Eyewash – not approved One gallon reservoir is not sufficient as primary eyewash. This unit also has insufficient flow rate. Can be used as an auxiliary eyewash only.

Personal Eyewash Equipment n Often called “eyewash bottles” n Must use potable water or other medically approved eye flushing solution. n Cannot be used in place of required shower or eyewash.

Faucet-mounted Eyewashes Most faucet-mounted eye washes are intended to be supplemental equipment. Some units do not meet the provisions of ANSI Z358.1 for eyewash since it takes two steps to activate them as illustrated. Some manufacturers have recently offered faucet-mounted eyewashes that meet ANSI standards. These units should only be used only with cool or warm water to prevent scalding. 1. Turn on water 2. Pull knob

Emergency Showers Required if there is a potential for substantial portions of the body to come into contact with corrosives, strong irritants, or toxic chemicals. Must provide 20 gallons per minute for at least 15 minutes. A bathroom shower does not meet these water flow requirements.

Hand-held Drench Hoses n Hand-held, single-headed device attached to flexible hose. n May not be used as a substitute for required eyewash or emergency showers. n Must provide 3 gallons per minute for 15 minutes. n Are useful for small spills on extremities.

Appropriate Water Temperature Water temperature should be moderated to prevent additional harm from scalding or hypothermia. Most people cannot tolerate flushing their eyes with ice-cold water for 15 minutes. Any temperature compatible with extended flushing is O.K.

Using Emergency Washing Equipment Emergency washing equipment is rarely used since emergencies by definition are rare events. On the rare occasion it is needed, a worker’s eyesight can be saved. The employee with corrosive liquid splashed in the eye will often need help in finding the eyewash and in keeping his eyes open for 15 minutes. A short training for all at-risk workers should be done – where equipment is located and how to use it.

Equipment inspection n Plumbed eyewashes and drench hoses must be activated weekly and inspected annually. n Emergency showers must be activated and inspected annually. n Portable equipment must be inspected and maintained according to manufacturer’s instructions.  Sealed portable units must be replaced after expiration date. Checking an emergency shower

Potable water n “Potable” means meeting drinking water standards n Some workplace or well water is not fit for drinking n Emergency washing facilities not using potable water must have signs stating that the water is non-potable