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45--Motorized Equipment the eyes ) Wood-slat floor boards should be used and kept in good condition, to prevent slips and falls and to protect against electric shocks fiom equipment being charged Fire doors should be installed between charging rooms and other areas where flam mable liquids are handled and stored Manufactuier's recommendations os to die charging rate for batteries of various sizes should be closely followed in order to prevent rapid generation of hydrogen There are po tential explosive quantities of oxygen and hydrogen in cells of batteries This is par ticularly true if the battery is defective or if a heavy charge has been or is being applied The lower the water in the battery, the greater the cavity for the accumulation of gas Care should be taken to prevent arcing while batteries are being charged, tested, or handled Tools and loose metal should not be stored in such a position that they may fall on batteries and cause a short circuit, which in turn can cause serious bums or an explosion When manual lifting is necessary, sufficient help should be provided to prevent strains, sprains, or hernias Hand carts for transport ing batteries are commercially available or can be made m a company shop Acid carboys should be handled with special care to prevent breakage and possible injury due to splashing of acid Acid carboys should never be moved without their protecting boxes They should not be stored m ex cessively warm locations or in the direct rays of the sun Carboy biters can be used (See Chapter 24, "Materials Handling and Storage ) A summary of recommendahons for chang ing and charging storage batteries is given in Chapter 27, "Powered Industrial Tiucks," on pages 758-759 First aid for chemical bums Many bat teries contain an acid electrolyte, some, such as the nickel-iron battery, contain an alkali solution Whether it be acidic or alkaline if electrolyte gets on a person's skin, it should be washed off immediately with large quantibes of running water Neutralizing agents are so often mishandled, they often do more harm than good--only use them if first aid directions are available on labels oi thiough 1430 industrial plant direcbons Get medical aid at once First aid for burns of the eye. Wash thoroughly with large amounts of clean water A spray-type fountain should be located within 10 ft of the battery room Place a sterile dressing over the eye to immobilize the lid and get medical aid at once Well marked supplies of appropriate neutralizing agents can be kept close at hand for immediate use Check with company physician Gasoline handling Handling and storing of gasoline should comply with the provisions of the Nabonal Fire Protection Associabon Standard No 30, Flammable and Combustible Liquids Code (Fig 45-8) Gasoline should be prohibited for all clean ing Solvents with higher flash points are available and are equally effective and much safer Even when higher flash point solvents are used, if carburetor or gas line parts are cleaned, the solution should be changed reg ularly since the admixture of small quanhbes of gasoline will tend to lower the flash point, and increase the danger of fire and explosion Grease, oil, and dirt may be removed fiom metal parts by nonflammable solubons, or by high-flash point solvents m special degieasing tanks with adequate ventilahng facilities Use of gasoline to remove oil and grease from garage floors should be prohibited Nonflammable cleaning compounds are com mercially available and should be used Gasoline should not be used for removing oil and grease from hands Soaps are avail able that will effectively remove greasy dirt fiom the skin without danger of injury There are also protechve creams and ointments which, if applied before starting work, will protect the skin from dirt and grease In some shops, employees use gasoline to clean woik clothes This unsafe piactice should be prohibited If gasoline is spilled, it should be cleaned up immediately If gasoline in quantity gets into the sewage system, the fire department should be notified so that the sewers can be flushed Because gasoline vapor is heavier than air, it collects m low spots, such as base ments, elevator pits, and sumps These places