Document B563J0JwaQn5K0akb8jG86joJ

24--Materials Handling and Storage permanently pivoted on a flange bolt, with one end acting as a gasket and the other as a blind, can be used At the conclusion of a job on a pipeline containing corrosive chemicals, tools and per sonal protective equipment should be thor oughly washed with a reagent which will neu tralize or remove the corrosive material and then nnsed in clean water, before the equip ment is removed and the tools stored Identification of piping. Distinctive colors for identifying piping have been standardized in American National Standard A13 1, Scheme for the Identification of Piping Systems, and are described in Chapter 16, "Industrial Build ings and Plant Layout," in the section titled Use of Color, pages 385-386 Specific identification of piping should be provided by a lettered legend which names the material being piped, summarizes the haz ards involved, and gives directions for safe use Stencils or decals may be used to apply legends Legends should be made in accordance with MCA Manual L-l, listed in References, be moisture-resistant, and contain pigments that are colorfast Portable containers. Where liquid chemi cals are used in quantity, it is generally better to install pipelines and outside storage tanks than to use portable containers Spillage is then reduced and localized, so that it is easier to take necessary precautions Portable containers, such as drums, barrels, and carboys, should be correctly stoied The minimum of liquid should be kept at the point of operation, only enough for one shift is a common rule The main stock should be stored in a safe, isolated place If the liquid is corrosive or highly toxic, the storage area should be isolated from the rest of the plant by impervious walls and floor, with provision for safe disposal of spillage, or a separate building should be used Floors in the storage area for corrosive liquids should be made of cinders, concrete treated to decrease its solubility, or other resistant material Concrete is also satisfac tory for flammable liquids Good drainage will permit easy cleaning in case a container m the storage area leaks or breaks The storage area should be well ventilated, preferably by openings to the outside air equivalent to about 5 percent of the floor area Whenever it can be used, natural venti lation is preferable to mechanical, because it involves no operating problems Full drums should not be stacked, but should be placed in racks, preferably with a separate rack for each material These racks should permit easy access both for getting the drums m and out and for ready insjpection of the stock (Fig 24-lla and b) Barrels may be stacked vertically with dun nage between the tiers, but are more con veniently handled if they are kept m racks similar to those used for drums There should be equipment for moving barrels or drums in and out of racks and bracing to keep them in the racks Be sure grounding is adequate, if flammable liquids are involved See Chapter 42, "Flam mable and Combustible Liquids," for details Different materials should be stored in dif ferent designated areas, separated by wide aisles Boxed carboys should generally be stacked not higher than two tiers, never higher than three Not more than two tiers should be used for carboys of strong oxidizing agents, such as concentrated nitric acid or concen trated hydrogen peroxide Before acid carboy boxes are handled, they should be inspected for corrosion of nails or weakening of the wood by acid Before empty carboys are piled, they should be thoroughly drained and the stoppers re placed Special equipment should include a longhandled truck (Fig 24-12) which picks up the boxed carboys under the handling cleats or between the bottom cleats provided on all standard 12- and 13-gallon boxed carboys These trucks have handles long enough to keep the men handling them away from splashes, in case carbovs are dropped There is also less danger of dropping a carboy with this kind of truck than with the standard two-wheeled truck The two wheeled truck becomes a much safer device for handling drums and barrels, if it has a bed curved to fit the drum and a hook to catch the chime The safest way to empty a carboy is to move 650