Document Mo4zGoGqXp8NGNgKL0YpRv2Rj

INDUSTRIAL BUILDINGS AND PLANT LAYOUT the floor surface where acid is spilled oc casionally. Drainage is provided so that the acid can be washed away with water. Inserts should be installed flush with the surface of the floor An insert placed on top of the floor requires a bevel on every side from which it can be approached The bevel should be long enough that a man will not tnp or lose his balance Abrasive-coated fabric strips are made for use on metal floor plates, the foot of stairs, stair nosings, and other high-hazard locations. An adhesive binds the strips firmly to the walking surface Drainage is essential where wet processes are used In some instances, floor gratings are Installed to reduce slippenness due to water and other liquids, especially along passageways The importance of selecting floor mate rials with suitable characteristics for the specific location is illustrated by plans for two new textile plants In one plant, the floor in the spinning department was con crete overlaid with maple parquet for resil ience and durability The dye house floor was acid-proof bnck For the office, as phalt tile was laid over concrete, the laboratoiy floor was rubber tile, also laid over concrete Creosoted wood block floor, which is easy on the feet and withstands trucking, was used in a large machine shop Plans for the other plant specified a floor that would be resilient, moisture-resistant, and free of vibration To get these quali ties, 3-in creosoted square timbers were imbedded in a base made of 3 in of tar concrete under 1% in of tarred sand The subfloor was %-in salt-treated pme with a layer of waterproof paper The floor sur face was 25/32-in hard maple Asphalt is used m various flooring ma terials It is dustless, plastic, odorless, and warm to the feet If the aggregate is sili ceous, the mixture is resistant to acid Ordinary grades soften in hot weaker and are not recommended for heavy industrial trucking Asphalt tile, often used in offices, may become slipped when washed or not properly wared Paving bnck, if laid on a solid founda tion like concrete, is satisfactory for heavy traffic Cement mortar joints make a smooth surface Foundry floors have been made from hard-burned bricks laid face up on a concrete base with sand-filled joints Concrete floors are used widely m ware houses and factories A wood float finish on a mixture of pea gravel, sand, and ce ment gives a roughened surface that will not crack or "dust" A smooth finish is slippery when wet Concrete does not with stand acids, and in some types of work em ployees consider concrete too hard and too cold Resilient nonslip mats with low heat conductivity can be placed over the con crete where workmen must stand in one position for considerable periods of time Cork tile is desirable for its insulation, resiliency, quietness, high nonslip rating, and ability to withstand light traffic for long periods It is not suitable for wet locations or where there are heavy loadings, and it is expensive. Cast iron plates with checkered or other wise roughened surfaces laid in cement or asphalt are suitable for some types of rough wear such as that in warehouses The slip ping hazard at the door sills of elevators may be reduced by installing steel grating filled with concrete Lead is used for floors exposed to acids and as a mat for secure footing near wood working or other machines involving seri ous danger to the operator if he slips and falls Lead is heat conductive, spark re sistant, and quiet It should not be used for heavy trucking Zinc also is used for its spark-resistant qualities, but, compared to lead, it is at tacked more readily by alkalies Floors in compounding rooms where fire and explo sion hazards exist are zinc-covered in some plants Asphalt-base, vinyl-base or lmoleum-type tile often is used in offices, laboratories, and workrooms where cleanliness and good looks are important The material is easily cleaned, noiseless, and a poor conductor of heat Magnesite is suitable for light traffic or where light oils are used It must be laid on a rigid base and should not be used where there is excessive moisture or hy drostatic pressure, as in basements A coat ing of bituminous paint is necessary to pro tect metals such as pipe from contact, since magnesite corrodes some metals Checkered steel plate wears well, but it is noisy and highly conductive of heat and electricity. It is relatively nonsbppery un less worn smooth or wet with oil 14-22