Laboratories, their planning and fittings . s 2 ins. to 3 ins. in pipes should notbe trapped. The amountof corrosion which takesplace in lead pipes —especially when vertical— is exceedingly small,and they are more com-pact and readily fittedthan sanitary pipes,which are only made inlengths of from 2 ft. to3 ft., and have wallsabout ^ in. thick, whichallowance must be doubled for the collars at each junction. Such pipesare often jointed in a mixture of Stockholm tar and fireclay, which can beobtained from chemical plant contractors. These wastes usually requiresome support by wo
Laboratories, their planning and fittings . s 2 ins. to 3 ins. in pipes should notbe trapped. The amountof corrosion which takesplace in lead pipes —especially when vertical— is exceedingly small,and they are more com-pact and readily fittedthan sanitary pipes,which are only made inlengths of from 2 ft. to3 ft., and have wallsabout ^ in. thick, whichallowance must be doubled for the collars at each junction. Such pipesare often jointed in a mixture of Stockholm tar and fireclay, which can beobtained from chemical plant contractors. These wastes usually requiresome support by wood framing or hinged iron holderbats (holdfasts) andshould end 2 ins. or 3 ins. above the channel, into which they discharge toclear the flow from other fittings. Further, a slight bend to make the open-ing face the direction of the flow is desirable to prevent local overflow, orthe vertical deposit of any solid matter (Fig. 83). This is readily arrangedwith lead pipes, Channel Drains.—Drainage channels may be made of lead or asphalt. (2) Bem^hihg Fig. 83.—Waste and Drain to Laboratory Benches. ^Diameter always refers to internal diameter unless otherwise stated. 144 LABORATORIES on a suitable foundation but are generally either of glazed ware or woodcovered with pitch. Opinions are sharply or fairly evenly divided as to thedesirability of the two last-mentioned forms. Glazed ware channels havenumerous joints, are more costly, and usually require more constructionalconsiderations but less periodical attention, while treated wood can be madein long lengths, but wants re-coating from time to time, and must thus beeverywhere accessible. Glazed channels are made in a great variety of forms,4> 5> 6, 9, and 12 ins. in diameter, in lengths up to 3 ft,, and also in appro-priate bends, junctions, and taper pieces. The usual forms are half channels(semi-circular in section), three-quarter channels, and troughs (half channelsinside and rectangular outside). Benched ch
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1921
