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Encyclopedia Britannica



OYQR

This article appears in Volume V24, Page 740 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: ORC-PAI
OYQR , flow
1
b dial tg~
ora c illezy with n t
twad (shall)
The London by-laws regulating drainage are very full and are
strictly enforced. They include requirements regarding the size,
Drainage form, gradient and methods of construction and repair of
by-laws. drains, together with regulations affecting the design and
fixing of traps, fittings and other apparatus connected
with sanitary arrangements. Some of the headings of the different
clauses of the by-laws are subjoined:water-closets; earth-closets;
drainage of subsoil; drainage of surface water; rain-water pipes;
materials, &c., for drains; size of drains; drain to be laid on bed of
concrete 6 in. thick; if under buildings to be encased with 6 in. of
zoncrete; drain to be benched up with concrete to half its diameter;
fall of drain; joints of drain; drain to be water-tight; thickness and
weight of iron pipes; thickness of sockets and joints of stoneware
pipes; drains under buildings; composition of concrete; every
inlet to drain to be trapped; drain beneath
wall
  to be protected by
arch, flagstone, or iron lintel; drain connected with sewer to be
trapped and means of access to trap provided; no right-angled
junctions to be formed either vertical or
horizontal
 ; at least two
untrapped openings to be provided for ventilation, each fitted with a
grating or cowl with apertures for passage of air equal in area to that
of the pipe to which it is fitted; ventilating shafts to be at least 4 in. in diameter, and if possible all bends and angles to be avoided; ventilating shafts to be of the same material, construction and weight as soil-pipes; no unnecessary inlets to drains to be made within buildings; waste-pipes from sinks and lavatories to be of lead, iron or stoneware, trapped immediately beneath the fitting; bell traps, dip traps and D traps are prohibited; waste-pipes to discharge in the open air into a properly trapped gulley; soil-pipes wherever practicable to be situate outside the building and to be of
drawn
  lead or heavy cast-iron; if fixed internally the pipes to be of lead with wiped joints; iron pipes to have socket joints not less than 22 in. in depth and to be made with molten lead or flanged joints securely bolted with some suitable insertion; the soil-pipe not to be connected with any rain-water or waste-pipe, and no trap to be placed between the soil-pipe and the drain; the soil-pipe to be circular with an internal diameter of not less than 32 in., and to be taken up above the building and its end left open as an outlet for foul air; methods of connecting a lead pipe with an iron one; connexion of stoneware and lead, connexion of iron and stoneware; ventilation of trap of water-closet with an anti-siphonage pipe of not less than 2 in. diameter and ventilated into the open air or into the soil-pipe at a point above the highest fitting on the soil-pipe; construction of slop sinks and urinals.
The by-laws respecting health and building in New
York
  City are embodied in a large number of clauses. The more detailed health regulations are found in the Sanitary Code 1903. These are by-laws framed by the Board of Health under the authority of section 1172 of the New
York
  Charter 1897. These must be taken in conjunction with the statute bearing on plumbing in New York City which wasmade by the Department of Buildings, 1896, and to which there have been several small amendments. Section 141 of the Building Code also deals with sanitation and in the Tenement House Act 1901, 1902, 1903, chap. 4, secs. 91 to 100 inclusive, deals with sanitary matters. From a general point of view the requirements of the American by-laws as to materials and methods of construction vary in a very slight degree from those in force under the London authorities. It is in the regulations affecting the execution of the work that we find a great difference, and these in New York are of a more stringent character than in any other
capital
 . Thus no sanitary, plumbing or lighting work may be undertaken without first submitting for approval to the Department of Buildings complete and suitable drawings and particulars of the materials to be used. Such a notice is necessary even in the case of repairs and alterations to existing work. As a further guarantee of the work being satisfactory it is ordained that no such work shall be executed except under the superintendence of a registered plumber. Every master plumber in the city of New York or others working therein as such must obtain a certificate of competency from the Examination Board and be registered afresh every year during the month of March, as without such certificate or licence no work can be under-taken; any person violating such requirements shall upon conviction be fined for each offence 8250 or undergo three months' imprisonment or both, while in the case of any certificated plumber or his employes wilfully breaking, with his knowledge, any of the rules and regulations relating to drainage and plumbing, the certificate of the master is to be forfeited in addition to the aforementioned fine.
II. CONVEYANCE OF SEWAGE.--For Small sewers, Circular pipes of glazed stoneware or of moulded cement are used, from 6 in. to 18 in. and even 20 in. in diameter. The pipes
are made in short lengths, and are usually jointed Pipe sewers.
by passing the end or spigot of one into the socket or
faucet of the next. Into the space between the spigot and faucet a ring of gasket or tarred hemp should be forced, and the rest of the space filled up with cement. Other methods of jointing have already been described and illustrated. The pipes are laid with the spigot ends pointing in the direction of the flow, with a uniform gradient, and, where practicable, in straight lines. In
special
  positions, as under the bed of a stream, cast-iron pipes are used for the conveyance of sewage. Where the capacity of an r8-in. circular pipe would be insufficient, built sewers are used in place of stoneware pipes. These are sometimes circular or oval, but more commonly of an egg-shaped section, the invert or lower side of the sewer being a curve of
shorter radius than the arch or upper side. The advantage of this form lies in the fact that great variations in the volume of flow must be expected, and the egg-section presents for the small or dry-weather flow a narrower channel than would be presented by a circular sewer of the same total capacity. Figs. 25 and 26 show two common forms


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