Mechanical Contracting & Plumbing January-December 1908 . over, the basin filled with clearwater from the sink and after thorough-ly stirring up the contents, the liquidcan be again allowed to run to wante. This process can be repeated indefinite-ly, until the interior of the trap is per-fectly clean. Blow-off Outets. The blow-off connections from thegrease trap may be connected direct tothe house drainage system at any con-venient point. There is no reason whysuch a connection is not permissible;after the grease once becomes congealedand is broken up into small pieces, thereis little or no da
Mechanical Contracting & Plumbing January-December 1908 . over, the basin filled with clearwater from the sink and after thorough-ly stirring up the contents, the liquidcan be again allowed to run to wante. This process can be repeated indefinite-ly, until the interior of the trap is per-fectly clean. Blow-off Outets. The blow-off connections from thegrease trap may be connected direct tothe house drainage system at any con-venient point. There is no reason whysuch a connection is not permissible;after the grease once becomes congealedand is broken up into small pieces, thereis little or no danger- of it adhering tothe walls of the pipe, but on the con-trary will be carried by the successiveflushes of water clear to the street sew-er. To discharge the contents of thetrap anywhere but in the drainage sys-tem would create a nuisance whichwould more than offset the value of theblow-off connections. In valving the blow-off outlets, thebetter practice would be to use onlyground-key cocks. If a valve were usedfor this purpose, either gate valve or. Fig. 4.—Underground trap with eastiron body. globe valve, there would be no means ofdetermining when it was completelyclosed and water might run continuous-ly through the partly opened fitting in-to the sewer. If this should occur, itis plain to be seen that the value of thegrease trap would be destroyed and thewaste pipe would become filled withgrease the same as though no greasetrap were used. (We would quite agree with what cor-respondent has to say concerning thesubject of grease traps. There is onepoint which occurs to us, however, witiwhich we believe he will agree. We thinkthat under most conditions the use ofthe grease trap outside the house, suchas shown in Fig. 2, is not as goodpractice as the use of such traps asshown in Figs. 1 and 3, for the reasonthat before entering such a trap thegreasy waste must flow through a ^*on-siderable length of cold pipe in the cel-lar and underground, which will usually^7 result in t
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