The Clark Leak Indicator
The improved Clark Leak Indicator which is illustrated herewith and which is manufactured by the H. W. Clark Company, of Mattoon, Ill., New York, Chicago and San Francisco, is valuable to water works managers as by its use thousands of dollars may be saved to a water department through locating underground leaks, by the house-to-house inspection, in which inspection a man can cover from two to four hundred services per day. A single ordinary house service (3/4 inches under the average working pressure), will carry about 18,000 gallons of water per day. Under usual conditions of service this pipe may have in it underground a very large leak, such that reduces the pressure to say four or five pounds, and representing a loss of 80 per cent, of the clearing capacity of the pipe; ordinarily a supply will be rendered to the residence under these conditions without cause for, nor receiving complaint from the consumer of lack of service. The loss of water in this single leak will amount to approximately 15,000 gallons per day, and continuing regularly, and unrepaired 5,475,000 gallons per year, which at 25 cents per thousand gallons amounts to $1,368. This represents the possible loss to the water department through one ordinary house service, and this is only the loss for one year. When the possible losses through underground service pipe leaks in a water works plant is realized, the great saving that one man can make to the water department by the use of a leak indicator in just on£ day’s work becomes apparent. Referring to the illustration herewith, it will be noted that the connections on this indicator are at the top, so that when instrument is in engagement for testing purposes, readings are readily taken. The connection is of a universal type, adapting it to instantaneous engagement with any kind of a water orifice, screw threads being provided for attachment to hydrants, sill cocks and hose bibbs, and a soft rubber insert always in place (used as a gasket on screw joint connections above indicated) provides moans for instantaneous water tight joints by compression with any kind of a bibb or orifice, round, oval or irregular shape. With this universal connection tests can be made very quickly at every place of inspection. The construction of the Clark Leak Indicator is special, as required for extremely severe service, as in such service it is subjected to severe water hammer, the sudden introduction of pressure, and the equally sudden release of same. All Clark Leak Indicators are furnished complete in a fine tan leather case as shown in illustration. The Clark Sonofone is a new instrument, for use in detecting extremely small leaks in service pipes through sound. It is used in connection with the Clark Leak Indicator. The Clark Sonofone is of the watch case type, and is very sensitive, for the reason that in its construction the detecting rod is entirely free from contact throughout its entire length, thus carrying a distinct vibratory sound from the pipe directly to the diaphragm. The Sonofone is furnished in a suitable carrying case. These two instruments are furnished also in a combination leather case, which set is known as the Clark inspector’s set No. 1.