Use of the Master Meter
In these days of water conservation, with the necessity for economy in the use of fuel, one of the prime essentials is an exact knowledge of the water pumped or produced in order to check up the relative amounts consumed and wasted. It is becoming the correct practice to arrive at this knowledge by means of the so-called master meter. Another important use of the large meter is the measurement of flow through private fire connections.
There has been remarkably little written on the subject of the large or master meter when one considers the important part it plays in the economical administration of the water works department. It is of the utmost necessity for the inflow to a system to be accurately measured, whether it conies from the pumping station, from impounding reservoirs, from wells, or from some outside system, as from a neighboring city. Without accurate measurement of this nature the department must lie “at sea” as to whether or not it is pumping millions of gallons of water unnecessarily.
The type of meter to be used to measure accurately the inflow at a system must, of course, lie determined by the resources and needs of the department. The most common form for a master meter is the-Venturi with recording chart. With this device it can be told at a glance not only just what the total consumption is, hut also its variations from day to day, its peak, its low point and all other needed information which will lead to the check of waste and extravagance.
Where the Venturi is too expensive or not suited to the needs of the water works, other kinds of large meters are substituted, the proportional meter being generally used. The article by Mr. Coulter on this subject published on page 175, will be found full of important hints to superintendents along these lines, as regards the advantages and use of the master meter. We will be glad to hear from others on this subject and any experiences which superintendents have had through the use of master meters would he of service to the readers of FIRE. AND WATER ENGINEERING.