Modern practice in mining by Redmayne Richard Augustine Studdert Sir 1865-

Author:Redmayne, Richard Augustine Studdert, Sir, 1865-
Language: eng
Format: epub
Tags: Coal mines and mining, Mining engineering
Publisher: London : Longmans, Green
Published: 1908-03-25T05:00:00+00:00

Fig. 109.—Type of "Bailing Tank" largely used in Sinking Shafts on the Rand.

is the invention of Mr. John Swinburne of the Nantyglo and Blaina Steam Coal Collieries.^

The action is as follows:—When the kibble touches the bottom of the shaft the valve rises and the water fills the space below the piston, the air escaping

* See the Jourwd of the British Society of Mining StvdentSj vol. xxi. p. 160.

through valves in the piston. At the moment of touching the engine is reversed, moving the piston and causing it to draw up more water, so rendering the bucket an effective drainer in even shallow water. On being wound up, the engine is again reversed and the water discharged. The various parts are indicated in the sketch.

During the sinking of the deep-level (gold-mine) shafts on the Kand, " bailing tanks," as water-kibbles are there termed, are extensively used, the capacity varying from 300 to 1500 gallons, the type that has been found most convenient being illustrated in Fig. 109.^

Pulsometers. —The drainage of sinking pits is sometimes carried out by means of pulsometers; when this is the case they are usually coupled up in the manner shown in Fig. 110, or the discharge of the lower pump can be taken into the suction-pipe of the upper one (Fig. 112). The more general plan is, however, to fix the upper pump permanently, with its suction-pipe laid into a small tank supported on shaft timbers, the lower pump only being suspended by chains and lowered down as the work of sinking proceeds, and discharging into the tank.

A sinking job has been carried out with pulsometers where the quantity of water raised was from 130,000 to 140,000 gallons per hour, and where the steam was carried from boilers 350 feet away from the mouth of the shaft.

The pulsometer consists of a single casting called the body, which is composed of two chambers AA (Fig. Ill) joined side by side with tapering necks bent towards each other and surmounted by another casting

^ *' Sinking, Development, and Underground Equipment of Deep-level Shafts on the Rand," by A. E. Pettit, Trans. Inst. M.M.y February 1906.

PULSOMETERS

137

called the neck, J, accurately fitted and bolted to it, in which the two passages terminate in a common steam chamber, wherein the ball valve, L is fitted so as to be capable of oscillation between seats formed in the junction ; downwards, the chambers AA are connected with the suction passage C, EE being the inlet or suction valves, FF discharge valves (may be one or two) leading to the rising main D,B an air-chamber, HH hinged covers closing the suction and discharge chamber.*, GG guards controlling the amount of opening of the valves EE, and K is the steam-pipe.

The pump being filled with water,

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