Method for measurement of the air flow in rock drill bits

Details Method for measurement of the air flow in rock drill bits Method for measurement of the air flow in rock drill bits

1997-06-27

1999-08-10

Graysay, Tamara

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Measuring or indicating drilling fluid rate of flow

175 40, C09K 700

Patent

active

059343885

ABSTRACT:
The air flow rate through a rock drill bit is measured while the drill bit is connected to a drill string. A tube of a manometer is inserted into a channel of the drill bit while an air flow is conducted through the drill string and channel, whereby the manometer measures a pressure of the air flow in the channel. From that measurement, a nominal air flow rate is calculated. The nominal air flow rate is corrected as a function of at least one parameter selected from: a difference between a temperature of air entering the drill bit and a temperature of air ambient to the drill bit, and a height of the drill bit above sea level.

REFERENCES:
patent: 4754818 (1988-07-01), Wood

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