Air Consumption

The table below shows the required amount of air, in cubic feet per minute (CFM) for the Bulroc range of Hyper hammers to maintain the specific operating pressures, in pounds per square inches (PSI). These figures assume that where applicable a solid choke is installed in the hammer.

All figures in cubic feet per minute (CFM)
Hammer Type	100psi	150psi	200psi	250psi	300psi
Hyper 31	52	96	148	206	271
Hyper 41	82	151	232	325	427
Hyper 51	103	188	290	406	534
Hyper 61	179	329	506	708	930
Hyper 81	261	479	738	1031	1355
Hyper 121	591	1087	1673	2339
Hyper 181	1098	2017	3105
Hyper 241	2188	4021

When extra flushing air is required the choke can be drilled to create a flow of live air through the hammer. The size of the flushing hole will determine how much extra air is required by the hammer to maintain the specific operating pressures. The table below shows the amount of air that will pass through different sizes of flushing holes. These figures must be added to the figure in the above table to give a total required CFM.

All figures in cubic feet per minute (CFM)
Hole Size	100psi	150psi	200psi	250psi
6 mm	68	98	128	157
10 mm	82	151	232	325
13 mm	103	188	290	406
16 mm	179	329	506	708
19 mm	261	479	738	1031

Example- The table below shows the required CFM for the Hyper 121 with the various chokes fitted

All figures in cubic feet per minute (CFM)
Hole Size	100psi	150psi	200psi	250psi
Solid Choke	591	1087	1673	2338
6mm Choke	660	1185	1801	2495
10mm Choke	743	1307	1960	2690
13mm Choke	861	1477	2183	2965
16mm Choke	1013	1680	2469	3318
19mm Choke	1198	1942	2820	3748