Thank you for using the Bentonite Calculator app, for support please email: nicoll55.ian@gmail.com
Instructions:
Machine OD (overcut): Enter outside diameter of cutting head (including gauge cutter).
Pipe OD: Outside diameter of jacking pipe.
Pipe Length: Length of your jacking pipe.
Drive Length: Length of the tunnel.
Volume Muck-up Factor: (Recommended HK AG 2.5): If you enter 1.0, it will return the exact annulus gap volume, however, due to bentonite lubrication loss into the ground or leaks etc, it is recommended from Herrenknecht AG you set a 2.5 multiplier here to allow for any losses.
Jacking speed: Average speed you are advancing the machine.
Weight of 1 beno bag: Weight of a single bentonite bag.
No. of beno bags in mix: Example: if your bentonite mixer holds 8 cubic meters and you are adding 16 bags of bentonite in the mix, you would enter 2 as you using 2 bags per cubic meter (16 / 8 = 2).
Beno qty. for slurry tanks: If you are using a bentonite slurry, enter here the estimated tons of bentonite you will use just for mixing the slurry tanks for the whole drive.
No. of beno bags / pallet: The number of bentonite bags there are on a new pallet of bentonite.