Engineering Formulas Listed alphabetically A through J.
A. Formulas for determining conveyor speed, capacity, and material weight per
foot of conveyor.
1. M=33.3 x TPH 2. M=CFM x
q 3. S=N h x p x
RPM
S
S
12
B. Formula for determining chain length required:
1. L=24 x C + N(N t = N h = N)
p
Note: This equation assumes sprockets of equal size and chain pulled taut.
Additional pitches are required for catenary take-up, see Equation C-1. For
straight sidebar chains, chain length must be an even number of pitches.
C. Formulas for determining sag, excess chain and catenary tension:
1. Z²=4.5 x U c x E
2.
P c = 1.5 x W x U² c
Z
D. Formula for determining chain pull from skirt board friction:
1. J=U a x h² x f h
E. Formulas for determining chain pull from digging in boot:
1. Q = M x D t x f d
continuous disch.
elev. --f d = 0.5
Centrifugal
disch. elev. --f d = 0.67 (fine mat'l)
1.0
(coarse mat'l)
F. Formulas for determining horsepower:
1. HP = t x RPM 2. HP = T x RPM 3. HP = P x S 63,025 5252 33,000
G. Formulas for determining torque on driving shaft:
1. t = P x D h 2.
T = P x D h = t
2
24
12
H. Formula for determining sprocket pitch diameter:
1. D h = p
D t =
p
Sin
(180/N h)
Sin(180/N
t)
I. Formula for determining conveyor component weight per foot of conveyor:
1. W = n x w + v
x
J. Formula for determining height of material sliding against skirt boards:
1. h = 12 x M
q x g