The data in the following tables can be used by piping designers and the engineering community to calculate a variety of factors related to GF Harvel piping such as: working pressures, bending stresses for line expansion, weight loading, axial loads, capacity, support spacing, and other pertinent design related information. The weights shown are higher than minimum weights, as GF Harvel piping products are produced at or near the average wall thickness dimensions per applicable industry standards; not minimum wall thickness dimensions as some other products may be.
Symbols & Units
D = outside diameter of pipe, inches 
d = inside diameter of pipe, inches (Average based on mean wall) 
t = average wall thickness, inches 
A_{o} = D x pi/12 = outside pipe surface, sq. ft per ft. length 
A_{1} = d x pi/12 = inside surface, sq. ft. per ft. length 
A = (D^{2}  d^{2}) x pi/4 = crosssectional plastic area, sq.in 
A_{f} = d^{2} x pi/4 = cross sectional flow area, sq.in. 
W _{pvc} = .632 x A = weight of pipe, lb. per ft. length 
W _{cpvc} = .705 x A = weight of pipe, lb. per ft. length 
W_{w }= 0.433 A_{f = }weight of water filling, lb. Per ft. length 
r_{g} = 
√ I
A 
= 
√ D^{2 }+ d^{2}
4 
= radius of gyration, inches 

I = Ar_{g}^{2} = .0491 (D^{4}d^{4}) = moment of inertia, inches fourth 
Z = 2I/D = 0.0982 x (D^{4}D^{4})/D = section modulus, inches cube 
Wwfp = W_{pvc} (or W_{cpvc}) + W_{w} = weight of water filled pipe, lb. Per ft. length 
Capacity 
V_{G = }V x 0.004329 = Volume capacity, gallons per ft. length 
V = 0.7854 x d^{2} x12 = Volume capacity, cubic inches per ft. length 

