AHL FKVaCbDy2

and F = correction factor = F1 • F2 • F3 • F4 • F5

F1 = correction factor for pulp temperature. Since the pulp temperature is 95°F

F2 = correction factor for pipe roughness. For stainless steel pipe,

F3 = correction factor for pulp type. Numerical coefficients for this pulp are contained in Appendix C, Table II, and have already incorporated this factor.

F4 = correction factor for beating. No additional beating has taken place, therefore

F5 = design safety factor. This has been assumed to be unity.

K = numerical coefficient = 5.30 (from Appendix C, Table II) s, b,y = exponents = 0.36, 2.14, and —1.04, respectively (from Appendix C, Table II)

V, C, D have been evaluated previously.

AH/L = (1.25 )(5.30)(6.41036)(4.5214)(7.981 —104) = (1.25 )(5.30)( 1.952 )(25.0)(0.1153) = 37.28 ft head loss/100 ft of pipe

This is a rather substantial head loss, but may be acceptable for short piping runs. In a large system, the economics of initial piping costs versus power costs should be weighed, however, before using piping which gives a friction loss of this magnitude.

example 2 Determine the friction loss (per 100 ft of pipe) of 2500 U.S. GPM of 3% oven-dried bleached kraft pine, dried and reslurried, in 12 in schedule 10 stainless steel pipe (pipe inside diameter = 12.39 in). Stock temperature is 1250°F.

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Survival Treasure

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