GENERALIZED METHOD FOR DETERMINING THE PIPE FRICTION LOSS OF FLOWING PULP SUSPENSIONS

• The purpose of this Technical Information Paper (TIP) is to provide up-to-date correlations for basic pipe friction data obtained from laboratory flow loops and pulp mill piping systems and to propose a method estimating pipe friction over a wide range of low rates.
• This method has resulted from a view of published data, design correlations, and procedures for obtaining the pipe friction loss as explained in TAPPI TIP 0410-12 “Pipe Friction Pressure Loss of Pulp Suspensions – Literature Review and Evaluation of Data and Design Methods” ( 1 ). The approximate consistency range is 2% to 6% oven dried.
• This TIP presents specific correlation equations in the “Equations and data” section for the region before the maximum in the friction loss curve and presents a method for calculating realistic but conservative values of the pipe friction component over other ranges of flow rate.

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