DESIGN PROCEDURES FOR OBTAINING PIPE FRICTION LOSS FOR CHEMICAL PULPS

Most published design correlations for pulp suspensions flowing in pipes are based on data obtained in the regime of flow before the maximum in the curve of head loss vs. velocity. Available evidence indicates that resulting piping systems are often over-designed. For chemical pulps, the velocity limits depend on pulp properties and the condition of the pipe wall. Refining, bleaching, and drying and reslushing, all shift the maximum in the curve of head loss vs. velocity to a lower velocity than is observed with the original pulp flowing in a hydraulically smooth pipe. A roughened pipe also shifts the maximum to a lower velocity. Two methods of design are proposed for estimating friction losses at velocities in excess of the maximum in the head loss curve and within the normal range of operating velocities. A method is outlined whereby pulp and paper mills may obtain, from a small number of measurements, the design data for their own pulps and piping.

• Corporate Authors:

  Technical Association of the Pulp & Paper Industry

  One Dunwoody Park
  Atlanta, GA  United States  30338
• Authors:
  • DUFFY, G G
  • Titchener, A L
• Publication Date: 1974-5

Media Info

• Features: References;
• Pagination: p. 162-166
• Serial:
  • TAPPI
  • Volume: 57
  • Issue Number: 5
  • Publisher: Technical Association of the Pulp & Paper Industry

Subject/Index Terms

• TRT Terms: Atmospheric pressure; Chemicals; Pipe flow; Skin resistance; Slurry pipelines
• Old TRIS Terms: Chemical cargo; Pressure gradient
• Subject Areas: Design; Freight Transportation; Marine Transportation;

Filing Info

• Accession Number: 00057609
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Oct 5 1974 12:00AM