American Society of Civil Engineers


New Design Criteria for USBR Penstocks


by Harold G. Arthur, F.ASCE, (Assoc. Chief Engr., U.S. Bureau of Reclamation, Denver, CO) and John J. Walker, (Supervisory Mech. Engr., U.S. Bureau of Reclamation, Denver, CO)

Journal of the Power Division
, Vol. 96, No. 1, January 1970, pp. 129-143

     Purchase Information
     Permissions for Reuse  

Document type: Journal Paper
Abstract: New design criteria for nonembedded and embedded penstocks as adopted by the Bureau of Reclamation are presented. Nonembedded penstocks include supported penstocks exposed to view and penstocks encased in a protective layer of concrete in which the concrete is not considered to contribute structural strength. The embedded penstocks are circular steel liners embedded in mass concrete in which the design load is distributed between the steel shell and the embedding concrete. These criteria are applicable to bends, but are not applicable to bifurcations, trifurcations, lateral branches, or tunnel liners. Use of higher strength steels for penstock installations dictated a reappraisal of allowable design stresses to take proper advantage of the higher yield points and the ultimate tensile strengths of these steels. The criteria consider design loads based on design conditions, methods of stress analysis, quality control of steel plates, quality control of fabrication and erection, and hazard of failure in setting allowable design stresses, methods of stress analysis, and requirements for hydrostatic pressure testing and nondestructive testing of welds.


ASCE Subject Headings:
Conduits
Costs
Design
Fabrication
High-strength concrete
Hydrostatics
Inspection
Safety
Stress
Stress analysis
Yield