Determination of critical length for pipe whip design

Conference · Wed Nov 01 04:00:00 EST 1995

OSTI ID:124720

Ly, B L; How, G P.H. ^[1]

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1. AECL-CANDU, Mississauga, Ontario (Canada)

Design of pipe whip restraints requires a knowledge of the maximum allowable unsupported pipe length. This paper presents a numerical method for calculating this critical length of the pipe. Salient features of the method are: (1) as a flow rounds an elbow, it exerts a transverse kick and an axial thrust to the pipe, both the axial thrust and the bending moment are considered; (2) the jet force is applied in an abrupt manner, the dynamic amplification factor (DAF) is determined from the load-deflection (H-{Delta}) curve of the pipe, by taking into consideration large strain, large deformation and the nonlinear stress-strain relationship of the piping material; (3) the ultimate capacity of the pipe under the combined action of an axial force and a bending moment is governed by an interaction formula. The maximum unsupported pipe length is calculated from this formula. Only the formulas and derivation are presented. Numerical results and design curves will be given in the future.

• OSTI ID: 124720
• Report Number(s): CONF-950740--; ISBN 0-7918-1332-0
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
42 ENGINEERING
CALCULATION METHODS
CONTAINMENT SYSTEMS
DESIGN
EQUIPMENT PROTECTION DEVICES
FLUID-STRUCTURE INTERACTIONS
MATHEMATICAL MODELS
MITIGATION
NUCLEAR POWER PLANTS
PIPE JOINTS
PIPE WHIP
PIPELINES
PIPES
RESTRAINTS
RUPTURES