ESDU 89030:2011

ESDU 89030 introduces a Fortran program, ESDUpac A8930, that
predicts, following pump trip and/or valve operation, the changing
values at a junction of liquid pressure and flow velocity,
structural displacement, velocity and acceleration, and piping
forces in a liquid-filled planar system. The effect of the mutual
coupling of the fluid and pipe behaviour is included in the
analysis (or, if desired, can be neglected). Guidance is included
on modelling the pump characteristics and the valve closure/time
behaviour. Values of friction factor and wave speed are required
for each pipe, or can be computed by the program. Data on the
natural vibration characteristics of the system are also necessary,
and can be generated by ESDU 88022, in which case they will be in
the format required by the program. The effects of axial strain in
the pipe walls are neglected, and the program assumes elastic
structural behaviour and a homogeneous fluid. Thus, although gas
release and cavitation are predicted, their subsequent effect on
the system behaviour cannot be modelled. Steady-state values of
pressure, flow velocity, structural displacement and piping forces
are calculated before the transient analysis. A detailed
explanation of the input data and their format is given, together
with a worked example illustrating the use of the program and the
presentation of the output. Graphs produced from the program show a
comparison between a coupled and uncoupled calculation of the
structural parameters and fluid pressure at two points in the
system. The program is also provided in ESDUview.

This document does not provide a preview.