Historically such analysis work was done using hand calculation methods, empirical formulae, nomogram charts as well as experience to establish the pumping frequency of the pump and then determine the natural frequency of the piping spans. Where the piping spans were found to have a low natural frequency then supports would be added, moved or deleted to achieve a suitable natural frequency for the system.
In addition to this similar techniques were used to examine the suction and discharge pressures to ensure that problems with acceleration head in the suction lines, or excessive pulsation in the discharge line do not cause problems either with the operation of the pump, or the operation of any PRV's on the line.
Today, whilst the task remains the same the advent of powerful laptop computers and user friendly software for both pressure pulsation within the pumped liquid, and mechanical analysis of structures has enabled greater detail modelling, usually in 3D, of piping structures and faster analysis.
API674 draws on this history, whilst at the same time considering the analysis techniques currently available and defines what must be examined, the way in which this may be done, and the expected minimum standards that must be achieved.