Transient fluid flow
In most cases of practical engineering problems, such as structural design, stress analysis, process analysis in the power, chemical, petroleum and other industries, it is necessary to know what hydraulic phenomena are involved in complex pipe network or installation. In all this cases, the stress analyst or the project engineer must be sure about nature of loads, which act in the pipe network that exists or is to be designed. For this, it is necessary to know the process nature that is involved in the structures. The nature of this processes is in the almost cases a combination of chemical and thermo-hydraulic phenomena. The hydraulic phenomena that is involved in a pipe network may have a complex nature and unexpected effect on this structure, such as vibrations, overpressure, abnormal process parameter that in almost cases do to structure collapse.
In complex pipe network can appear the following induced by flow phenomena:
water hammer (or, generally, liquid hammer)
The water (or steam) hammer is the pressure vibration in mass of liquid or or dense vapor that produces the dynamic differential pressure along pipes. The dynamic forces resulting from these differential pressures may conduce to great deformations and stresses on the pipe structure, which can collapse. This phenomena can occur when a suddenly perturbation of the pressure appear and this happened on valves closure, pump trip, pipe rupture, etc. The vapor cavitation is another unpleasant phenomenon, which occurs when the liquid pressure falls below vaporization pressure at a fixed temperature. These phenomena involve the occurrence of unstable vapor pockets in liquid mass, which influence the flow parameter and induce the violent vibrations. Also, these pockets induce a rapid local deterioration of pipe material.
PIPENET Transient from Sunrise Systems licensed by Nor-Par is state-of-art software for identifying and eliminating flow-induced transient fluid flow problems. PIPENET Transient has interface to TRIFLEX Dynamic, so transient forces can be used as occasional loads in Time History Analysis in TRIFLEX Dynamic. This way, you can first identify and decrease the unwanted effects resulting from transient fluid flow using PIPENET Transient, and then find mechanical solutions to get the piping network into Code Compliance using TRIFLEX Dynamic. PIPENET Transient allows modelling control systems for flow and pressure and analyze interactions between the control system and performance of piping network during transient fluid flow conditions.
Examples of applications:
a short brochure of PIPENET Transient applications (PDF)
Read full brochure of PIPENET Vision applications for all modules (PowerPoint)
Ownership note: PIPENET is owned by Sunrise Systems, Cambridge, UK, and it is exclusively distributed and supported by Nor-Par a.s in Scandinavia and East Europe.