The following data is required in order to undertake a detailed surge analysis of a seawater system. The data which is relatively easy to assume has been marked with an asterisk (*).
Pumps and Pump Pipework
Recirculation Valve / Test Lines
If recirculation lines are installed on the pump pipework, the following is required:
Back Pressure Control Valves and Discharge Conditions
Details of any control valves in the system, particularly any used to main positive pressures within the system. Details of the systems discharge are also required (cooling tower, river discharge, closed circuit with pressure vessel etc).
Isolation valves may be installed throughout the system to allow isolation of any section. It is generally assumed that these valves will not be closed against pumped flow and typical valve characteristics can be assumed. If it is requested that the precise characteristics of these valves are modelled, the valve manufacturer and type details will be required.
Air Valves / Vacuum Breakers
If any automatic air valves or vacuum breakers are incorporated on the system (usually on high points), the following is required:
Duty Flowrates and Pressures
The design duty flowrates and the pressures that are expected to be used throughout the system (this may be available from the UFD’s).
Proposed Operation of the System
In order to obtain a clear understanding of the system operation and to be able to determine the worst case scenario’s, a description / clarification of the mode of operation of the system, including any automatic pump re-start or standby pump start logic, is required. For example: