The following data is required in order to undertake a detailed surge analysis of a tanker loading or unloading system. The data that is relatively acceptable to assume and where Hydraulic Analysis Ltd can adopt typical values has been marked with an asterisk (*).
Hydraulic Analysis Ltd needs the information used to design a system using steady state techniques, plus additional information that is not necessarily readily available. We are familiar with the acquisition of this latter information and hence can frequently help to obtain it from our databases or from the relevant manufacturers.
Generally the following is needed:
We have a large database of isolation valve types, hence the minimum information needed is:
Air Valves / Vacuum Breakers
If any automatic air valves are incorporated on the system (usually on high points), the following is required:
Surge Relief Valves
Surge relief valves tend to need a lot of manufacturer specific data and hence we keep a large database of information. Generally only the following is needed:
Spring Loaded Relief Valves
These standard relief valves need:
Duty Flowrates and Pressures
The design duty flowrates and the pressures that are expected to occur throughout the system (this may be available from the UFDs).
Flow / Pressure Sensors
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 is required. For example:
Details of the fluid to be loaded including: