Occasional load is the load that occurs “sometimes” in the piping system during normal operation. Occasional load can be interpreted also as a load on the piping system that occurred in the period a part of the total period piing system operation, for example 1 up to 10% of the operating period of piping system. There are several things that can cause occasional loads, namely:
- Natural phenomena such as hurricanes and earthquakes will cause excitation force against the pipe that is dynamic. Dynamic analysis on piping system is needed to get the stress distribution caused by dynamic loads which occur in piping system.
- Snow, occur in the piping system located on the earth which experience winter. Concentration buildup of snow is very thick in certain parts along the piping system will lead to the imposition of excessive weight that must be retained by the piping system.
- Postulate plant accident, an accident occurred on the piping system that arise by certain causes whether from the operator or from a third party (third party damage).
- Unusual plant operation, an error occurs in the operating conditions are made possible by negligence of the operator or procedural error in operating the piping system.