Pigging Systems
Almost all filling and pumping systems can be optimised with the I.S.T. pig.
Even the most complicated pipework can be fully automated with the I.S.T. pigging system, even those in which more than 50 different substances must be transported over long distances. As a result operation is considerably more cost-effective, safe and efficient. Of course the best idea is to choose an I.S.T. pigging system right from the start when you are planning a new filling and pumping system. However, existing systems can be converted into pigging systems at any time, and consequently greatly improved. The decisive factors for retrofitting are pipework layout and the quality of the pipes' inner surface.
Which I.S.T. pigging system is the right one for you depends on the type of work you need it for. How many and what kind of products do you want to convey? What level of cleaning do you expect? What is the limit of your investment expenditure? Just a few questions which need to be answered before planning begins. Whatever the final result, it will definitely be a customised one, and the optimum solution for your needs.
Either one or more pigs may be used - in the following systems:
Open system
The pigs are loaded into the system whenever necessary and then removed. The system works on a oneway principle. Recommended for work such as loading ships or for long distance pipelines.
Closed system
The pigs remain in the system for their entire operational life and do not need to be constantly loaded and then unloaded from the pipe. After travelling through the system they are registered at the receiving station. They are then pushed back into the launching station, e.g. with air or nitrogen, they remain there until the next pumping operation. The advantage? Pigs do not need to be changed frequently - they can remain in the system for several months.
Single-pig system
The single-pig system only has one pig in the pipe which goes into action when, for example, product residue needs to be cleared out of the line. The single-pig system is the cost-effective answer for simple tasks.
Two-pig system
This is the pigging principle chosen most often. It has two pigs in a pig launching and receiving station. When the pumping process begings the first pig is pushed into the line and the product then pumped in after it. The second pig pushes the product out of the pipe, cleaning any residue from the pipe as it moves along.
Three-pig, multiple-pig and individual-pig systems are also available for special applications.
The I.S.T. modular concept
With the I.S.T. modular concept planning and installtion of your special pigging system can be fast and systematic. All stations are particularly compact and compatible, i.e. can be easily replaced or adapted to changes in conditions at a later stage.
Example: Single-pig system
