In order to keep smaller pipe lines clean, pigging are becoming more and more popular, and they are generally used on larger bores. However, it is relatively easy to reduce the size of the process designer because it is too much piggable can only be in a certain type of valve and must reconsider the new or updated piping system in the range of valves. All valve configurations cannot perform this innovative cleaning process..
What is a Piggable Valve?
Piggingis a term used to describe the process of cleaning a pipeline by a device that passes through a pipeline called a pig. In this device, this invention of the oil industry (also called pipeline intervention gadget) is a joyful sound: the flow of straw and the welding wire are made of tubes with interesting names. When the gun barrel cleaning brush performs a cleaning operation, the scraper cleans the inner circumference of the dust by passing this webpage through the central drain pipe. Media pressure generated behind a perfectly adapted piglet and pushed it into the pipeline to provide the pigsty for all the valves. Therefore, the piggable valve is a valve that allows the pig to move freely.
All the valves do not do it. Several types of valves design are not possible. For example, use of a butterfly valve that passes through the middle rod. It cannot be cleaned with pigs. When working, the outside diameter of the pig must be approximately the same as the inside diameter of the pipe, otherwise no foreign matter will come out of the pipe, which is useless. Because of its size, it cannot pass through other valves with butterfly valves or equivalent sockets. In general, it is not possible to use the narrowing through the valve (however, despite the more practical application of the large diameter, multipath pigs with appropriate equipment can be used).
One type of valve suitable for pigging is a full-bore ball valve. When the valve is open, the ball hole, since it is parallel to the inlet and outlet openings, there is no substantial difference between the bore of the valve with that of the line. In this way, the pigs can not only pass the valve unimpeded, but also clean the bore and the valve of the hose.
Starting and retrieving
All pipelines that uses pigging for cleaning, always have an entry and exist point for the pigs. The point of entry is called the lunch station, but instead of the pipe section, the receiving station, and usually the exit in many cases, it is called a pig catcher. The loading of the emitter tube and its withdrawal require removing the real part of the tube and the mold is connected between the piping and the valve, i.e. the flange. This is another important aspect of the pipeline used to plan or upgrade the pig valves, which was not affected by the removal of the valve.
Pigging always play an important role in reducing the environmental impact of batch processing. Traditionally, it may be an operator of a batch process, the only way to completely eliminate the product line is a cleaning agent, such as water or a solvent, or the line may be removed of the next product. Detergents should be treated with wastewater or solvents. If the product is used in a clean production line, the contaminated part of the product must be degraded or emptied. All these difficulties can now be removed with the very precise interface created by modern pigging systems.