Tube insert is inserted into the end of a heat exchanger tube to provide protection to the tube mouth ends of a shell & tube type heat exchanger. The purpose of the tube insert is to either be sacrificial to the effects of inlet-end erosion, corrosion and impingement, or induce a fluid to fall on the ID of a tube in a falling film exchanger, or transfer extremely high heat past the tube sheet to the exchanger tubes.
The following problems take place in the shell & tube type heat exchangers
For the above problems, VP Engineers (VP ENGINEERS) offers its most cost-effective tube repair, shield/seal, also known as a tube insert or ferrule. Although inserts are typically only 6" - 12" long, some applications have required shield lengths up to 14 feet! Unfortunately, some exchangers suffer from full-length problems. In this case, VP ENGINEERS full length tube liners can be a very attractive alternative to a partial or full re-tubing.
Plastics: Nylon (Polyamide), LDPE and PP
Plastic inserts comes with two types of head design
Bonnet head which is used when the tube slightly projects for about 3 to 5 mm outside the tube sheet. The bonnet head encapsulates the projection in such a way that the high velocity impingement does not affect the tube mouth end & thus ensures the longevity of tube mouth end & tube.
Flared head which is used when the tube does not project outside the tube sheet. Plastic inserts are generally preferred in surface condensers of a power Plant. Nylon tube inserts can be used for up to 150°C, for some special applications even PTFE tube inserts are used for temperatures up to 250°C. Plastic tube inserts are used in different types of heat exchangers of different duties for temperatures up to 800°C.
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