Separated-head low pressure closure
Our separated-head closure uses independent tubeside and shellside flanges, bolting and gasketing. This closure is used for moderate pressures up to 1,300 psi (92 kg/cm2), cyclic service, high temperature differences, and/or for temperatures below -20°F (-28.8°C) or greater than 650°F (343°C).
TAPER-LOK® high pressure closure
Our TAPER-LOK® closure is typically used for high pressure up to 15,000 psi (1055 kg/cm2) applications. Like our separated-head, the TAPER-LOK® closure uses separate tubeside and shellside flanges, bolting, and gasketing. The unique feature this closure offers is a reusable TAPER-LOK® ring which acts as a self-energizing seal. TAPER-LOK® is the registered trademark of Taper-Lok Corporation. Koch Heat Transfer Company has an exclusive license for TAPER-LOK® closures for use in double-pipe and multi-tube hairpin heat exchangers.
The LOK-FLANGE® closure uses common through-bolting with independent gaskets and is typically used for design pressures below 1,000 psi (70 kg/cm2). The center flange of this closure is threaded, which allows removal of the tube-end flange for inspection and cleaning of the tubes while maintaining pressure on the shellside. This closure allows the maximum number of tubes in a given shell diameter.
ZR CLOSURE™ closure
The ZR CLOSURE™ closure is the newest addition to the BROWN FINTUBE® family of closures. This closure bridges the gap between the separate-head and the LOK-FLANGE® closure by providing separate tubeside and shellside flanging and bolting, while retaining the maximum number of tubes in a given shell diameter.
Return end bonnet closure
This closure is a conservative through-bolted design. When the bonnet is removed, the U-bends of the tubes are completely exposed to permit full field inspection.
Superior closure design
Our closure designs provide an effective means of providing a removable tube bundle for a variety of design conditions and applications. All of our closures have the following features:
- External split rings - Split rings are used to lock the bundle to the shell. On outdated models these rings were internal and came into contact with the shellside fluid. Internal split-rings are still used by others.
- Through bolting - Earlier models used studded bolting that could seize or break off, and are still used by other manufacturers.
- Better gasketing - Unlike other manufacturers, our gaskets do not seat on the tubesheet face where misalignment can easily occur and the potential for erosion exists. Our shellside gaskets are easier to remove than wedge gasketing used by competitors.
- Separate tubeside and shellside gaskets - Prevent interstream leakage.
- Round flanges - More effective gasket seating than square flanges.