Tag Archives: klinger

Improving Heat Transfer in Shell-and-Tube Heat Exchangers

Shell-and-tube heat exchangers with removable tube bundles require that manufacturing clearances are present to facilitate the insertion and removal of the tube bundles for maintenance, repair or cleaning purposes.

For heat exchangers designed for multipass flows within the shell — for example, Tubular Exchanger Manufacturers Association  standard shell types F, G and H — it is common to incorporate a longitudinal baffle plate within the tube bundle design. These plates direct the shell fluid flow in desired directions to increase the
dwell time of the fluid while in contact with the tubes, thereby  increasing the heat transfer effectiveness of the exchanger.

Due to the manufactured component clearances, repair operations, and possible wear and tear, there is often a substantial gap between the edge of the baffle plate and the inside diameter of the shell. This gap creates a natural path for the shell fluid flow to deviate from the intended flow direction, effectively shortening the dwell time in the exchanger and thereby decreasing heat transfer efficiency.

KLINGER manufactures and supplies a range of metallic baffle seals with leaf-like lamellae to effectively seal any gaps between the longitudinal baffle plate and the shell’s inside diameter. Virtually no bypassing occurs, and the shell fluid flow is forced to follow its intended directional path. The result is an increase in the heat transfer effectiveness of the exchanger.

Heat transfer efficiencies could increase by up to 10 percent using a baffle seal arrangement.

picture of bundles

Increases in thermal transfer efficiency result in reduced energy costs and ultimately provide operational cost savings. Depending on the gap dimensions and condition of the components, heat transfer efficiencies could increase by up to 10 percent using a baffle seal arrangement.

A different sealing design concept is applied to the gaps between any single segmental transverse baffle plates that may be present on tube bundles and the shell’s inside diameter. In this instance, a compressible wire mesh packing is used within a holder, which itself is wrapped around the outer circumference of the baffle plate to reduce and minimize any cross-baffle flow.

The seals are manufactured from German DIN 1.4571 material (stainless steel 316Ti) as a standard, but can also be provided in other material options based on specific process media conditions. The seals are fitted easily and under most circumstances require no additional tooling, drilling or bolting of the seal to the baffle plate.


Thermoseal Inc. is an expert in and leading manufacturer of fluid sealing materials and fluid control products. The company carries a range of baffle seals at its Houston location to fit the most commonly encountered baffle plate thicknesses, from one-quarter of an inch to three-quarters of an inch. Other sizes are also available on a make-to-order basis. The seals are supplied in pairs and cut to the exact length required for any specific heat exchanger application.

For more information, contact Gallagher Fluid Seals. We are an authorized distributor for Thermoseal and can provide engineering application expertise.

THE KLINGER-SAVER – Eliminating Hand Injuries During Installation

picture of klinger-saver

In addition to KLINGER’s complete Sheet Gasketing Product Line which now includes the new major change in construction of their PTFE Products TC 1003, TC 1005, and TC1006, they have added a great new product to cover additional applications during day-to-day operation.


The KLINGER SAVER

A new product we are featuring on our blog is THE KLINGER-SAVER – a tool to eliminate hand injuries.

Bolt tightening or loosening activities, or using slug wrenches and hammers can often the cause of serious finger or hand injuries.

 The KLINGER-SAVER is a safety device that allows an assembly technician to remove his hand from the potential danger of being struck by the hammer.

klinger-saver


How The KLINGER-SAVER Works

The wrench is held securely in place on the nut with webbing attached to a strong rubber cord, which is tensioned and locked within a plastic distance tube.

how the klinger-saver works


What comes with the KLINGER-SAVER?

The KLINGER-SAVER is supplied as a complete kit, including an extension tube. The extension tube allows further separation from the strike zone, particularly when helpers are involved, or for hard to reach bolts.
Materials
  • Supplied in a highly visible bright yellow color.
  • The distance and extension pieces are molded from high impact resistant polypropylene.
  • The cord is molded nitrile rubber with a 60 Shore hardness.

KLINGER-Saver is a product of Thermoseal.

For more information about this product, contact Gallagher Fluid Seals‘ engineering department.

Low Temp Gaskets – How Low Can You Go?

Rare and Ultra-Pure Resources Present Unique Challenge to Finding Appropriate Low Temp Gasket

Modern technology often requires rare or ultra-pure materials that can only be handled or obtained within extreme environmental conditions. These same conditions present unique and hazardous difficulties when transporting or utilizing these resources. Resources such as liquid oxygen, nitrogen, or argon; all of which are classified as “industrial gases” are handled well below the normal temperature ranges that every-day liquids exist; ranging as low as -195.8°C (-320.4°F). This often makes it a challenging task to find a low temp gasket to fit the specifications for the application.

As an example, let’s look at argon; an important gas used in Welding, Neon Lights, 3D Printing, and Metal Production, just to name a few. It is far more economical to house and transport argon in its liquid state. However, it must be held at an astonishingly low -185.9°C. Fitting the pipes together and maintaining a seal in a cryogenically engineered system that the liquid argon is housed presents unique difficulties. Argon gas is colorless, odorless, tasteless, and can irritate the skin and the eyes on contact. In its liquid form it can cause frostbite.

There are important considerations that should be taken into account when installing gaskets for dangerous extreme low temp materials.

Proper Gasket Installation

Many gasket materials can become brittle, crack, shrink, and blow out when exposed to extreme cold – not something you want to happen at any time, let alone with a liquid that can freeze you into a meatsickle. So, proper installation is also key. During installation, it is important that all parts are dry, the installation is done at ambient temperature, and then re-adjusted with changes in temperature.

Cryogenics

Any mechanical seal that is sealing a product with a temperature below 0 degrees Celsius is given the name “Cryogenic”. Liquefied gases (LNG), such as liquid nitrogen and liquid helium, are used in many cryogenic applications, as well as hydrocarbons with low freezing points, refrigerants and coolants.

When selecting a low temp gasket or sealing material to be used in cryogenic service, it is important that the material can withstand cryogenic temperatures.

Low temperature applications are found across many industries, these include:

  • Chemical
  • Food
  • Pharmaceutical
  • Refrigeration
  • Petroleum
  • Automotive

Garlock GYLON® and KLINGER SLS/HL

3500 and klinger flexible graphite

Good gasketing materials that can withstand the frigid cold and are pliable in the requirement to maintain the seal would be the Garlock GYLON family of gaskets (PTFE, capable of -450°F (-268°C)) or the Klinger SLS/HL, which is made of flexible graphite and can withstand -400°F (-240°C)

Conclusion

As with all gasket applications, environmental conditions should be considered in conjunction with the functional requirements of the device. Though there are limited options to solve extreme low temp gasketing challenges, Gylon and Klinger can be a good fit for your application.


Portions of the original article were written by Michael Pawlowski and Sylvia Flegg of Triangle Fluid Controls Ltd. The article can be found on Empowering Pumps website here.

For more information about low temperature gaskets and which might be a fit for your application, contact Gallagher Seals engineering department.