Tag Archives: Thermoseal

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.

Thermoseal WaterSIL

WaterSIL is a universal high-pressure gasket material that is certified to NSF 61 and meets strict chemical leaching requirements.

Specially formulated compressed gasket material based on NBR and aramid fiber, Thermoseal WaterSIL is a universal high-pressure gasket material that is certified to NSF 61 and meets strict chemical leaching requirements.

Applications: NSF/ANSI 61 certified gasket material for use in potable drinking water systems and fixtures for public drinking water, food and beverage, hospitality and plumbing supplies.

Benefits of Products Certified to NSP/ANSI 61 Drinking Water System Components

Potable water systems have miles of piping and other devices such as pumps, meters and valves. All of these components require gaskets. Gasket materials certified to NSF/ANSI 61 ensure the safe passing of water on its journey to the consumer’s tap.

NSF/ANSI 61 establishes minimum health effect requirements for the chemical contaminants and impurities that are directly imparted to drinking water systems. It also determines what contaminants may migrate or leach into drinking water and confirms that they are below the maximum levels allowed to be considered safe. Market leaders strive to attain NSF certification as a mark of distinction that assures their product does not leach harmful contaminants or impurities into drinking water.

Certification to NSF/ANSI 61 ensures that the product meets the Safe Drinking Water Act requirements that protect public drinking water supplies in the US. NSF/ANSI 61 certification can often meet or fulfill the testing requirements for many other countries as well.

THERMOSEAL WaterSIL is specifically formulated to meet the NSF/ANSI 61 standard for sealing materials. It also has excellent dielectric strength properties. The dielectric strength is the maximum working voltage a material can withstand without breaking down, thus limiting corrosion in pipeline systems.

Look for the THERMOSEAL WaterSIL logo and NSF mark on the packaging to ensure your gasket material complies with NSF/ANSI 61 – Drinking Water System Components – Health Effects.

picture of thermoseal watersil graph

 


Gallagher Fluid Seals is an Authorized Distributor for Thermoseal Inc., an independent KLINGER Company.  We stock and distribute many different styles of Thermoseals’ compressed fiber gasketing, as well as PTFE and Graphite based materials.  If you need to know which type of Thermoseal material is best for your specific application, please contact us today.

S.T.A.M.P. Gasket Selection Criteria

GasketWe recently updated our Gasketing webpages to provide our customers with much more robust product information, to help you along your journey of finding the right gasket for your application.  Visit our Non-Asbestos, Metal, Elastomeric, or ePTFE Gasket Tape pages to learn more.


S.T.A.M.P.

When you’re specifying a gasket for even the simplest application, it is important that the gasket supplier know all the operating parameters.

There are five major pieces of information needed to select the appropriate gasket, known by the acronym S.T.A.M.P.:

Gasket - Raised Face FlangeSize:

While gaskets are most often used in standard ANSI flange connections, non-standard flanges can also be found throughout a plant.  In dealing with non-standard flanges, it is VERY important to obtain as much detail as possible about the contact dimensions (the portion of the gasket actually being compressed) and the fasteners or bolts being used (size, grade, quantity). This information is used to calculate the contact area and available assembly stress – a key factor in the selection process, as an improperly loaded gasket could result in premature equipment failure.

Continue reading S.T.A.M.P. Gasket Selection Criteria

Form-in-Place Sealex® Joint Sealant

Sealex®Sealex® joint sealant, specially processed, 100% pure PTFE on a roll, provides soft, highly compressible gasketing for longer life and trouble-free sealing. Its form-in-place versatility also cuts maintenance and storage costs. The high compressibility of Sealex® enables it to effectively fill flange imperfections for a tight, leak-free seal. Under pressure, it provides a very wide, thin ribbon-like joint sealant. Unlike conventional PTFE which is prone to cold flow, Sealex® has good creep resistance and bolt torque retention properties.

Sealex® joint sealant does not support bacterial growth or cause product contamination and is FDA compliant. It has virtually no shelf-life concerns since PTFE is unaffected by normal environmental conditions.

It has excellent resistance properties to chemical attack. It is ideal for most chemical services at temperatures to 500°F (260°C) and pressure to 2,000 psi (138 bar). It is also suitable for cryogenic use to -321°F (-196°C).

Continue reading Form-in-Place Sealex® Joint Sealant

Isolation Gasket Solutions from Thermoseal

KLINGERSIL® C-7400 Isolation Gaskets

Application Overview:

Some applications in plants call out for isolation kits to maintain the integrity and reliability of a pipeline and piping system. Isolation kits are designed to work in conjunction with flanges, gaskets, and/or bolt sleeves and washers by eliminating metal-to-metal contact and halting static electric currents. At times they are relied upon for critical applications in severe temperatures and conditions.

KLINGERSIL C-7400 - Isolation Gaskets replace Isolation Kits

The Problem: 

Industry’s first choice are phenolic gaskets. They are often supplied in kits, but they are hard and typically take a lot of load to seal. And lack of load is the number one reason for gasket failure.

Continue reading Isolation Gasket Solutions from Thermoseal

Gasket Installation Procedures: Best Practices

Brought to you by Thermoseal®

Gasket InstallationThis blog provides guidance to maintenance operators, engineers and fitters to ensure successful gasket installation and assembly of bolted flange connections. However always check plant-approved installation procedures first.

The successful operation of a gasket depends upon a multiplicity of factors including the style and quality of the gasket material, but also the medium being sealed, the flange design, the amount of pressure applied to the gasket by the bolts and how the gasket is assembled onto the flanges and tightened. Very basic causes often lead to leakage in bolted joints, and in most cases, it is not just the gasket but also the human element. Users should evaluate all conditions to validate the products are suitable for the intended process.

Tools Needed

Specific tools are required for cleaning the flange and tensioning the bolts. Always use standard safety equipment and follow good safety practices. The following tools are required for removal of the old gasket and installation of the new gasket:

  • Calibrated torque wrench or hydraulic tensioner
  • Brass wire brush
  • Personal safety equipment
  • Lubricants for the bolts (if specified)
  • Other plant-specified equipment

Continue reading Gasket Installation Procedures: Best Practices