Axial Seals

TM Series Seals

Tyton-Fematics axial seals are designed for durability, wearable parts lasting 2 to 3 times longer than other types of seals. Fematics Canda Inc. has spent years developing a composite sealing ring that is very efficient, requiring replacement once only every 5-8 years or longer, depending on the working condition at site. You can find these types od mechanical seals in :

Conventional axial seal designs use springs as the initial closing force and then rely on turbine pressure to keep the seal closed, giving only a very limited amount of adjustability for the film thickness. New designs rely fully on compressed air as the closing medium of the seal thus guaranteeing 100% adjustability to find the perfect balance and the optimal film thickeness for every application and operation.

In combination with the correct cooling water filtration quality, the correct cooling water flow and the right balance between the forces and pressures those new seal designs can be adjusted to the perfect operating conditions that result in direct maintenance savings and more generating time for hydro dam owners and operators.

  • Francis Type Turbines
  • Kaplan type Turbines
  • Pump Turbines

Operational Limits

Max. Turbine operating pressure Up to 150 PSI (1000 kPa)
Recommended barrier pressure 10 PSI (70 kPa) above turbine pressure
Max. Shaft diameter Unlimited
Recommended water quality 50-75 microns
Radial shaft dislocation allowance +/- 3mm (0.120 in)
Axial shaft dislocation allowance Based on customer requirements

Working Principle :

With the axial type seal, the sealing action takes place between two mating rings ; one stationary, the sealing ring, and the other rotating with the shaft, the seat ring. This eliminates the need of a costly shaft sleeve and wear on the shaft surface.

For best performance, it is required that the sealing ring is held in close contact with the seat ring. Most designs use compression springs to push down the sealing element. This type of seal closing design does not take in consideration variability in the turbine pressure, as the springs always apply the same amount of pressure on the mating faces. Today, this type of design is still very popular in these types of seals.

Fematics Canada Inc. has developed a unique alternative to the traditional design in which compressed air is used instead. This design is much simple for installation, maintenance and daily operation, as you have no spring type arrangement all around the seal. The greatest advantage is that this type of configuration makes the seal fully controllable. Combined with a differential pressure regulator, located on a control panel, the pressure inside the air chamber can vary with the turbine pressure, so the seal is always closed at the proper pressure. Not too tight that the sealing face will be worn quicker, not too loose that water will seep out of the seal. Controlling and adjusting the sealing position is a great advantage when the pressure conditions at site are changing. The operator can then control the sealing wear, and also the rate of leakage, wich makes this type of seal a fully controllable, leak proof mechanical seal.

Quick overview of the Tyton-Fematics
Axial Seal closing principle

Our sealing rings are manufactures in our Montreal based plant, and can be custom fabricated to your demands. We offer long wear allowance (12mm) on our sealing face, wich means many years of maintenance free operations.

470mm Sealing Ring

2050mm Sealing Ring

Where can we find them :

We have been making our proprietary composite seals for more than twelve (12) years now. Our seals are installed all around the world :

Canada Ireland Argentina
Brazil Guinea Buthan
United States of America New Zealand India

Sealing Materials

Composite Sealing Ring TJ400/450

After extensive R&D, we have designed the perfect materials to be used in our Axial type seals. The Tyton-Fematics Composite Sealing Ring is the next generation of sealing face, providing an extremely flexible surface, while being a very long lasting material.

2050mm Composite Sealing Ring
Used in a pump turbine application

Our sealing rings are manufactured out of two materials. The base materiel (TJ400), a very solid glass fiber and resin mix, that can be basted out in many different shapes, to reflect the different turbine outline, and to match the different mechanical seal principles we use. The composite buildup (TJ450), is out of our proprietary carbon mix, to offer you with a high performance, extremely long-lasting sealing surface.

Base Material (TJ400)

Composite Buildup (TJ450)

Our TJ450 material is casted in house, so wear length can be adjusted upon your specifications. The wearable length of our composite varies between 1/4’’ to 1-1/14’’ (6-32mm), depending on water cleanliness and lifetime requirements. Tyton-Fematics sealing rings can last 8-12 years in operation, depending on water quality and turbine speed.

View of typical wear lenght of our TJ450 composite buildup

The other advantage of our composite sealing rings is that after giving you many years of incredible face sealing, the worn-out composite can be machined off and recasted to the original specifications. All you need to do is send the used sealing ring back to our shp in Montreal, Canada, and we will refurbish your old seal into a practically brand-new seal, for a fraction of the price of a complete replacement. We recommend that for each time you change/refurbish two (2) sealing rings, the seat ring should be sent for inspection, it can be relapped or will need to be replaced, depending on wear and general condition.

Carbon Segments TG615

We only use high-grade carbon, to manufacture our carbon segments. All of our carbon segments are manufactured in house, in our Montreal based plant, which allows us to keep control on our manufacturing and ensure a quick turnaround time for our customers.

A small hole, located on the top of the carbon segment, allows water to flow to the sealing surface, providing lubrication and cooling to the mating surfaces.

Fematics Canada Inc. offers 1/2’’ (12mm) of wearable material and a high precision surface finish (machining tolerances within 12 microns (0.00005’’), and easy to read installation identification on each of our carbon segments.

TG615 Axial seal type carbon segments

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