Fugesco Inc. - Mechanical Seals - axial

By: Fugesco  09-12-2011
Keywords: ring, Seals, Turbine

Axial Seals

Our axial type seals are specifically designed for application to hydroelectric turbines and large water pumps for sewage handling, filtration and irrigation, etc.

Our axial type seals are self aligned, balanced split face seals capable of withstanding the heavy torques, pressures, shaft movements (radial and axial) and thrusts associated with such shaft systems. Depending on the turbine’s operating conditions, many custom arrangements can be used.

The seal components are usually split to ease installation. A basic turbine seal consists of a base ring and a cover ring forming a cavity which houses the sealing rings. The cover ring is secured to the base ring, which in turn bridges the gap between the turbine shaft and the head cover. The base ring also serves to house the inflatable seal when required.

The sealing action takes place between two mating rings; one stationary, the Sealing Ring, , the other rotating with the shaft, the Seat Ring. The axial direction of the sealing action prevents damage to the turbine or pump shaft, since the wear is taking place between the Seat and the Sealing Rings, and not on the shaft.

The Sealing Ring is held in contact with the Seat Ring by a spring force and the hydraulic force of flushing water. These properties balance the seal at all times.

The purpose of the inflatable seal is to allow for the replacement or inspection of the seal faces without dewatering the turbine. The shaft must be at rest when the inflatable seal is in use. The design of FUGESCO’s inflatable seal does not require any special tools or fixture for vulcanization. Our design uses male and female ends and can be installed in much less time than the vulcanized type. A flow of clean water, free of abrasive particles must be maintained throughout the seal, to provide cooling, lubrication and to reduce wear of the sealing surfaces. Water should be filtered to ensure that impurities larger than 25 microns are removed, in order to prevent abrasives particles entering from under the seal. The clean water supply must be at a higher pressure than the water pressure under the seal. It is recommended to install an automatic differential pressure system with the water supply, maintaining a constant pressure difference above that of the pressure under the seal.

On certain models of our seals, the water is injected directly between the mating faces. By controlling the seal water flow in the annular profile between the faces provides the benefits of a double seal since it allows control of the seal’s environment through cooling, lubricating and cleansing, as impurities are prevented from entering in between the mating faces.

All of our seals include an assembly kit (consisting of: eyebolts, jacking screws and hex keys for use during assembly or disassembly of the housing parts), an o-ring splicing kit, flange sealant, silicone grease, a piping connection identification plate and three copies of the installation, maintenance and operation manual.

In order to regulate the pressure differential between the shaft seal and the turbine, a seal water control panel complete with an automatic differential pressure regulator can be supplied with each seal. The positive pressure differential is necessary to prevent abrasive particles from entering the seal chamber.

OPERATIONAL LIMITS

Max. turbine operating pressure:         

1034 kPa (150 psi)

Max. recommended barrier water pressure:

20-70 kPa (3-10 psi) above turbine pressure

Recommended water filtration:

25 microns

Radial shaft dislocation:

± 1.3 mm (0.06”)

Axial shaft dislocation:

± 3  - 25 mm (0.125” – 1”)

Shaft/sleeve finish:

63 RMS

Shaft sizes:

up to 1800 mm (70”)

Keywords: Abrasive Particles, Base Ring, clean water, Face Seals, Hydroelectric Turbines, Inflatable Seal, ring, Sealing Rings, Seals, Turbine, Turbine Seal, Water Pumps, Water Supply,

Contact Fugesco

Email - none provided

Print this page

Other products and services from Fugesco

09-12-2011

Fugesco Inc. - Mechanical Seals - radial

The cover ring can also be designed to act as a reservoir to accumulate water on top of the seal to prevent a dry running condition of the top sealing ring in the event that the turbine is operating under vacuum conditions. For easier installation we recommend the use of an intermediate ring with the stop pins located between the two sealing rings in order to facilitate installation.


09-12-2011

Fugesco Inc. - Mechanical Seals - accessories

One of the many advantages is that it adjusts itself to the thickness between the carbon segments, thus allowing the carbon to be better retained even during heavy vibrations. Since the springs are manufactured in-house, we can easily control our product for better materials, necessary tension, faster delivery terms and better prices.


09-12-2011

Fugesco Inc. - Mechanical Seals - filtration

Our filters have proven themselves for more than twenty-five years and are the result of many years of research and development, which today provides filtration 10 to 20 times finer than that of sand filters now available on the market. Our specialists will recommend the filter with the right capacity for your needs based on the volume of water, flows, available space, all depending on the quantity of seals in your power plant.


09-12-2011

Fugesco Inc. - Mechanical Seals - marine

Our axial type seals are specifically designed for application to stern tube seals, hydroelectric turbines and large water pumps for sewage handling, filtration, irrigation, and more. Our axial type seals are self-aligned, balanced split face seals capable of withstanding the heavy torques, pressures, shaft movements and thrusts associated with such shaft systems.


09-12-2011

Fugesco Inc. - Mechanical Seals - controlpanel

The Pressure Regulator is a compact self-operated pressure regulator that uses spring force to maintain a differential pressure between the seal and the turbine. A High Signal Magnetic Flow meter System designed to handle difficult high-noise application while maintaining the benefits of dc technology. Two Pressure Gauges are included; one gauge indicates the pressure under the seal and the other gauge indicates the pressure inside the seal.