Fugesco Inc. - Mechanical Seals - marine

By: Fugesco  09-12-2011
Keywords: Seals, control panel, clean water

Marine / Ship Seals

  • Fully split designs
  • Rudderstock Seals - Stern Tube Seals - Bulkhead Seals
  • Air Control Panels - Water Control Panels
  • Filtration Systems - Pre-Filtration Systems
  • Complete Manufacturing In-house

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 (radial and axial) and thrusts associated with such shaft systems. Depending on the operating conditions, many custom arrangements can be used.

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 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.

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 50 microns are removed, in order to prevent abrasive particles entering from under the seal and or the stern tube. The clean water supply must be at a higher pressure than the water pressure from the stern tube. It is recommended to install an automatic differential pressure system with the water supply, maintaining a constant pressure difference above that of the pressure of the stern tube.

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 he keys for use during assembly or disassembly of the housing parts), an O-ring splicing kit, flange sealant, silicon 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 stern tube, 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 faces.

OPERATIONAL LIMITS

Maximum operating pressure: 50 PSI – (1020 kPa)
Maximum shaft speed: 90 f/sec. – (30 m/s)
Barrier water pressure: 5 - 10 PSI – (35 - 70 kPa) above draft operating pressure
Barrier water filtration recommended 50 microns (non-abrasive)
Maximum shaft diameter: 39" – (1000 mm)
Maximum radial shaft movement: 0.125" – (3 mm)
Maximum axial shaft movement: 1.0" – (25.4 mm)

Keywords: Abrasive Particles, clean water, control panel, Face Seals, Hydroelectric Turbines, O-ring Splicing, Pressure Differential, Pressure Regulator, Seals, Shaft Seal, Water Control, Water Control Panel, 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 - axial

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. 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.


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 - 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.