Schauenburg Industries Ltd. Fiberglass Ventilation Ducting is manufactured for use in mining and tunneling applications. Schauenburg combines a filament winding process and phenolic resin for maximum fiberglass duct strength. One of the advantages of phenolic resin is its excellent acid resistance which is a result of the acid cure process. Because phenolic resin is water based and polyester is oil based, phenolic resin is inherently flame resistant, and no fire inhibitors are added. These inhibitors detract from the strength of polyester resins making them more brittle.

 

Destruction Test
 

• Data was collected using a Gardner Variable Height Tester.

• Flex strength ASTM D-790.

• Flex Modulus ASTM D-790.
• Greater stiffness allows higher negative pressure capability at equal weights.

 

Property	Schauenburg Phenolic Duct	Polyester Duct	Interpretation
Impact Test  (In-LBS)	88	72	Ability to resist a point impact
Flex Strength (PSI) (Normalized)	58,619	66,6676	Load bearing strength
Flex Modulus  (KPSI)	2325	1534	Stiffness

Destruction and Presure Test Video



 

Advantages & Features

 

• FRP upholds its integrity in a fire longer than metals. FRP will operate up to 200°C while maintaining stability.

• Fire resistant according to ASTM E-162 with flame spread index of less than 25.

• Will not promote or sustain combustion. Thermal conductivity is much lower than metals 0.20 – 0.24 w/m/k.3. Antistatic properties 10³ ohms @ 1% wt. surface resistivity.

• Noise levels are considerably lower using phenolic fiberglass skins on silencers than with metal skins due to FRP absorbing effect.

• Fiberglass Bell/Spigot ensures a safer installation – eliminating pinch points (flanged joints are available).

• FRP joints – Bell and Spigot can move 7 degrees right to left and up or down for direction.

• Available with a flanged end. Flanges are installed prior to filament winding. Flanged FRP minimizes leakage and provides stabilization from high shock waves during the blasting cycle. V-lock couplings speed up installation.

• FRP is less than half the weight of steel. For example a FRP Oval (36x62) x 20’ = 400 lbs approximately, whereas the identical sized steel vent would be approximately 1,000 lbs.

• Low installation cost due to lightweight pipe.

• FRP joints are manufactured complete with internal rubber gaskets to prevent leakage and reduce resistance at the joints.

• When subject to loading or impact, FRP springs back to shape (memory), while metal will dent and leak and may start to recoil.

• Smooth interior to guarantee low flow resistance and therefore an increase in powwer savings.

• FRP is EMR/CSA and MSHA approved for underground.

• Can withstand high positive and negative pressures.

• Acid mine water resistant and rot proof.

• FRP quick repair kit is available.

• Long service life.

Principles of Operation

 

The Spin Filter contains a series of tubes with stationary air spinners. Through centrifugal force contaminants are removed from the air stream as it is drawn through the tubes. The steps of purification are outlined below.

 

1. Air is drawn or forced through the intake transition area and is mixed with water droplets from strategically placed sprays; the water droplets being sized from 3 to 20 microns.

2. The water and dust particles attach to each other, and by centrifugal forces imparted by the Spin Filter, are separated from the main airstream and discharged through a water trap to disposal point as slurry.

3. Clean air containing unused water droplets continues through the unit and is separated at the demister panel, the excess water being piped away with the underflow slurry.

The cleaned air passes through to the main fan and rejoins the exhaust air circuit, or is discharged to the ambient atmosphere. By adjusting the flow rates and pressure of the intake water line, large variations of dust capacity and air flow rates can be accommodated.

 

Advantages of the Wet Scrubber

 

• Collection of dust in a wetted form eliminates a secondary dust problem in disposal of collected material. Some dust presents a risk of explosion or fire hazard, the wet procedure significantly reduces or eliminates the hazard.

• Have the ability to handle high temperatures and moisture laden gases.

• With the fan on the clean air side of the collector, less power is required.

• With periodical flushing caking is not a problem.

• The principle mechanism is impacting of dust particles on the liquid droplets, created by nozzles.

• Has the inherent ability to humidify through the process of adding water vapour to the air stream through evaporation.

The Fan Silencers have been developed over the years by improving on a basic concept. With noise reduction, strength, long lasting and ease of maintenance as criteria, our design offers the optimum in fan noise suppression.

 

 

Centre Core Section

 

We have strengthened the centre core section by manufacturing with expanded metal mesh. This maintains as smooth an inner surface as possible for maximum air flow with little pressure drop, but still allows the silencing medium to achieve desired properties. With the center core kept rigid, the ventilation line is not disturbed during scheduled maintenance of the silencer.

 

Silencing Medium

 

The packing consists of a fiberglass insulation selected for maximum silencing properties. We start with 6” fibreglass and compress it to 3”. This is held in by a fiberglass screen between the insulation and the expanded metal mesh.

 

Outer Skin

 

On the outer portions we have selected fiberglass to achieve the lightweight, strong, noise dampening qualities sought in fan silencers. As mentioned we design our silencers with maintenance in mind and the outer skin is flange fitted for quick removal. The silencing medium is then exposed for a complete change with the fan and the ducting kept intact by way of the centre core.

The Schauenburg Cassette System was originally designed to facilitate the installation of flexible ventilation ducting in rapidly excavated headings and consist of three basic components: the fan cone, the duct storage cassette and the draw off cone. The duct storage cassette normally holds 100 m of flexible ventilation ducting and consists of an outer casing and an inner tube, the annular space between the two pieces being the storage area for the ducting. A draw off cone is attached to the inner tube to facilitate orderly pay out of the ducting and smooth airflow through the cassette unit. The third portion, the fan cone, is used to direct the air from the pressure fan through the centre cone section and remain attached to the fan when removing and installing replacement cassettes.

 

Advantages

 

• Low initial cost of flexible duct and cassette system over conventional steel ducting.

• System is designed to operate at positive pressure airflows and by positioning the fans at the correct location, can be used on either fresh air in the duct or exhaust air in the duct system.

• To meet the requirements of the push-pull system with the addition of reversing switches on the fans, the total system can be designed to meet all underground ventilation codes and coal mining regulations.

• Lower labour cost to install ducting; as the boring machine extends the ducting automatically. The only labour required to install the ducting while the boring machine is in operation, is one man every 5-10 m advance to install one suspension clip on the messenger cable.

Installation of a fully loaded cassette takes approximately 45 minutes and can be handled when preventative maintenance work is being carried out on the cutting head.

• Face ventilation is maintained at all times as the unit is close coupled to the boring machine and cannot be left 30 m back from the face as is often the case with steel duct.

• Site storage problems are eliminated as 5000 ft of flexible ducting can be stored in the open air in a space approximately 10 m x 10 m, whereas the equivalent amount of steel duct will occupy a large amount of valuable site storage space.

• Upon completion of the project, transportation of the steel duct is often uneconomical and is scrapped. Flexible ducting can be cleaned, stored and transported with minimal cost, to be used on other projects, again saving capital costs.

• Utilizes a pre-loaded container (cassette) which can be refilled on surface and taken to the workface as a complete unit, therefore requiring no extra labour underground.

• The cassette unit is totally detachable and interchangeable with replacement units. Capacity is up to 100 m (328 ft). Available in diameters from 18' to 80”.