Jetflow Airmover

	Key Features
	Selecting a Jetflow Airmover
	Operating guidelines
	Model Ranges
	Typical Applications
	Request Catalogue

The Jetflow Airmover is operated by compressed air. Its effect is to produce a high velocity jet of air which is ideal for safe effective auxiliary ventilation. In generating the high velocity jet a negative pressure is created at the inlet which enables the Jetflow Airmover to extract fumes, move lightweight materials, lift liquids and power suction lift devices.

Key Features

• Safe operation
• No moving parts
• No electrics
• Minimum maintenance
• Easy to install
• Easy to control
• Efficient
• Compact
• Portable
• Robust
• Quiet operation

Selecting a Jetflow Airmover

Airmover free delivery performance curves

By comparison establish which graph (pages 4-11) will give the required output flow. Locate this figure on the left or right hand vertical axis. Draw a horizontal line from the required figure on the vertical axis until it touches the output flow curve. Draw a vertical line from the point on the curve to the top and bottom horizontal axis. The point of contact will denote the manifold pressure required to achieve the output flow. The vertical line from the curve will also intersect the broken red curve (make sure the gap setting on the broken curve is the same as the chosen flow curve). Draw a horizontal line to the right of the intersection point to intersect the vertical compressed air consumption axis. This will denote the amount of compressed air the Jetflow Airmover will consume.

Airmover performance under load curves

By comparison establish which graph (pages 4-11) will give the required flow against a given load. The load should be expressed in mm or inches of water gauge. Locate this figure on the left or right hand vertical axis. Draw a horizontal line until it touches the curve at which the manifold pressure will operate. Draw a vertical line from the point of the curve to the top and bottom horizontal axis. The point of contact will denote the flow the Jetflow Airmover will induce against the given load. Remember to add the primary standard air supply to arrive at the total output flow figure.

Note: For information on using Airmovers in ducted systems please contact Haskel Energy Systems

Operating guidelines

Jetflow Airmovers are compressed air driven and when low pressure air passes over an aerofoil surface it both clings to the surface and accelerates - the 'Coanda Effect'. The diagram below shows how the Jetflow Airmover puts this effect into practice for efficient ventilation.

1. Primary compressed air enters the manifold through a radial connection and is released through an annular gap where it accelerates over an aerofoil surface.

2. Secondary ambient air is sucked into the throat of the Jetflow Airmover to fill the vacuum created by the accelerating compressed air.

3. The induced secondary air mixes with the expanding primary air in the divergent tube.

4. High velocity air emitted from the outlet entrains additional tertiary air into a jet stream which can be directed to either force fresh air, or extract foul air depending on installation orientation.

Installation

Installation can effect performance. The inlet air pipe should be connected to the manifold inlet connection. For static installations rigid pipe can be used. Flexible hose will be more convenient where mobility is required. Pressure losses occur on long pipe lines. To reduce frictional losses, compressed air lines should be as short as possible, with a large inside diameter and the minimum of connection restrictions. A control valve should be installed on the air line to stop and start the Jetflow Airmover, also to regulate flow and pressure. A fine mesh strainer is also recommended to prevent airline contaminants from blocking the annular gap. The gap is factory pre-set. Additional shims are available should it be necessary to change the gap setting of models 40,100 and 200 to suit a particular application. The 10, 20 and 704 models do not use shims. The 10 and 20 are adjusted by using a locking ring. For optimum efficiency the gap should be minimal, for maximum performance the gap is set at maximum.

Model Ranges

• Jetflow 10 Airmover
• Jetflow 20 Airmover
• Jetflow 40 Airmover
• Jetflow 100 Airmover
• Jetflow 200 Airmover
• Jetflow 704 Airmover
• Jetflow HS20 Airmover
• Jetflow HS40 Airmover

Typical Applications

Sewer & tunnel ventilation

Every year unnecessary accidents occur because workmen enter confined spaces without taking essential safety precautions. A sewer is a typical confined space and death can be caused by asphyxiation from methane and carbon dioxide in the sewer. As the percentage of oxygen is depleted bacteria may form deadly hydrogen sulphide. Methane mixed with air is inflammable and at levels between 5% and 9% becomes an explosive gas. Ignition can have disastrous consequences.

Unpleasant smells, toxic and explosive gases have to be diluted and removed before workmen can enter for inspection and maintenance. The Jetflow Airmover is the simplest, safest and most convenient system of auxiliary ventilation. It can be used for blowing or extracting using an integral reversible tripod stand. Normally one Jetflow Airmover blowing down the upstream manhole and a second extracting from the downstream manhole is the best arrangement. Standard flexible ducting can also be used.

Typical sewer being positively ventilated by two Jetflow 100 Airmovers. Determine the wind direction to avoid explosive or toxic gases from the sewer being induced into the compressor air intake or back into the sewer. Note the mobile compressor also has a Jetflow Fume Diluter fitted to the exhaust outlet to cool and dilute the exhaust fumes.
Service tunnels for sewers, drainage, water, cables, gas pipes and transport need a constant and effective tunnel face ventilation. This can easily be achieved by using Jetflow Airmovers. Some tunnels that are driven through clay deposits can experience severe toxic gas problems given off from the clay. (See page 5 of the Jetflow Airmover Mining brochure for more details of large tunnel ventilation techniques.)
Typical hazardous situation where ventilation tubing is not near enough to the tunnel face to ensure good ventilation.
Problem solved by installing a Jetflow Airmover overlap system thus creating a good tunnel face ventilation system.
Jetflow Airmovers should be left operating during the blast cycle so that the harmful dust and toxic explosive fumes are rapidly dispersed into the extraction ducting system. Water introduced into the air flow will suppress the airborne dust.

Tank & pipe ventilation

Storage tanks at refineries, chemical, process and gas plants, waterworks, airports and military depots have to undergo regular internal inspection for cleaning and maintenance. The storage tank is classed as a "confined space" and needs a system of positive auxiliary ventilation to clear dangerous gases before workmen can enter. Sludge on the tank walls and floors can give off toxic or explosive vapours. In addition, many modern cleaning processes use chemicals which release toxic fumes which in turn must be continuously diluted and removed during application.

Jetflow Airmovers have a world-wide reputation for effective, safe tank ventilation and are used by all the major oil companies, tank cleaning contractors, Ministry of Defence and NATO.

		The sketch shows two Jetflow 200 Airmovers; ventilating a large storage tank. One Jetflow Airmover is forcing fresh air in while the other is extracting. The direction of the Jetflow Airmover can be reversed depending on whether the fumes are heavier or lighter than air.
		Production of beer and spirits and other beverages is associated with stationary and mobile tanks, barrels, stills and vats. The major hazard with these processes is oxygen deficiency and an abundance of suffocating carbon dioxide. A Jetflow 40E Airmover can force out the heavier carbon dioxide.
		Construction or maintenance of road, rail and marine tankers requires the presence of workmen inside the tank for welding, inspection, cleaning and maintenance. The sketch shows a Jetflow 100F Airmover extracting welding fumes from the tank and drawing in fresh air. During internal cleaning operations forcing fresh air into the tank is sometimes preferred.
		Joints in many large diameter pipelines for oil, gas and chemicals have to be welded on the inside. The sketch shows how the toxic welding fumes are drawn away from the welder by a Jetflow 200F Airmover manifolded onto the pipe outlet. It also ensures a fresh air supply for the welder. A Jetflow 200F Airmover being used to extract welding fumes during joint welding.

Fume extraction

In an extracting mode Jetflow Airmovers are ideal for removing fumes at source. The Airmovers below are removing cutting oil fumes, catalytic fumes and welding fumes (using a backpack for extra mobility). Fumes can be fully ducted to atmosphere to keep the work place healthy and clean

Cooling & drying

The Jetflow Airmover has a tremendous capability for cooling both operatives and materials. The high velocity jet produces air movement which reduces the effective temperature and can also reduce humidity. A Jetflow Airmover providing an airflow of say 2m/sec, can achieve effective temperature falls of 7°C and humidity falls of 13%.

Extruded aluminium must be rapidly and consistently cooled to prevent distortion. Jetflow Airmovers are used. In some instances, the extruded aluminium can be passed through the throat of the Jetflow Airmover (see drying example on opposite page) to achieve all round consistent cooling. Very high temperatures are experienced during the pouring of molten metals in the iron and steel industry. Jetflow Airmovers are ideal for producing localised cooling during production operations. Brickwork and refractories can also be cooled prior to furnace maintenance and unloading operations.
Jetflow Airmovers are used to dry television tubes after a wash treatment which prepares the back of the tube for a black paint finish. The black paint is also dried by Jetflow Airmovers. The complete wash, dry, paint, dry and package cycle time is significantly reduced.
A major source of heat in modern machinery is a faulty bearing. Expensive production time can be lost if the repair has to take place during normal working hours. A Jetflow Airmover blowing cool air on the bearing housing can dramatically reduce the temperature to allow production to continue and the fault to be repaired at a more convenient time.

Many materials and production processes require large volumes of water and other liquids for cooling or cleaning the finished or semi-finished product. Steel wire drawing or plastic strip extrusions are typical examples of a drying requirement.

Moving material

The Jetflow Airmover has the ability to entrain lightweight particles in its induced airstream and to transport them effectively through pipe/tube systems.

Drilling, sawing, milling and grinding of metal, wood or plastic parts produces large quantities of waste swarf /dust. The Jeff low Airmover can -effectively extract this away from the cutting tools and drill holes, making the work area safe and clean. Swarf from aluminium, bronze or other expensive metals can be ducted into separate containers to maximise scrap recovery.

Many industrial processes produce waste strip which has to be continuously removed at the same rate of production. For example in the paper process industry special cutting machines are used to produce paper to exact width. The end waste strips are fed into Jetflow Airmovers which force the paper through a duct into a nearby collection bin.

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