ALLEGRO SAFETY 9518-08 Venturi Blower, Steel, 14.37 Inch Base Diameter

Uses:

Allegro 9518-08 Venturi blower produces a large volume of air suction for extracting toxic or explosive gases and discharging them out through a large, galvanised exhaust cone. This pneumatic Venturi blower is ideal for creating positive pressure in a tank by using clean breathing air to provide a safe environment for the workers to enter the tank. It also eliminates accumulated welding fumes & smoke from shipyards, underground areas or manholes to prevent explosions. It is used to efficiently cool down workers & heavy equipment before maintenance & repair during extremely hot working conditions.

Working Mechanism:

How does a Venturi air blower work?
These Venturi style pneumatic air blowers use small volumes of high velocity air to circulate through their base and run out through the casing and nozzle jets. This mechanism creates a Venturi effect to pull in air through one end and blast out through the horn shaped diffuser for moving large volumes of air containing gas / vapour, dust & particulate matter.

Compatible Accessories:

• Allegro 9518-08 Venturi blower can be used with retractable, non-collapsible ducts (sold separately) to channel air from the diffuser to the desired location. These ducts have PVC coated vinyl & polyester construction for light weight and temperature resistance up to 180 degrees F. The ducts work best when pressure is driven using a blower or inline fan.
• Raptor Supplies can also deliver replacement grab handles & grounding lugs for replacing old, worn out or faulty parts of the Venturi blower. The grab handles are used to carry the unit from one place to another, whereas the grounding lugs provide a grounded connection to prevent short circuiting or explosions.

Standards and Approvals:

Allegro 9518-08 Venturi blower is attached to a standard / statically conductive duct that is manufactured in accordance with ASTM 227 standard for high tensile strength & durability.

Installation:

• Allegro 9518-08 Venturi blower has 3 or 4 mounting holes for quick installation on tank openings.
• The blower is connected to a ground connection on the tank through a ground wire.
• The blower is then attached to a compressor or other compressed air sources through a hose, to supply compressed air or steam.
• Now, the Venturi blower is ready for extracting gases and fumes out of the tank and discharging them through a large, galvanised exhaust cone.

Frequently Asked Questions:

Q. What is the maximum temperature that a ducting can handle?

A. The maximum working temperature that a standard ducting can withstand is 180 degrees F. Statically conductive ducting can handle temperatures up to 250 degrees F.

Q. What is the effect of ducting on the output of a Venturi blower?

A. Several factors can affect the total output of a Venturi blower. The number of bends and length of ducting attached to a Venturi blower adversely affect its output. The biggest reduction in output occurs after the first addition of ducting or bends, thereafter the drop is much smaller.

Q. Can I use two Venturi blowers in the same space, one to ventilate and another to extract air?

A. Yes, using two Venturi blowers in the same space would increase the concentration of fresh air in the space, though the overall air exchange rate would not increase significantly.

Q. Is it better to ventilate or extract air using Venturi blowers?

A. Venturi blowers should be used for positive ventilation in confined spaces. They are also suitable for extracting fumes or toxic air that are generated in a specific location.

Q. Can Venturi blowers be mounted vertically on tanks?

A. Yes, they can be installed vertically above tanks, manholes or other locations by supporting them with proper ingress & egress accessories. These blowers should also be weight, vibration & motion mitigated for secure operation.

Q. What does the CFM rating of a Venturi blower signify?

A. Cubic Feet per Minute or CFM represents the amount of air that can be moved through a room when operating a blower / fan at the highest speed. In order to efficiently cool a room, the blower CFM should be chosen while considering the room space / size. CFM for blowers is a crucial measurement for determining if air can be circulated within the space quickly.

Q. What is the difference between an air mover and an axial fan?

A. Venturi blowers or air movers are generally small in size and operate at very high speeds. They are designed for directing air at different angles with precision. However, axial fans are larger and are more suitable for ventilating larger rooms without considering precision.

Q. How can users select the suitable variant for their needs?

A. Users can select a Venturi blower based on the compressor size required. It can be determined by checking the chart of air consumption at various inlet pressures. The 'air consumed' data indicates the amount of hazardous air / fumes that a Venturi blower can consume for degassing chemical tanks and similar industrial confined spaces. Another point to be noted while selecting a Venturi blower is the total volume of the space to be ventilated.

Q. What are the applications of Venturi air blowers?

A. Venturi blowers are mainly designed for confined space ventilation of hazardous gases or vapours for routine maintenance and cleaning operations. These blowers are widely used in the petroleum processing, chemical and marine industries, as well as in power plants, refineries and shipyards.

Q. What types of ducting are available for Venturi blowers?

A. Ducting for Venturi blowers is offered for both standard and statically conductive environments. Standard ducting is offered in 5 diameter variants (8, 12, 16, 20 and 26 inches) and statically conductive ducting is offered in 4 diameter variants (8, 12, 16 and 20 inches). The ducting is retractable and has a non-collapsible design for carrying large volumes of air.

Q. How does a Venturi blower work?

A. Allegro 9518-08 Venturi blower uses compressed air or saturated steam, having a maximum inlet pressure of 140 psi supplied through an air source. A Venturi blower circulates air inside its casing for creating a Venturi effect & pulling in air through one end to blast it out through the horn-shaped diffuser.

Q. What other variants of Allegro 9518-08 Venturi blower are available on Raptor Supplies?

A. Raptor Supplies delivers Venturi blowers in variants having extra small, small, medium and extra large base diameters. Both the total airflow & air consumed by the Venturi blower increase as the base diameter grows larger.