Spiral Pipe - Commercial Spiral Pipe -Spiral Welded Pipe - 2004 Catalog

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Installation of Spiral Pipe and Fittings, Friction Loss and Air Leakage, Connection of duct and fitting

Installation of Spiral Pipe and Fittings

Fittings and Small-End couplings are male sized (small-end) to slip inside spiral pipe and flexhose.
Fitting-to-Fitting connections are made by using a Large-End coupling or a short length of commercial spiral pipe.
Our duct work is not flared or belled on one end for the "air flow" type of joint.
It is recommended that you place silicone caulking about one inch in and around the inside of the spiral pipe before you assemble any fitting. Secure the connection with steel (not aluminum) pop rivets. Place a second bead of silicone around the outside of the connection, and smooth around connection.

Pipe-To-Pipe Connection

Spiral pipes are connected together by a sleeve type coupling (Part No. COUP). The coupling has a small-end and is slipped into the pipe sections.

Fitting-To-Fitting Connection

Fitting-to-Fitting connections can be made by cutting a short length of spiral pipe and using this length of pipe as a female coupling or by ordering a type COU2 female coupling.

Fitting-To-Pipe Connection

All fittings are sized to slip into mating pipe sections or flexhose. No additionalcoupling will be needed.

Friction Loss and Air Leakage

Two problems with high velocity systems are friction loss and air leakage. The installer has to install the high-pressure system without causing possible friction losses or air leakage problems. Do not crimp the ends of the fittings to make assembly easier. The crimping puts interference in the air stream, which adds friction loss to the system. Crimping can also create noise problems. Excessive clearances in sizing of the spiral welded pipe and fittings can cause problems in sealing the system to make it airtight. Hunting and patching leaks in an installed system is tedious and stressful.

Your spiral duct and fittings are sized to fit tightly for 3 good reasons.

The joint has a minimum friction loss condition.
The tight fit makes the joint easy to seal against air leakage
Noise is reduced with a tighter joint.

Connection of duct and fitting

Starting the fitting into the duct.

A sharp blow by a sheet metal hammer or mallet on the top of the fitting collar can help the collar to seat into the duct. Be careful not to dent the collar.

Starting the collar into duct, impact at A

When a sub-assembly is put together on the floor, raise the end of the duct to support it off the floor by a piece of wood. Tilt the fitting slightly and start the bottom part of the fitting collar into the duct.

Starting the collar into duct, drive blade B in direction of arrow.

A strip of metal can be slipped into the space between the duct and fitting and driven around the joint circumference. The fitting is worked to keep the collar in but, do not push too hard and bind the end of the duct and fitting so the fitting can't slip into the duct.

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Should you have any questions, we offer a Frequently Asked Questions section that answers the many questions submitted to us over the years.

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We welcome your questions and comments. If you want to contact us, your can either send us an email at sales@airhand.com or phone us at either: 800.367.3828 or 203.389.9595.
Our fax number is:
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Our company has over 50 years of expertise with a deep commitment of customer service. We are the single source for all your dust & fume collection and industrial ventilation components. You can rely on Air Handling Systems for cost-effective, high quality components. Our technical sales staff is ready to help solve your problems.

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