OPUS

Domestic Water: Galvanized Steel Pipe

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Domestic hot and cold water systems generally convey potable hot and cold water used for...
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Steel pipe that has been dipped into a molten zinc bath is commonly known as "Hot...
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Benefit of Material to Systems Application

Typical domestic water systems are classified as hot and cold.  In cold domestic water systems, galvanized steel is very popular and is used as much or more than copper, particularly in larger sizes, due to its lower material costs. Galvanized pipe is typically used for cold domestic water only, as hot water temperatures may have an adverse effect on the galvanized coating, causing accelerated scale build up on the interior of the pipe. The hot dipped galvanized coating provides a protective coating to the pipe, ensuring that no adverse chemicals leach into the domestic water system.

System Application and Material Usage

Galvanized steel pipe is available in typical sizes of ½" – 12" for domestic water systems and is also available in larger sizes where necessary.  The mechanical properties of the galvanized pipe make it suitable in all cold potable water systems.  Galvanizers have had their material and processes evaluated in accordance with ANSI/NSF-61 with great success.  However, it is incumbent upon the purchaser to determine if the supplier has the appropriate approvals to demonstrate acceptability in domestic water systems. 

Galvanized pipe may be cut or roll grooved for use with grooved mechanical couplings.  It may also be threaded or flanged.  It should be noted that whenever galvanized is cut, as when cut-grooved or threaded, the zinc coating is removed and the corrosion resistance is lost.

Many health hazards are associated with welding of galvanized pipe, therefore welding is not a common joining method and flanges must be threaded onto galvanized pipe or welded onto the pipe prior to it being galvanized. Further, welding burns off the zinc coating, so the welded area will be susceptible to corrosion.

When connecting a galvanized piping system to a copper system, a dielectric waterway or dielectric union should be installed to prevent galvanic corrosion. No special material handling is required.

Manufacturers and Suppliers Participating in OPUS

ANVIL International

Anvil International offers a full line of domestically-produced iron fittings, steel nipples,......
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Embassy Group LTD

Embassy Group LTD is a 100-percent member owned, 3.2 billion dollar corporation consisting of......
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F.W. Webb Company

F.W. Webb Company is a multi-faceted distributor of plumbing and heating, HVAC and controls,......
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Ferguson

Ferguson specializes in providing PVF, Plumbing, HVAC and Related Specialty Products and......
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Galloup Company

J.O. Galloup Company is a premier distributor of commercial and industrial piping products,......
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MORSCO

MORSCO is a leading U.S. distributor of commercial and residential plumbing, HVAC, and PVF, with......
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Mueller Industries, Inc.

Mueller Industries, Inc. is the leading U.S. manufacturer of copper tube, copper fittings and......
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Tyco Mechanical Products

Grinnell Mechanical Products, a leading brand of Tyco International Company, manufactures a wide......
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Victaulic

Victaulic is the world's leading manufacturer of mechanical pipe joining products. For over 80......
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Weldbend Corporation

Weldbend Corporation is a manufacturer of carbon steel welding fittings and forged steel......
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Winsupply

WinWholesale, Inc. is comprised of over 525 wholesale distribution locations. Along with Noland......
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Woodford Manufacturing Company

Woodford Manufacturing Company offers frost-free, backflow protected commercial, residential and......
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Applicable Joining Methods

Flanged

Flanging maybe used for threaded or plane-end pipe. After a flange component is installed on the...
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Grooved

Grooved pipe joints consist of two grooved pipe ends (typically roll grooved) connected with a...
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Threaded

A connection in which an internal threaded fitting and an external threaded piece of pipe or...
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