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Technical Services
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B-136
Metal Framing & Cable Tray — Superstrut
®
Metal Framing System
Pipe Straps, Conduit Clamps and Hangers
GoldGalv
®
Outperforms Copper Plated
In a test conforming to ASTM G-87-84, also known as the Kesternich Test,
Superstrut’s GoldGalv
®
electrogalvanized zinc trivalent chromium finish
achieved superior corrosion resistance in comparison to copper plated.
Performed and certified by an independent testing laboratory, the stringent
Kesternich test is equivalent to an acid rain environment. The test procedure
exposes subject material to condensed moisture containing harsh sulfur
dioxide (S02) which accelerates the aging process. During the series of test
time cycles, the material is thoroughly inspected for signs and progression
of damaging red rust.
The first test series conducted included various light-duty adjustable clevis
hangers assembled to copper tubing. The GoldGalv
®
finish exhibited five
times the red rust resistance as compared to copper plated.
The second test series was performed on various O.D. pipe straps attached
to copper tubing and continuous slot channel. GoldGalv
®
achieved greater
red dust resistance by seven times over copper plating.
Once tests were completed, all copper tubes were split open and inspected
for signs of electrolysis. The copper tubes showed minimal deterioration
as a result of the test and no indication of electrolysis occurrence when
attached to material with GoldGalv
®
finish.
GoldGalv
®
hardware finish is standard for all Superstrut
®
products. This is a multi-process finish
of electro-plated zinc, followed by gold-colorized trivalent chromium to give excellent corrosion
resistance and a superior paint base. See pages B-106–B-107 for a complete description of the
GoldGalv
®
hardware finish. GoldGalv
®
hardware will be furnished if no other finish is specified.
Materials
Most products are manufactured from hot-rolled carbon steel bars or hot-rolled strip steel.
Pipe rollers are cast iron. Products which are copper plated carry the letter “T” in the prefix.
Design Loads
Where design loads are indicated, they provide for a safety factor of 3 in conformance
with the “AMERICAN STANDARD CODE FOR PRESSURE PIPING.”
Hanger Design
Pipe hangers are of advanced design and afford a new and better way of ordinary use.
Standard Dimensions
The following, except where noted, apply to all beam clamp fittings.
Hole Size:
9
⁄16" diameter
Material: 1
5
⁄8" wide
Material:
1
⁄4" thick
Excellent Corrosion Resistance
and a Superior Paint Base
ASTM G-87-84 Corrosion Test Results
FINISH
INITIAL
RED RUST
50%
RED RUST
100%
RED RUST
Test Series I: Light-Duty Adjustable Clevis Hanger
GoldGalv
®
120 hours 216 hours *Never obtained
Copper Plated 24 hours 48 hours 72 hours
Test Series II: O.D. Pipe Straps
GoldGalv
®
168 hours 192 hours 240 hours
Copper plated 24 hours 48 hours 168 hours
*Test series ended after 360 hours.
Standard Finish – GoldGalv
®
, unless otherwise stated.