U.S. FOUNDRY & MANUFACTURING CORPORATION
GENERAL INFORMATION
4
GENERAL INFORMATION
CONT.
*
Standard Specifications for Highway Bridges, 17th Edition (2002)
For special load requirements consult our sales or customer service representatives.
SPECIFICATIONS FOR STEEL PRODUCTS
MATERIAL:
U.S. Foundry steel frame, cover and grate products are manufactured with ASTM
A36 and/or A-572 structural steel. Riveted grates are manufactured with ASTM
A36 structural steel and/or A569 commercial quality sheet and strip.
MANUFACTURING:
Our steel products are manufactured by highly skilled craftsmen using state of the
art equipment and AWS welding procedures.
TOLERANCES:
The tolerance for steel riveted grates is ± 3/16 inch. When the width of a riveted
grate is over 5 feet-0 inches, the width tolerance is ± 1/4 inch. All other steel
fabricated products are to industry standards or ± 1/16 inch, whichever is more
stringent.
WEIGHT:
Steel product weights are approximate and shall be ± 5% of the specified weight
and/or as shown on customer drawing.
FINISH:
Steel frames, covers and grates can be finished to meet your special requirement.
Our standard finish is one coat of water-based black paint. The most common
optional finish is hot-dipped galvanized. (Note: unless otherwise specified,
galvanized finishes are standard for airport products and direct traffic & parking
lot access hatches.)
LOAD DESIGNATIONS
CLASSIFICATION
H-20
PEDESTRIAN
(
NON H-20 TRAFFIC)
280
P.S.I. (LBS. PER SQ INCH)
(
For severe loads such as airports and seaports)
SCULPTURED COVERS
U.S. Foundry provides custom logo covers for many municipalities in a number of cover designs.
Many of these municipalities implementing “branding” programs to enhance the look, awareness and
pride of their communities, choose custom logo covers that feature the slogan, logo, mascot or popular
characteristic of the city, county, state or local university. Covers can be made to fit any existing ring, or
can be adapted to any particular standard cover. You can see a number of these unique designs
throughout our “Cover Types” section, pages M-7 thru M-14.
Please contact us for more information or to have a particular item designed.
SPECIAL APPLICATIONS
WATER RESISTANT / WATERTIGHT APPLICATIONS:
Surface water infiltration through sanitary manholes continues to be a significant concern. We address
these concerns with several self sealing applications, (O-Ring, “T” gasket and SSG) as well as bolted
watertight applications. These options are shown in complete detail on pages M-3 thru M-4.
DEFINITION
AASHTO H-20* wheel loads (16,000 lbs distributed over a
10”
x 20” area with 30% impact factor).
Pedestrian loading of all our standard steel products equals or
exceeds 300 lbs per sq ft. (Not to be used for H-20 conditions.)
Load criteria are based on a linear reduction from 280 p.s.i.
for a 2 foot span to 80 p.s.i. for a 10 foot span (ref: FAA AC
150/5320-6
c).