U.S. FOUNDRY & MANUFACTURING CORPORATION
GENERAL INFORMATION
2
GENERAL INFORMATION
STANDARD SPECIFICATIONS MUNICIPAL CONSTRUCTION CASTINGS
MATERIAL:
Grey Iron castings shall conform to ASTM A48 Class 35B, AASHTO M105, and/or
AASHTO-M306 unless otherwise specified.
MANUFACTURING:
Castings shall be manufactured true to pattern and component parts shall fit
together in a satisfactory manner. They shall be smooth and well cleaned by
shot-blasting. Circular medium and heavy duty manhole rings, covers and grates
shall be furnished with machined horizontal bearing surfaces unless otherwise
specified. All square and rectangular units shall be furnished with an as-cast
bearing surface.
TOLERANCES:
As cast dimensions may vary by ± 1/16 inch per foot in critical areas relating to fit,
load bearing capacity and drainage openings. Non-critical dimensions may be
modified to facilitate proper casting techniques, performance and value, without
notice. Notwithstanding these tolerances, all rings, covers, frames, grates and curb
hoods of the same nominal size are interchangeable.
WEIGHTS:
Although casting weights are not illustrated in this catalog, they are a significant
part of any municipal or technical specification and as such will be strictly adhered
to. Notwithstanding, casting weights shall be within ± 5% of the specified weight
and/or as shown on customer drawing.
PAINT:
Castings are supplied unpainted as a standard, unless specified.
(
See U.S. Foundry’s No Paint Policy on page 6.)
For special paint applications, contact our customer service department.
CAST IRON LOAD RATING
All castings manufactured by U.S. Foundry are proof load tested in accordance with the destructive
testing protocol below, and are assigned one of the following four load rating designations:
•
Non-Traffic:
These castings are intended for areas such as sidewalks, terraces and other areas
not subject to vehicular traffic loads.
•
Medium Duty:
Castings bearing this designation are able to withstand occasional vehicular
loading, but are not intended to receive heavy highway traffic. Applications include driveways,
parking lots, and ramps.
•
Heavy Duty:
These castings are manufactured to withstand highway traffic loads, exceeding
AASHTO H-20/HS-20 specifications (wheel loads of 16,000 pounds with a tire contact area of
10”
x 20”) 25,000 pounds proof load in accordance with CID A-A 60005 or 40,000 pounds proof
load per AASHTO M-306.
•
Extra Heavy Duty:
For traffic applications requiring even greater load bearing capability, or where
increased safety factors are necessary. When castings in this load rating designation are required,
please advise loading conditions including total wheel load, tire contact area and tire pressure.