U.S. FOUNDRY & MANUFACTURING CORPORATION
GENERAL INFORMATION
CONT.
For special load requirements consult our sales or customer service representatives.
Designation
Load Application
Minimum Proof Load Test
Reference Specification
Non-Traffic
Sidewalks, terraces
1000
pounds
–
Medium Duty Parking lots, driveways
18,000
pounds
–
Heavy Duty
H-20 Traffic
25,000
pounds or
CID A-A 60005 or
40,000
pounds
AASHTO M-306
Extra Heavy Duty Concentrated loads
–
–
DESTRUCTIVE TESTING PROTOCOL
Proof load test is the recommended method for determining a casting’s load performance. This testing
procedure is detailed in Federal Specification CID A-A 60005 and AASHTO M-306. The fundamental
aspects of the test are:
•
A specified load is applied over a 9" x 9" contact area at the center of the casting.
•
The load is held for a period of one (1) minute.
•
The cover, grating or frame is inspected for cracks or permanent deformation.
•
Any crack or detrimental permanent deformation will cause the castings to be rejected.
•
Most tests are performed with loads greater than those specified, even to destruction.
REFERENCED SPECIFICATIONS
There are several published specifications that are available to assist designers in specifying iron
castings. It is the responsibility of the designer to determine if one or all of these specifications are
appropriate for a given application. These specifications are referenced as follows:
•
Federal Specification CID A-A 60005 - Frames, covers, gratings, steps, sump and catch basin
manholes
•
ASTM-A-48 - Standard Specification for Gray Iron Castings
•
AASHTO-M-105 - Standard Specification for Gray iron Castings
•
AASHTO-M-306 - Standard Specification for Drainage Structure Castings
*
ADA – Americans with Disabilities Act.
*
FAA AC 150/5320-6c – Federal Aviation Administration
3
GENERAL INFORMATION