Fibrelite’s composite manhole covers have successfully passed load testing for both the AASHTO H20 and H25 highway load ratings. In testing performed at Lancaster University, Fibrelite’s 30” and 36” diameter composite covers were tested per the American load testing standards for manhole covers, grates and castings as set forth by the American Association of State Highway and Transportation Officials (AASHTO) M306-04 Standard Specification for Drainage, Sewer, Utility, and Related Castings.
The AASHTO M306-04 test specifications are used to predict how manhole covers, grates, and castings will perform when installed in traffic lanes and where load bearing is a requirement. While the M306-04 specifications are specifically written for gray iron and aluminium castings, Fibrelite’s composite manhole covers and frames have been designed to meet the demanding requirements set forth by the standard. The M306-04 test requirements include 40,000 pound and 50,000 pound proof loading tests, respectively for the H20 and H25 load tests.
The requirements of the test include applying the proof loads to the cover and frame for a 1-minute period. The tested products pass the test if following the application of the load there are no visible cracks to the cover or frame, and there is no permanent deformation or deflection to the top of the cover in excess of 3.2 mm (1/8”).
Fibrelite’s standard duty FL760 (30” diameter) and FL90 (36” diameter) composite covers were subjected to the H20 40,000 pound proof load tests. Both of the standard duty covers successfully passed the test with minimal permanent deformation (less than the 1/8” allowed per the M306-4 standard) and with no visible signs of cracking or damage. In addition, Fibrelite’s heavy duty FL760HD (30” diameter) and FL90HD (36” diameter) composite covers were subjected to the H25 50,000 pound proof load tests. Both of the heavy duty covers also successfully passed the test.
Fibrelite introduced the lightweight composite manhole cover for use at gasoline service stations in the early 1980s and has continued to develop innovative product designs to meet the needs of a changing industry. Fibrelite currently offers the retail petroleum industry’s leading watertight composite covers, the industry’s only composite multiport cover, and a wide range of molded fiberglass secondary containment and enclosures.