301 Spring Street
East Jordan, MI 49727
800.626.4653
MADE IN THE USA
Light, heavy, and extra heavy duty designations are assigned to EJIW castings to reflect load ratings. The most widely accepted criteria for highway traffic loading comes from "Standard Specifications for Highway Bridges" published by AASHTO (American Association of State Highway and Transportation Officials). Do not use light duty castings for a heavy duty application! Involve EJIW personnel if you are in doubt of your design requirements.
Non-Traffic: Castings designated as non-traffic are intended for use in areas that are not subject to vehicle traffic. EJIW products designated as non-traffic include decorative items such as tree grates, or designs with raised surface areas such as "beehive" pipe and ditch grates. Generally nothing over 2,500 pounds should be placed on these items. Duty rating is 0 — 2,500 pounds.
Light Duty: Light duty castings are able to withstand some vehicular loading, but are not designed to accept roadway traffic. Items can accept loading from 2,500 — 16,000 pounds. These products may be subject to occasional traffic from process maintenance, garbage pick-up, mowers, etc. Meter boxes are an example of this type of product. Meter boxes are normally placed in grassy areas, but can withstand occasional traffic from mowers and service vehicles.
Medium Duty: EJIW castings designated as medium duty accept loading from 16,000 — 40,000 pounds. These castings can accept standard traffic loading, and are in conformance with H-20/HS-20 (wheel load of 16,000 pounds on a tire contact area of 8" X 20") or Federal Specification RR-F-621D (25,000 pounds on a 9" X 9" load contact area). Castings with medium duty designation have been safely used in traffic areas for years, but lack the safety requirements of AASHTO M306.
Heavy Duty: EJIW designed castings must meet the requirements of AASHTO M306 to be classified as heavy duty. AASHTO M306 requires that castings bear a minimum of 40,000 pounds on a 9" X 9" area. This represents a 2.5 safety factor over the 16,000 pound requirement of H20 and HS20. This load designation is appropriate for general traffic applications. Loading criteria is 40,000 — 100,000 pounds.
Extra Heavy Duty: Casting is able to accept loading from 100,000 — 200,000. This meets the design loading associated with the FAA wheel loading.
Extra Heavy Duty Airport: Casting is able to accept loading from 200,000 pounds and up. This includes an additional safety factor over FAA design loading.
