This document is the specification for Duraslot XL. Scope, pipe requirements, fittings, installation and standard dimension chart detailed.

This specification describes 6- through 36-inch (150 to 900 mm) ADS Duraslot XL pipe for use in surface drain and conveyance applications. Duraslot XL pipe shall have a smooth interior and annular exterior corrugations with an aluminum slot grate frame mounted longitudinally along the length of the pipe to accept the grate, while maintaining the original pipe diameter.

The aluminum slot grate frame shall be manufactured from 0.063” (1.6 mm) tempered commercial aluminum meeting the requirements of ASTM B209, consisting of two parallel plates separated by spacers spanning the slot width. The aluminum slot grate frame shall be coated with a primer to protect the aluminum when installed in concrete.

Grates shall be made of ductile iron with a 4.81-inch (122 mm) width and 19.69-inch (500 mm) length. The grate pattern, open area and load rating will vary based on the chosen design. The flange at the bottom of the aluminum slot grate frame shall be riveted to the pipe with a minimum of two rivets per linear foot.

Duraslot XL fittings shall be modified from fittings which conform to AASHTO M252, AASHTO M294 or ASTM F2306.

Installation shall be in accordance with ADS recommended installation instructions.

A detail for the Duraslot XL shows the ductile iron grate, spacer, aluminum slot frame, connecting flange and HDPE dual wall N12 pipe.

A table showing the dimensions for nominal pipe diameter is provided.

Notes state that custom slot heights and production of custom slots will require approval by the Duraslot Project Engineer. Other grate material options available upon request.

Details showing the Duraslot length and O/R/S/H/W dimensions provided.