design of stainless steel pipe under concrete tank

huangyhg

design of stainless steel pipe under concrete tank
the process guys have located a 6" and 10" drain under our 46'x46'x24' concrete tanks.  the contractor wants to use stainless steel pipe because he has it in stock.  i have design guides for ductile iron pipe but not stainless steel pipe.  does anyone know of a design guide for buried stainless steel pipe subject to vertical pressure?  how far would you usually bury a pipe under a tank?  what type of bedding would you use for the tank?  we specify 24" of cover with type 5 bedding.  do you think that is enough?  the tank is a wastewater treatment tank in pa.
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what type of stainless ? what will it lay in ? 300 series stainless is usually not used buried because it's prone to pitting corrosion .
don't know the type of stainless pipe. the bedding will be either type 5 - pipe buried in compacted course aggregate (aashto #57) or type 4 - pipe lays in sand to 1/8 diameter then compacted backfill around pipe.
i would encase the pipe, no matter what the material is, and not worry about the structural design.