Design of Stainless Steel Pipe under Concrete Tank 1

[vincentpa]

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.

 

[Robertmet]

What type of stainless ? What will it lay in ? 300 series stainless is usually not used buried because it's prone to pitting corrosion .

 

[vincentpa]

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.

 

[JedClampett]

I would encase the pipe, no matter what the material is, and not worry about the structural design.