Minimum Bend Radius of Plastic Pipe

[sloquick]

I'm using Polyethylene tubing as innerduct in a gas pipe. The internal pressure of innerduct is 0 psig. Would the minimum bend radius specified for innerduct assumed to be used to contain internal pressure still apply, or could a smaller bend radius be used without compromising integrity? Plastic pipe is often coiled with a bend radius less than that specified for permanent installation.