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I have sections of the wet return from my boiler that are below grade and have corroded. I am having them replaced and I have a few questions.

1) I have excavated the area in preparation for the plumber and plan on repairing the floor once the plumber is done. The existing pipe was buried in dirt and covered in a few inches of concrete. Now that I have a chance to do the job right, I am wondering what the best way of covering the new pipe will be. Should it be wrapped in some way before covering it to avoid corrosion? Should I cover it with dirt or gravel or a combination of both prior to laying the concrete over it? Any tips on doing this job right would be appreciated.

2) There is currently no way to flush the returns. Should I ask the plumber to install some sort of flush valve before it goes underground? Again, I just want to make sure that the job is done right so I don’t have to revisit it.

Thanks for your help…