How to Calculate the Foundation Support of the Pipe

Not enough information has been provided to accurately answer your vague question.

You need to provide more details, such as: the calculated gravity load (force) acting on the foundation?; the type of foundation (presume to be concrete?; piles with pile cap)?; is the pipeline elevated above ground?; year-round weather conditions?; is it in an Earthquake prone region and design earthquake loadings? ; type of conveyed liquids and volumetric flow? any identified water hammer conditions?; identified impact factors of any kind?; and last, but not least the underlying soil conditions? Has any Geotechnical evaluations and testing been conducted along the ENTIRE route of your pipeline?

That should give you a start to providing us with valuable information that we need to successfully answer your question.

Good luck!