Is it common to have API 5L B (without galvanised) for the instrument piping material?

Based on my previous experience it should be pre-galvanised, however on my current project it is specified as API 5L B without galvanised?

If the instrument air is wet, you may have other problems besides corrosion. Your instruments may also freeze.

Most places that I know of use carbon steel without galvanising. I don't know of any sites with all stainless steel instrument air piping system. Stainless steel pipes would cost a lot more. The welding would also be different I would think - although I am not familiar with stainless steel welding.

EdStainless, a quick question to you. What is the instrument air receiver/volume tank made of? If it is carbon steel, does that mean it has a liner?filter

The first place that I saw it was in air lines for paint spray booths, which must be kept very clean.
Since then I have seen it in drug plants, breweries, and even is some manufacturing plants that have a lot of air driven equipment.  They say that it significantly reduces wear and failure of air cylinders and controls.

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