When you can't see the pipework in a gas installation, use worst-case assumptions for safety. The new IGEM/UP/1B chart gives you broad tolerance ranges, so you don't need exact volume calculations. If you're uncertain, pick the next higher range.
How sensitive is it? Like, if you get the volume slightly off, does it, does it have a big impact?
Approximation should be okay. No one's going to be perfect with their installation volume calculations, but the ranges in the, in the new chart, the permissible limits chart, that tells us what we can accept as a drop in the tolerance test, the ranges are quite large, so you should be able to get it within one of them. And if any doubt, you just, you step to the next one up and work off of that. So that is what I will be doing because there isn't a straightforward answer. Gas Safe aren't going to have a straightforward answer because if you can't see it, you've got to go with worst case, in my opinion.
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