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I write my G2 this Saturday. In the few practice testes I have bought, there are similar questions with pressures  and the answers appear to be wrong. 14.7psia=0psig, this is fact. But a couple questions answer  with psia not psig. If on the test it's asked the max propane pressure in an industrial building would be 20psig not psia, right?

The gas code piping tables refer to PSIG not PSIA.  Take a look at the attachment below.  Table 5.1 of the B149.1-10 Gas Code is in PSIG (kPa).

Here is Question 104 from the G2 practice exam.  The correct answer would be C.

Quote(104) A pressure reading of 14.7 PSIA is equivalent to?
A.    2.35 in wc
B.    14 in wc
C.    0 psig
D.    10 psi

That's not to say the exam won't try to trick you.  Just subtract 14.7 from PSIA to get PSIG.

Good luck on the exam!

OK, thanks for the assurance.