The Guidebook doesn't include complicated graphs; it uses tables for
speed. There are several graphs that were too complex to convert into
table format that you should bring to the exam.
One (naturally) is a z-chart. I use the one in TS8 (or TS1). Another is the equilibrium water vapor content for natural gas (I use Fig 5.7 in HS3-199). You should own and bring (at a minimum) TS1 and HS3, so just use those charts. Practice using them until you are fast.
A typical natural gas problem? Water vapor (lbs) to be removed from a saturated gas (MMscf).
Just go to the chart at any temperature and pressure to get saturated lbs water/ MM gas (at say 100 deg F & 1,000 psig you get about 60 lbm water). If given the minimum water allowed for sales (say 10 lbs/MM) you must thus remove 50 lbm for each 1 MM sold (for my example). Simple.
Always glance over your answer choices before finding "exact" chart numbers. Work fast and estimate. Remember, it's all about speed. This is why tables are much faster; just scan down the table and make estimates between numbers.
Hi David. I'm currently studying for the 2021 exam in a couple of weeks (October 20th, to be exact) and can't seem to find the applicable equation(s) in the SPE RG. Would you be able to point me in the right direction for this one? Thank you for the help.
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