Answer :

We are given a multiple‐choice question regarding the standard supply line pressure for liquid petroleum. The four options are:

$$
\begin{array}{ll}
\text{A. } 3\frac{1}{2} \text{ inches wc} & \text{(inches water column)} \\
\text{B. } 11 \text{ inches wc} & \\
\text{C. } 30 \text{ psig} & \\
\text{D. } 22 \text{ psig} &
\end{array}
$$

The standard pressure is recognized to be measured as the height of a water column, and through evaluation of the recognized industry standard, it is determined that the correct value is:

$$
11 \text{ inches wc}.
$$

Thus, the correct answer is option B.

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