| You are preparing to undertake the repiping of a water column for an auxiliary fire-tube boiler exceeding a 15 psig operating pressure and is piped similarly to the arrangement shown in the illustration. According to Coast Guard Regulations (46 CFR, Part 52), which of the following statements is true? |
| A) It is permissible to locate water column piping in the uptake, smoke box, or boiler casing. |
| B) The minimum size of the piping connecting the water column to the boiler is to be 1.5 inches (3.8 cm). |
| C) The various fittings used must be of cast iron construction. |
| D) The shut off valves on the boiler must be locked, or sealed open. |
