11 Means of Sounding
11.1 General
11.1.1 Application
These requirements apply to the provision of a means of sounding for liquid and void tanks and for normally dry but not easily accessible compartments. The requirements in this Subsection, however, do not apply to sounding arrangements of liquid cargoes, such as crude oil, liquefied gases, chemicals, etc., for which specific requirements of provided in Part 5. The means of sounding covered in this Subsection include sounding pipes and gauge glasses. For level-indicating devices fitted to tanks containing flammable liquid, such as fuel oil, see 4-6-4/13.5.6(b). Remote tank level indicating systems are to be submitted for consideration in each case.
11.1.2 Basic Requirements
All tanks, cofferdams, void spaces and normally dry compartments, such as cargo holds, which are not easily accessible, and which have the possibility of water accumulation (e.g., adjacent to sea, pipe passing through), are to be provided with a means of determining the level of liquid present. In general, this means is to be a sounding pipe. A gauge glass, level indicating device, remote-gauging system, etc. may also be accepted as a means of sounding.