Section 041-14-4 - Registration NumbersA.Display; Not Transferable. The assigned State of Maine registration number must appear on each pressure vessel at all times. The registration number assigned to a pressure vessel may not be transferred to another pressure vessel.B.Registration Number. The Inspector must place the assigned State of Maine registration number, preceded by the letters "PV," on a self-locking metal tag issued by the Board and must affix the tag in the vicinity of the manufacturer's name plate.C.Group of Pressure Vessels. For purposes of assignment of a registration number, the Board may consider a group of pressure vessels, such as the rolls of a paper machine or a dryer operating as a single machine or unit, to be one pressure vessel. In that event, the group of pressure vessels must be assigned a single master registration number and the individual pressure vessels must be assigned separate registration numbers related to the master registration number. The owner must pay a certificate fee for only a single pressure vessel.02-041 C.M.R. ch. 14, § 4