1789 E. Riou Jrnl. 25 Dec. in (1990) 68 The water was likewise over the orlop beams in the bread-room.
1869 E. J. Reed xix. 423 Vessels over 24 feet in depth are required by Lloyd's to have orlop beams on every sixth frame.
1927 Oct. 643/1 And the ballast pump, situated under the orlop beam and below our quarters, was like a tocsin in our ears.