A vessel section for a metal containment vessel, the vessel section comprising a body defining a monolithic trough-shaped part of refractory material and having a metal-contacting surface formed therein, and having a transverse groove at one end of the body, the transverse groove extending across at least the bottom of the trough and having a metal mesh rope pre-positioned in the transverse groove leaving room in the transverse groove for an overlying coating of a moldable refractory material, wherein when vessel sections are placed end to end, the transverse groove is within a gap between the adjacent vessel sections and the metal mesh rope in the transverse groove prevents the moldable refractory material from penetrating further in the gap than a lower surface of the transverse groove.