甲醇合成塔中Tan. to Tan. Length是什么意思? t.l to t.l 和 tan. to tan. length 是同一个意思。 tan-tan is an abreviation for the length of a vessel from tangent line to tangent line. the tangent line is the point where the tank head is welded to the tank cylinder. tangent line: refers to the point of contact (tangency) between the cylinder and the knuckle portion of the vessel head. the distance from the tangent line on one head to the tangent line on the opposite head is known as the straight side, or tangent-to-tangent (t/t). http:///glossary.php the depth of tank heads will vary with the diameter of the head. you would have to visit a head manufacturer's catalog to determine the height of a head. there are also different types of heads: dished, spherical, etc.查看更多