求翻译：筒体环形对接焊缝及其与连接法兰焊缝应100%UT。筒体纵向对接焊缝要求接50%UT，其质量应达到焊接质量等级1级，筒体的直线度误差不大于2mm.是什么意思？

Circular cylinder with flange butt welds and welds should be 100% UT. Requirements of longitudinal butt weld tube connected 50% UT, its quality should reach a level of quality of welding, cylinder straightness error of less than 2mm.

Cylinder ring of the weld and its related UT connecting flange weld should be 100 per cent. Cylinder vertical butt welds UT request received 50 per cent, its quality should reach welding quality and grade level 1, cylinder the camber error be less than 2mm .

The tube body ring-like butt welding seam and with the attachment flange welded joint should 100%UT.The tube body longitudinal butt welding seam requests to meet 50%UT, its quality should achieve the welding quality rank 1 level, the tube body straight dimension error is not bigger than 2mm.

Flange cylinder circular butt welds and connections welds should be 100%UT. Cylinder longitudinal butt welds require 50%UT, its quality should meet welding quality grade 1 class, tube straightness is not more than 2mm.

Tube butt weld and connection flanges weld ring 100%UT. Cylinder longitudinal butt welds require 50%UT, its quality should meet welding quality grade 1 class, tube straightness is not more than 2mm.