PLS1 & PLS2 line pipe manufacture

PIC-(PLS1 & PLS2 line pipe manufacture)

Type of steel tube	Steel tube size mm		Deviation
Type of steel tube	Steel tube size mm		Ordinary grade	Senior
Hot rolling (extrusion, expansion) tube	Outside diameterD	All	+1%（Minimum+0.50）	-
Hot rolling (extrusion, expansion) tube	Wall thicknessS	All	+15%（Minimum+0.45） -12.5%（Minimum-0.40）	-
Cold drawing (rolling) tube	Outside diameterD	6~10	+0.20	+0.15
		>10~30	+0.40	+0.20
		>30~50	+0.45	+0.30
		>50	+1%	+0.8%
	Wall thicknessS	≤1	+0.15	+0.12
		>1~3	+15% -10%	+12.5% -10%
		>3	+12.5% -10%	+10%
Note: the outer diameter is not less than 351mm of the thermal expansion tube, the wall thickness allows the deviation of +18%