BIG DIAMETER ERW PIPES CONFIRM TO IS 3589

(a) Thickness
-1	Butt welded Light tubes	+Not limited- 8 percent
		+ Not Limited - 10 percent
-2	Seamless Tubes	+Not Limited- 12.5 percent

(b) Weight :
-1	Single tube (light series)	+10 percent- 8 percent
-2	Single tube(medium & heavy Series)	+10 percent

Tolerance on Thickness and Weight : as per IS 1239 The following manufacturing tolerance shall be permitted on the tubes and sockets.			MAXIMUM PERMISSIBLE PRESSURE AND TEMPERATE FOR TUBES WITH STEEL COUPLINGS OR SCREWED AND SOCKETED JOINTS
	Nominal Bore mm	Maximum Permissible Pressure N/mm2	Nominal Bore mm	Kg./cm2	Maximum PermissibleTempreature 0C
	Up to and Including 25 mm	1.2			12.24	260
	Over 25 mm up to and Including 40 mm	1.03			10.5	260
	Over 40 mm up to and Including 80 mm	0.86			8.77	260
	Over 80 mm up to and Including 100 mm	0.69			7.04	260
		0.83			8.77	177
	Over 100 mm up to and Including 125 mm	0.69			7.04	171
	Over 125 mm up to and Including 150 mm	0.5			5.1	160
	For tubes fitted with appropriate flanges of suitably butt welded together,the Max, permissible pressure shall be 21.00 Kg/cm2 and Max. permissible temp. 260 C