Electric-welded pipe has one longitudinal seam formed by electric-resistance or electric-induction welding without the addition of filler metal. The edges to be welded are pressed together mechanically, and the heat for welding is generated by the resistance to flow of electric current. The weld seam of electric welded pipe is heat-treated after welding to a minimum temperature of 1,000°F or processed so that no untempered martensite remains. See API Spec. 5CT for exceptions.
API Specification 5CT latest edition at time of manufacture (PSL-1, PSL-2, PSL, 3)
ISO 11960:2004, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells
Outside Diameter: 1.660″ – 30″
H40, J55, K55, N80,N80Q, L80, C90, C95, T95, P110, Q125,SS95,SS110, 9%CR, 13%CR
STC (short round thread casing)
LTC (long round thread casing)
BTC (buttress thread casing)
XL (extreme-line casing)
NUE (non-upset tubing)
EUE (external upset tubing)
IJ (integral joint tubing)
And almost any premium & gas tight connection
Range 1, Range 2 & Range 3
Application:Tube for conveying gas, water, and oil in both and natural gas industries etc.
Casing:Casing is a large diameter pipe that serves as the structural retainer for the walls of oil and gas
wells, or well bore.It is inserted into a well bore and cemented in place to protect both subsurface
formations and the wellbore from collapsing and to allow drilling fluid to circulate and extraction to take
place. Steel Casing Pipes have smooth wall & minimum yield strength of 35,000 psi.
Tubing: Tubing is pipe used for the transportation of crude oil and natural gas from an oil or gas layer to
the surface after drilling is complete. It is made to withstand the pressure generated from the extraction
process. Tubing is manufactured in the same way as casing, except that an additional process known as
“upsetting” is applied to thicken the pipes.