... ,LTC,STC;NUE,EUE8)Surface Treatment: Oil-dip, Shot Blasting, Varnish 9)Coupling,Pup-joint and thread protector can be required10)Type ... process: seamless or ERW11)Application: Conveying gas,water,and oil in both the oil and natural industries12)Test equipments: X-ray detector,ultrasonic wave ...