Hermuler CNC
Internal Welding Machine
Products Features
The ASTM A134 EFW steel pipe refers to electric-fusion-(arc)welded straight seam or spiral seam steel pipe NPS 16 and over in diameter, with wall thicknesses up to 3/4″ (19.00 mm), inclusive. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of ASTM A134/ A134M. EFW steel pipes manufactured in accordance with ASTM A134 are usually large-diameter pipes. They are generally provided for low- or intermediate-pressure piping applications.
The electric-fusion welding is also known as electro-fusion welding. It is abbreviated as EFW. If the finished pipe has a straight seam, it is called straight-seam EFW pipe or longitudinally EFW pipe. If the finished pipe has a spiral seam, it is called spiral-welded EFW pipe.
Hermuler CNC
Internal Welding Machine
Thickness & weight: the wall thickness and weight for EFW steel pipe conforming to ASTM A134 shall be governed by the requirements of the specifications to which the steel was ordered.
Circumference: The outside circumference of the pipe shall not vary more than 60.5% from the nominal outside circumference.
Straightness: Finished pipe shall be commercially straight.
Ovality (out-of-roundness): The difference between major and minor outside diameter shall not exceed 1%.
Lengths: The lengths of pipes shall be as specified on the order with a tolerance of 0.5 inch (13 mm).
Bevel ends: The pipe ends shall be beveled in accordance with ASME B16.25.
Inspection and Testing
All testing and inspection shall be performed prior to shipment. The inspection and testing for ASTM A134 EFW steel pipes include tensile tests and chemical analysis on the steel plates. Ultrasonic tests shall be conducted on the steel plates before welding to ensure the soundness of raw material. X-ray inspection shall be conducted during/after the welding process. Tension tests shall be performed on the weld-test specimens. Its tensile strength shall be no less than 95% of the specified minimum strength of the steel. Each length of pipe shall be tested to a certain hydrostatic pressure for at least 5 seconds.