Linepipe is a sort of steel pipe made use of for petroleum, natural gas, oil, and also water transportation. Most of the steel pipes are utilized in regions with serious natural conditions, such as polar areas, ice fields, deserts as well as oceans, etc. The lines are lengthy and also hard to maintain, which asked for rigorous quality demands and specifications. The pipeline steel consists of smooth as well as bonded steel tubes according to its production approaches as well as made from high stamina carbon steel., which can be laid in cold, high-sulfur locations or under the sea.

The Advantages Of Steel Linepipe

This linepipe typically has good mechanical homes such as wall density, high strength, high toughness as well as put on resistance, but additionally must be large size, excellent weldability, low-temperature resistance, corrosion resistance (CARBON DIOXIDE), seawater resistance and also HIC, SSCC performance.

High strength

Steel pipeline not only calls for high tensile toughness as well as return stamina but also gives a distorting ratio of 0.85 ~ 0.93.

High influence toughness

High influence strength protects against fracturing.

Low ductile-brittle change temperature

Severe regional and also climatic problems require the pipe steel to have a sufficiently reduced ductile as well as fragile shift temperature level. The shear location of DWTT (decline hammer tear examination) has actually become the main control index to avoid the fragile failing of the pipeline, and also it is normally required that the fracture shear area of the example need to be ≥ 85% at the lowest operating temperature level.

Excellent hydrogen-induced cracking (HIC) and also sulfide stress and anxiety deterioration splitting (SSCC) resistance

Excellent welding efficiency

The Requirements For Steel Pipe

Currently, the primary technical requirements for oil and also gas conveying steel linepipes are API SPECIFICATION 5L, DNV-OS-F101, ISO 3183 and also GB/T 9711, etc

. API 5L is an extensively used spec established by the primary petroleum institute, which is just for steel pipe products, leaving out the style, choice or setup of pipelines.

DNV-OS-F101 (subsea pipe system) is a spec created by Norske veritas specifically for subsea pipes. It covers a vast array of materials, including pipeline style, products, manufacturing, installment, screening, operation, maintenance, etc., which is typically more stringent than API 5L.

ISO 3183 is the worldwide organization for standardization established on the oil and also gas transport steel pipe distribution problems, the standard is detailed, thorough however does not involve the pipe design, installment, and so on