Fluid tubes

Fluid tubes are designed for conveying the tubes having the fluid properties of the medium.

Fluid tubes

Fluid pipes are hollow cross section, no welded joint from start to finish. Steel tube with a hollow cross-section, for a large number of pipe conveying fluid pipeline to transport oil, natural gas, coal gas, water and some solid materials.

Compared to solid steel such as steel pipes and round steel in flexural torsional strength the same, lighter, is an economic section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive transmission, bike frame and steel used in construction scaffolding.

Having the nature of the fluid medium, in addition to the liquid medium such as water, oil, solution, etc., cement, grain, coal and other solid media, under certain conditions, can also be mobile.

Fluid tubes made of steel, copper, titanium and other non-ferrous metals manufacturing, and even can be manufactured from plastic and other non-metallic materials. Must be fluid tube having a hollow cross-section, but can also be square, triangular or any other shape, and some of the equipment subject to conditions, it must be used a rectangular tube, but most or using round tube. Tube in all geometric cross-section having a minimum perimeter / area ratio of the maximum internal cross-section, i.e. under conditions using the same amount of materials can be obtained.

Steel pipe due to its low cost, high strength, in the modern society, the fluid delivery to be widely applied. Steel pipe into seamless steel pipe and welded pipe two categories according to their production process, which welded pipe is divided into ERW (ERW), spiral welded pipe (SSAW), submerged arc welded pipe (UOE). In the past, the fluid tubes to the traditional use of seamless steel pipe, materials science, the molding process, the development and progress of the crew and equipment, welded pipe has been a great development.

Welded pipe has the advantages of better than seamless pipe wall thickness uniformity, high precision, low energy consumption, high production efficiency, demanding oil and gas pipeline (API standard), almost one hundred percent use of seamless pipe, today in the United States, Japan, Europe and the developed countries, more than 95% have been welded pipe replaced.

With ordinary steel pipe, the welded pipe for transporting fluid tubes have different requirements:



Tech & Service of Seamless pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.

How to make seamless pipe(seamless pipe process)?
Hot Piercing Workshop
Piercing process
The cross roll piercing and pilger rolling process in the size range from approx. 250 to 660 mm outside diameter.
Precision cold drawn steel tube production process
Pipe weld cracks
often follow different mechanisms can be divided into two types of thermal cracking and cold cracking.
How to calculate a steel pipe and tube theoretic weight
Calculate a steel pipe?
Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe.
Pipe beveling
Pipe beveling is the process where an angle is formed between the edge of the end of a pipe or tube and a plane perpendicular to the surface.
Steel pipe cutting machine
Pipe cutting
Cutting tools have a grinding wheel piece cutting machine (also known as toothless saw), hand saw, cutter and other hand tools.
How to calculate a steel pipe and tube theoretic weight
Packing the steel pipes
There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method.
Condition on delivery:

It refers to the state of final plastic deformation or final heat treatment of the delivered product. The hot-rolled or cold drawn (rolled) state or manufacturing state generally delivered without heat treatment; the heat-treated state after heat treatment delivery, or the normalizing, tempering, solid solution, annealing according to the type of heat treatment status.

Delivery status Abbreviation Description

Cold-finished/hard
(cold-finished as-drawn)

BK No heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft
(lightly cold-worked)
BKW After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
Annealed GBK After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
Normalized NBK The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.

Delivery according to actual weight or delivery according to theoretical weight

 


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