Stainless steel pipes for oil cracking

Description

Sunny steel has Stainless steel pipes for oil cracking inventory to fulfill your project’s needs, buy Stainless steel pipes for oil cracking at best price & fast delivery.

The material of the stainless steel round bar is from Jiuli and Baosteel China, we control the quality from the very start.

Typically uses types 304, 316, 405, and 410. 304 is excellent between 260-399C (500-750F) while 400-series stainless steels offer resistance at higher ranges, up to 343-371C (650-700F.) 304 also provides excellent naphthenic acid corrosion resistance.

The following are some of the most common corrosive compounds encountered in the various processes employed across the oil and gas industry.

• Sulphur: Present in raw crude, sulphur combines with other elements to form sulphides, sulphuric acids, polythionic acids, and other aggressive compounds. Sulphur can also cause sulphidation of metals at high temperatures.
• Naphthenic Acid: A group of organic acids typically found in Western and Mid-East US crude oils.
• Polythionic Acid: Typically created while equipment is not in operation, these acids are the result of sulphides, moisture, and oxygen interacting.
• Chlorides: Often found in catalysts, cooling waters, and crude oil, salts can increase corrosion resistance. Examples of chlorides include magnesium chloride and calcium chloride.
• Carbon Dioxide: A byproduct of hydrogen plants and catalytic cracking processes, carbon dioxide can create carbonic acid when combined with moisture.
• Ammonia: Often the start of forming other corrosive substances — such as ammonium chloride — ammonia is a common result of hydrogen interacting with the nitrogen in feedstocks.
• Cyanides: Responsible for increasing corrosion rates, cyanides often form during the cracking process of feedstocks high in nitrogen.
• Hydrogen Chloride: The result of hydrolysis of magnesium chloride and calcium chloride, hydrogen chloride is found in many vapour streams. Once condensed, it converts to hydrochloric acid — a highly aggressive corrosion agent.
• Sulphuric Acid: Formed when sulphur trioxide, water, and oxygen combine, this aggressive compound also serves as a process catalyst in alkylation plants.
• Hydrogen: While not directly corrosive, hydrogen is a factor in steel embrittlement and interacts readily with other compounds to create corrosive agents.
• Phenols: Often encountered in processes involving sour water strippers.
• Oxygen: Like hydrogen, oxygen is not a direct threat. In fact, oxygen is a critical component in refreshing stainless steel’s passivation layer. However, it’s also used in a number of processes that can cause oxidation or scaling.
• Carbon: Also not directly corrosive. However, can lead to carburization at higher temperatures, causing steel embrittlement and reducing corrosion resistance allowing other corrosive compounds to initiate attacks.

This puts stainless steel in a position that few other metals can match. While carbon steel is suitable for some low-temperature, -pressure, or -corrosion situations, the variety of stainless steel alloys available ensures there is an option to provide protection against even the most corrosive oil and gas refinement processes.

We polished three times to make sure the surface is perfect bright and smooth, and without any deficiency in quality.

We have precision equipment to test according to the standard required and PMI test to check the material before delivery.

Stainless steel seamless pipe crack detection method

We know that the stainless steel seamless pipe has a quality demanding for seamless pipe in the environment of high temperature and pressure.

The cracks on the pipe, as a result of improper machining operation process in the production process may roll or drawing die setting improper reasons, folded, Alice skin, scratches or strain, surface and internal defects. In order to ensure seamless pipe quality, according to the relevant technical standards for products, seamless steel pipe production line required nondestructive testing of surface and interior. Commonly used eddy current testing and magnetic flux leakage detection technology.

Eddy current testing is to establish a non-destructive detection method on the basis of the electromagnetic induction, it will sine current excitation probes coil, when the probe near the Seamless surface, an alternating magnetic field in the coil around the rims surface induced electromotive force generated induced current, i.e. a vortex. The snails and feelings generated magnetic field acting on the coil, thereby changing the electrical parameters of the coil.

The loss resistance of the vortex channel and the eddy-current generation of anti-flux, but also reflected to the probe coil, changing the size and phase of the current in the coil, which changes the impedance of the coil. The probe in the seamless steel surface is moved relative defects encountered, so that the reaction of the eddy current magnetic field of the coil, causing the change of coil impedance, thereby measuring the amount of change identified seamless steel pipe surface defects.

Stainless steel seamless pipe has a high requirement on quality in the environment of high temperature and pressure. Improper machining operation process in the production process may roll or drawing die setting improper reasons and on the pipe, as a result of a crack. Folding, warping, scratches, or strain, surface and internal defects. In order to ensure seamless pipe quality, according to the relevant technical standards for products, seamless steel pipe production line required nondestructive testing of surface and interior. Commonly used eddy current testing and magnetic flux leakage detection technology.

Eddy current testing is to establish a non-destructive detection method, on the basis of the electromagnetic induction it sine current excitation probe coil, the induced electromotive force generated when the probe near the Seamless surface, the alternating magnetic field around the coil rims surface generates an induction current, i.e. vortex. The vortex is also the feelings generated magnetic field acting on the coil, thereby changing the electrical parameters of the coil. The loss resistance of the vortex channel and the eddy-current generation of anti-flux, but also reflected to the probe coil, changing the size and phase of the current in the coil, which changes the impedance of the coil. The probe in the seamless steel surface is moved relative defects encountered, so that the reaction of the eddy current magnetic field of the coil, causing the change of coil impedance, thereby measuring the amount of change identified seamless steel pipe surface defects.