New PDF release: Corrosion and Materials Selection: A Guide for the Chemical

By Alireza Bahadori

ISBN-10: 1118869222

ISBN-13: 9781118869222

The petroleum and chemical industries include a large choice of corrosive environments, lots of which
are specific to those industries. Oil and fuel construction operations eat an immense quantity of iron
and metal pipe, tubing, pumps, valves, and sucker rods. metal corrosion is dear. notwithstanding, the price of
corrosion isn't just monetary. past the large direct outlay of money to fix or substitute corroded constructions are the oblique charges – usual assets, capability dangers, and misplaced chance. losing average assets is an instantaneous contradiction to the growing to be want for sustainable development.

By choosing the right fabric and making use of right corrosion defense equipment, those expenditures can be
diminished, or perhaps eradicated. This publication offers a minimal layout requirement for attention when
designing structures with the intention to hinder or regulate corrosion harm thoroughly and economically, and addresses:

• Corrosion difficulties in petroleum and chemical industries
• Requirements for corrosion control
• Chemical keep watch over of corrosive environments
• Corrosion inhibitors in refineries and petrochemical plants
• Materials choice and repair lifetime of materials
• Surface practise, safety and maintainability
• Corrosion tracking - plant inspection thoughts and laboratory corrosion trying out techniques

Intended for engineers and team of workers operating within the petroleum and chemical industries, this publication can be a important source for study and improvement groups, protection engineers, corrosion experts and researchers in chemical engineering, engineering and fabrics science.

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Additional resources for Corrosion and Materials Selection: A Guide for the Chemical and Petroleum Industries

Example text

Therefore, as long as feedstocks are dry, carbon steel – with various corrosion allowances – can be used for the vessels, piping, and valve bodies of hydrofluoric acid alkylation units. All carbon steel welds that will contact HF, should be post-weld heat treated. Fractionation towers should have Type 410 (S41000) stainless steel tray valves and bolting, and for desiobutanizer tower tray valves and bolting, alloy 400 (N04400) is recommended. Corrosion problems in HF alkylation units occur after shut-down because pockets of water have been left in the equipment.

For example, chloride SCC was caused by seawater spray carried by prevailing winds. The spray soaked the insulation over Type 304 stainless steel, chlorides were concentrated by evaporation, and cracking occurred at areas with residual weld stresses. Other frequent causes of cracking are water dripping on a warm pipe and water leaching chlorides from insulation. As discussed previously, chlorides are present in a number of refining units, including crude distillation, hydrocracking, hydrotreating, and reforming.

As a general rule of thumb, hydrogen stress cracking can be expected to occur in process streams containing in excess of 50 ppm hydrogen sulfide (although cracking has been found to occur at lower concentrations). There is a direct relationship between hydrogen sulfide concentration and the allowable maximum hardness value of the heat-affected zone (HAZ) on one hand and cracking threshold stress on the other. Typically, the allowable maximum hardness value decreases 30 HB, and the allowable threshold stress decreases by 50% for a tenfold increase in hydrogen sulfide concentration.

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Corrosion and Materials Selection: A Guide for the Chemical and Petroleum Industries by Alireza Bahadori


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