Exam 1: Corrosion and Materials

Hardness levels above ________ are highly susceptible to hydrogen stress cracking (HF). Time-to-failure decreases as the hardness increases.

Amine cracking is ________ likely to occur in lean MEA and DEA services than in MDEA and DIPA services.

With sour water corrosion, corrosion increases with __________ NH4HS concentration and __________ velocity.

_________ is a form of carburization resulting in accelerated localized pitting which occurs in carburizing gases and/or process streams containing carbon and hydrogen. Pits usually form on the surface and may contain soot or graphite dust.

What is the chemical symbol for propane or propylene?

ASME Section VIII had few limitations concerning brittle fracture prior to:

Cavitation is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles. Temperatures approaching the boiling point of the liquid are _________ to result in bubble formation.

Which of the following materials are subject to mechanical fatigue?

_________ is accelerated high temperature wastage of materials that occurs when contaminants in the fuel form deposits and melt on the metal surfaces.

What standard refers to Fitness-For-Service evaluations?

The "L" grade of stainless steels will sensitize if exposed more than several hours above _______ or long term above _____.

_________ of the amine system is the most effective way to prevent amine corrosion.

SCC generally occurs below about _______.

Which of the following materials is susceptible to CO₂ corrosion?

Metallic components form a surface __________ when exposed to sulfur compounds. This may react with air (oxygen) and moisture to form sulfur acids (polythionic acid).

Stresses acting on the weldments are significantly ________ when austenitic stainless steel filler metal is used. A nickel based filler metal has a coefficient of thermal expansion closer to carbon steel resulting in significantly lower stress at elevated temperatures.

With sour water corrosion, streams with a pH below ________ indicate the presence of a strong acid.

Cooling water corrosion is a concern with water-cooled __________ and cooling towers in all applications across all industries.

HTHA is dependant on temperature, hydrogen partial pressure, time and _________.

Corrosion from oxygen tends to be __________ type damage and can show up anywhere even if only very small amounts break through the scavenging system.