Exam Dumps VCE

QUESTION 16
PWHT is ___________ in preventing caustic SCC.

QUESTION 17
Internal galvanic corrosion in piping near the joint of two dissimilar metals is best detected by external:

QUESTION 18
In general, the resistance of carbon steel and other alloys to High temperature corrosion is determined by the ________ content of the material.

QUESTION 19
__________ are the most common type of equipment susceptible to carburization in the refining industry.

QUESTION 20
SSC generally occurs below about ________.

QUESTION 21
Stainless steels with sigma can normally withstand normal operating stresses but upon cooling to temperatures below _______ may show a complete lack of fracture toughness as measured by a Charpy impact test.

QUESTION 22
__________ testing is the best method to determine the susceptibility of a material to hydrogen stress cracking.

QUESTION 23
What treatment is used to prevent boiler feed water corrosion?

QUESTION 24
Temper embrittlement can be identified by a(n) shift in the ductile-to-brittle transition temperature measured in a Charpy impact test.

QUESTION 25
If wet electrodes or high moisture content flux is used, ________ can be charged into the steel resulting in delayed cracking.

QUESTION 26
Reheat cracking is most frequently observed in _______ grained sections of a heat-affected zone.

QUESTION 27
Hydrochloric acid corrosion is a general and localized corrosion and is very aggressive to most common materials of construction. Damage in refineries is often associated with dew point corrosion in which vapors containing _______ and hydrogen chloride condense from the overhead stream of a distillation, fractionation, or stripping tower.

QUESTION 28
The best way to prevent 885(o) F embrittlement is to use low ________ alloys, or to avoid exposing the susceptible material to the embrittling range.

QUESTION 29
Most brittle failures appear as:

QUESTION 30
Hydrogen blisters may form as surface bulges on the ID, the OD on within the wall thickness of a pipe or pressure vessel. Blistering occurs from hydrogen generated by ______, not hydrogen gas from the process stream.

QUESTION 31
____________ is the reduction in toughness due to a metallurgical change that can occur in some low alloy steels as a result of long-term exposure in the temperature range of about 650(o) F to 1100(o) F.

QUESTION 32
With CO(2) corrosion, increasing temperatures _________ corrosion rates up to the point where CO(2) is vaporized.

QUESTION 33
Mechanical fatigue is caused by:

QUESTION 34
Which of these materials are susceptible to creep damage?

QUESTION 35
Hydrochloric acid corrosion is a general and localized corrosion and is very aggressive to most common materials of construction. Damage in refineries is often associated with dew point corrosion in which vapors containing _______ and hydrogen chloride condense from the overhead stream of a distillation, fractionation, or stripping tower.

QUESTION 36
Corrosion of carbon steel and other alloys from their reaction with sulfur compounds in high temperature environments is called ______. The presence of hydrogen accelerates corrosion.

QUESTION 37
_________ 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.

QUESTION 38
What is the chemical symbol for butane of butylenes?

QUESTION 39
In a wet H2S-type environment, what fluid material will significantly increase the probability of blistering?

QUESTION 40
The rate of creep deformation is a function of the material, load and temperature. The rate of damage is sensitive to both load and temperature. Generally, an increase of about _______ or an increase of ________ on stress can cut the remaining life in half.