Section 3 - Applications of Materials Flashcards
What type of alloy would you typically find in shallow sections of Casing (up to 1500M)?
Low Alloy Steels would be used in this environment.
What type of alloy would you typically find in deeper sections of Casing?
Alloys with higher percentage of Chrome or Molybdenum, giving greater resistance to burst, collapse and tension loading.
What part does Molybdenum play in CRAs?
Molybdenum is responsible for cementing all the atoms in the CRA together.
In CRAs what is added to increase the strength when high pressure needs to be contained?
Vanadium is added for Strength.
What are the symptoms of H2S Exposure?
Irritated Eyes, Sore Throat, rotten smell which goes away quickly due to impaired sense of smell.
What level of H2S inhalation would lead to instance death?
15% concentration
What is the relative density of H2S to air?
H2S is heavier than air.
In a dynamic Seal, what would the impact of bending be?
Bending would provide a leak path across the mateable parts and lead to contravention of the zero leak rate.
Name two proprietary materials used in CRA dynamic seal materials?
Stellite and Tungsten Carbide
What is Stellite?
A work hardening CRA - Stellite has a number of different grades covering a range of applications.
What is Tungsten Carbide?
A mixture of powdered carbon and tungsten, sintered together at high temperature.
What is used to finish Tungsten Carbide?
Diamond equipment, as Tungsten Carbide is extremely hard.
Is Tungsten Carbide seen more in Sliding or Rotating sealing applications?
Tungsten Carbide is seen more commonly in sliding stem applications as opposed to rotating equipment.
