Materials Of construction Flashcards
What alloy is a mix of austenite and ferrite?
Duplex alloy
Name 4 materials used in brewing vessels
Wood
Copper
Aluminum
Stainless steel
List 5 material properties that must be considered in brewing vessels
Strength
Clean ability
Finish
Corrosion resistance
Density
Heat capacity
List 5 types of metal corrosion
General uniform
Galvanic
Erosion
Pitting
Contact
Stress corrosion
What is passivation?
Removal of free iron contamination
What does passivation do?
Forms a protective chromium oxide layer
What are the general parameters of passivation?
Time 20-120m
Temp 60-160f
Concentration of nitric or citric acid
What are 3 types of welding methods?
Stick
MIG
TIG
Why might TIG be used in a brewery?
Areas that need thin welding
Quality of the weld
Name 6 materials that may be transferred by piping in a brewery
Process
Water
Steam
Glycol
Condensate
Co2
Natural gas
Refrigerant gas
Why is it important to inspect gaskets on a routine basis?
To make sure there are no torn or cracked gaskets
What are some characteristics of EPDM?
Resistant to mild acids, alkaline, alcohol
Good tensile strength
Abrasion resistant
What are some characteristics of Buna-N?
Resistance to compression set and abrasion
Good oil and solvents resistant
Trouble holding up to oxidizers
Trouble with temps over 80c
What are types of gasket materials?
EPDM
Buna-N
Viton
Teflon
Silicone
Neoprene
Why do we insulate in a brewery?
Prevent water condensation on cold surfaces
Conserve energy by reducing heat loss or gain
Prevent or reduce damage to equipment
Increase operating efficiency of HVAC
