Polymers Flashcards
1
Q
What Polymer replaces Cast Iron in local distribution gas pipes?
A
Polyethylene (PE)
2
Q
What is the problem with cast iron in local distribution pipes?
A
Corrosion, leakage, Brittleness, time constraint/expertise to rejoin
3
Q
What are the desirable properties for low pressure distribution pipe?
A
Chemical environment • Toughness, yield stress • Stiffness • Ease of joining/fusion • Pressure requirements • Creep/creep rupture • Strength • Soil loads • Environmental stress cracking • Defects • Runaway crack growth • Cost
