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What was the material of choice for low pressure distribution mains until the 1950's? And what were the pipes subjected to?
What negative properties cast iron has making it unsuitable for modern distribution mains?
What are desirable properties for a material used in a distribution main?
It is essential that pipes "yield before break". To determine this fracture toughness equation is used. Explain the terms on it.
What are the terms in the Materials Index called "Ductility factor"?
What is the general objective of a gas pipe?
What is the main disadvantage of PE Pipes used in gas distribution?
What impacts does the external environment have on PE gas pipes?
What does PE stand for?
How are polymer crystals arranged?
What is an amorphous layer?
Name 2 types non-crystallizing polymers, and some examples of them.
What does LDPE stand for?
What does HDPE stand for?
What does LLDPE stand for?
What does MDPE stand for?
What does UHMWPE stand for?
What does MFI stand for and what is it used for?
What affects the MFI of a polymer?
What is the difference in creep in metals and creeps in a polymer?
What is a severe stress cracking agent?
What is Runaway Crack Growth, and when does it occur?
What does PP stand for?
Is PP a thermoplastic or a thermoset?
What is PU and what is it used for?
How is PU made?
What does PDMS stand for?
