Materials Science and Escape of Water Claims - Andy Bryce, Hawkins

27 Pages·2014·3.77 MB·English

Big Brother, Another ‘ERA’
and Water Games
By the Liability SIG
Speakers
Tim Young, The Surveillance Group
Martyn Gabbitass, QuestGates Ltd
Andy Bryce, Hawkins
Andy Bryce
Coming up…….
 How horse urine, the monsoon and the British army has
helped us to understand of the failure of plumbing fitting
joints
 Why cheap Asian cooking pots have led to flooded
bathrooms across the country
 The equivalent of “flesh eating bacteria” for copper pipe
 Plastics - not all they are cracked up to be?
 The mysterious corrosion that baffled Samuel Pepys, is
your airing cupboard a victim?
‘Season’ Cracking
India - The British Raj Cracked brass cartridge case
Season cracking…..
stress + Specific corrodant
Horse urine
“Locked-in” stress
from manufacture
Stress Corrosion Cracking (SCC)
High Stress + corrodant
Characteristic microstructure
Crack branching
• Avoid high stress
–
• correct design, manufacture and fitting
• Minimise exposure to potential
corrodant
Stainless steel Braided Flexible hoses
 Very popular as they are easy to fit.
Typical braided hose failure
 Very unusual failure
 “Austenitic” stainless
steel (type 304)