PIPING SYSTEMS DESTINED FOR FAILURE - World Plumbing
Transcript of PIPING SYSTEMS DESTINED FOR FAILURE - World Plumbing
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PIPING SYSTEMS DESTINED FOR FAILURE
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MEASUREMENT
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PPR FAILURES
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STRESS FATIGUE
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ENTRAINED AIR
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INCREASE IN MATERIAL FAILURE
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FACTORS
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MEDIA REPORTS
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MEDIA REPORTS
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MEDIA REPORTS
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MEDIA REPORTS
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MEDIA REPORTS
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MEDIA REPORTS
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MEDIA REPORTS
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MEDIA REPORTS
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MEDIA REPORTS
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WHY NOW
?WHAT HAS CHANGED
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EXPANSION CONTROL VALVE
1200 kPa
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ECV
1200 kPa
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TEMPERATURE MIXING VALVE
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MIXING VALVE
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AIR RELEIF VALVE
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AIR RELIEF VALVE
INCREASED PRESSURE
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AIR RELIEF VALVE
EXPANSION TANK
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BACKFLOW
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BACKFLOW
PRESSURE DROP
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VSD PUMPS
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VSD PUMPS
CYCLIC PRESSURES
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VSD PUMPS
CYCLIC PRESSURES
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PRESSURE REDUCING VALVE
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PRV
CYCLIC PRESSURES
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COMBINE ALL DEVICES TOGETHER
WHAT HAPPENS?
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DAMAGING SYSTEM DYNAMICS
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FIXED ONE PROBLEM
!ONLY TO CREATE ANOTHER
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PRESSURE AIR
COMBINATION
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AIR PRESSURE
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AIR TEMPERATURE
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AIR EXPANSION AT PRESSURE
0.00%
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
80.00%
90.00%
100.00%
0 200 400 600 800 1000 1200 1400 1600
perc
enta
ge v
olum
e
kPa gauge pressure
Air volume under pressure
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PRESSURE DROP
400kpa
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AIR IN PIPES + RAPID PRESSURE DROP
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EQUALS CAVITATION
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SUMMARY
• COMPLEX FLUID DYNAMICS
• RANGE OF MODERN EQUIPMENT
• CHANGES IN SYSTEM DESIGN
• INCREASED INSTALLER ERROR
PIPING FAILURES ARE A COMBINATION
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WE CAN’T SOLVE
PROBLEMSBY USING THE SAME KIND OF
THINKINGWE USED WHEN WE CREATED THEM
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Thanks for listening