PIPING SYSTEMS DESTINED FOR FAILURE - World Plumbing

PIPING SYSTEMS DESTINED FOR FAILURE

MEASUREMENT

PPR FAILURES

STRESS FATIGUE

ENTRAINED AIR

INCREASE IN MATERIAL FAILURE

FACTORS

MEDIA REPORTS

MEDIA REPORTS

MEDIA REPORTS

MEDIA REPORTS

MEDIA REPORTS

MEDIA REPORTS

MEDIA REPORTS

MEDIA REPORTS

MEDIA REPORTS

WHY NOW

?WHAT HAS CHANGED

EXPANSION CONTROL VALVE

1200 kPa

ECV

1200 kPa

TEMPERATURE MIXING VALVE

MIXING VALVE

AIR RELEIF VALVE

AIR RELIEF VALVE

INCREASED PRESSURE

AIR RELIEF VALVE

EXPANSION TANK

BACKFLOW

BACKFLOW

PRESSURE DROP

VSD PUMPS

VSD PUMPS

CYCLIC PRESSURES

VSD PUMPS

CYCLIC PRESSURES

PRESSURE REDUCING VALVE

PRV

CYCLIC PRESSURES

COMBINE ALL DEVICES TOGETHER

WHAT HAPPENS?

DAMAGING SYSTEM DYNAMICS

FIXED ONE PROBLEM

!ONLY TO CREATE ANOTHER

PRESSURE AIR

COMBINATION

AIR PRESSURE

AIR TEMPERATURE

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

PRESSURE DROP

400kpa

AIR IN PIPES + RAPID PRESSURE DROP

EQUALS CAVITATION

SUMMARY

• COMPLEX FLUID DYNAMICS

• RANGE OF MODERN EQUIPMENT

• CHANGES IN SYSTEM DESIGN

• INCREASED INSTALLER ERROR

PIPING FAILURES ARE A COMBINATION

WE CAN’T SOLVE

PROBLEMSBY USING THE SAME KIND OF

THINKINGWE USED WHEN WE CREATED THEM

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