ppi water system hdpe-21-century ppt.pdf
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Polyethylene Water Distribution pipeTRANSCRIPT
March 30, 2006 – Nashville, TN
HDPE
The Water System of the 21st Century
March 30, 2006 – Nashville, TN
PE usage in municipal
applications continues to
increase-
March 30, 2006 – Nashville, TN
• Identification of System Needs & Concerns
• Evolution of Water Systems
• Differences in Material Characteristics
• Corrosion Related Issues
• Installation Methods
Reasons for this increase will be examined
in our discussion of the following topics
March 30, 2006 – Nashville, TN
The American Society of Civil Engineering has issued a report card on the condition of our nations municipal infrastructures
DDDD““““America’s wastewater and drinking water
systems are both quintessential examples of
aged systems that need to be updated.”
ASCE; March 2001, www.asce.org/news
Identification of System Needs & Concerns
March 30, 2006 – Nashville, TN
Identification of System Needs & Concerns
The growing reality of Dwindling and Strained Water Resources
March 30, 2006 – Nashville, TN
The report estimates that $138.4 billion (‘95 $) needs to be
spent on infrastructure to meet existing regulations through
2014.
Nation’s Water Distribution System is in serious need
of repair.
First Report to Congress G-058, 1/97
Identification of System Needs & Concerns
March 30, 2006 – Nashville, TN
“If pressure is lost or if negative pressure is induced,
contaminated water or sewage can be pulled into the system
through leaks.”
“When distribution pipe begins to deteriorate, disinfectants
are less effective in controlling microbiological growth.”
“Even in systems with excellent treatment, leaking pipes can lead to a loss
of pressure and cause back-siphonage of contaminated water.”
Identification of System Needs & Concerns
March 30, 2006 – Nashville, TN
250,000 gallon tank, 250,000 gallon tank, 250,000 gallon tank, 250,000 gallon tank, (NM, 1944)(NM, 1944)(NM, 1944)(NM, 1944)
500,000 gallon tank, (Typical, today) 500,000 gallon tank, (Typical, today) 500,000 gallon tank, (Typical, today) 500,000 gallon tank, (Typical, today)
Evolution of Water Systems
March 30, 2006 – Nashville, TN
2000 and 2000 and 2000 and 2000 and
BeyondBeyondBeyondBeyond
wood, cast iron, spun iron,
ductile iron, steel, asbestos, PVC
Evolution of Water Systems
March 30, 2006 – Nashville, TN
According to the AWWA 2002 “Survey of State Agency
Water Loss Reporting Practices” the reported range for
“unaccounted-for-water” from 23 states and 3 regional
authorities range from 7.5% to 20% with 15% being the
most common.
What does HDPE offer?
Solution to water loss and water conservation
According to the July 1994 issue of the AWWA Opflow magazine,
a 10% to 15% reported water loss in typical municipal water systems
is considered to be the acceptable industry standard.
March 30, 2006 – Nashville, TN
A source of water loss: Pipe Corrosion
According to NASSCO, a
single hole the same
diameter as this #2
pencil (approx 1/4”) in an 80
psi system can result in
the loss of almost 15,000
gpd, or 5.5 million gpd
March 30, 2006 – Nashville, TN
= Per month
Eleven 500,000 gallon-towers per year
It’s a loss of valuable resources!
March 30, 2006 – Nashville, TN
Another source of water loss: deteriorated gaskets.
Joints are the weak link and most pipes are still jointed.
100 Years Ago Today
March 30, 2006 – Nashville, TN
Technology: Water storage vs. pipe joining
Out of Sight – Out of Mind?
March 30, 2006 – Nashville, TN
Nominal Pipe Size 12" 12" 12"
Test Section 50 Joints, 40' Sections
(2000')
50 Joints, 20' Sections
(1000')
50 Joints, 20' Sections
(1000')
Test Pressure 150 psi 150 psi 150 psi
Type of JointHDPE
Thermo-Fused
Ductile Iron
Push On
PVC
Bell & Spigot
Test StandardPPI Hydrostatic
Testing Procedures
AWWA C600-93
(pg 21)
AWWA C605-94
(pg 17)
Maximum Acceptable
Gallon per Hour Loss 0 1.1 0.99Maximum Acceptable
Gallons per Day Loss 0 26.4 23.76Maximum Acceptable
Gallons per Year Loss 0 9,636 8,672
Acceptable water loss in a brand new system
Published allowable leak rates
March 30, 2006 – Nashville, TN
A totally fused HDPE system encounters
gasketed joints only at the points where it
transitions into other piping systems.
Gaskets are all but eliminated.
No Joints = No Leaks
March 30, 2006 – Nashville, TN
Issues with Biofilm
March 30, 2006 – Nashville, TN
““““Once sent into the
distribution system, the
microorganisms could adapt
to the distribution system
environment.
Biofilm
Extensive research has shown
that bacteria are more resistant
to disinfection when they are
attached to or associated with
various surfaces…
EPA 625/R-92/001 June 1992
“ ….iron may be an important nutrient
for microbial growth.”
Victoreen (1977, 1980, 1984)
March 30, 2006 – Nashville, TN
Biofilm and restricted flow will:
• Increase use of disinfectant
• Require larger pipe sizes
• Increase pumping costs
• Decrease water availability and quality
• Increase overall costs
Biofilm
March 30, 2006 – Nashville, TN
Given the same conditions, HDPE or PVC can deliver the same
flow with an inside diameter that is only 92% that of DI.
HDPE can deliver the same flow as PVC but HDPE delivers it in
a totally fused leak-free system which does not have to
compensate loss of flow due to water loss.
Material "C" Values for Hazen & Williams Formula
New 13-20 yrs 26-30 yrs
DI 130 100 90
HDPE 150 150 150
Flow Issues
March 30, 2006 – Nashville, TN
Immediate savings (time & money) can be realized
through the use of cost effective installation procedures
Pipe Bursting Directional Drilling
Immediate Savings
March 30, 2006 – Nashville, TN
Zero Zero Zero Zero Joints andJoints andJoints andJoints and no no no no leaks leaks leaks leaks service taps would be heat fused onservice taps would be heat fused onservice taps would be heat fused onservice taps would be heat fused on
13131313 ---- 22 1/222 1/222 1/222 1/2o o o o fittings = fittings = fittings = fittings = 26 26 26 26 gasketed joints gasketed joints gasketed joints gasketed joints
not including service tapsnot including service tapsnot including service tapsnot including service taps
Cul-de- Sac
Typically Uses
HDPE Use:
March 30, 2006 – Nashville, TN
A totally fused PE system is monolithic
and it requires no restraints except where
it transitions to non-PE systems
Restraining Joints
March 30, 2006 – Nashville, TN
•PE is flexible
•PE is durable
•PE is resists chemicals and corrosion
•PE pipes are smooth and have excellent flow
characteristics
•PE pipes can be reliably joined by heat fusion
Why should you be considering HDPE?
March 30, 2006 – Nashville, TN
PPIPPIPLASTI CSPLASTI CSPIPEPIPE
INSTITUTEINSTITUTE
Thank you for your attention