PPI Water system hdpe-21-century ppt.pdf

March 30, 2006 – Nashville, TN

HDPE

The Water System of the 21st Century


PE usage in municipal

applications continues to

increase-


• 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


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



The growing reality of Dwindling and Strained Water Resources


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



“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.”



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


2000 and 2000 and 2000 and 2000 and

BeyondBeyondBeyondBeyond

wood, cast iron, spun iron,

ductile iron, steel, asbestos, PVC

Evolution of Water Systems


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.


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


= Per month

Eleven 500,000 gallon-towers per year

It’s a loss of valuable resources!


Another source of water loss: deteriorated gaskets.

Joints are the weak link and most pipes are still jointed.

100 Years Ago Today


Technology: Water storage vs. pipe joining

Out of Sight – Out of Mind?


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


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


Issues with Biofilm


““““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)


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


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


Immediate savings (time & money) can be realized

through the use of cost effective installation procedures

Pipe Bursting Directional Drilling

Immediate Savings


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:


A totally fused PE system is monolithic

and it requires no restraints except where

it transitions to non-PE systems

Restraining Joints


•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?


PPIPPIPLASTI CSPLASTI CSPIPEPIPE

INSTITUTEINSTITUTE

Thank you for your attention

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