Download - Pipe system life time cost
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Pipe system life time cost
Energy will be increasingly precious Environment focus will grow The pipe system is expensive Life time expectancy is over 30 Years
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What is life time cost ?
Investment cost– Pipe material– Pipe installation– Excavation and restoration– Inspection
Operation cost– Pumping– Heat loss
Maintenance cost– Repairs– Management
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The Calculation Example
The model system supplies 10 MW Flow 90OC and return 50OC The pipe system is: 2 x 1000 m. DN 250 2 x 1500 m. DN 80 100 consumer connections a´100 kW
2 x 2500 m. DN 32 100 consumer connections a´10kW
2 x 2000 m. 18 mm. Cu-flex
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Investment cost Thump rules
Pipes 380 000 EUR Insulation series 2 + 12% Double Pipes + 25% X-linked shrink joints +5% Pipe installation 50% of pipes Inspection 0- 50 000 EUR Excavation 100% of pipes Series 2 + 15% Double – 20% Asphalting 50% of pipes
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Heat conductivity
PUR = SOLID +RADIATION +GAS
SOLID is not changing over time
RADIATION is not changing over time
GAS varies with the diffusion
SOLID +RADIATION app. 6 – 12 mW/mK depending upon the cell structure
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The gas composition
The gas is Cyklopentane, CO2 and air Cyklopentane, CP 40% Carbon dioxide, CO2 55% Air ( N2 + O2 ) 5%
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Lambda gas
Cyklopentane: 0,012 W/mK Carbon dioxide: 0,017 W/mK Air: 0,027 W/mK
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Lambda values new Logstor pipes
Conti pipes: 0.024 W/mK Traditional pipes: 0,0275 W/mK Flex pipes: 0,025 W/mK
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Lambda ageingTraditional vs. Conti w. Barrier
22
23
24
25
26
27
28
29
30
31
32
33
New 5 Years 10 Years 15 Years 20 Years 25 Years 30 Years
22 Cu-flexDN 32DN80DN250LR-ContiLR Cu-flex
mW/mK
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German German failurefailure statisticstatistic
5
2000 25%
50%
4%
16%
5%
Weld seams
Joints
Casing+insulationDetectionsystemSundries
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Swedish failure statisticsSwedish failure statistics
5
1998-200141%
45%
1%
12%
1%
Steel shells
Slide over
Weld joints
HDPE shrink
PEX shrink
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Failure rates
With simple and cheap joints Joint failures may be > 0,5 failure/km./year
With PEX shrink joints or weld joints joint failures are < 0,05 failure/km./year
With low inspection rates Weld seam failures may be > 0,2 failure/km./year
With proper inspection Weld seam failures may be < 0,02 failure/km./year
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Failure costs
The repair cost for a simple failure is estimated 3 000 EUR
The example: With cheap joints, repair cost is 20 000 EUR / year With PEX- and weld joints, it is < 2 000 EUR / year With low inspection, weld repair cost is 10 000 EUR / year With proper inspection, it is 1 000 EUR / year
Do it cheap and easy and you have high repair costs Do it right and you have low repair costs
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Life time costsThe following picture compares:
“Series 1 cheap”: DN 25, DN 32, DN 80, DN 250 all traditional without barrier, cheap
joints and low inspection level.“Series 1 barrier”: 18 Cu-flex, DN 32, DN 80, DN 250 Conti pipes with barrier, PEX
joints and proper inspectionSeries 2 barrier: 18 Cu-flex, DN 32, DN 80, DN 250 Conti pipes with barrier, PEX
joints and proper inspectionDouble pipes: 18 Cu-flex, DN 32, DN 80, all double and DN 250 Conti pipes with
barrier, PEX joints and proper inspectionConst. Flow: is Series 1 cheap with constant flow pumps
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Life time costs
0100020003000
4000500060007000
Serie 1cheap
Serie 1Barrier
serie 2Barrier
Double constflow
FailuresHeatlossPumpingInspectionAsphaltEscavationInstallationPipes
kEUR Present values
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Life time cost
Calculation settings: Pumping energy 1% of total heat supply Constant flow pumps 3% of total heat supply Heat price 0,025 EUR/kWh Power price 0,06 EUR/kWh All amounts as present value over 20 years Inflation 2% Energy price rise 2% Bank interest 6%
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The lessons are:
Do not save on inspection Do not accept “cheap” joints Keep your heat loss down Use flow controlled pumps