airblown minicable factors that influence.pdf
DESCRIPTION
AirBlown MiniCable Factors That Influence.pdfTRANSCRIPT
-
FactorsThatInfluenceTheInstallationPerformanceOfBlownCables&Fibres
RalphSutehall PrincipalInstallation&ApplicationsEngineer.
PrysmianGroupThursday8th December,17.25 18.25pm
-
Cable/FibreUnitDesigns
BlownFibre Minicables ConventionalBlownCables
FibreCount 1 12f 24 218f 24 288f
DiameterRange
1.0 1.4mm 5.7 8.8mm 12.8 15.1mm
Tube/DuctSize 3.5/5.0mm 8/10mm,10/12mm
12/16mm
20/25mm
(144fibreversionshown)
(96fibreversionshown)
(4fibreversionshown)
-
DuctDesigns
BlownFibre Minicables ACTION
Max.TubeCount Upto24 Upto7 1
Max.FibreCount Upto288f Upto1008f 288f
DiameterRange 11 34mm 12 45mm 25mm
TypicalBlowingDistance
800 1000mts 1000 2500mts Upto3000mts
Typicalblowingdistancesaregovernedbyroutedifficulty
-
FillFactors&FlowRates
Upto3000mts1000 2500mts800 1000mtsTypicalBlowingDistance
BlownFibre MiniCables ACTION
FillFactor 8 16% 8mmBore 52 66%
10mmBore 42 77%
41 56%
AirflowRate
@10bar
18l/min 8mmBore 160l/min
10mmBore 280l/min
~1500l/min
FreeSpace 37mm2 250 290mm2 1077 1128mm2
-
Influences
CableDesign
MiniDuctDesign
RouteDesign
QualityOfMiniductInstallation
InstallationEquipment
-
CrashTest.
InorderforthefindingsinthispresentationtobevalidwemustassumethatpriortoanyinstallationcommencingtheinstallerhasundertakenaCrashTest withthecable/fibreandduct.Thiswilldeterminethemaximumlevelofpushforcethatcanbesafelyappliedtothecable/fibrebytheblowinghead.
Thiswillensurethatthecable/fibrewillbeinstalledinamannerthatWillnotdamageit.
-
RouteConfiguration ForTheoreticalCalculations
25 m
15 m
180 m110 m
Start
-
RouteConfigurations ForPracticalEvaluations
100 m
Multiple Ducts
Total route length 1100 m
As recommended by IEC 60794-1-2 Ed 3.0 draft
1 m
-
Route Design
Cable/Fibre Unit Design
Installation Equipment
Mini-duct Design
Installation OfMini-duct & Cable/Fibre
-
CableDesignCableDesign
-
Factors
CoefficientOfFrictionOfCableSheathMaterial
Diameter
Stiffness
Weight
-
0102030405060708090
5 5.2 5.4 5.6 5.8 6 6.2 6.4 6.6 6.8 7
Cable Diameter (mm)
F
i
l
l
f
a
c
t
o
r
(
%
)
CableDiameter FillFactor
8.0mm Bore
10.0mm Bore
-
050
100150200250300350400450
0 200 400 600 800 1000 1200
Distance (m)
A
i
r
F
l
o
w
(
l
/
m
i
n
)
CableDiameter Cable ReductionInAirFlowDuringInstallationOfA6.5mm DiaCable
Air flow Installation performance for the cable
14 bar/10mm bore
10 bar/10mm bore14 bar/8mm bore10 bar/8mm bore
-
0200
400600
8001000
12001400
1600
0.1 0.11 0.12 0.13 0.14 0.15 0.16
Coefficient of Friction
D
i
s
t
a
n
c
e
(
m
)
CableDiameter AffectofPushForce
Push force Installation performance of the cable
300N
225N
150N
-
CableSheathFinish
Smooth Reflective HighlyReflective
Smooth - Air flowHighly Reflective - Viscous Drag of Air
-
0200400600800
1000120014001600
0 0.05 0.1 0.15 0.2 0.25 0.3
Amplitude (m)
D
i
s
t
a
n
c
e
(
m
)
CableDiameter AffectofPushForceCoF0.1 Pitch20m
6.5/10mm-300N
5.7/8mm-200N
Cable diameter Maximum push force Blowing performance
-
0200400600800
1000120014001600
0.1 0.11 0.12 0.13 0.14 0.15 0.16
Coefficient of Friction
D
i
s
t
a
n
c
e
(
m
)
Weight
42 kgs/km
Weight Blowing performance
33 kgs/km
-
MiniDuctDesign
-
Factors
CoefficientOfFrictionOfInnerBore
Diameter
MiniductConfiguration
-
0200400600800
1000120014001600
0.1 0.11 0.12 0.13 0.14 0.15 0.16
Coefficient of Friction
D
i
s
t
a
n
c
e
(
m
)
AffectOfCoefficientOfFriction
6.5mm Diameter Cable
5.7mm Diameter Cable
Coefficient of friction Blowing performance
-
01
2
3
4
5
6
0 200 400 600 800 1000 1200
Distance (m)
P
u
s
h
F
o
r
c
e
(
b
a
r
)
AffectOfMiniductBoreSize 6.5mmDiaCablePushForceRequiredToKeepInstallationSpeedAt60m/min
10mm Bore
8mm Bore
Fill factor Installation speed Blowing performance
-
MiniductConfiguration
CableType
15349122Stiffness(Nm2)
Trench FloorThe ability of the duct cable to follow undulations, horizontal or vertical, has a
significant affect on the blowing performance.
-
RouteDesign
-
Factors
Length
QualityOfDesign
Length
QualityOfDesign
-
050
100150200250300350400450500
A
i
r
F
l
o
w
(
l
/
m
i
n
)
200 400 600 800 1000Route Length (m)
AffectOfRouteDistance 10/8mmMiniduct
1
0
b
a
r
1
2
b
a
r
1
4
b
a
r
Route length Air flow
-
QualityOfMiniductInstallation
-
Factors
Undulations
-
LackOfUnderstanding?
-
0200
400
600
800
1000
1200
1400
1600
0 0.05 0.1 0.15 0.2 0.25 0.3
Amplitude (m)
D
i
s
t
a
n
c
e
(
m
)
AffectOfInstallation 6.5mmCableInto8mmBoreMiniduct
20 m Pitch0.16 CoF
20 m Pitch0.1 CoF
5 m Pitch0.1 CoF
5 m Pitch0.16 CoF
Quality of installation of mini-duct Blowing performance .
-
0200400600800
1000120014001600
0 0.05 0.1 0.15 0.2 0.25 0.3
Amplitude (m)
D
i
s
t
a
n
c
e
(
m
)
20 m Pitch0.1 CoF
20 m Pitch0.16 CoF
5 m Pitch0.16 CoF
5 m Pitch0.1 CoF
AffectOfInstallation 6.5mmCableInto10mmBoreMiniduct
An approximate 10% improvement in blowing performance overthat of an 8mm bore mini-duct.
-
InstallationEquipment
-
Factors
BlowingHead
CablePayoff
Compressor
Lubricant
-
0200400600800
1000120014001600
0 0.05 0.1 0.15 0.2 0.25 0.3Amplitude (m)
D
i
s
t
a
n
c
e
(
m
)
AffectOfPushForce 0.1CoF 5.7mm&6.5mmCableIntoA10mmBoreMiniduct.300NPushForce
5.7/5m Pitch6.5/5m Pitch
6.5/20m Pitch5.7/20m Pitch
Assuming that the maximum push force can be applied to each cable then the installation performance of the reduced diameter
cable will be the best.
-
0200400600800
1000120014001600
0 0.05 0.1 0.15 0.2 0.25 0.3Amplitude (m)
D
i
s
t
a
n
c
e
(
m
)
AffectOfPushForce 0.1CoF 5.7mmCableIntoA8mmBoreMiniduct
300N/5m Pitch
200N/5m Pitch
200N/20m Pitch
300N/20m Pitch
In order to gain the benefits from a reduction in cable diameter the maximum push force that can be applied to the cable must remain
at a high level.
-
Compressor
Ashasbeenseenfromthepreviousgraphsitisimportanttomaximisetheairflowthroughtheroute.Inordertoachievethisthecompressormustbeabletodeliverairattypically14barminimum.
Thisairshouldbecleananddryandshouldbedeliveredtotheblowinghead/miniductviaanaftercooler.
Ifusingpneumaticallydrivenblowingheadsthenconsiderationjustbegiventothelevelofairthatisbeingconsumedbytheairmotor.
-
AffectOfAftercooler
0
1
2
3
4
5
6
7
8
-20 -10 0 10 20 30 40 50 60
Ambient Temperature (C)
W
a
t
e
r
F
l
o
w
R
a
t
e
(
l
/
h
r
)
100% RH, No A/c
50% RH, No A/c
Aftercooler
Use aftercooler: Moisture Level in Compressed Air
-
CableDrums
3kms Of Cable Old vs New
Must be lightweight but strong enough to protect the cable.Material must be smooth so that the cable sheath is not damaged if it
comes into contact with the flange.
-
CablePayoff
Spindle Roller Bearing Axle Collar
These are important as you must be able to provide an even low tension during the installation of the cable.
-
Lubricant
Ithasbeenshownthatthecoefficent offrictionbetweenthecableandtheminiductboreiscrucial.Itisthereforerecommendedthatadditionalwetlubricantisaddedtotheductpriortoinstallingthecableorlubricatingthecableduringtheinstallationprocess.Thiscanimprovetheinstallationperformanceofthecablebyasmuchas20%.
Thiswetlubricantmustbespecificallydesignedfortheinstallationofminicables.Usinglubricantdesignedforwinchedcablesisnotrecommended.
Theuseofwetlubricantisnotrecommendedforusewithblownfibre.
-
InlineLubricators
Suitable for mini-duct sizes up to 16mm.Suitable for cable sizes up to 9mm
-
%ageAffectOfLubricationMethod
0
10
2030
40
50
6070
80
90
100
HDPE Mini-duct Only Low Friction LinerMini-duct
Low Friction LinerMini-duct plus Field
Lubrication
No Lubricator Lubricator
M
a
x
i
m
u
m
B
l
o
w
i
n
g
D
i
s
t
a
n
c
e
S
p
o
n
g
e
A
p
p
l
i
c
a
t
i
o
n
-
Route Design
Summary
-
Conclusions
Theinstallationofminicables/fibresintominiductsisaninteractivesystem. Primaryfactors:
thequalityoftheinstallationoftheminiductcable. thecoefficientoffriction,betweentheminicableandminiductbore.
Settinguptheinstallationequipmentcorrectlybyundertakingacrashtest