WATER APPLICATIONS PIPINGwenco.com.au/download/114/engineering-design-msds/1879/eng1100-hvac.pdf ·...
Transcript of WATER APPLICATIONS PIPINGwenco.com.au/download/114/engineering-design-msds/1879/eng1100-hvac.pdf ·...
Water Applications PipingApplications • District Heating & Cooling
• Steam Condensate Return• Waste Water
• Condenser and Cooling Tower Piping• NSF Listed for Potable Water• FM Approved for Underground Fire Mains
Materials andConstruction
We offer several products that have over 40 years of successful history incommercial and institutional water distribution systems.
Green Thread® Pipe - An epoxy based piping system available in 1”-42”diameters rated to 400 psig, up to 225°F.
Red Thread® II Pipe - An epoxy based piping system available in 2”-42”diameters rated to 400 psg, up to 210°F.
F-Chem® Pipe - Custom piping available through 72” diameter.
Fittings Fittings are manufactured with the same chemical/temperature capabilities as the pipe. Depending on the particular part and size, fittings will be compression molded, contact molded, hand fabricated or filament wound.
Joining Systems
Bell & SpigotMatched-taper joint secured with epoxy adhesive. Self-locking featureresists movement, facilitating joining runs of pipe without awaiting adhesivecure.
FlangedAvailable for all piping systems and diameters; factory assembled orshipped loose for assembly in the field.
Butt & WrapPlain end pipe or pipe and fittings butted together and wrapped with multiplelayers of resin-saturated mat or woven roving. Can be used with all pipingsystems and diameters.
Pipe
SizeRange
in. Resin
Pressure Rating psig
Inner Corrosion
Barrier/Liner Thickness
in.Temp. Rating
Joint Types
ASTM
D2310Class
Product/Installation
Manuals
Green Thread
1 - 42Aromatic
Amine Epoxy
225-450 0.015 - 0.030225°F107°C
Bell & Spigot
RTRP-11FFRTRP-11FY
CI300INS1000
Red Thread
II
2 - 3 Aromatic Amine Epoxy
225-450 Resin Rich210°F100°C
T.A.B. or Bell & Spigot
RTRP-11AF CI1200INS10004 - 42 RTRP-11AH
F-Chem 14 - 72Polyester,
Vinyl Ester
50-150 0.020 - 0.250200°F93°C
Bell & Spigot(1), Flanged, Butt & Wrap
RTRP-12EUCI1900
INS1010INS1000
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(1) FChem bell x spigot joints are not available in all sizes. Consult factory for specific details.
1000400 500 600 700 800 2000 3000 4000
Gallons per Minute
1.0
10.0
.4
.5
.6
.7
.8
.9
2
3
456789
6"
6"
6"
8"
8"
8"10"
10"
10"
12"
12"
12"
FRPSteelPVCD
ynam
ic H
ead
Loss
(Fee
t H2O
/100
Ft.
of P
ipe)
FIGURE 1 • Pressure Loss Curves for WaterFRP & PVC based on Darcy-Weisbach & Colebrook Equations
Sch. 40 Used Steel based on Hazen-Williams Equation “C” Factor 100
Flow Properties
NOV Fiber Glass Systems piping has an absolute roughness of 0.00021 inches. This is equivalent to a Hazen-Williams coefficient of 150. The smooth surface coupled with large flow areas translates into:
• Lowfrictionloss•Smallerpumpmotors• Lowerenergycost•Abilitytoreducepipesize
Head losses for fiberglass, Schedule 40 steel and PVC pipe are shown in Figure 1.
3
8” Pipe Sch. 40
SteelSch. 80
PVCRed
Thread II
Design
Flow Rate (gpm) 1500 1500 1500
Flow Area (in.2) 50.0 45.0 54.8
Velocity (ft./sec.) 9.62 10.71(1) 8.78
Head Loss (ft)
Pipe (1000 ft)(2) 39.74 37.66 23.21
Elbows (14) 3.42 4.24 2.85
Gate Valves (2) 0.32 0.39 0.26
Elevation Change 10.00 10.00 10.00
Total Head Loss 53.48 52.3 36.32
Power
Brake Horsepower 25.3 24.76 17.20
Pump Horsepower(3) 29.8 29.13 20.23
Motor Usage(4) (kw) 22.2 21.72 15.09
Recommended Motor(5) 40 hp 40 hp 30 hp
(1) Exceeds manfacturer’s maximum recommended velocity(2) Hazen-Williams coefficient 80 for Sch. 40 Steel(3) 80% pump efficiency(4) 85% motor efficiency at ¾ load(5) ¾ load operation(6) 2010 Pricing Basis
TABLE 1 Pressure Drop and Power Consumption
3’3’
3’
5’
450’
3’
5’
12’
10’
3’
5’
1’1’
3’3’
3’
5’450’
3’
5’
20’3’
1’
GRADE
GRADE
GRADE
GRADE
BLD. WALL
Sample DesignA 500 ton cooling tower requires approximately 1,500 gpm condenser water. Using the system design in Figure 2, Table 1, compare the pressure drop and horsepower requirement of 8” pipe using the following materials:
Red Thread II Schedule 40 steel Schedule 80 PVC
Centrifugal PumpsClose Mounted, 230/460V, 3-Phase Motors
FIGURE 2
Project Life 25 Years Annual System Usage Time 75% Electrical Cost 10 cents/Kwh Discount Rate 4%
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Life CycleCost ComparisonThis comparison does not take into account the cost reductions for fiberglass piping systems due to:
• Elimination of cathodic protection needed with steel pipe • Reduces water treatment chemical use• Lighter load rated pipe support systems• Fewer pipe supports needed than with PVC pipe• Lower maintenance cost
Cost Description(1)8” Sch. 40 Steel
8” Sch. 80 PVC
8” Red Thread II
Year Zero Cost
Pump, Motor & Combination Starter
$10,271 $10,271 $9,124
Pipe Installed Cost $91,664 $76,054 $90,902
Total Installed Cost $101,935 $86,325 $100,026
Annual Electrical Cost $15,237 $14,899 $10,347
Present Worth 30 Yr. Life Cycle Cost
$373,698 $352,054 $284,568
TABLE 2 Pipe Type vs. Life Cycle Cost
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(1) 2010 Pricing Basis
Pipe Support Comparison
The light weight and high strength of fiberglass pipe results in support spans comparable with Schedule 40 steel pipe spans. PVC pipe typically requires three times the number of supports as required for fiberglass piping Table 3 contains typical support spans versus operating temperature for fiberglass, PVC and steel pipe.
Fiberglass pipe is typically one-eighth the weight of steel (see Table 4). Fiberglass pipe filled with water weighs 40% - 50% less than Schedule 40 steel resulting in lower loads on supports and buildings. (See Table 5)
Nominal Diameter Pipe Material
Spans, ft.
75 150 200
6”
Sch. 40 Steel 17.0 17.0 17.0
Green Thread 20.5 19.1 18.0
Red Thread II 19.2 18.3 17.5
Sch. 80 PVC 9.4 NR NR
8”
Sch. 40 Steel 19.0 19.0 19.0
Green Thread 23.3 21.7 20.4
Red Thread II 21.1 20.0 19.2
Sch. 80 PVC 10.4 NR NR
10”
Sch. 40 Steel 22.0 22.0 22.0
Green Thread 26.0 24.2 22.8
Red Thread II 23.2 22.0 21.1
Sch. 80 PVC 11.2 NR NR
12”
Sch. 40 Steel 23.0 23.0 23.0
Green Thread 27.9 26.0 24.4
Red Thread II 20.5 23.9 22.9
Sch. 80 PVC 12.3 NR NR
TABLE 3 • Water Filled Pipe Support Spans (ft) For Typical Operating Temperatures (F)
FRP based on ½” max. mid-span deflection Steel & PVC based on published dataNR = Not recommended at temperature
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TABLE 4 • Pipe Weight per Foot (lbs.)
Nominal Diameter 6” 8” 10” 12”
Sch. 40 Steel 18.9 28.5 40.8 53.5
Green Thread 2.4 3.9 5.9 7.7
Red Thread II 2.4 3.3 5.3 7.2
Sch. 80 PVC 5.5 8.3 12.2 16.9
TABLE 5 • Weight Per 20 FootJoint filled with Water (lbs.)
Nominal Diameter 6” 8” 10” 12”
Sch. 40 Steel 630 1005 1500 2041
Green Thread 323 544 831 1169
Red Thread II 327 540 827 1161
Sch. 80 PVC 331 556 859 1206
NOV Fiber Glass Systems’ fiberglass reinforced thermoset resin (FRP) piping systems have relatively low rates of thermal expansion when compared to other materials commonly used in water systems. While PVC expands at 5 times the rate of carbon steel, FRP pipe only expands 1½ to 2 times.
The low rates of expansion and flexibility of fiberglass allow for easy anchor, guide and support design (reference Engineering and Piping Design Guide).
Thermal Expansion Comparison
Case Histories
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City of CovingtonWastewater Treatment Plant
Nebraska HospitalCooling Tower
Dallas, Texas Wastewater Treatment Plant
Oracle,ArizonaBio Dome
Semiconductor Process Waste Stream
NorthernAlberta,CanadaHot Process Water
©2012 National Oilwell Varco. All rights reserved.ENG1100 March 2011
www.fgspipe.com • [email protected]
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