Water (density = 1.94 slugs/ft³; kinematic viscosity = 0.000011 ft²/s), is pumped between two reservoirs through 400 ft of a 2-inch-diameter pipe and several minor losses (as shown below). The friction factor is 0.0015. The pipe material is structural steel. Given that the gravity acceleration constant = 32.2 ft/s². 21 = 20 ft Sharp entrance Screwed regular Sharp Z2 = 120 ft exit 90° elbow 12-in bend radius Pump Open globe valve 2 400 ft of pipe, d= ft 12 Half-open gate valve Minor loss coefficients: Sharp entrance: K = 0.5 Regular 90° elbow: K = 0.95 Open globe valve (2 in): K = 6.9 12-in bend: K = 0.15 Half-closed gate valve: K = 2.7 Sharp exit: K = 1 According to the performance curves (Model 1509) given below, which pump size shall be the most appropriate to be used in this water supply system in order to achieve a better energy efficiency? With this pump selection for the above system, what will be the efficiency? HEAD IN FEET Taco L/SEC 2,5 500 400 9:25 (235mm) 8.625"(219mm) 300 8.00 (203mm) 7.375"(187mm) 6.75"(171mm)' 200 100 CURVES BASED ON CLEAR WATER WITH SPECIFIC GRAVITY OF 1.0 50 Model 1509 FI & CI Series 7,5 +52% 3500 RPM November 1, 2010 10 12.5 15 17.5 Curve no. 2264 Min. Imp. Dia. 6.75" Size 2.5X 1.5 X 9.0 22.5 20 NPSH 200 -600 REQUIRED NPSH 56% 60% 62% 10HP(7.5KW) 64% 66% 64% 40HP(29.8KW) 60% 56% 48% 30HP(22.4KW) 25HP(18.6KW) 20HP(14.9KW) 15HP(11.2KW) 160 480 -120 -360 F80 -240 40 120 -0 -1000 100 -800 - 80 60 40 40 -20 100 150 200 250 300 350 408 FLOW IN GALLONS PER MINUTE HEAD IN METERS -600 -400 200 HEAD IN KILOPASCALS
Water (density = 1.94 slugs/ft³; kinematic viscosity = 0.000011 ft²/s), is pumped between two reservoirs through 400 ft of a 2-inch-diameter pipe and several minor losses (as shown below). The friction factor is 0.0015. The pipe material is structural steel. Given that the gravity acceleration constant = 32.2 ft/s². 21 = 20 ft Sharp entrance Screwed regular Sharp Z2 = 120 ft exit 90° elbow 12-in bend radius Pump Open globe valve 2 400 ft of pipe, d= ft 12 Half-open gate valve Minor loss coefficients: Sharp entrance: K = 0.5 Regular 90° elbow: K = 0.95 Open globe valve (2 in): K = 6.9 12-in bend: K = 0.15 Half-closed gate valve: K = 2.7 Sharp exit: K = 1 According to the performance curves (Model 1509) given below, which pump size shall be the most appropriate to be used in this water supply system in order to achieve a better energy efficiency? With this pump selection for the above system, what will be the efficiency? HEAD IN FEET Taco L/SEC 2,5 500 400 9:25 (235mm) 8.625"(219mm) 300 8.00 (203mm) 7.375"(187mm) 6.75"(171mm)' 200 100 CURVES BASED ON CLEAR WATER WITH SPECIFIC GRAVITY OF 1.0 50 Model 1509 FI & CI Series 7,5 +52% 3500 RPM November 1, 2010 10 12.5 15 17.5 Curve no. 2264 Min. Imp. Dia. 6.75" Size 2.5X 1.5 X 9.0 22.5 20 NPSH 200 -600 REQUIRED NPSH 56% 60% 62% 10HP(7.5KW) 64% 66% 64% 40HP(29.8KW) 60% 56% 48% 30HP(22.4KW) 25HP(18.6KW) 20HP(14.9KW) 15HP(11.2KW) 160 480 -120 -360 F80 -240 40 120 -0 -1000 100 -800 - 80 60 40 40 -20 100 150 200 250 300 350 408 FLOW IN GALLONS PER MINUTE HEAD IN METERS -600 -400 200 HEAD IN KILOPASCALS
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:Water (density = 1.94 slugs/ft³; kinematic viscosity = 0.000011 ft²/s), is pumped between two reservoirs
through 400 ft of a 2-inch-diameter pipe and several minor losses (as shown below). The friction factor is
0.0015. The pipe material is structural steel. Given that the gravity acceleration constant = 32.2 ft/s².
21 = 20 ft
Sharp
entrance
Screwed
regular
Sharp
Z2 = 120 ft
exit
90° elbow
12-in
bend radius
Pump
Open globe
valve
2
400 ft of pipe, d=
ft
12
Half-open
gate valve
Minor loss coefficients:
Sharp entrance: K = 0.5
Regular 90° elbow: K = 0.95
Open globe valve (2 in): K = 6.9
12-in bend: K = 0.15
Half-closed gate valve: K = 2.7
Sharp exit: K = 1
According to the performance curves (Model 1509) given below, which pump size shall be the most
appropriate to be used in this water supply system in order to achieve a better energy efficiency? With
this pump selection for the above system, what will be the efficiency?
Transcribed Image Text:HEAD IN FEET
Taco
L/SEC 2,5
500
400
9:25 (235mm)
8.625"(219mm)
300
8.00 (203mm)
7.375"(187mm)
6.75"(171mm)'
200
100
CURVES BASED ON CLEAR WATER
WITH SPECIFIC GRAVITY OF 1.0
50
Model 1509
FI & CI Series
7,5
+52%
3500 RPM
November 1, 2010
10
12.5
15
17.5
Curve no. 2264
Min. Imp. Dia. 6.75"
Size 2.5X 1.5 X 9.0
22.5
20
NPSH
200 -600
REQUIRED NPSH
56%
60%
62%
10HP(7.5KW)
64%
66%
64%
40HP(29.8KW)
60%
56%
48%
30HP(22.4KW)
25HP(18.6KW)
20HP(14.9KW)
15HP(11.2KW)
160 480
-120
-360
F80
-240
40
120
-0
-1000
100
-800
- 80
60
40
40
-20
100
150
200
250
300
350
408
FLOW IN GALLONS
PER MINUTE
HEAD IN METERS
-600
-400
200
HEAD IN KILOPASCALS
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