ari short agriculture seminar
TRANSCRIPT
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AIR VALVES - TheAIR VALVES - TheEfficientEfficientFlow ControllersFlow Controllers
In AgricultureIn Agriculture
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1. Introduction to Air/Wter.
!. "ow Air gets into #i#elines.
$. %isd&ntges of Air#resence in #i#elines.
'. %isd&ntges of Air (sence in #i#elines.). *eh&ior of Air in #i#es.
+. The #ur#ose of Air Vl&es.
,. The (sic o#ertion of n Air Vl&e.. The three (sic t#es of Air Vl&es
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. "ow the different t#es of Air Vl&es wor0.
1. Choosing nd locting Air Vl&es in Agriculture
11. A.R.I.2s Air Vl&es.
1!. A.R.I. 3ln 1.1Air Vl&e Si4ing nd Loction3rogr5.
1$. Conclusions nd %iscussions.
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VISCOSITY
Pressures along a horizontal tube in which flows
(a) an ideal fluid (b) a !iscous fluid
(a)
(b)
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oC Castor Oil "ater #ir
Centi$oise Centi$oise Centi$oise
0 5,300 1.792 0.00171
20 986 1.005 0.00181
40 231 0.656 0.0019
60 80 0.469 0.002
80 30 0.357 0.00209100 17 0.284 0.00218
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Air nd 67gen Solu(ilit in Wter
0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Te5#erture 8deg. Cent.9
Volu5etricco
ncentrtion
83ercent9
Air Concentration Oxygen Concentration
airhmhm %&'1&&&%21*++
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1 Vacuu, enhanced $roble,s andda,ages-
a Suction of ,ud and dirt through
dri$$ers and tric.lers
b Suction of seals and gas.ets in/line
dri$$ers and tric.lers and otherinternal accessories of $i$es into the
$i$elines
c 0ncontrolled suction of inected
che,icals or fertilizers into the
sste,2 Pi$e or accessor colla$se do to sub3
at,os$heric (negati!e) $ressures
+ In so,e cases the absence of an air
cushion can increase the da,ages of surge
and sla, $heno,ena
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engbehaviour
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Critical Velocit 4e5uired for Trans$orting #ir 6ubbles (,etric)
2"
3"
4"
6"
8"
10"
12''
14"
16"
18"
20"22"
24"
28"
&7
&'
12
1*
2&
27
2'
&&(&
1&(1 1 1
&
8own 3 Slo$e of Pi$e (,%,)
CriticalVelocit2(,%s)
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ENGLOCATION
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CRITICAL VELOCITYCRITICAL VELOCITY
FOR THE TRANSPORT OF AIR BUBBLESFOR THE TRANSPORT OF AIR BUBBLES
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9u,ber of 6ara. 83&7& #ir Val!es 9eeded :or Pi$e :illing#s 8eter,ined b :ill Velocit
( #t &* bar('* $si) deferential $ressure)
0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3
9u,ber of 6ara.s 4e5uired
:illVelocit2,%sec
12 inch1& inch' inch* inch7 inch2 inch
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9u,ber of 6ara. 83&7& #ir Val!es 9eeded :or Vacuu, Protection
#s 8eter,ined b Pi$e dia,eter and Slo$e(at &7 bar (' $si) differential sub3at,os$heric $ressure)
0
5
10
15
20
25
30
35
40
45
50
0 1 2 3 4 5
9u,ber of Val!es 4e5uired
Slo$eofPi$ein;
12 inch
1& inch
' inch
* inch7 inch2 inch
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Nu!er o #uar$ean% &euire$ or (acuu )rotectionaccor$ing to !ur%t ana*y%i% at 5.8 +%i negatie +re%%ure
2" 4"6"
8"
10"
12"
0
10
20
30
40
50
0 1 2 3 4 5
Nu!er o" #uar$ean% &e'uire$
-*o+e
o")i+e
in
+ercen
t
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Nu!er o" #uar$ean% &e'uire$ "or (acuu )rotection accor$ing to !ur%t ana*y%i% at 5.8 +%i negatie +re% %ure
0
50
100
150
200
250
300
350
400
0 1 2 3 4 5
Nu!er o #uar$ean% &euire$
-*o+e
o")i+e
in
)erce
nt
2" 4" 6" 8" 10" 12"
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ENGBUTH
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#4I S?#=CONCET T!A"ITIONAL
ENGNE#CONCET
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Orifice 8ia,eter @ 1 s5 ,, Orifice 8ia,eter @ 12 s5 ,,
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1c,
Ac,
#4I Sege!
Classic S,all Orifice #ir Val!e
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9ew9ew6ara.6ara.
11BB
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Su$$l ead with 6ara.sSu$$l ead with 6ara.s
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Su$$l ead with 6ara.sSu$$l ead with 6ara.s
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:I=T4#TIO9
SYST?DS
4?V?4S?
OSDOSISENGIC2
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#4I #ir#4I #ir
Val!es onVal!es on
:ilter:iltereads ineads in
ondurasonduras
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I84O
?=?CT4IC
PO"?4
ST#TIO9
:O48 DOTO4S
"#T?4
T4?#TD?9T3
D?EICO
ENG
IC4
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IrrigationIrrigation
#ir Val!e#ir Val!e
Setu$sSetu$s
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IrrigationIrrigation
#ir Val!e#ir Val!e
Setu$sSetu$s
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SECCION GASTO(lps)TIEMPO(h:m)
I
II
III
IV
V
VI
VII
VIII
AREA (ha)
27.7 61.8 5 hrs ! m"#
$
I$
TOTA%
25.&
27.
56.5
61.!
5hrs!m"#
5hrs!m"#
721.2281'&2'8& 22hrs1!m"#
81'&2'8&ha81'&2'8&ha
Papaa&.!
Ca#alElr*+r",-,r-,r"pII
&.6 lph
1.5 M.5 M218! lps
Trs
6!!.8 mm/h-ra
''''''
.5 mm/,"a5.6 h-ras
0"ar"-
Trs5.6 h-ras
61lps
6.! /3m2
Mallasa+4-m4"3- 2A8!6I#34-r V#4+r"&8mm
17h-rasapr-
1!.!m3a
1.! m3a
1.! m3a15.8m3a
5.! m3a
19.!m3a
57m.3.a.
S"m:-l-25a
T+- s3+#,ar"-
"l4ra3"# s3+#,ar"a
0"r33"# ,la ra#4
Nmr-, s33"#+#4 , a as43"m"#4-
Vl;+la , s33"-#am"#4-
Cr+3r-
C+r;a , #";l
Vl;+la ,al";"-Vl;+la ,a"r
T+ra
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