HomeMy WebLinkAboutPROPANE TANK PAPERWORKt � ,
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8•' dome in black plastic or unite
galvanized steel.
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General Specifications
Conforms to the latest edition of the AS -ME code for
Pressure Ves", section VIg, VALLVVE Division 1. Complies with /-�j�,,
Aow+w -
V
NFPA 58. FLOAT
GAUGE �'csNODERated M250 psigfrom-2U° F. to 125° R All tanks maybe 6 ^ onmlEcnoN
evacuated to a full (14.7 psi) vacuum. � 'FILLER
VALVE
Vessel Finish: Coated tvifll epoxy red powder. ( Tanks coated ` Q v
tvifhthe epoxy powdermustbeburied).FGrAbovegrounduse,
tanks may be coated with TGIC powder. SERME1 IL-
MULT6rALVE NAME
Applicable federal, state or local regulations may contain --�-
specific requirements for protective coatings and cathodic aEUU E
Protection. The purchaser and Installer are responsible for
compliance with all federal, state or local regulations.
F,ITTINGs LAYOUT UNDER DOME
AGUG
h
WATER
CAPACrrY
OUTSIDE
DIAMETER
HEAD
TYPE
OVERALL
LENGTH
OVERAL
LEG
LEG
WEIGHT
QUANTITY
HEIGHT
WIDTH
SPACING
FULL PER
120 wg.
454.2 L
24"
Ellip
5' - 5 13/16"
31. 0"
10 118 °
1
3 0
245 Ibs.
LOAD sTAC
609.6 mm
1671.3mm
911.4 mm
257.2 mm'
914.4 mm
111.1 ka,
96 12
946 vrg.
46.3 L
31.5"
Hemi
7-2 112"
3' - 7 112"
12 3/4"
3' - 6°
472lbs.
63
3211wg.
800.1 mm2197.1
31.5"
mm
1104.9 mm
323.9 mm
1066.8 mm
214.1 kg.
9
1211.2 L
Bo0.1 mm
Hem!
8'.11 3/4°
T-7 112"
12 314"
4'-0 1/4"
588lbs.
45 9
500wg.
2736.9 mm
1104.9 mm
323.9 mm
1225.6 mm
266.7 kg,
1892.5 L
37.42"
950.5 mm
Hemi
9'-1Y.
4`-17/16"
15°
5..D.
8711bs.
30 6
2997.2 mm
1255.7 mm
391.0 mm
1524.0 mm
395.1 kg
1000wg•
37856 L
40.96"
H0"0.4
Hemi 15'-10 13/16"
4'.4 6116"
16 114"
9'-0"
17291bs,
15 6
n1m
?8--!6.6 mm
i394.0 mm
s12.0 inm
- -
?T ^
.� a� �..�.�
�.;
7P .3 ka
Rew Jan. 27.2016
Why Tanks Corrode
Underground steel tanks corrode due to an electrochemical reaction
between the tank and the surrounding soil. The process of corrosion
occurs due to small voltage differences on the steel surface that result
in the flow of DC current from one location to another. Where current
flows from the tank into the soil corrosion occurs. This location is called
the anode in a corrosion circuit. Where current flows from the soil to the
tank, no corrosion occurs. The progress of corrosion is determined by
the amount of current flov✓ing between the anode and the cathode and
whetherthe locations of the anode/ cathode remain constant overtime.
Corrosion rates are generally higher in wet soil environments since the
conductivity of the soil promotes the flow of DC current in the corrosion
circuit.
Corrosion generally exhibits itself on underground tanks In either a
general overall rusting or mare commonly, a pitting attack. Pit locations
may result from metallurgical conditions of the steel surface or soil
variations such as rocks, salts, fertilizer, moisture concentration, oxygen
concentration, etc.
Preventing corrosion
Protecting underground
tanks from corrosion is
'3 = easi(yachievedbytheuse
of two commonly applied
protection . methods:
c� = external coating and
cathodic protection.
These two methods
are complementary
and should be used in
conjunction with the
other. An effective
external protective
coating insulates the steel from the soil environment, thus preventing
theflowofcorrosion current from the anode tothe cathode, Aneffeciive
external coating can protect over 99%ofthe tanksurface area. However;
no coating is perfect, Damage from construction orsofl stresses create
tiny defects, which may result in accelerated corrosion atthe defect
Cathodic protection prevents corrosion at those defects by applying
DC current from an external source, forcing the ank to become
cathode. Application of sufficient DC current to the tankwill prevent any
corrosion from occurring. The two general types of cathodic protection
systems are sacrificial and Impressed current. Sacdricial systems are
used when the amount of current required for the protection Is small,
such as In underground propane tanks. Impressed current systems
are more commonly used for large structures such as large diameter
pipelines. Electrical isolation of the tank from metallic piping systems
and electrical grounds is critical for the cathodic protection system's
effectiveness.
Hour Sacrificial Cathodic Protection Works
Sacrificial systems work by creating a galvanic connection beivieen two
different metals. The most common anode material is magnesium,
which when coupled to steel results in DC current flow from the
magnesium to the steel. The open circuit potential of steel is about
-0.50 volts referenced to a copper sulfate electrode. The open circuit
potential of magnesium is about -1.55V to-1.80V. By connecting the
two metals together, the dtii-erence oft to 1.25Vvolts results in current
flow to the tank that overcomes the natural corrosion cells that exist on
the tank. With this current available to the tank, no corrosion occurs.
Magnesium Anodes
There are a variety of anode sizes and alloys used for cathodic
protection. The two primary alloys are designed as H-1 (or AZ63) and
High Potential. The H-1 alloy is produced from recycled magnesium
and has an open circuit potential of approximately-1.55V. This alloy
is well suited for protection of underground propane tanks. The High
Potential alloy is 991A pure magnesium having an open circuit potential
up to -1.8V, This alloy should be used for soil applications over 10,000
ohm -cm resistivity.
The two most common anode sizes used for underground propane
tanks are9lb, and 17lb. The size designation relates to the metal weight
10' of #12 TW insulated wire is attached to the anodes. Anodes are
then backrilled in a mixture of gypsum, bentonite, and sodium sulfate
to lower the electrical resistance of the anode to soil. The mixture is a
low cost, nonhazardous, electrically conductive backfill. The anode and
backriili is than packaged in a cotton bag and either a cardboard box or
paper bag. Actual shipping weight of these anodes with backfill is 27
lb. and 45lb.
Application Recommendations
Magnesium anodes can protect underground tanks in most soil
conditions. The H-1 alloy Is generallyveryeffactive. The following chart
providass¢eand quantftyrecommendations forvadous size tanks based
on conservative design assumptions. This chart covers soil conditions
up to 10,000 ohm -centimeter resistivity. Resistivides higher than
10,000ohm-centimeter generally represent very dry soils. Verification
of soil resistivity can be performed through soil analysis. Contact us
for design recommendations in locations where soil resistiv yes exceed
10,000 ohm -cm, or if there is no effective external coating on the tank.
The propane service line from the tank to the house also must be
considered in the cathodic protection design, unless ilia service line
is plastic. All underground steel pipe should be externally coated with
a corrosion resistant material. The service line should he electrically
isolated at the house wth an insulating fitting or union. If service pipe
Is less. than 50' In length, the tank anodes will provide sufficient current
to protect both tank and pipe. For longer lengths of pipe, an additional
anode may be required at the house connections.
If another metallic material such as copper is used for service piping,
the pipe should be electrically isolated from the tank at the fill pipe
connection. Copperandsteel create agalvanic couplethatwillaccelerate
corrosion of the steel tank when directly connected to ropper piping.
Generally, copper piping does not require cathodic protection.
'Based on 90% effective external coaUng, 2 m02 current density, and 30-
yearMode file.
Anode Installation
1. Determine size and quantity of•anodes from application chart.
2. When a single anode Is installed, it should be located near the
Lank center on either side of tank.
3. When multiple anodes are installed, space them evenly around
the tank. See examples below.
F1 anode 2 anodes
4.anodes
7�
4.Anodes are shipped In either cardboard boxes or multi -wall
papersacks. Remove outer container and bury the cloth bagged
anode. If anode is supplied in plastic bag, remove plastic bag
before Installing.
5.Install anodes approximately two to three feetfrom the tank and
at least as deep as the center line of the tank. Anodes work best
in locations with permanent moisture, so generally the deeper
the better.
6.After placing the anode, stretch out the anode connection wire
and extend overto a connection point on the tankfill pipe.
7. Cover the anode with approximately six inches of backii8 and
pour 5 gallons of water on the anode to saturate the prepared
backfill. Water is necessary to activate the anode.
B,Connect the anode wire to the tank with a low electrical
resistance connection. Examples are threaded stud on the
tank fill pipe or any accessible metallic connection point to the
tank All connections should be coated with a moisture -proof
material.
9. Ideally, the tank connection is made in the area of the tank fill
pipe within the covered dome. With access to the anode wire,
subsequent testing of the tank can include measurement of
anode output and verification of performance.
10.Verffy performance of the anode using an appropriate test
procedure.
Mechanical Connection tinder Dome
Cathodic Protection Testing Procedure
Equipment Needed: Digital Voltmeter, Red Test Lead Min.12' Long
& Black Lead Min, 2' Long, Reference Electrode (Copper/Copper
Sulphate Half -Cell)
STEP 1: Using a digital voltmeterinsertthe fed test lead into the Volt
Jack of the meter and select the 2 or 20 volt DC scale. Clip red test
lead connector to an uncoated metallic area of the tank, preferably
to the fill pipe multivalve. A good solid connection is very important.
(DO NOT connect to shroud).
STEP 2: Insertthe black test lead into the Common jack on the meter,
and connect the opposite end of the lead to a charged reference
electrode (h cell).
STEP 3: Remove protective cap from the porous plug at bottom end
of electrode. Place porous plug end into native soil (remove grass if
necessary) at four locations around the tank (one on each side of the
tank, and one at each end of the tank). If difficulty is encountered
obtaining readings, moisten soil with water or dig i4 cell deeper into
the soil. `
STEP 4: Record all four meter readings on an appropriate form. The
least of all four readings should be a minimum of-0.850v or more
negative. {Note: If any of the four readings are below (less negative)
-0.850v then the tank is not fully protected},
Charging Reference Electrode
STEP V Unscrew and remove porous plug end of new reference
electrode. Add deicnized or distilled water to the copper sulfate
crystals, filling electrode completely. The solution will turn blue In
color and there should, always be excess crystals at the bottom of
the tube. DO NOT USE TAP WATER.
STEP 2: Replace porous plug and of electrode and place in an upright
position so that the porous plug end Is facing in the down position
and let stand for 1 hour before use. This will allow the porous plug
to become completely saturated before use.
Cautlgu: Dono/allg[ve%trade to contact gll, road salts, ai othar
substances that nay cgotam/nate the sulutlon by, absoralion
through porous plug. Do not allow electrode to freeze.
Distributed ny:
Loss of pressure
Freeza-up inside the regulator.
This will prevent the regulator from regulating properly.
Regulator freeze -ups occur because there is excessive moisture
In the gas. Freeze -ups can also occur In pigtailsthat are kinked or
bent where free flow of the LP -Gas is restricted. These freeze -ups
can occur when the moisture, gas Now and temperature combine to
create a hazardous condition. Freeze -ups can occur at temperatures
above 32'F.
Action Required: All LP -Gas should be checked formoisture content
prior to delivery to consumers and proper amounts of anhydrous
methanoladded if the gas cannot be returned to the supplier. Any
container suspected of having excessive moisture should be treated
with the proper amount of methanol.
Customer safety
Since regulators are often used by consumers without previous
knowledge of the hazards of LP -Gas, and the LP -Gas dealers are the
only ones who have direct contact with the consumers.
IIt Is the dealer's responsibility to make sure that his I
customers are properly Instructed In safety matters relating
to their Installation.
At the very minimum, It Is desirable that these customers:
1. Know the odor of LP -Gas and what to do in case they smell
gas. Use the NPGA "Scratch 'n Sniff' leaflet
2. Are instructed to nevertamper with the system.
3. Know that when protective hoods are used to enclose
regulators and/or valves, that these hoods must be closed,
butnot locked.
4. Keep snow drifts from covering regulators.
S. Know the location of the cylinder or tank shut-off valve In
emergencies.
Underground Installations sl
Special hazards can occur if regulators am not properly Installed in i
underground systems. Water, dirt, mud and insects can get Into the ;
regulator If the bonnet cap is not tightly in place and the vent is not
protected with a proper vent tube, opening above any potential water j
level.
Most problems occur because the waterproof dome on the burled
storage lank does not extend above the ground level sumciently to
keep out water and mud.
Refer toNPGANo. 401. --------
Regulatorad us!ment dcsum
eup massbe dahc
Gmde ground duvmuerd and End orregulatcrvanl or vent tube
vay around housing dome. to be [..led above the hlghesl
Thisp:eventswater mlluoing po6oHe vslerleveL
do, into ws5nd'mg 2raeinches
amundd"u. �' minrmum
0inchesmWmum /
fiBindlesminrmomlf
subjectto veldagar ua rfid.
Note: Water mark left in housing dome at level
above regulator vent, or end of vent tube requires
replacement of regulator. Then correct installation.
General Warning
All RegO Products are mechanical devices thatwill eventually
become inoperative due to wear, contaminants, corrosion
and aging of components made of materials such as metal
and rubber. As a general recommendatfontRegulators should
be replaced In accordance with all of the recommendations
outlined in this safety warning. The recommended service
life of a regulator is one of many factors that must be
considered in determining when to replace a regulator. j
The environment and conditions of use will determine the safe
service life of these products. Periodic Inspection and maintenance
are essential.
Because RegO Products have a long and proven record of quality
and service, LP -Gas dealers may forget the hazards that can occur
because a regulator Is Ased beyond its safe service life. Life of a
regulator Isdetermined by the. environment In which it 'lives.- The
LP -Gas dealer knows better than anyone what this environment Is.
NOTE: There Is a developing trend In slate legislation and
in proposed national legislation to make the owners of products
responsible for replacing productsbefore they reach the end of their
safe useful life. LP -Gas dealers should be aware of legislation which
could affect them.
0
Njuju� 100 Rego nn. Jon. NO 27244 USA wa:¢re0opmduds.rmm +1(335) 449.7707
First Stage Regulator
with Relief Valve and
T re regulator Is truly the heart of an LP-Ges installation. It must
.Z-pansate for variations in tank pressure from as low asPSIG
�1 170 PSIG — and still deliver a steady flow of LP -Gas at 11" w.a.
consuming appliances. The regulator must dellver this pressure
:cspta a variable load from Intermit use of the appliances.
-cugh a single -stage system may perform adequately in many
rza�2ltons, the use of a iwg-stage system offers the ultimate in pin-
k, i=. t regulation. Two -stage regulation can result in a more profitable
i LP Gas operation for the dealer resulting from less maintenance and
installation callbacks — and there Is no better time than now for
'-slatting ReglO Regulators in two -stage systems.
;-{form Appliance Pressure
Ira installation of a two=stage system — one high pressure regulator
at the container to compensate for varied Inlet pressures, and one
v pressure regulator at the building to supply a constant delivery
reassure to the appliances — helps ensure maximum efficiency
a-d trouble -free operation year-round. It Is important to note that
r,,.Me pressure at the appliances can vary up to 4' w.c. using single -
stage systems, two-slage systems keep pressure variattons within
w.c. New high -efficiency appliances require this closer pressure
control for proper Ignition and stable, efficient operation. In fact one
Tajor manufacturer requires the use of two -stage systems with their
appliances.
Reduced Freeze-ups/Service Calls
Regulator freeze-up occurs when moisture in the gas condenses and
gazes on cold surfaces of the regulator nozzle. The nozzle becomes
chilled when high pressure gas expands across it Into the regulator
body. This chilling action is more severe in single -stage systems as
gas expands from tank pressure to 11' ive. through a single regulator
nozzle.
Size The System Correctly
Prior to Installing your hvo-slage system, be sure the system pipe
and tubing is properly sized. Proper sizing will help ensure constant
delivery pressure to the appliances during fluctuating loads at all
times.. Just as Important, be sure the RegO Regulators you choose
are capable of handling the desired lead. This Is another advantage
of two -stage systems — they are capable of handling much
more BTU'slhr. then single -stage systems. The Rego "LP -Gas
Seivi .Loran's rihanuol" providua ccru;•lo:o i;ifecm::Con ,:n pipe t&jng
and proper regulator selection.
d Stage
for
age Vent and
T Tap
j r—To Appliances/Furnace
Two -stage systems can greatly reduce the possibility, of freeze -ups
and resulting service calls as the expansion of gas from tank pressure
to 11' w.c. Is divided into two steps, with less chilling effect at each
regulator. In addition, after the gas exits the first -stage regulator and
enters the first -stage transmission line, it picks up heat from the line,
further reducing the possibility ofsecond-stagefreeze-up.
Service calls for pilot outages and electronic ignition system failures
are also reduced as a result of more uniform appliance pressure from
two -stage systems.
Economy of Installation
In a single -stage system, transmission line piping between the
containerand the appliances must be large enough to accommodate
the required volume of gas at 11" w.c. In contrast, the line between
the first and second stage regulators In two-slage systems can be
much smaller as It delivers gas at 10 PSIG to the second -stage
regulator. Often the savings In piping cost will pay for the second
regulator.
As an additional benefit, single -stage systems can be easily
converted to hvo-staga systems using existing supply lines when they
Prove Inadequate to meet added toads. This is the least expensive
and best method of correcting the problem.
Allowance for Future Appliances t
A high degree of flexibility is offered In new installations of two -
stage systems. Appliances can be added later to the present load —
provided the high pressure regulator can handle the increase— by the°
addition of a second low pressure regulator. Since appliances can be
regulated independently, demands from other parts of the Installation
will not affect their individual performances.
Replace Pigtails
If you are replacing an old regulator, remember to replace the
copper pfgtal. The old pigtarf may contain corrosion which can
restrict flow. In addition, corrosion may flake off and wedge
between the regulator orifice and seat disc — p,-eventing proper
lock -up.
MaqUIMEM3 Blass Mewmam WARRA AW61olvnsaV07-yes
First Stage Regulator
with Relief Valve and
Pressure Tap Second Stage
1 Regulator
with Large Vent
—� and Pressure Tap
r To AppliancesrFurtlacg
First Stage Piping
1
EMO
11111th no first stage relief valve,
propane liquid may form here...
i0'F. 120 PSIG 4D°F. 72 PSIG
Resulting In sudden pressure surge due to flashing Into vapor herel ag° F. 140 PSIG 5D° F. 65 PSIG
Firststage relief can prevent liquid from forming in first stage piping gg-F' 165 PSIG BD° F. 10&PSIG
during periods with no gas demand] I I
Pressure at which liquid can form
:at various temperatures.
Vapor Pressures of LIP -Gases
a
Temperature'F.
The Problem
Many modem LP -Gas appliances are equippedwith pilotless Ignition
systems. Water heaters and older appliances use pilot lights, but it
has become a common practice for energy conscious homeowners to
Shut-off the pilot when leaving home for extended periods of time. In
each instance, there Is no gas demand at all for extended periods.
The Consequences
If the first stage regulator tails to lock -up tight, usually as a result
of a wom seat disc or foreign material lodged between nozzle and
seat disc, pressure will build-up In the first stage piping — possibly
to a level that approaches tank pressure. Combining this with warm
ambient temperatures and cool ground, propane liquid may form In
the first stage piping.
When gas demand resumes, this liquid may pass through the second
stag? regulator Into the appk)ancss and furnace. NOTE — the second
M
stage regulator wit not relieve the pressure in first stage piping.'
The rapid vaporization of the liquid may cause a rapid pressure surge
that could seriously damage critical components of the appliance and
furnace controls. -
i A fire or explosion could occur as a consequence, i
The Solution
Rego LV4403 SeriesFirst Stage Regulators with Built -In Relief
Valves reduce the possibility of this serious hazard in two stage
applications. The bulk -In relief valve is designed to vent as needed
and reduce the possibility of firsf stage piping pressure from
becoming high enough to form liquid.
a #MMW jciR.gDDr.Scn.NC27244 USA vn•.w.mgopwducls.mm ♦1(336)44e-7707
.. Ideal for use as a first stage regulator on any domestic size ASIME or
DOT container In propane gas Installations requiring up to 1,500,000
BTU's per hour. The regulator is factory set to reduce container
pressure to an intermediate pressure of approximately 10 PSIG.
LV3403TR w Over Outlet
LV3•'03TRV9�FNPT I r/az' 10PSIG 1,SOD,DDO
, trsxirlum row basedun Wei praswre20 PSIGMgherlhanlhe regulator setting and de1erypwssae205, Icaar Plea
0m ratilersetling and ddimry pressure 2031 layer Man lhesening.
Provides accurate first stage regulation In hvo-stage bulk tank
systems. Reduce tank pressure to an Intormediats pressure of to 10
PSIG. Also used to supply high pressure human for applications like
Industrial furnaces or bolters. Also Incorporated In multiple cylinder
Installations.
LV49035R4 W F.-
' '5
.1-5
LV4403TR4 NPT �• F
10
5.10
LV44035R9 NPT
5
1-5
Yes 2,500,000
-- LV44DSTRO
10
5-10
LV4403:65 F. POL %,
• Lv4403TRDe F,NPT
10
5-10
' When used forfindstage pressure mntml, must dNerN�yprata miegral relief valve cr sepzrate r�relva shou,N ha spe�ad N occadance
v4N NFPAPamphlel 58.
„ Maximum rmv hasad on Inlet Fnlmara20 PSIG higher then the regulalcr selling
and darn^..ypressum 205S lewcr lhnn the seNnp.
Designed to reduce first stage pressure of 5 to 20 PSIG down to rge.
bumer pressure, normally 11' w.c. Ideal for medium commercial
installations, multiple cylinder Installations and normal.clomestilt;
loads.
LV44031340 y^ F NPT ii` w.c. at
LV44031346W 1 10 PSIG 0'to 13' Over Inlet
I.V4403006 W F. NPT Drtil Inlet
NO F. NPT
PSIG Ieisl and T W..o. de •erypressum
935.000
:039®3TiR
LV44039eries
tV3403SSexies
_J` �3Qr7 ca
(bused on 1a25peclfic
7073
720
571
7391
934
740
7983
1331
1054
3563
2391
1894
4724
-3247-
-2603-
10063
6755
5357
id Petroleum Gas
In. We
Maximum Capacity of PC Pipe In Thousands of BTU per Hour of Liquefied Petroleum
With a Gas Pressure of 2.0 psi and a Pressure Drop of 1A psi
(based on a 1.0 soeclac aravnv oast
71300
7586
6008
• 5092
4479
4033
3418
3007
14652
9835
7790
6602
5807
6229
4432
3898
20877
14014
71700
9408
8275
7451
6315
5555
37514
25183
19946
76905
14869
13389
11348
9982
43429
29848
23969
20515
18182
16474
14100.
12496
05963
71131
56339
47760
42000
37820
32054
28194
44
42
40
67
54
52
81
78
75
146
140
134
233
224
216
411
394,
379
2576BTUh=i
CFH
Gas
2295
2744
2078
1775
2975
2780
2617
2302
4239
3962
3729
3280
7618
7119
6700
5894
9691
9092
8589
7672
27517
20709
18926
76647
7355
7757
1192
7073 No 800 720 659 611
571
537
608
484
462
4
/4
25M
1545
2202
7397 1179 1037 934 855 792
1983 76BO 1478
740
696
659
627
699
574
557
4498
3956
1331 1218 1128
3563 3019 2656 2391 2189 2027
1054
1894
992
1783
939
893
. 853
878
766
6903
6232
4740 4057 3596 3258 2997 2786
2676
2471,
1688
2347
1605
2239
1533
2144.
1469,
2060
1472
1985
72705
17175
70063 8529 7502 6755 6782 5725
5350
5036
4767
4535.
4331
4150
3988
Maximum Capacity of PEPipe In Thousands cIM U
per Hour of Liquefied Petroleum Gas6768ruh=lcFH
With a Gas Pressure of 10.0 psi and a Pressure Drop of
1.0 psi
(bused on a 1.62 waclso 0=11v oasb
14234
9555
756E
6474
5642
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10423
9385
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6997
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5766
6340
47252
31720
25123
21293
18729
16B65
14294
12672
17327
10361
9595
53969
37087
29782
25489
22591
20469
17579
15527
74068
12943
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47640
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27104
'. 1707
1501
1352
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1946
7753
74B5
3153
273
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4487
3803
7334
6500
5890
5041
160N
14077
12576
10743
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