Low Pressure Transfer
Pumps for CO2
MC3SS bareshaft
MC3SS on base
plus motor
The liquid CO2 transfer pumps manufactured by Smith
The recommended shaft seal assembly contains a
Precision Products of California are designed for moving
‘Superseal’ sealing ring, which minimises seal wear. This
large quantities of bulk carbon dioxide between two low
‘Superseal’ option on the pump is denoted by the addition
pressure vessels, where the differential pressure does not
of the letters ‘SS’ after the pump model number, e.g.
exceed 4.8 bar, typically between a road tanker and a
Smith pump MC2SS.
CO2 bulk storage tank. The complete range includes
Many of the Smith pump models are reversible, avoiding
pumps with CO2 transfer capacities between 0.5 te/h and
the need for cumbersome loading and discharge pipework
35 te/h.
arrangements. The inlet and outlet ports on the standard
The Smith pumps use precision-cut, interlocking gears to
pumps have NPT female threads, although bodies with
propel the liquid carbon dioxide. The gears are lubricated
flange connections can also be supplied.
by the liquid CO2 and hence run oil free. The shaft seal
Pumps can be supplied with or without motor, baseframe,
assembly which turns the drive gears is connected directly
by means of a coupling to the electric motor and can be
run at speeds of up to 1800 rev/min, although a slower
coupling and separate by-pass valve, if required. Special
versions of the pumps are available for nitrous oxide
service or heavy duty applications.
running speed is recommended to prolong pump life.
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Tel: +44 (0)1675 468837 Fax: +44 (0)1675 467022 Email: [email protected]
23017012
MC1 motor mount
MC1 foot mount
Smith CO2 Transfer Pump Model Specifications
Model
RecomRecomDifferential
mended
mended
Pressure
Motor Size Coupling
(bar)
Size
(kW)
MC1SS
MC1044SS
MC1044HSS
MC2SS
MC3SS
MC4SS
MC5SS
Port Size
Threads
Reversible
NPT
Female
(inch)
Net
Weight
Pump
Only
(kg)
Recommended
By-pass
Valve
By-pass
Valve
Threads
NPT
Female
(inch)
0
1.4
3.5
0.55
0.55
0.55
VC-20
3/4
No
9
WW 120
1/2
0
1.4
3.5
1.1
1.1
1.5
VC-35
11/2
Yes
23
WW 100
1
0
1.4
3.5
1.1
1.1
2.2
VC-35
11/2
Yes
23
WW 100
1
0
1.4
3.5
2.2
2.2
4.0
VC-35
VC-35
VC-40
21/2
Yes
34
WW 114
11/4
0
1.4
3.5
4.0
4.0
5.5
VC-40
21/2
Yes
45
WW 112
11/2
0
1.4
3.5
5.5
5.5
7.5
VC-40
VC-40
VC-50
Inlet 4
Outlet 21/2
No
61
WW 200
2
0
1.4
3.5
7.5
7.5
11.0
VC-50
Inlet 4
Outlet 21/2
No
77
WW 212
21/2
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Tel: +44 (0)1675 468837 Fax: +44 (0)1675 467022 Email: [email protected]
23017012
Smith Pump Transfer Capacities
Pump Type
MC1SS
Actual
Differential
Shaft
Pressure
Speed (rpm)
(bar)
700
0
900
0
1400
0
700
1.4
900
1.4
1400
1.4
700
3.5
900
3.5
1400
3.5
Actual
Capacity
(kg/h)
449
577
898
384
513
834
287
416
737
Pump Type
MC3HSS
Actual
Differential
Shaft
Pressure
Speed (rpm)
(bar)
700
0
900
0
1400
0
700
1.4
900
1.4
1400
1.4
700
3.5
900
3.5
1400
3.5
Actual
Capacity
(kg/h)
10778
13858
21556
9485
12564
20263
7545
10624
18323
MC1SS4444
MC1044SS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
1796
449
2310
577
3593
898
1538
384
2051
513
3334
834
1150
287
1663
416
2946
737
MC1SS4444
MC4SS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
13473
449
17322
577
26945
898
11533
384
15382
513
25005
834
8623
287
12472
416
22095
737
MC1044HSS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
3144
4042
6287
2691
3589
5835
2012
2910
5156
MC4HSS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
16167
20786
32334
14227
18846
30394
11317
15936
27484
MC2SS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
4491
5774
8982
3844
5127
8335
2874
4157
7365
MC5SS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
17964
23096
35927
15377
20509
33340
11497
16629
29460
MC2HSS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
5389
6929
10778
4742
6282
10131
3772
5312
9161
MC5HSS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
21556
27715
43113
18970
25129
40526
15089
21248
36646
MC3SS
700
900
1400
700
900
1400
700
900
1400
0
0
0
1.4
1.4
1.4
3.5
3.5
3.5
8982
11548
17964
7688
10255
16670
5748
8315
14730
Capacities listed assume inlet conditions
are as recommended and will vary with
liquid CO2 temperature.
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Air Liquide UK Limited Marketing Department, Station Road, Coleshill, Birmingham B46 1JY. England.
Tel: +44 (0)1675 468837 Fax: +44 (0)1675 467022 Email: [email protected]
23017012
Smith CO2 Pump Options
MC5SS on base
plus motor
High Capacity
Pump Connections
Pump life can be considerably extended by the use of the
Standard Smith CO2 pumps feature an ANSI standard
high capacity (‘H’) range of pumps operated at a reduced
female NPT thread connection. Installation must be made
speed. Utilising a larger gear set the pump can achieve
with a compatible sealant to produce a pressure tight joint.
required transfer rates at lower speeds. In addition to a
reduction in noise levels, operating the pump at half the
recommended speed can extend the life of the pump by
An option is available to provide either screwed or butt
weld companion connection which may improve access
for maintenance.
up to three times.
Continuous Duty
Standard Smith CO2 pumps are designed for intermittent
duty and generally should not be operated for more than
Nitrous Oxide Service
As bulk nitrous oxide exhibits similar characteristics to
carbon dioxide, a range of Smith pumps are offered for
this duty.
two hours at any one time.
Alternative materials of construction are used in the shaft
Special pumps (NSSA Option) are available for use in
installations requiring extended operating periods (for
example in continuous re-circulation) or where higher than
normal differential pressures are encountered. In these
seal assemblies and an oxygen compatible casing sealant
is used rather than the Teflon based version used for CO2
pumps. All components are dry machined and are subject
to a special cleaning process.
cases a larger pump running at a lower speed would be
recommended to maximise pump life.
Pumps specially manufactured for this service have a very
limited shelf life even if left in the original factory crate or
The NSSA option features gear sets made from aircraft
quality steel (Nitralloy 135MOD) hardened with a special
carton. Pumps must be put into service within two months
of manufacture.
nitriding process to provide a very hard wearing surface.
Special Tungsten Carbide idler gear shafts are fitted to
provide rigidity under high load conditions.
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Air Liquide UK Limited Marketing Department, Station Road, Coleshill, Birmingham B46 1JY. England.
Tel: +44 (0)1675 468837 Fax: +44 (0)1675 467022 Email: [email protected]
23017012
Smith CO2 Pump Ancilliaries
By-pass Valve
By-pass Valves
The Smith by-pass valve can safely control and limit
excessive differential pressure without cavitating the
pump. A by-pass valve properly installed provides a safe
automatic product return through a separate circuit which
allows generated heat and vaporisation to dissipate before
the liquid CO2 passes once again to the pump inlet.
All Smith by-pass valves incorporate a unique flow plate to
evenly dissipate flow when the valve opens. This
eliminates chatter and minimises overpressure even at
higher flow rates. The valve is designed for continuous
flow applications and can be used to meter flow if desired.
Each valve is adjustable for a differential pressure of
between 1.7 bar and 8.6 bar. Unless otherwise specified
valves are factory set at 2.75 bar.
Valve Selection Table
By-pass
Valve
WW 120
Port Size NPT/API
Female (in)
1/2
x 1/2
Weight
(kg)
Rated Capacity
(kg/h)
Pump
4
2300
MC1SS
WW 100
1x1
5.35
8000
MC1044SS
WW 114
11/4 x 11/4
5.35
11500
MC2SS
WW 112
11/2 x 11/2
11.40
23000
MC3SS
WW 200
2x2
11.40
34600
MC4SS
WW 212
21/2 x 21/2
10.70
57000
MC5SS
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Air Liquide UK Limited Marketing Department, Station Road, Coleshill, Birmingham B46 1JY. England.
Tel: +44 (0)1675 468837 Fax: +44 (0)1675 467022 Email: [email protected]
23017012
Smith CO2 Pump Ancilliaries
Couplings
Couplings
Flexible drive couplings are used for Smith CO2 pumps
whether mounted on steel baseframes with motors or
engines or for pumps mounted directly onto electric
motors. Recommended couplings consist of two metal
flanges and one flexible rubber vibration damping insert
disc. Custom sized bores for metric and unusual motor
shaft sizes can be supplied on request.
Couplings Fitted to Standard Installations
Part No.
Coupling
Insert No.
Pump
Motor Size (1500 rpm)
Standard Bore Diameters
(in)
(hp) (kW)
5/8, 3/4
VC20
FD20
MC1SS
0.5
0.55
2226.1360
VC35
FD35
MC1044SS
7/8,
1, 11/8
2
1.5
2226.1360
VC35
FD35
MC2SS
7/8,
1, 11/8
3
2.2
2226.1361
VC40
FD40
MC2SS
1, 11/8, 11/4, 13/8
5
4
2226.1361
VC40
FD40
MC3SS
1, 11/8, 11/4, 13/8
7.5
5.5
VC50
FD50
MC4SS
1, 13/8, 15/8
10
7.5
VC50
FD50
MC5SS
1, 13/8, 15/8
15
11
NOTE: There is an additional charge for couplings with non-standard or metric-sized bores.
Table to Select Correct Coupling related to hp and rpm
hp of
Motor
rpm of
Motor
Coupling
hp of
Motor
rpm of
Motor
Coupling
11/2
1500
1000
750
VC-30
VC-35
VC-35
71/2
1500
1000
750
VC-40
VC-50
VC-50
2
1500
1000
750
VC-35
VC-35
VC-40
10
1500
1000
750
VC-50
VC-50
VC-50
3
1500
1000
750
VC-35
VC-40
VC-40
15
1500
1000
1500
VC-50
VC-50
VC-50
1500
1000
750
VC-40
VC-40
VC-50
5
20
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Air Liquide UK Limited Marketing Department, Station Road, Coleshill, Birmingham B46 1JY. England.
Tel: +44 (0)1675 468837 Fax: +44 (0)1675 467022 Email: [email protected]
23017012
Smith CO2 Pump Ancilliaries
Strainers
Big Hex for
easy wrenching
Strainer Body Ductile Iron
34 bar working pressure
Narrow Guide Vane,
does not restrict flow
INLET
Accurate, lathe-cut pipe
threads, no leak problem
OUTLET
Heavy steel
flange
Positioning groove
for screen
Tapered screen seat
Taper in strainer body –
guides screen into proper
position
1/4 in plugged hole for
installation of blow-off
valve if desired
O-ring groove
& O-ring
Perforated metal screen cage, seam welded with
wire mesh screen inside. Soldered at both ends
High-tensile steel bolts with hex heads
With a maximum allowable working pressure of 34 bar the
A
Smith strainer is perfectly suited to remove particulate
matter in the inlet of Smith CO2 pumps.
INLET
OUTLET
Pipe Size
Pipe Size
Improved safety and reduced costs can be achieved by
the use of strainers with reducing sizes eliminating extra
fittings or bushings.
The screen is very easy to replace due to the exclusive
C
narrow guide vane and a taper in the strainer body. The
screen glides easily into position preventing breakage or
buckling which otherwise could allow foreign matter to
pass through. The reinforced mesh screen provides
B
superior efficiency compared with inferior perforated metal
screens. Screens are available in either brass 40 mesh or
300 series stainless steel 80 mesh.
Specification
Pipe Sizes (NPT/API)
Strainer Type
No.
Inlet (in)
Outlet (in)
W-1
W-1B-100
W-1
W-1
W-1
W-1B-112
W-2
W-2B-200
W-3
W-3
W-3
1
1
11/4
11/4
11/4
11/2
2
2
21/2
3
3
3/4
1
3/4
1
11/4
11/2
11/2
2
21/2
21/2
3
A
(mm)
B
(mm)
C
(mm)
162
162
162
162
162
162
208
208
260
260
260
178
178
178
178
178
178
228
228
286
286
286
114
114
114
114
114
114
168
168
191
191
191
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Air Liquide UK Limited Marketing Department, Station Road, Coleshill, Birmingham B46 1JY. England.
Tel: +44 (0)1675 468837 Fax: +44 (0)1675 467022 Email: [email protected]
23017012