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Technical data
Installation and piping
To make the best use of the features of the UHN type, please follow the
items below.
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1.
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The pump sucks water in the axial direction. Be sure to install an inverse
U-bent pipe in the suction piping as shown in the figure below.
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2.
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The pump, being a self-priming type, does not require installation of a
foot valve or an intermediate valve in ordinary operating conditions. However,
if frequent operation or shorter self-priming time is desired, we recommend
installing such valves. The purpose is to keep as much water as possible
in the pump. The valve need not function perfectly and minor leakage will
not affect performance.
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3.
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If a gland packing is used for shaft sealing, we recommend installation
of an external flusher to prevent air from being sucked during self-priming
and to maintain efficiency of the gland packing.
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4.
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When the pump is started up, the water inside the casing is discharged
once into the discharge side before returning to the casing, and then stabilizes
after recirculation begins. If the discharged water floods the check valve
and the bent pipe, the amount of recirculating water becomes insufficient
and self-priming efficiency decreases. Therefore, be sure to install a
riser of the height shown in the figure below. For situations where the
riser is too long for installation, we can provide a short discharge pipe
(h2) which is made of the same material as the casing and has a special construction.
Please contact us for more details.
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5.
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Be sure to install a check valve on the discharge side of the pump. We
recommend the YOKOTA Non-Water Hammer Check Valve to prevent water hammer
due to reverse flow when pump operation is stopped. Particularly with parallel
operation, when one pump is stopped, it will be subject to back pressure
from the other pump, causing water hammer. The YOKOTA Non-Water Hammer
Check Valve can prevent water hammer even in such a situation. Further,
attachment of the YOKOTA No-Feed Detector (Optional) can prevent the pump
from dry operation.
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6.
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If the pumps are under parallel operation or if the actual pump head above
the check valve exceeds more than 1/3 of the shut off head, back pressure
acts on the check valve, making it difficult to exhaust air. Install an
exhaust valve to relieve such a situation. In this case, install a suitable
socket (refer to the table below) on the riser at the highest possible
position (refer to "J" in the figure below), and then install
the exhaust valve so that the opening end of its suction part is in the
center of the riser bore.
There may be water leakage from the exhaust valve. To prevent air from
being sucked when operation is stopped, install a pipe from the exhaust
valve to a point below the water level of the suction side.
For slurry liquid pumping, please contact us.
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Piping layout example 1.
Self-priming suction operation
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Attach the inverse U-bent pipe to the pump.
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Limit the extension of the inverse U-bent pipe (L) within 3m.
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Piping layout example 2.
Sealed tank (vacuum tank) extraction operation
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Piping layout example 3.
Self-priming suction operation with long horizontal pipe
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Attach the inverse U-bent pipe.
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Length of riser
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Length of riser
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h1 >= 200 + d + 5H (Total head of pump <= 50m)
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h1 >= 300 + d + 5H (Total head of pump > 50m)
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Where
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h1:
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Length of riser (mm)
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d:
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Discharge bore (mm)
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H:
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Total head of pump (m)
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Example:
UHN-0520 50mm x 0.3m3/min x 22m x 1750rpm x 3.7kW
h1 >= 200 + (50) + (5 x 22) = 360
Use a riser of over 360mm length, desirably over 500mm.
For slurry liquid pumping, please contact us.
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Exhaust valve
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Discharge pipe bore (mm)
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Valve bore
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40 - 80
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10A
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100-150
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15A
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200-250
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20A
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Flange
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Symbol
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Flange dimensions (JIS 10K)
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A (Bore)
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40
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50
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65
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80
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100
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125
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150
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200
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250
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D
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140
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155
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175
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185
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210
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250
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280
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330
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400
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C
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105
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120
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140
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150
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175
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210
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240
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290
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355
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n x h
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4-19
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4-19
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4-19
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8-19
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8-19
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8-23
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8-23
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12-23
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12-25
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Foundation bolt
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Bolt d
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d1
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S
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L1
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L
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M12
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12
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32
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50
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250
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M16
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16
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40
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63
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315
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M20
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20
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50
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80
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400
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M22
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22
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56
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90
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500
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Motor frame number and output power (Enclosed fan-cooling type)
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Pole number
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Frame number
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2P
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4P
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6P
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0.4
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0.4
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-
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71
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0.75
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0.75
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0.4
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80
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1.5
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1.5
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0.75
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90L
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2.2
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-
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2.2
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1.5
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100L
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3.7
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3.7
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2.2
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112M
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5.5
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5.5
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3.7
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132S
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7.5
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-
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7.5
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5.5
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132M
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11
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11
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7.5
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160M
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15
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18.5
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15
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11
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160L
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Pole number
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Frame number
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2P
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4P
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6P
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22
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18.5
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15
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180M
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22
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30
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30
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18.5
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180L
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22
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37
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37
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30
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200L
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45
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45
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37
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55
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55
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45
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225S
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75
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75
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55
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250S
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90
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90
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75
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250M
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110
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110
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90
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280S
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132
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132
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110
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280M
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150
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150
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132
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315S
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Bearing, Shaft seal
Bracket
number
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Gland packing
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Bearing
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Bearing seal
(in case of an oil seal)
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Lubricating oil
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Inner diameter x Outer diameter x Width
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Q'ty
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Pump side
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Coupling side
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Pump side
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Coupling side
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Oil amount L
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Type
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120
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28 x 44 x 8
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4
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6306
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6206
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TC28408
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TC28408
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0.28
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Turbine
oil
ISO
VG46
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130
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32 x 51 x 9.5
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4
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6307
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6207
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TC32458
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TC32458
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0.35
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140
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38 x 60 x 11
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4
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6308
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6307
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TC38558
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TC35508
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0.45
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145
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42 x 67 x 12.5
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4
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6309
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6308
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TC42609
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TC40559
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0.65
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155
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48 x 73 x 12.5
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4
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6310
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6309
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TC48659
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TC45609
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0.8
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165
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55 x 80 x 12.5
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5
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6312
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6311
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TC55729
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TC50689
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1.2
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170
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75 x 105 x 16
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5
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NU316
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6316
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TC7510013
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TC7510013
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1.6
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