1. HITACHI OIL FREE SCREW
NEXTseries WATER COOLED TWO STAGE
DSP 132～160kW
～
DSP 200～240kW
～
Comparison Material

2. Performance
Manufacturer - HITACHI DSP Competitor A
Output Wk 132 145 160 200 132 145 160 200
Catalogue value
Discharge Pressure aP M 0.75 0.75 0.75 0.75 0.69 0.69 0.69 0.69 .tnereff d s erusser P deta R
i i
Capacity n m/3 m
i 23.4 26.0 28.5 37.0 23.8 26.3 28.3 36.3 ecna mrofrep egakcap lato T： H
dna sso erusserp gn du cn to N： A
l i l i
ed s no tcus ta es r erutarep met
i i i
Shaft input Wk 138.6 152.3 168.0 220.0 129.8 142.3 156.3 199.9 ed s egrahcs d ta sso erusserp gn du cn to N
i i l i l i
i C lI
）α- yt capa （℃03 te n
↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓
Comparison at sam condition
e
Discharge Pressure 0.69 0.69 0.69 0.69 0.69 0.69 0.69 0.69
Capacity n m/3 m
i 23.4 26.0 28.5 37.0 23.0(-α ) 25.4(-α ) 27.3(-α ) 35.0(-α ) ）no tp muss（ ℃5=s TΔ a Pk2=s PΔ A
i a , ：
Shaft input (Main motor) Wk 132.4 145.4 160.4 210.1 131.7 144.4 158.6 202.9 ）no tp muss（ a P M20 0=d PΔ A
i a . ：
Shaft input (Auxiliary motor) Wk 0.4 0.4 0.4 0.4 1.5 1.5 1.5 1.5
Total shaft input Wk 132.8 145.8 160.8 210.5 133.2 145.9 160.1 204.4
Specific power ) n m / 3 m / Wk
i ( 5.674 5.608 5.644 5.689 5.805 5.753 5.867 5.838
100% 100% 100% 100% 102.3% 102.6% 104.0% 102.6% egatnavda ％0 4～3 2 ： hcat H
. . i i
Power consumption at unloading
Shaft input (Main motor) Wk 26.3 28.9 31.9 41.8 36.3 39.8 43.8 56.0
Total shaft input Wk 26.7 29.3 32.3 42.2 37.8 41.3 45.3 57.5 re wop l a ms: hcat H
l i i
100% 100% 100% 100% 141.6% 141.0% 140.0% 136.2%
2

3. Performance
Manufacturer - HITACHI DSP Competitor A
Output Wk 132 145 160 200 132 145 160 200
Catalogue value
Discharge Pressure aP M 0.75 0.75 0.75 0.75 0.69 0.69 0.69 0.69 .tnereff d s erusser P deta R
i i
Capacity n m/3 m
i 23.4 26.0 28.5 37.0 23.8 26.3 28.3 36.3 ecna mrofrep egakcap lato T： H
dna sso erusserp gn du cn to N： A
l i l i
ed s no tcus ta es r erutarep met
i i i
Shaft input Wk 138.6 152.3 168.0 220.0 129.8 142.3 156.3 199.9 ed s egrahcs d ta sso erusserp gn du cn to N
i i l i l i
i C lI
）α- yt capa （℃03 te n
↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓
Comparison at sam condition
e
Discharge Pressure 0.69 Characteristic0.69Perform
0.69 0.69 of ance 160kW class)
0.69 （0.69 0.69 0.69
Capacity n m/3 m
i 081
23.4 26.0 28.5 37.0 23.0(-α ) 25.4(-α ) 27.3(-α ) 35.0(-α ) ）no tp muss（ ℃5=s TΔ a Pk2=s PΔ A
i a , ：
Shaft input (Main motor) Wk 132.4
061 145.4 160.4 210.1 131.7 144.4 158.6 202.9 ）no tp muss（ a P M20 0=d PΔ A
i a . ：
Shaft input (Auxiliary motor) Wk 0.4 W 0.4 0.4 0.4 1.5 1.5 1.5 1.5
Total shaft input Wk 0 4 1k
132.8 145.8 160.8 210.5 133.2 145.9 160.1 204.4
（
Specific power ) n m / 3 m / Wk
i ( 5.674
0 2 1t
u Competitor A5.805
5.608 5.644 5.689 5.753 5.867 5.838
p
100% n 100% 100% 100% 102.3% 102.6% 104.0% 102.6% egatnavda ％0 4～3 2 ： hcat H
. . i i
0 0 1i
t
f
Power consumption at unloading 08 a h
s HITACHI DSP
Shaft input (Main motor) Wk 26.3 28.9 31.9 41.8 36.3 39.8 43.8 56.0
06 l a
Total shaft input Wk 26.7 t
o 29.3 32.3 42.2 37.8 41.3 45.3 57.5 re wop l a ms: hcat H
l i i
04 T
100% 100% 100% 100% 141.6% 141.0% 140.0% 136.2%
02
0
0 5 02 51 01 52 03
)n m/3 m( yt capa C
i i
3

4. Dimensions
HITACHI DSP 160kW Competitor A 160kW
Starter is installed in the package.
Starter is installed in the package. External starter
is required.
1925 1850
2500 2700
1600 1565
HITACHI DSP
Model Dimensions(m )
m 2
Footprint (m ) Volum
3
e(m ) Weight(kg)
(kW) W D H A= 100% A=100% A= 100%
132 2500 1600 1925 4.00 106.5% 7.70 110.8% 3800 107.2%
145 94.7% 98.5% 86.4%
160 94.7% 98.5% 86.4%
200 2800 1800 1950 5.04 119.3% 9.83 109.0% 4800 92.1%
240 107.3% 98.1% 81.8%
Competitor A
Model Dimensions(m )
m
Footprint(m )
2
Volum
3
e(m ) Weight(kg)
(kW) W D H
132 2400 1565 1850 3.76 6.95 3545
145 2700 1565 1850 4.23 7.82 4400
160 4440
200 2700 1565 2133 4.23 9.01 5210
250 3000 1565 2133 4.70 10.01 5870 4

5. Screw rotor
HITACHI DSP Competitor A
●Coating：Teflon free
： ● Coating：Containing Teflon
：
●Material of rotors：Stainless steel
： ● Material of rotors：Carbon steel
：
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6. Structure of Intercooler and Aftercooler
HITACHI DSP Competitor A
Casing for cooler
●Air in copper tubes
●Air in copper tubes ●Air in aacast iron cooler casing
●Air in cast iron cooler casing
● HITACHI : No rust is occurred in copper tubes.
● Competitor A: Aftercooler might be clogged by the rust which is occurred by
drain back flow in the cast iron cooler casing.
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7. Oil fume remove system (1/2)
HITACHI DSP Competitor A
【Standard】
】 【Standard】
】
OMR
Breather
Ejector Gear casing
● HITACHI: 99.99% oil fume is removed by OMR.
● Competitor A: If the filter is clogged,internal pressure of gear casing is increased
and oil might enter the air end.
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8. Oil fume recovery system (2/2)
HITACHI DSP Competitor A
【Standard】 【Option】Electric dust collector
1.99.99％ oil fume can be removed 1.NOT original technology
2.Patented original design and structure 2.Only 99% oil fume can be removed.
3.No need to top up the oil (but must change following manual) 3.Less performance with oil spot on the
4.The reliability of Shaft seal is increased because of the electrode
negative pressure in the gear case. 4.Pay attention for high voltage
5.No effect for shaft seal
Ejector：Maintain the
negative pressure in
Remover Element the gear casing
High voltage
electrode
Float Trap (send the collected oil)
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9. Shaft Seal (1/3)
HITACHI･･･
･･･Visco type seal＋Air seals
･･･ ＋
Competitor A･･･
･･･Visco type seal＋Stainless seal
･･･ ＋
The precisely grounded low friction high durability carbon + stainless steel holder ring air
seals are used to prevent the compressed air from leaking out of the compression chamber.
The brass, internal square grooved visco-type seals are used to prevent the oil that
lubricates the gears and bearings from entering the compression chamber. The visco-type
seals generate a positive pressure to push the oil fumes back to the gear case.
Rotor side Bearing side
Air seals Vent hole Visco-type seal
9

10. Shaft Seal (2/3)
HITACHI DSP Competitor A
Air out
Vent hole
Air in
Vent hole
2 small vent holes
Large diameter vent hole
The number of the vent hole is NOT a point of shaft seal function !
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11. Shaft Seal (3/3)
HITACHI DSP Competitor A
Air end
Air End
Oil piping
for
shaft seals
Oil pan for
Vent hole shaft seals
No oil pan is required on HITACHI Oil pan is required because of oil leak
DSP because of high durability of from shaft seals.
shaft seals.
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12. ＥＮＤ
ＥＮＤ
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