Cylinder Speed

This chart will help you calculate the time required for an Enerpac cylinder to lift a load when powered by a 10,000 psi Enerpac hydraulic pump.
The Cylinder Speed Chart can also be used to determine the pump type and model best suited for an application when you know the plunger speed required.

To determine:

Cylinder plunger speed
An RC-308 cylinder (30 ton) is powered by a 5-Series Hushh pump. While lifting the load, the cylinder plunger will require 3.2 seconds to travel 1 inch. While extending towards the load, the cylinder plunger travels at .61 sec/in.

   To determine:

Best matching pump
Your 30 ton cylinder needs to move a load at a speed of 6.50 sec/in. Simply go down from the top of the chart, to the value of 6.50 sec/in. Then follow the chart to the right to find that the 3-Series Hushh pump or ZU4 series is most suitable for your application.

Number of Pump Handle Strokes per Inch of Cylinder Plunger Travel
Cyl Capacity
5 t 10 t 15 t 25 t 30 t 50 t 75 t 100 t  Pump Type
Power
 Source
No Load Load No Load Load No Load Load No Load Load No Load Load No Load Load No Load Load No Load Load
Manual 7  7 15
 15
 21
21
 34 34 43 43 73 73 105 105 137 137  P-391
2 7 4 15 5 21 8 34 10 43 16 73 24 105 30 137  P-392
1  7 2  15 3 21 5 34 7 43 11 73 16 105 21 137  P-80/84/801
1  7 1  15 1 21 2 34 3 43 5 73 7 105 9 137  P-802/842
1 3 1 8 1 11 1 18 1 23 2 38 2 55 3 71  P-462/464

Seconds per Inch of Cylinder Plunger Travel
Cyl Capacity
5 t 10 t 15 t 25 t 30 t 50 t 75 t 100 t  Pump Type
Power
 Source
No Load Load No Load Load No Load Load No Load Load No Load Load No Load Load No Load Load No Load Load
Electric

(speed based on 60 Hz)		 .30 3.0 .67 6.7 .94 9.4 1.5 15.5 1.9 19.5 3.3 33.2 4.8 47.7 6.2 61.9  0.5 hp Economy
.09 1.0 .19 2.2 .27 3.1 .44 5.1 .56 6.4 .94 10.9 1.4 15.6 1.8 20.3  ZU4-series
.40 3.0 .90 6.7 1.3 9.4 2.1 15.5 2.6 19.5 4.4 33.2 6.4 47.7 8.3 61.9  0.5 hp Submerged 61.9
.25 1.4 .56 3.2 .79 4.5 1.3 7.4 1.6 9.3 2.8 15.8 4.0 22.7 5.2 29.5  20-Series
.09 1.0 .21 2.2 .29 3.1 .48 5.2 .61 6.5 1.0 11.1 1.5 15.9 1.9 20.6  3-Series Hushh
.09 .50 .21 1.1 .29 1.6 .48 2.6 .61 3.2 1.0 5.5 1.5 8.0 1.9 10.3  5-Series Hushh
.06 .13 .13 .29 .19 .41 .30 .67 .38 .84 .65 1.4 .94 2.1 1.2 2.7  8000-Series
Air

(speed based on 100 psi air pressure)		 1.0 5.9 2.2 13.4 3.1 18.8 >5.2 30.9 6.5 39.0 11.0 66.3 15.9 95.5 20.6 123.9  Turbo II Pump
1.2 7.4 2.7 16.8 3.8 23.6 6.2 38.6 7.8 48.7 13.3 82.9 19.1 119.3 24.8 154.7  PA-133
.09 6.6 .21 14.9 .29 20.9 .48 34.3 .60 43.3 1.0 73.7 1.5 106.0 1.9 137.5  10-Series
.07 2.0 .16 4.5 .22 6.3 .36 10.3 .46 13.0 .80 22.1 1.1 31.8 1.5 41.3  Modular Air
Gasoline .30 1.5 .67 3.4 .94 4.7 1.5 7.7 1.9 9.7 3.3 16.6 4.8 23.9 6.2 30.9  Atlas Pump 2.5 hp
.12 1.1 .28 2.4 .39 3.4 .64 5.6 .81 7.1 1.4 12.1 2.0 17.3 2.6 22.5  Atlas Pump 5.0 hp
.12 .59 .28 1.3 .39 1.9 .64 3.1 .81 3.9 1.4 6.6 2.0 9.5 2.6 12.4  Atlas Pump 5.5 hp
.06 .30 .13 .67 .19 .94 .31 1.5 .39 1.9 .66 3.3 .95 4.7 1.2 6.2  Atlas Pump 13 hp

No Load indicates the plunger speed as the plunger extends toward the load (1st stage).
Load indicates the plunger speed as the load is lifted at a system pressure of 10,000 psi (2nd stage).		   Formula V = A ÷ Q

V (sec/in) = A (in2) ÷ Q (in3/min)
V = Cylinder plunger speed in seconds per inch
A = Cylinder effective area in square inches
Q = Pump oil flow in cubic inches

Example

At what speed (V) will the RC-308 (30 ton) cylinder move when powered by a 20-Series electric driven pump?

20-Series pump:
Oil flow Q, (no load) is 240 in3/min

RC-308 cylinder:
Effective area A is 6.50 in2

V = 6.50 in2 ÷ 240 in3/min x 60 = 1.60 sec/in


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