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Distributor Zone / FAQ / Screw Compressors / FAQ Screw Compressors

FAQ Screw Compressors



What is the availability (lead time)?

Its depending on your customer center, some customer centers has chosen to have the most frequent compressors in stock some not. We recommend to keep a few compressors in your own stock for quick delivery to customer site.

How big difference in running cost is it between a belt driven screw compressor and a direct driven?

There is a difference in running cost between the 2 technologies. The belt driven unit is less expensive investment but consumes in average 3% extra energy. Also a little bit more time has to be put to maintenance, by adjusting for example the belt. The most suitable technology depends on the customer needs.  

Does the screw compressors with integrated dryer require separate voltage supply?

Depending on the models. For the active range from 30 to 110 kW the transformer can be ordered as an option => when this option is fitted, there is no need for a separate power supply. On future ranges it will most likely be an std option.

I just bought a direct driven screw compressor with integrated energy recovery, how do I decide what flow I should have over the energy recovery water circuit?

Its depending on the site conditions, and what temperature the customer wishes to have. Below you see a chart that you can use as a reference, the chart below is for a 30 kW and 37 kW  compressor. This data can be found on the MBP > Marketing > Range > Oil injected screws > your model. 
 

Softened water for 30 kW 
T. inlet
T. outlet
Flow
(l/min)

DP Bar
0
60,0
7,2
0,005
5
58,0
8,0
0,006
10
56,0
9,4
0,007
15
54,0
11,0
0,010
20
52,0
13,5
0,015
25
50,0
17,4
0,025
30
46,5
26,0
0,055
35
44,0
48,0
0,170
40
45,0
90,0
0,566
 
Softened water 37 kW
T. inlet
T. outlet
Flow l/min)
DP Bar
0
59,0
9,0
0,007
5
57,5
10,0
0,009
10
55,0
12,0
0,012
15
53,0
14,0
0,017
20
50,0
17,7
0,026
25
47,0
24,0
0,045
30
44,0
39,0
0,117
35
41,0
87,0
0,540

What certifications do you deliver with the compressor from production site?

The included documentation at delivery is the local certificates: Europe for example the CE documentation, for North America the UL/cUL, ASME. If you are missing your certificate at delivery you can download it on the MBP > Aftermarket > Service Connect. Then write the serial number of the unit in the open field and press search.

What is normally the pay back for an inverter compressor?

The normal pay back is between 1-2 years during normal conditions and 4000 running’s hours per year. Not seldom we see pay backs within a year.

Operating principle of an inverter compressor?

It has almost the same components as a conventional compressor but there is, of course, a few main differences. A frequency driven compressor has an integrated inverter and often a more advanced control system. The inverter adjusts the motor speed to the actual air demand. This is controlled by a sensor that measures the system pressure this is signaled to the controller of the compressor. The controller registers the pressure and sends a signal to the inverter which regulates how much air the compressor needs to produce in order to keep the set pressure.

Why is an inverter compressor saving energy?

Because an inverter/frequency driven compressor is not producing more air than needed. A conventional compressor works within a pressure band. When reaching the higher pressure the machine goes into unload mode (the motor is running but no air is produced). When reaching the lower pressure value the compressor starts to build up pressure again until it reaches its unload pressure again. An inverter/frequency driven compressor has less unload time and works towards a set pressure value, this makes the inverter compressors in general 30% more energy efficient than a conventional load/unload compressor.

Why is an internal water separator drain necessary?

First, an internal Water Separator Drain ( inside of the compressor ) is NOT necessary.
But it can have some benefits in two cases:
  1. Screw without an integrated dryer: Using a water separator drain, we remove some water from the compressed air, before its delivered to the final area of use with less water content.
  2. Screw with an integrated dryer: Using it before the dryer, some of the water gets removed before the dryer, this gives the opportunity to choose a smaller sized air dryer. 

Is there any recommendations regarding ventilation of compressor room?

All compressor rooms require ventilation. Minimum room ventilation can be calculated form the formula:
Qv = 1.06 N / T for Pack unit
Qv = (1.06 N + 1.3) / T for Full-Feature unit
Qv = required cooling air flow (m³/s)
N = shaft input of compressor (kW)
T = temperature increase in compressor room. (usually 7 °C)
If the compressor is conducted, the required ventilation is the same as the fan capacity of the compressor. This is mentioned in the instruction manual.



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