Customers Benefit from Technical Progress

The new generation

The screw compressor unit Delta Screw Generation 5 is the synthesis of the successful characteristics developed in previous generations combined with new technical innovations that already meet the market requirements of the future.

Why Generation 5?

Aerzener Maschinenfabrik was the first compressor manufacturer to design a compact unit and has developed this machine type continuously ever since. Delta Screw Generation 5 is therefore the fifth generation of Aerzen compressor units and represents the successful combination of tradition and innovation.
The considerable experience in manufacturing oil-free compressors is the guarantor for high-quality and most reliable compressor units.
However compared to other blower models this new series offers 5 main advantages for the customers. 5 main advantages which led to the name “Generation 5”.

Energy efficiency and reduction of Life-Cycle-Costs

The Aerzen screw compressors distinguish themselves by two different rotor profiles, which is a criterion which is so far unique on the market for screw compressors.
For low-pressure applications up to 2 barg a specially designed 3 + 4-profile (VML-compressors), for higher pressures up to 3,5 barg a 4 + 6-profile (VM-compressors) is available.

Therefore, depending on the individual case of application and pressure range the energetically optimal compressor type is available. The energy efficiency increases furthermore by two different outlets per rotor profile, arranging depending on pressure and volume flow for an optimum of internal compression.
The different internal pressure ratios avoid possible overcompressions, the efficiency of the machines increases. So, e.g. in the low pressure range up to 2 bar an energetic advantage of more than 20% compared with other compressor models may result.
Furthermore the accessory components of the compressor units were revised technically. Due to innovations in the discharge pressure silencing, pressure losses have been reduced by up to 20%.

EN: Schalldruckpegel im Vergleich (700 mbar mit Schallhaube)

In addition as standard only motors of the energy efficient class EFF1 are used. From this result further saving potentials depending on size of up to 3 %.
As two thirds of the Life-Cycle-Costs of compressors are determined by the energy consumption, the investment costs, when deciding for an Aerzen compressor unit, already pay off after a short time. Maintenance costs with a share of approx. 20 % are another essential factor when considering Life-Cycle-Costs. Also in this case the new Delta Screw Generation 5 compressor units captivate because of technical innovations

Lower Sound Levels

Compared with the previous generation the sound levels of the new Delta Screw Generation 5 could be reduced by an average of about 6 dB(A), in some cases even more. Absorption material was not used intentionally further on (foodstuff-compatibility).

Due to these considerable sound reductions, expensive special measures (such as special acoustic hoods) are no longer required.

ATEX-certification

The translation of the European machine directive 94/9/EG for explosion-hazardous areas is becoming more and more important in all branches and ranges of application. The compressor units made by Aerzener are especially designed for the requirements in categories 2 and 3 for dust- as well as gas zones and certified accordingly.
In addition the new units Delta Screw Generation 5 distinguish themselves by a special solution for explosion protection in pneumatic conveying of bulk material. If combustible
bulk material is conveyed pneumatically, in the unit in case of certain dust-air concentrations
inflammable mixtures may develop. On the basis of the EU-directive 1999/92/EG (ATEX 137) therefore an additional protection e.g. by means of an external spark arrester in connection with compressors is to be provided. At this point starts the innovative solution of Aerzener Maschinenfabrik:
The newly designed discharge silencer of the Aerzen compressor units is free from absorption material, the sound is dampened only by means of air-redirections. In expensive and practical tests this silencer could now be certified in addition as spark arrester. External spark arresters are no longer necessary! Besides utmost safety, consequently costs are saved and pressure- and energy losses are reduced considerably.

Space saving design

The new compressor units Delta Screw Generation 5 distinguish themselves by their very compact construction. Additionally the installation option „Side-by-Side“ is available, i.e. the units can be installed directly one beside the other, without leading to disadvantages for services and maintenances. The reduction of space can therefore lead to savings with smaller machine rooms.

5 sizes in 2 nominal widths:
Low space requirement due to compact construction and installation option “Side-by-Side”.

Easy operation and maintenance

During development of the new units, special consideration was given to the ease of handling of the machines and reduction of the maintenance expenditure. Easy handling starts with easy installation:

The new design units can be easily transported at site, by means of a four wheel pallet truck and/or fork lift trucks. An integrated service package simplifies the commissioning as well as further service tasks.

The units are being operated from the front. All components requiring maintenance are easily accessible. One of the most important advantages is the new oil system.
The oil level can be viewed and checked from the outside of the unit while it is still in operation without any problems. Compressor shutdowns, process and production interruptions belong to the past.

The patented drive concept with belt drive also leads to a reduction of the maintenance expenditure and thus reduction of the Life-Cycle-Costs. Concerning the Aerzen concept the drive motor is installed on a hinged motor mounting plate and with its own weight always arranges for optimal belt tension.

Retensioning – even after a longer period of operation – is no longer necessary. In addition this new concept makes supplementary adjusting of the performance data possible (pressure/volume flow) by means of easy and favourable-priced changing of the pulleys.

Further advantages of the new series Delta Screw Generation 5:

No use of absorption material (foodstuff-compatibility!)
Mechanical fan
Class 0-certification (no oil required)
Approval acc. to PED-, ASME-, RTN-directive as well as China Licence

Scope of supply and performances:

Aerzen screw compressor stage with reinforced bearings of driving shaft (secondary rotor) suitable for belt drive, forced-feed oil lubrication incl. oil pump, oil filter, oil pressure regulating valve, turbo filter for oil chamber release
Base support with hinged motor mounting plate (three-phase current motor)
Intake filter (single-stage) and intake silencer integrated in base support
Belt drive with belt guard (optional)
Discharge silencer without absorption material
Safety relief valve (type-tested)
Non-return valve
Expansion joint for connection to the pressure pipe
Flex. machinery mountings with anchor bolts
Electronic control system AS 200 for protection of the machine with indication and monitoring for intake-, discharge- and oil pressure, discharge- and oil temperature, single fault indication and operating hour meter

Accessories: Options

Driving motor as three-phase current motor including assembly in Aerzen
Acoustic hood for the complete compressor unit for indoor- and outdoor installation
Start-up unloading valve for VML-compressors (self-medium controlled)
Constant-speed unloading device for VM-compressors including suction throttle, unloading valve and pressure switch PSLH (self-medium controlled)
Power cabinet for starting the machine ( e.g. direct starting, star-delta)
Frequency converter, designed as separate cabinet (installation and external wiring at site)
Overflow regulating valve (self-medium controlled) for keeping the discharge pressure constant, or vacuum, provided in unfixed condition for installation into the pipework at site
Separate aftercooler, provided in unfixed condition for installation into the pressure pipe at site, designed as air-/aircooler or air/watercooler. In case of risk of forming of condensate on request also with cyclone separator and automatic drain.

Modifications: Options

Nitrogen-design incl. suction silencer, starting strainer, expansion joint suction-sided, suction-pressure gauge
ATEX-design (EEx) of main- and auxiliary drives for various requirements (e.g. EEx e or EEx de)
Special instrumentation in coordination with customers’ specification
Deviating painting
ANSI-flanges for connection to suction- or discharge-sided pipe
Vacuum-design (also with pre-inlet) incl. suction silencer, expansion joint suction-sided, suction-pressure gauge, suction valve, vacuum filter as option
ATEX 100A-certification
ATEX-certification as spark arrester
Approval acc. to PED-, ASME-, RTN- directive as well as China Licence

Instrumentation and monitoring

Aerzen Universal control unit AS 200 including instrumentation in analogue technology with pressure transmitter for intake-, discharge- and oil pressure as well as resistance thermometer for discharge- and oil temperature. The indications are optionally available (multilingual) in the display, control options for various cases of operation, indication of service intervals, limit value detection as fault indication archive, Modbus interface (RS 485) for
data transmission (e.g. remote diagnosis, remote control – design not ex-proof).