Hydraulic Power Packs

When using hydraulic power packs, humid air is sucked in by pressure compensation with the environment, which condenses when the temperature falls below the dew point. The use in high humidity and temperature fluctuations promotes condensation damage. Rapid aging of the hydraulic oil, degradation of additives and promotion of corrosion are only some of the possible damages.

To prevent the formation of foam caused by condensation, the use of an aeration dryer is an effective measure. This dries the incoming air and thus achieves a strong reduction of the water content and the dew point. While a well designed ventilation dryer protects the hydraulic unit very efficiently, the handling is simple. The colour change of the silica gel from orange to green indicates the condition of the adsorber. GIEBEL FilTec has developed different series for the protection on hydraulic power packs.

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Presentation

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FORMATION OF WATER IN THE HYDRAULIC TANK

Hydraulic WITHOUT Adsorber

-> Use of a ventilation filter without desiccant
Ambient air enriched with moisture
Hydraulic oil is removed from the tank
Oil level drops
Pressure equalization by incoming air

-> Inflowing air humidity according to ambient air!
Hydraulic oil is pumped back into the tank.
Oil level is rising
Pressure compensation through outflowing humid air.
Cooling of the ambient air below dew point
-> Emergence condensation in the interior
-> Drops form and water flows into the hydraulic oil

FUNCTIONAL HYDRAULIC POWER PACK - HUMIDITY AND DEW POINT

Transmission of forces, torque and energy by hydraulic pressure fluids!! -> Pressure equalization with ambient air

Air intake from the environment

Passive air exchange
due to temperature fluctuations

Active air exchange
by oil extraction and -supply
Absolute Humidity
Content of water vapor
Relative Humidity
Percentage to maximum humidity

Example
Temperature = 20°C
Air humidity = 80% rF

-> Water 13.8g/m³
-> Dew point 16,4°C

-> Permissible temperature range = 3,6°C

DAMAGE CAUSED BY WATER

„80% of particles and water are the cause of malfunctions and damage in hydraulic systems, gearboxes and rolling bearings“

Consequences:

Hydrolyse – Rapid aging and degradation of additives
Promotion of corrosion
Worse lubrication

AVOIDANCE OF WATER IN THE HYDRAULIC TANK

Hydraulic WITH Adsorber

-> Use of an adsorber with desiccant
Ambient air enriched with moisture
Hydraulic oil is removed from the tank
Oil level drops
Pressure equalization by incoming air
Moisture is separated

-> Incoming humid ca. 10% rH!
Hydraulic oil is pumped back into the tank
Oil level is rising
Pressure equalization by outgoing dry air
Cooling of the ambient air below dew point
-> No condensation inside
-> No drops of water
-> No water in the hydraulic oil

Adsorber lowers the air humidity to below 2%RH
and the dew point to below -40°C
Humidity after Adsorber
average 10% rH
Content of water: 1,7 g/m³
Dew point: -12,5°C

EXAMPLES OF USE

Lift Bridge
hydraulic tank: 5000l
Oil: synthetic esters

Task: Lifting the bridge
Operation approx. 10x per day,
filling of cylinders

-> Application Adsorber VV 5XL-RV
Hydropower Plant
hydraulic tank: 1000l
Oil: synthetic esters

Task: Turbine lubrication
Operation: Continuous operation,
circulating oil lubrication

-> Application Adsorber VV 5M-RV
Paper Machine
hydraulic tank: 800l
Oil: Mineral oil HLP46

Task: Central lubrication system
Operation: Continuous operation,
circulating oil lubrication

-> Application Adsorber VV 5M-R
Lock
hydraulic tank: 600l
Oil: Mineral oil HLP46

Task: Moving the gates
Operation: approx. 20-40x per day,
filling of cylinders

-> Application Adsorber VV 3L-DV

Test Stand
hydraulic tank: 150l
Oil: Mineral oil HLP46

Task: Lubrication of test gearboxes Automotive
Operation: continuous operation,
protection against oil mist

-> Application Adsorber VG 3L-D
Straddle Carrier
hydraulic tank: 55l
Oil: Mineral oil HLP46

Task: brake cooling and steering
Operation: Shift operation,
outdoor use, pendulum movement

-> Application Adsorber VV 2L-DV
Tunnel Boring Machine
hydraulic tank: 400l
Oil: Mineral oil HLP46

Task: Feed drill head
Operation: during use
continuous, low pendulum

-> Application Adsorber MA 3M-DV
Training Plant
hydraulic tank: 10l
Oil: Mineral oil HLP46

Task: Training / Presentation
Operation: rarely, during
training

-> Application Adsorber VV 2L-DV

Cruise Ship
hydraulic tank: 60l
Oil: biodegradable oil

Task: Lowering the lifeboats
Operation: "never" - only
during tests and possibly in
an emergency

-> Application Adsorber VV 1L-DV
Injection Moulding Machine
hydraulic tank: 6000l
Oil: Mineral oil HLP46

Task: Closing the casting tools
Operation: Continuous
operation, cycle approx. 100
sec.

-> Verwendung
Application Adsorber VV 5XL-R
Excavator
Hydraulic tank: 200l
Oil: biodegradable oil

Task: earthmoving machine,
cylinder strokes
Operation: continuous use,
outdoor use, harsh conditions

-> Application Adsorber MA 3M-R
with valve adapter 0.5bar
Storage tank Hydraulic oil
tank capacity: 10.000l
Oil: Mineral oil HLP46

Task:
Storage and
cleaning of the oil
Operation: 24/7
Protection against humidity
by temperature fluctuation
and sun

-> Application Adsorber VV-RV with
venting system

References

SELECTION OF A STANDARD ADSORBER

Adsorber VV-D

Usage
Drying Incoming Air

Materials
Polycarbonate, polyamide,
FKM Silica gel Orange

Substance
Hydraulic oil, Gear oil,
Biological oil, Vegetable oil,
Transformer oil, Insulating oil,
AdBlue (urea), Diesel fuel,
Isocyanates, Polyols, Anhydrite

Valves
No

Rechargeable
No

Usage according ATEX 2014
No

Offhore suitable
Yes

Adsorber VV-DV

Usage
Drying Incoming Air

Materials
Polycarbonate, polyamide,
FKM Silica gel Orange

Substance
Hydraulic oil, Gear oil,
Biological oil, Vegetable oil,
Transformer oil, Insulating oil,
AdBlue (urea), Diesel fuel,
Isocyanates, Polyols, Anhydrite

Valves
Yes

Rechargeable
No

Usage according ATEX 2014
No

Offhore suitable
Yes

Adsorber VV-R

Usage
Drying Incoming Air

Materials
Polycarbonate, polyamide,
FKM Silica gel Orange

Substance
Hydraulic oil, Gear oil,
Biological oil, Vegetable oil,
Transformer oil, Insulating oil,
AdBlue (urea), Diesel fuel,
Isocyanates, Polyols, Anhydrite

Valves
No

Rechargeable
Yes

Usage according ATEX 2014
No

Offhore suitable
No

Adsorber VV-RV

Usage
Drying Incoming Air

Materials
Polycarbonate, polyamide,
FKM Silica gel Orange

Substance
Hydraulic oil, Gear oil,
Biological oil, Vegetable oil,
Transformer oil, Insulating oil,
AdBlue (urea), Diesel fuel,
Isocyanates, Polyols, Anhydrite

Valves
Yes

Rechargeable
Yes

Usage according ATEX 2014
No

Offhore suitable
No

SELECTION OF A SPECIAL ADSORBER

Adsorber MA-RV

Usage
Drying Incoming Air

Materials
Aluminium, FKM
Silica gel Orange

Substance
Like Adsorber VV
and additionally …
flammable liquids
(fuels, solvents, etc.)

Valves
Yes

Rechargeable
Yes

Usage according ATEX 2014
Yes

Offhore suitable
No

Adsorber MA-RV

Usage
Drying Incoming Air

Materials
Aluminium, EPDM
Silicagel Orange

Substance
Skydrol, HyJet IV/V,
Brake fluids

Valves
Yes

Rechargeable
No

Usage according ATEX 2014
Yes

Offhore suitable
Yes

Adsorber ME-RV

Usage
Drying Incoming Air

Materials
Stainless steel A4, FKM
Silica gel orange

Substance
Wie Adsorber VV & MA
and additionally …
flammable liquids
(fuels, solvents, etc.)

Valves
Yes

Rechargeable
Yes

Usage according ATEX 2014
Yes

Offhore suitable
Yes

SELECTION OF AN OIL MIST SEPARATOR

Adsorber VG-D

Usage
Separation of Pollutants

Materials
Polycarbonate, polyamide, FKM
Activated carbon

Substance
Hydraulic oil, Gear oil,
Biological oil, Vegetable oil,
Transformer oil, Insulating oil,
AdBlue (urea), Diesel fuel,
Isocyanates, Polyols, Anhydrite

Valves
No

Wiederbefüllbar
No

Usage according ATEX 2014
No

Offhore suitable
Yes

Adsorber VG-R

Usage
Separation of Pollutants

Materials
Polycarbonate, polyamide, FKM
Activated carbon

Substance
Hydraulic oil, Gear oil,
Biological oil, Vegetable oil,
Transformer oil, Insulating oil,
AdBlue (urea), Diesel fuel,
Isocyanates, Polyols, Anhydrite

Valves
No

Wiederbefüllbar
Yes

Usage according ATEX 2014
No

Offhore suitable
No

SELECTION OF SUITABLE ACCESSORIES

Flange Adapter according to DIN 24557 Bolt circle 73 mm, including flat view and screws	Filling Adapter according to DIN 24557 With stainless steel strainer and filling opening, incl. Screw plug	Suction lance according to DIN 24557 Bolt circle 73 mm, for sucking in and returning the oil

Protection adapter Incl. Low pressure gauge and protection valves, over / under pressure from 0.18 bar	Wall mount For easy installation in tight spaces on a wall	Oil seperator For separating escaping oil mist and for cooling the air

Mounting adapter Displacement of an adsorber to avoid obstacles	Valve adpater Adsorber application on hydraulic tanks	Protection hood for the protection of adsorbers in harsh environments

DETERMINATION OF SIZE


Adsorber	VV-D	VV-DV	VV-R	VV-RV	MA-RV		ME-RV	VG-D	VG-R
Usage	Drying Supply air							separation of pollutants
Material	Polycarbonate, Polyamide, FKM Silica gel Orange				Aluminium, FKM Silica gel Orange	Aluminium, EPDM Silica gel Orange	Stainless steel A4, FKM Silica gel Orange	Polycarbonate, Polyamide, FKM activated carbon
Valves	No	Yes	No	Yes	Yes	Yes	Yes	No	No
Refillable	No	No	Yes	Yes	Yes	Yes	Yes	No	Yes
Usage according to ATEX 2014	No	No	No	No	Yes	Yes	Yes	No	No
Use Indoor / below deck	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Use outdoor / on land	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Use on deck / offshore	Yes	Yes	No	No	No	No	Yes	Yes	No
Tank-/Shuttle volume	VV-D	VV-DV	VV-R	VV-RV	MA-RV		ME-RV	VG-D	VG-R
0 - 50 ltr. up to 10 l/min - max. 30 l/min	VV-D 1L	VV-DV 1L	VV-R 1L	VV-RV 1L				VG-D 1L	VG-R 1L
50 - 100 ltr. up to 20 l/min - max. 100 l/min	VV-D 2L	VV-DV 2L	VV-R 2L	VV-RV 2L	MA-RV 2L	MA-RV 2L	ME-RV 2L	VG-D 2L	VG-R 2L
100 - 400 ltr. up to 40 l/min - max. 260 l/min	VV-D 3M	VV-DV 3M	VV-R 3M	VV-RV 3M	MA-RV 3M	MA-RV 3M	ME-RV 3M	VG-D 3L	VG-R 3L
400 - 800 ltr. up to 80 l/min - max. 490 l/min	VV-D 3L	VV-DV 3L	VV-R 3L	VV-RV 3L	MA-RV 3L	MA-RV 3L	ME-RV 3L	VG-D 5L	VG-R 5L
800 - 1800 ltr. up to 110 l/min - max. 610 l/min	VV-D 5M	VV-DV 5M	VV-R 5M	VV-RV 5M	MA-RV 5M	MA-RV 5M	ME-RV 5M	VG-D 5XL	VG-R 5XL
1800 - 3600 ltr. bis 160 l/min - max. 930 l/min	VV-D 5L	VV-DV 5L	VV-R 5L	VV-RV 5L	MA-RV 5L	MA-RV 5L	ME-RV 5L
3600 - 5400 ltr. up to 210 l/min - max. 1250 l/min	VV-D 5XL	VV-DV 5XL	VV-R 5XL	VV-RV 5XL	MA-RV 5XL	MA-RV 5XL	ME-RV 5XL