Hydraulic Filtration Machine | Hydraulic Oil Filter | Hidroman
Hydraulic Filtration Machine | Hydraulic Oil Filter | Hidroman
Hydraulic Filtration Machine
Mobile Hydraulic Oil Filtration and Flushing Machine
Hidroman hydraulic filtration machines are designed for professional hydraulic oil cleaning, offline filtration and hydraulic system flushing applications. Developed for industrial maintenance, hydraulic service workshops, OEM machinery manufacturers and mobile service teams, these filtration units help control fluid contamination and protect sensitive hydraulic components.
Clean hydraulic oil is essential for the reliable operation of pumps, valves, motors, cylinders and other hydraulic components. Even particles that cannot be seen with the naked eye can contribute to component wear, malfunction and unplanned downtime.
The Seide RK91 Mobile Hydraulic Filtration and Flushing Machine provides a practical solution for removing particulate contamination from hydraulic and lubrication fluids.
Seide RK91 Mobile Hydraulic Filtration Machine
The RK91 is a compact and mobile hydraulic oil filtration unit designed for easy filling, cleaning, flushing and transfer of hydraulic fluids.
Its ergonomic design allows the machine to be transported easily between different machines and service locations. The filtration unit can be used as an offline filtration system or connected directly to a hydraulic circuit for fluid cleaning and flushing applications.
Key Features
- Mobile hydraulic oil filtration and flushing system
- Compact and ergonomic design
- Multi-stage filtration
- Standard 60 µm, 25 µm and 10 µm filtration stages
- Optional 5 µm final filtration
- Available with 1, 2 or 3 filter stages
- Optional electronic particle counter
- Particle contamination monitoring according to ISO/NAS classifications
- Minimes connections for direct measurement
- Easy filter element replacement
- Integrated suction and return hoses
- Suitable for hydraulic oil and lubrication systems
- Designed for industrial maintenance and hydraulic service applications
Multi-Stage Hydraulic Oil Filtration
The RK91 can be configured with different filtration stages according to the required cleanliness level.
3-Stage Filtration
60 µm → 25 µm → 10 µm
The three-stage configuration provides progressive removal of particulate contamination and is suitable for general hydraulic oil cleaning and flushing applications.
2-Stage Filtration
25 µm → 10 µm
A compact configuration for applications where coarse pre-filtration is not required.
1-Stage Filtration
10 µm
A simple solution for applications requiring a single filtration stage.
Optional 5 µm Filtration
A 5 µm filter element can be selected when finer filtration is required.
The appropriate filtration level should always be determined according to the hydraulic system, fluid condition, component manufacturer's requirements and required cleanliness class.
Why Is Hydraulic Oil Filtration Important?
Hydraulic systems operate with components manufactured to very tight tolerances. Contamination in hydraulic fluid can accelerate wear and negatively affect pumps, proportional valves, servo valves, motors and other precision components.
Regular hydraulic oil filtration can help:
- Reduce particulate contamination
- Protect hydraulic components
- Improve fluid cleanliness
- Reduce wear caused by contamination
- Support preventive maintenance programs
- Extend hydraulic oil service life when the fluid remains chemically suitable
- Reduce unnecessary oil replacement
- Minimise the risk of contamination-related downtime
Hydraulic oil should not be considered clean simply because it looks clean. Many harmful particles are too small to be seen by the human eye. For this reason, particle counting and laboratory oil analysis provide a more reliable assessment of hydraulic fluid cleanliness.
Hydraulic Oil Filtration vs. Oil Replacement
Replacing hydraulic oil is not always the most appropriate solution when the primary problem is particulate contamination.
A professional hydraulic oil filtration machine allows contaminated fluid to be circulated through filtration elements and returned to the system or reservoir.
This approach can be particularly useful for:
- Preventive hydraulic maintenance
- Hydraulic service workshops
- Manufacturing plants
- Mobile maintenance teams
- Hydraulic power units
- Industrial machinery
- Construction equipment
- Injection moulding machines
- Press systems
- Mining equipment
- Wind turbine hydraulic systems
- OEM hydraulic machinery
However, filtration does not correct every type of fluid degradation. If hydraulic oil has suffered oxidation, chemical degradation, incorrect viscosity, severe water contamination or other fluid-quality problems, oil analysis should be performed before deciding on a filtration or oil replacement strategy.
Hydraulic System Flushing
The RK91 can also be used for hydraulic flushing applications.
Flushing is particularly important during:
- New hydraulic system commissioning
- Hydraulic component replacement
- Hose replacement
- Pipework installation
- Hydraulic system repair
- Major maintenance
- Reservoir cleaning
- Contamination removal
During flushing, the objective is to remove manufacturing debris, installation contamination and particulate matter before the hydraulic system is placed into service.
The required flushing procedure and target cleanliness level should be determined according to the hydraulic circuit design and the cleanliness requirements of the installed components.
Particle Contamination Monitoring
For applications where hydraulic cleanliness must be measured rather than visually assessed, the RK91 can be equipped with an electronic particle counter.
The particle monitoring system can count particles within defined size ranges and provide information that can be correlated with recognised hydraulic cleanliness classifications.
Measurements can be evaluated according to standards such as:
- ISO 4406
- NAS 1638
- SAE cleanliness classifications
This makes particle monitoring particularly useful for preventive maintenance and commissioning applications.
Why Particle Counting Matters
Visual inspection alone cannot determine whether hydraulic oil has reached the required cleanliness level.
Particle counting provides measurable data that can be used to compare the condition of hydraulic fluid before and after filtration.
For critical hydraulic systems, an oil cleanliness measurement can therefore provide a much more meaningful indication of filtration performance than simply looking at the colour or appearance of the oil.
Hydraulic Filtration and ISO 4406 Cleanliness
ISO 4406 is widely used to classify the level of solid particle contamination in hydraulic fluids.
A cleanliness code such as:
ISO 4406: 18/16/13
represents the number of particles present within specified particle-size ranges.
The required cleanliness class depends on the hydraulic components installed in the system.
For example, servo and proportional hydraulic systems generally require cleaner fluid than conventional hydraulic systems because of their tighter internal clearances and greater sensitivity to contamination.
The correct target cleanliness level should therefore be determined according to the component manufacturer's recommendations and the application.
Hydraulic Filtration for Preventive Maintenance
A mobile filtration unit can become an important part of a hydraulic preventive maintenance program.
Instead of waiting for contamination-related failures, maintenance teams can periodically monitor hydraulic fluid cleanliness and perform filtration when required.
A typical preventive maintenance process can include:
- Checking the hydraulic oil condition.
- Taking an oil sample when required.
- Measuring particle contamination.
- Comparing the result with the required cleanliness class.
- Selecting the appropriate filtration configuration.
- Circulating the hydraulic oil through the filtration unit.
- Rechecking the fluid cleanliness.
- Recording the results for maintenance documentation.
This approach helps maintenance teams make decisions based on measurable fluid-condition data.
Compact and Ergonomic Design
The RK91 was designed for professional service applications where mobility and ease of operation are important.
Its compact construction allows the unit to be transported between machines and service areas. The integrated hose arrangement and practical frame design help simplify connection, operation and storage.
The machine has an approximate weight of 120 kg, while the standard configuration includes suction and return hoses for connection to the hydraulic system or reservoir.
Technical Specifications
|
Specification |
RK91 |
|
Application |
Hydraulic oil filtration and flushing |
|
Filtration stages |
1, 2 or 3 stages |
|
Standard filter stages |
60 µm / 25 µm / 10 µm |
|
Optional final filtration |
5 µm |
|
Particle monitoring |
Optional electronic particle counter |
|
Connection |
Minimes connection available |
|
Suction hose |
DN32, 2 m |
|
Return hose |
DN32, 2 m |
|
Electrical supply |
1 × 230 V / 50 Hz |
|
Protection class |
IP54 |
|
Motor |
Air-cooled electric motor |
|
Cable length |
4 m |
|
Machine weight |
Approx. 120 kg |
Technical specifications may vary depending on the selected configuration and application requirements.
Filter Element Replacement
Regular filter element inspection and replacement are essential for maintaining filtration performance.
The service interval depends on:
- Hydraulic oil contamination level
- Oil viscosity
- Filtration frequency
- System cleanliness
- Filter element capacity
- Operating conditions
A heavily contaminated hydraulic system may require more frequent filter element replacement during the initial cleaning process.
After the hydraulic oil reaches the required cleanliness level, filter replacement intervals can be established according to operating conditions and maintenance data.
Applications
Hidroman hydraulic filtration machines are suitable for a wide range of industrial and mobile applications.
Industrial Hydraulic Systems
Suitable for hydraulic power units, presses, manufacturing machinery and industrial hydraulic circuits.
Hydraulic Service Workshops
The mobile design makes the RK91 practical for hydraulic repair and maintenance workshops.
Mobile Hydraulic Maintenance
The compact construction allows maintenance teams to transport the filtration unit between machines and service locations.
OEM Machinery
Hydraulic machinery manufacturers can use filtration and flushing equipment during system commissioning and final assembly.
Construction and Mining Equipment
The unit can be used for hydraulic oil cleaning and preventive maintenance on heavy-duty mobile equipment.
Wind Power Applications
Hydraulic systems used in wind turbines and related equipment can benefit from contamination monitoring and controlled filtration procedures.
Hydraulic Filtration Machine Manufacturer
Hidroman provides hydraulic engineering solutions for industrial and mobile applications, including hydraulic filtration machines, hydraulic power units, hydraulic cylinders, hydraulic hose equipment, test systems and hydraulic service equipment.
Our engineering approach focuses on practical solutions for hydraulic system reliability, contamination control and preventive maintenance.
For applications requiring a specific cleanliness level, filtration capacity or custom configuration, the appropriate filtration solution can be selected according to the hydraulic system and operating conditions.
Frequently Asked Questions
What is a hydraulic filtration machine?
A hydraulic filtration machine is a mobile or stationary unit used to remove particulate contamination from hydraulic oil. The contaminated fluid is circulated through one or more filter elements and returned to the hydraulic reservoir or system.
What is the difference between hydraulic filtration and flushing?
Filtration primarily focuses on removing contamination from hydraulic fluid, while flushing is a cleaning procedure used to remove contaminants from hydraulic circuits, pipes, hoses and components during commissioning or maintenance.
Can the RK91 filter hydraulic oil to 5 microns?
Yes. The standard filtration configuration includes 60 µm, 25 µm and 10 µm stages. A 5 µm filter element is available as an optional final filtration stage.
Can hydraulic oil cleanliness be checked visually?
No. Visual inspection cannot reliably determine the particle contamination level of hydraulic oil. Particle counting and oil analysis should be used when a defined cleanliness class is required.
What hydraulic oil cleanliness standard should be used?
The required cleanliness level depends on the hydraulic components and application. ISO 4406 is commonly used to classify hydraulic fluid particle contamination, while NAS 1638 may also be used in relevant applications.
How often should hydraulic oil be filtered?
There is no universal filtration interval. The frequency should be determined based on oil analysis, particle contamination measurements, operating conditions and the hydraulic equipment manufacturer's recommendations.
Does hydraulic filtration remove water from hydraulic oil?
Standard particulate filtration is primarily designed to remove solid contamination. Water contamination requires an appropriate water-removal or dehydration solution depending on the type and concentration of water in the fluid.
Can the RK91 be used for hydraulic system flushing?
Yes. The RK91 is designed for both hydraulic oil filtration and flushing applications. The appropriate flushing procedure and target cleanliness level should be determined according to the hydraulic circuit and component requirements.
Request a Hydraulic Filtration Solution
Are you looking for a hydraulic oil filtration machine, mobile filtration unit or hydraulic flushing machine for your industrial equipment?
Contact Hidroman to discuss your application, required filtration level, hydraulic oil volume and cleanliness target.
Our engineering team can help you select the appropriate filtration configuration for your hydraulic system.
Hidroman – Hydraulic Filtration and Hydraulic Engineering Solutions
Hydraulic Pickling and Flushing
Hydraulic Pipe Pickling and Flushing Process
Pickling and flushing are important cleaning processes used in hydraulic piping systems before commissioning. Pickling removes manufacturing and installation contaminants such as burrs, welding residues, rust and other deposits from the internal surfaces of pipes.
Flushing is the process of circulating hydraulic oil through the piping system to remove remaining particulate contamination. To effectively remove particles from a closed hydraulic circuit, the flushing oil must generate sufficient wall shear and turbulent flow inside the pipes.
A properly designed hydraulic flushing process helps achieve the required fluid cleanliness level before sensitive hydraulic components are placed into operation.
Pickling
The hydraulic pipe pickling process consists of three main stages:
- Acid cleaning – performed using Picklane T60.
- Neutralisation – performed using Passive T70.
- Hydraulic oil film formation – hydraulic oil is circulated through the system to create a protective oil film on the internal pipe surfaces.
After the acid cleaning and neutralisation stages have been completed, hydraulic oil is circulated through the system to form an oil film on the internal pipe surfaces. The system can then proceed to the flushing stage.
Equipment Used for Pickling
The main equipment required for the pickling process includes:
- 3 PVC tanks for acid, water and neutralisation fluids
- Acid pump
- Heating unit
- pH indicator
The equipment configuration may be selected according to the size, length and requirements of the hydraulic piping system.
Hydraulic Flushing
Hydraulic flushing is a cleaning process performed after hydraulic pipe manufacturing and installation have been completed.
The objective is to remove particulate contamination from the internal surfaces of pipes by generating a controlled turbulent oil flow through the hydraulic circuit.
The required flow rate and pressure are calculated according to the pipe diameter and total line length. Loops are created where required to achieve the appropriate flushing flow without creating excessive pressure drop.
The flushing process is then started after the circuit has been properly configured.
Online Particle Measurement
Online measurements can be obtained through Minimes test points installed on the hydraulic line.
The oil cleanliness level is monitored during the flushing process. Once the required cleanliness level has been achieved, the flushing oil is removed from the system using nitrogen gas and the system is prepared for delivery.
This measurement-based approach allows flushing results to be evaluated according to recognised hydraulic fluid cleanliness classifications rather than relying only on visual inspection.
Hydraulic Flushing Equipment
The main equipment used for hydraulic flushing includes:
- Hydraulic flushing unit
- Filter elements: 3, 6, 10 and 20 µm
- Hydraulic manifolds
- Hydraulic hoses for flushing loops
- Online particle counter
The duration of the flushing process depends primarily on the total pipe length and the amount of particulate contamination present in the system.
Flushing Time and System Configuration
Selecting a flushing unit with the appropriate capacity is essential for controlling the flushing time.
Correct loop configuration and dividing long pipelines into suitable sections can significantly improve the effectiveness of the flushing process.
If the flushing unit capacity is insufficient or the hydraulic circuit is not configured correctly, the flushing process may become unnecessarily long and may fail to achieve the required cleanliness level.
Determining Hydraulic Flushing Flow Rates
One of the most important factors in hydraulic flushing is achieving turbulent oil flow.
For turbulent flow, the Reynolds number must generally be above 2,320. As the flushing flow rate increases, the required flushing time generally decreases.
Because hydraulic systems often contain large-diameter pipes, the flow rate must be selected according to practical pump capacity and system requirements.
Although a Reynolds number of 2,320 is generally considered sufficient for the transition to turbulent flow, a Reynolds number of approximately 5,000 is commonly used for flushing calculations to provide a practical balance between turbulent flow and achievable pump capacity.
Hydraulic Flushing Flow Rate Formula
The flow rate can be calculated using:
Q = Re × v × d × 0.0000471
Where:
- Q = Flow rate (L/min)
- Re = Reynolds number
- v = Oil viscosity (mm²/s)
- d = Internal pipe diameter (mm)
The required flushing flow rate should be determined according to the largest pressure and return lines in the hydraulic system.
Hydraulic Flushing Flow Rate Calculation Example
As an example, assume:
- Pressure line: 2" (48.3 × 5 mm)
- Return line: 2" (60.3 × 2.77 mm)
- Oil temperature: 60°C (140°F)
- Oil viscosity: 22 mm²/s
- Reynolds number: 5,000
Pressure Line
The internal diameter of the pressure line is 38.3 mm.
Therefore:
Q = 5000 × 22 × 38.3 × 0.0000471
Q = 198 L/min
A flow rate of 198 L/min or higher is sufficient for the flushing process for this example.
Return Line
The internal diameter of the return line is 54.76 mm.
Therefore:
Q = 5000 × 22 × 54.76 × 0.0000471
Q = 283 L/min
Since both the pressure and return lines are cleaned during the flushing operation, the minimum required flow rate for this example is considered to be 283 L/min.
This represents the minimum calculated flow rate. A higher flow rate can reduce the flushing time. However, the total amount of contamination in the hydraulic system remains one of the main factors determining the actual flushing duration.
Second-Stage Hydraulic Flushing
After the initial cleaning of the system with the flushing unit, the main hydraulic reservoir is filled with hydraulic oil.
All hydraulic pumps are started and oil is circulated through the system from the main reservoir at a lower operating pressure.
All hydraulic blocks and piping are connected. Hydraulic cylinders and hydraulic motors are not connected during this stage.
All valves are energised, and the system return line is connected to the main return filters and subsequently to the main reservoir.
Once the required cleanliness level has been achieved, the temporary flushing circuits are removed and the hydraulic system is returned to its normal operating configuration.
Particular care must be taken during disassembly and reassembly to prevent the introduction of new contamination into the system.
Seide RK91 Mobile Filtration and Flushing Machine
The Seide RK91 mobile filtration and flushing machine can be used for hydraulic oil filtration, system flushing and contamination control applications.
Replacement Filter Elements
|
Housing Code |
Filter Element Code |
Filtration Rating |
|
HDM112-05 |
SDM5060-05 |
5 µm |
|
HDM112-10 |
SDM5060-10 |
10 µm |
|
HDM112-25 |
SDM5060-25 |
25 µm |
|
HDM112-60 |
SDM5060-60 |
60 µm |
Technical Specifications
|
Specification |
Value |
|
Pump flow rate |
80 L/min |
|
Motor power |
1.1 kW / 1450 rpm |
|
Number of filters |
3 |
|
Filter capacity |
900 L/min × 3 |
|
Dirt-holding capacity |
180 g × 3 |
|
Weight |
65 kg |
|
Machine voltage |
380–400 V |
|
SDM5060-05 |
5 µm replacement filter element |
|
SDM5060-10 |
10 µm replacement filter element |
|
SDM5060-25 |
25 µm replacement filter element |
|
SDM5060-60 |
60 µm replacement filter element |
|
SDM5060-05S |
5 µm replacement filter element with water separation |
|
SDM5060-10S |
10 µm replacement filter element with water separation |
|
SDM5060-25S |
25 µm replacement filter element with water separation |
|
SDM5060-60S |
60 µm replacement filter element with water separation |
The above technical specifications and replacement filter references are based on the supplied technical document.
Hydraulic Flushing Flow Rate Calculation According to Pipe Diameter
Flow Rate Calculation Formula
The Reynolds number can be calculated using:
Re = (21220 × Q) / (v × d)
Where:
- Q = Flow rate (L/min)
- Re = Reynolds number
- v = Oil viscosity (mm²/s)
- d = Internal pipe diameter (mm)
The required flushing flow rate should be determined according to the largest pipe diameter in the system.
Example Calculation – 2-Inch Pipe
Assume the largest line is:
2" (60.3 × 2.77 mm)
Internal diameter:
54.76 mm
Assume:
- Reynolds number: 4,000
- Oil temperature: 60°C (140°F)
- Oil viscosity: 22 mm²/s
Therefore:
Re = (21220 × Q) / (v × d)
4000 = (21220 × Q) / (22 × 54.76)
4000 = (21220 × Q) / 1204.72
1204.72 × 4000 = 21220 × Q
Q = 1204.72 × 4000 / 21220
Q = 227 L/min
The calculated flow rate is sufficient for the flushing process in this example.
This represents the minimum calculated flow rate. Increasing the flow rate can reduce the flushing time; however, the actual contamination level of the hydraulic system remains a major factor affecting total flushing duration.
Reynolds Number and Hydraulic Flushing Pump Flow Rate
The following tables provide reference flow rates for achieving laminar and turbulent flow conditions at different pipe diameters and oil viscosities.
Oil Viscosity: 68 cSt / Oil Temperature: 55°C
|
Pipe Size |
DN |
Outside Diameter (mm) |
Inside Diameter (mm) |
Laminar Flow – Re 2300 (L/min) |
Turbulent Flow – Re 4000 (L/min) |
|
1/8" |
DN 6 |
10.29 |
6.84 |
25.95 |
45.13 |
|
1/4" |
DN 8 |
13.72 |
9.25 |
35.09 |
61.03 |
|
3/8" |
DN 10 |
17.15 |
12.53 |
47.53 |
82.65 |
|
1/2" |
DN 15 |
21.34 |
15.80 |
59.95 |
104.25 |
|
3/4" |
DN 20 |
26.67 |
20.93 |
79.40 |
138.09 |
|
1" |
DN 25 |
33.40 |
26.64 |
101.08 |
175.79 |
|
1-1/4" |
DN 32 |
42.16 |
35.05 |
132.96 |
231.23 |
|
1-1/2" |
DN 40 |
48.26 |
40.89 |
155.14 |
269.80 |
|
2" |
DN 50 |
60.33 |
52.51 |
199.19 |
346.41 |
|
2-1/2" |
DN 65 |
73.02 |
62.71 |
237.89 |
413.72 |
|
3" |
DN 80 |
88.90 |
77.93 |
295.63 |
514.13 |
|
3-1/2" |
DN 90 |
101.60 |
90.12 |
341.88 |
594.57 |
|
4" |
DN 100 |
114.30 |
102.26 |
387.93 |
674.67 |
|
4-1/2" |
DN 115 |
127.00 |
114.45 |
434.18 |
755.10 |
|
5" |
DN 125 |
141.30 |
128.19 |
486.32 |
845.77 |
|
6" |
DN 150 |
168.27 |
154.05 |
584.39 |
1,016.33 |
|
8" |
DN 200 |
219.08 |
202.72 |
769.04 |
1,337.47 |
|
10" |
DN 250 |
273.05 |
254.51 |
965.50 |
1,679.13 |
|
12" |
DN 300 |
323.85 |
304.80 |
1,156.29 |
2,010.93 |
|
14" |
DN 350 |
355.60 |
336.55 |
1,276.73 |
2,220.41 |
|
16" |
DN 400 |
406.40 |
387.35 |
1,469.45 |
2,555.56 |
|
18" |
DN 450 |
457.20 |
438.15 |
1,662.16 |
2,890.72 |
|
20" |
DN 500 |
508.00 |
488.95 |
1,854.88 |
3,225.87 |
|
24" |
DN 600 |
609.60 |
590.55 |
2,240.31 |
3,896.18 |
|
28" |
DN 700 |
711.20 |
692.15 |
2,625.73 |
4,566.49 |
|
30" |
DN 750 |
762.00 |
742.95 |
2,818.45 |
4,901.65 |
|
32" |
DN 800 |
812.80 |
793.75 |
3,011.16 |
5,236.80 |
|
36" |
DN 900 |
914.40 |
895.35 |
3,396.59 |
5,907.12 |
Pipe wall thickness: SCH 40 / STD.
Oil Viscosity: 46 cSt / Oil Temperature: 55°C
|
Pipe Size |
DN |
Outside Diameter (mm) |
Inside Diameter (mm) |
Laminar Flow – Re 2300 (L/min) |
Turbulent Flow – Re 4000 (L/min) |
|
1/8" |
DN 6 |
10.29 |
6.84 |
18.53 |
32.23 |
|
1/4" |
DN 8 |
13.72 |
9.25 |
25.06 |
43.59 |
|
3/8" |
DN 10 |
17.15 |
12.53 |
33.95 |
59.04 |
|
1/2" |
DN 15 |
21.34 |
15.80 |
42.82 |
74.47 |
|
3/4" |
DN 20 |
26.67 |
20.93 |
56.71 |
98.63 |
|
1" |
DN 25 |
33.40 |
26.64 |
72.20 |
125.56 |
|
1-1/4" |
DN 32 |
42.16 |
35.05 |
94.97 |
165.16 |
|
1-1/2" |
DN 40 |
48.26 |
40.89 |
110.81 |
192.71 |
|
2" |
DN 50 |
60.33 |
52.51 |
142.28 |
247.44 |
|
2-1/2" |
DN 65 |
73.02 |
62.71 |
169.92 |
295.51 |
|
3" |
DN 80 |
88.90 |
77.93 |
211.16 |
367.24 |
|
3-1/2" |
DN 90 |
101.60 |
90.12 |
244.20 |
424.69 |
|
4" |
DN 100 |
114.30 |
102.26 |
277.09 |
481.90 |
|
4-1/2" |
DN 115 |
127.00 |
114.45 |
310.13 |
539.36 |
|
5" |
DN 125 |
141.30 |
128.19 |
347.37 |
604.12 |
|
6" |
DN 150 |
168.27 |
154.05 |
417.42 |
725.95 |
|
8" |
DN 200 |
219.08 |
202.72 |
549.32 |
955.33 |
|
10" |
DN 250 |
273.05 |
254.51 |
689.64 |
1,199.38 |
|
12" |
DN 300 |
323.85 |
304.80 |
825.92 |
1,436.38 |
|
14" |
DN 350 |
355.60 |
336.55 |
911.95 |
1,586.00 |
|
16" |
DN 400 |
406.40 |
387.35 |
1,049.61 |
1,825.40 |
|
18" |
DN 450 |
457.20 |
438.15 |
1,187.26 |
2,064.80 |
|
20" |
DN 500 |
508.00 |
488.95 |
1,324.91 |
2,304.19 |
|
24" |
DN 600 |
609.60 |
590.55 |
1,600.22 |
2,782.99 |
|
28" |
DN 700 |
711.20 |
692.15 |
1,875.52 |
3,261.78 |
|
30" |
DN 750 |
762.00 |
742.95 |
2,013.18 |
3,501.18 |
|
32" |
DN 800 |
812.80 |
793.75 |
2,150.83 |
3,740.57 |
|
36" |
DN 900 |
914.40 |
895.35 |
2,426.14 |
4,219.37 |
Pipe wall thickness: SCH 40 / STD.
Oil Viscosity: 32 cSt / Oil Temperature: 55°C
|
Pipe Size |
DN |
Outside Diameter (mm) |
Inside Diameter (mm) |
Laminar Flow – Re 2300 (L/min) |
Turbulent Flow – Re 4000 (L/min) |
|
1/8" |
DN 6 |
10.29 |
6.84 |
13.34 |
23.19 |
|
1/4" |
DN 8 |
13.72 |
9.25 |
18.05 |
31.39 |
|
3/8" |
DN 10 |
17.15 |
12.53 |
24.44 |
42.51 |
|
1/2" |
DN 15 |
21.34 |
15.80 |
30.83 |
53.62 |
|
3/4" |
DN 20 |
26.67 |
20.93 |
40.83 |
71.02 |
|
1" |
DN 25 |
33.40 |
26.64 |
51.98 |
90.40 |
|
1-1/4" |
DN 32 |
42.16 |
35.05 |
68.38 |
118.92 |
|
1-1/2" |
DN 40 |
48.26 |
40.89 |
79.78 |
138.75 |
|
2" |
DN 50 |
60.33 |
52.51 |
102.44 |
178.15 |
|
2-1/2" |
DN 65 |
73.02 |
62.71 |
122.34 |
212.77 |
|
3" |
DN 80 |
88.90 |
77.93 |
152.04 |
264.41 |
|
3-1/2" |
DN 90 |
101.60 |
90.12 |
175.82 |
305.78 |
|
4" |
DN 100 |
114.30 |
102.26 |
199.51 |
346.97 |
|
4-1/2" |
DN 115 |
127.00 |
114.45 |
223.29 |
388.34 |
|
5" |
DN 125 |
141.30 |
128.19 |
250.11 |
434.97 |
|
6" |
DN 150 |
168.27 |
154.05 |
300.54 |
522.68 |
|
8" |
DN 200 |
219.08 |
202.72 |
395.51 |
687.84 |
|
10" |
DN 250 |
273.05 |
254.51 |
496.54 |
863.55 |
|
12" |
DN 300 |
323.85 |
304.80 |
594.66 |
1,034.19 |
|
14" |
DN 350 |
355.60 |
336.55 |
656.61 |
1,141.92 |
|
16" |
DN 400 |
406.40 |
387.35 |
755.72 |
1,314.29 |
|
18" |
DN 450 |
457.20 |
438.15 |
854.83 |
1,486.65 |
|
20" |
DN 500 |
508.00 |
488.95 |
953.94 |
1,659.02 |
|
24" |
DN 600 |
609.60 |
590.55 |
1,152.16 |
2,003.75 |
|
28" |
DN 700 |
711.20 |
692.15 |
1,350.38 |
2,348.48 |
|
30" |
DN 750 |
762.00 |
742.95 |
1,449.49 |
2,520.85 |
|
32" |
DN 800 |
812.80 |
793.75 |
1,548.60 |
2,693.21 |
|
36" |
DN 900 |
914.40 |
895.35 |
1,746.82 |
3,037.95 |
Pipe wall thickness: SCH 40 / STD.
ISO 4406 Hydraulic Oil Cleanliness Classification
ISO 4406 is used to classify the level of particulate contamination in hydraulic fluids.
The ISO 4406 cleanliness code is based on the number of particles within defined particle-size ranges.
The table below shows the ISO 4406 codes according to the number of particles per 100 ml of fluid.
|
ISO 4406 Code |
Particle Count – Lower Limit |
Particle Count – Upper Limit |
|
0 |
0 |
1 |
|
1 |
1 |
2 |
|
2 |
2 |
4 |
|
3 |
4 |
8 |
|
4 |
8 |
16 |
|
5 |
16 |
32 |
|
6 |
32 |
64 |
|
7 |
64 |
130 |
|
8 |
130 |
250 |
|
9 |
250 |
500 |
|
10 |
500 |
1,000 |
|
11 |
1,000 |
2,000 |
|
12 |
2,000 |
4,000 |
|
13 |
4,000 |
8,000 |
|
14 |
8,000 |
16,000 |
|
15 |
16,000 |
32,000 |
|
16 |
32,000 |
64,000 |
|
17 |
64,000 |
130,000 |
|
18 |
130,000 |
250,000 |
|
19 |
250,000 |
500,000 |
|
20 |
500,000 |
1,000,000 |
|
21 |
1,000,000 |
2,000,000 |
|
22 |
2,000,000 |
4,000,000 |
|
23 |
4,000,000 |
8,000,000 |
|
24 |
8,000,000 |
16,000,000 |
|
25 |
16,000,000 |
32,000,000 |
|
26 |
32,000,000 |
64,000,000 |
|
27 |
64,000,000 |
130,000,000 |
|
28 |
130,000,000 |
250,000,000 |
|
29 |
250,000,000 |
∞ |
How to Read an ISO 4406 Code
For example:
ISO 4406: 15/13/11
In the ISO 4406 classification:
- The first code represents particles ≥4 µm.
- The second code represents particles ≥6 µm.
- The third code represents particles ≥14 µm.
Therefore, ISO 4406: 15/13/11 provides a three-number representation of the particulate contamination level in the hydraulic fluid.
NAS 1638 Hydraulic Fluid Cleanliness Classification
NAS 1638 classifies hydraulic fluid contamination according to particle-size ranges.
The relevant particle-size ranges are:
- 5–15 µm
- 15–25 µm
- 25–50 µm
- 50–100 µm
100 µm
The particle count within each range is evaluated separately. The highest corresponding class determines the overall NAS 1638 contamination class.
|
NAS 1638 Class |
5–15 µm |
15–25 µm |
25–50 µm |
50–100 µm |
>100 µm |
|
0 |
125 |
22 |
4 |
1 |
0 |
|
0 |
250 |
44 |
8 |
2 |
0 |
|
1 |
500 |
89 |
16 |
3 |
1 |
|
2 |
1,000 |
178 |
32 |
6 |
1 |
|
3 |
2,000 |
356 |
63 |
11 |
2 |
|
4 |
4,000 |
712 |
126 |
22 |
4 |
|
5 |
8,000 |
1,425 |
253 |
45 |
8 |
|
6 |
16,000 |
2,850 |
506 |
90 |
16 |
|
7 |
32,000 |
5,700 |
1,012 |
190 |
32 |
|
8 |
64,000 |
11,400 |
2,025 |
360 |
64 |
|
9 |
128,000 |
22,800 |
4,050 |
720 |
128 |
|
10 |
256,000 |
45,600 |
8,100 |
1,440 |
256 |
|
11 |
512,000 |
91,200 |
16,200 |
2,880 |
512 |
|
12 |
1,024,000 |
182,400 |
32,400 |
5,760 |
1,024 |
For example:
NAS 1638 Class: 6
The NAS 1638 classification is determined by separately counting particles within each specified particle-size range and identifying the corresponding contamination class. The highest resulting class determines the overall NAS 1638 cleanliness classification.
Hydraulic Filtration Machine Replacement Filter Elements
The following replacement filter elements are specified for the filtration machine:
|
Filter Element Code |
Filtration Rating |
|
S5.1280.115-05 |
5 µm |
|
S5.1280.110-10 |
10 µm |
|
S5.1280.125-25 |
25 µm |
|
S5.1280.160-60 |
60 µm |
These filter element codes are based on the supplied technical documentation.
Hydraulic Flushing and Filtration Engineering
Effective hydraulic flushing is not simply a matter of circulating oil through a filter. The pipe diameter, oil viscosity, flow rate, Reynolds number, circuit configuration, contamination level and filtration capacity must all be considered when designing a flushing process.
For this reason, the correct flushing unit and flow rate should be selected according to the hydraulic system's actual requirements.
Hidroman provides hydraulic filtration and flushing solutions for industrial hydraulic systems, hydraulic power units, hydraulic piping installations and hydraulic maintenance applications.
For a flushing application, the required equipment and process parameters can be determined according to:
- Pipe diameter
- Pipe length
- Hydraulic oil viscosity
- Required cleanliness level
- Hydraulic circuit configuration
- Required flushing flow rate
- System contamination level
- Required ISO 4406 or NAS 1638 cleanliness class
- Hydraulic component sensitivity