Aquamicron® Filter Elements - Hydac

Aquamicron ®Filter ElementsE 7.201.5/11.04

1. DESCRIPTIONThe presence of water inhydraulic media causes manyproblems, for example, thesaturation of very fine filters orjamming of valves, and theseproblems are often wronglyattributed to excessive levels ofsolid particle contamination.In addition to this the build-up ofrust and the reduction inlubrication on bearings and slidescan lead to considerableimpairment in the functioning of asystem. In other words, water isa serious "contaminant" of ahydraulic medium.Since methods usually employedup to now to extract water have,on the whole, proved to beuneconomical compared to thepurchase price of a system,HYDAC Aquamicron ® technologyoffers an economically sound, yeteffective, method of separatingwater from hydraulic media.Aquamicron® filter elements arespecially designed to separatewater from mineral oils, HFD-Roils and biodegradable oils.They are only available in thedimensions of the HYDAC HCreturn line filter elements fromsize 330 upwards. This meansthat they can be installed in allHYDAC filter housings from size330/331 upwards, which are fittedwith return line filter elements.The increasing pressure loss in afilter element which is beingsaturated with water indicates,by means of standard cloggingindicators, that it is time to changethe element. When Aquamicron ®technology is employed, solidparticle contaminants are alsoseparated from the hydraulicmedium as a side-effect.This means that the Aquamicron ®element doubles as a safety filter.The "filtration rating" is40 µm absolute (β 40≥100 to∆p = 3 bar). In order to guaranteegreatest efficiency it isrecommended that they areinstalled off-line.Note:The Aquamicron ® elements aredisposable items.1.1. PRINCIPLES OF AQUAMICRON ® TECHNOLOGYThe separation of water from hydraulic fluids with the aid of the superabsorber embedded in the filter material is based on a physical-chemicalreaction. The super absorber reacts with the water present in the mediumand expands to form a gel, from which the water present in the medium canno longer be extracted even by increasing the pressure.The Aquamicron ® technology is capable of absorbing circulating water, be itemulsified or free. These filter elements cannot remove dissolved water fromthe system, i.e. water below the saturation level of the hydraulic medium.The following principles apply to Aquamicron ® technology:High water content ⇒ High absorption rateLow water content ⇒ Low absorption rateUnsaturated filter element ⇒ High absorption rateSaturated filter element ⇒ Low absorption rateHydraulic Absorption rate filter area load Water retention capacity (l/min cm²) Residual water content Static pressure Absorption rate =Water retention capacity =Residual water contentPressure and flow-rate Absorption rate fluctuations present Water retention capacity Residual water contentDispersion/detergent Absorption rate additive present Water retention capacity =Residual water contentKey to symbols: increases decreases = constant2. GENERALMax. permissible operatingpressure25 barMax. permissible ∆pacross element10 barTemperature range0 °C to +100 °CCompatibility with hydraulicmediaMineral oils:test criteria to ISO 2943Lubricating oils:test criteria to ISO 2943Other media on requestCracking pressure of thebypass valve∆p o= 3 bar +10%Bypass valve curvesThe bypass valve curves applyto mineral oils with a density of0.86 kg/dm 3 . The differentialpressure of the valve changesproportionally to the density.∆p in barA: Sizes: 0500 R ...0850 R ...2600 R ...B: Sizes: 0330 R ...0660 R ...1300 R ...C: Sizes: 0950 R ...Q in l/min as a percentage of the sizeE 7.201.5/11.042

3. MODEL CODESize0330050006600850095013002600TypeR(also order example)Filtration rating in µm040 absoluteFilter materialAquamicron ®Supplementary details–V FPM (-Viton) seal0660 R 040 AM /-V4. ELEMENTSPECIFICATIONS4.1. FILTRATION AREASizecm²0330 27850500 42590660 61740850 79490950 86671300 121112600 247115. DETERMINATION OF THE WATER CONTENT G WPRESENT IN THE SYSTEMTwo methods can be employed to determine the water content G Wpresent inthe system:– the hydrogen gas method– the Karl Fischer method to DIN 51777The hydrogen gas method can be carried out using portable test equipment,e.g. the HYDAC Water Test Kit WTK; however, reading accuracy at watercontents below 500 ppm is limited.The Karl Fischer method, on the other hand, can only be conducted in thelaboratory. It is available from HYDAC Filtration Technology as a laboratoryservice.The water content G Wis usually given in ppm (parts per million) or in percent(100 ppm corresponds to 0.01 %).6. CALCULATION6.1. DETERMINATION OFTHE WATER RETENTION CAPACITY C W (cm³)q = Q (Recommendation: q max ≤ 0.04 l/min cm²)Aq = specific filtration area load of a filter element in l/min cm²Q = flow rate in l/minA = filtration area in cm² (point 4.1)Specific water retention capacityK W (10 -3 cm³ H 2O/cm²)Viscosity: 30 mm²/sDensity: 0.86 kg/dm³C WC WK WRecommended application rangeUneconomical application range= K W x A (cm³)= water retention capacity of a filter element in cm³= specific water retention capacity dependent on the specificfiltration area load q in (10 -3 cm³ H 2O/cm²)A = filtration area in cm² (see point 4.1.)q = specific filtration area load of a filter element in l/min cm²Specific filtrationarea loadq (l/min x cm²)E 7.201.5/11.043

6.2. AQUAMICRON ® ELEMENT SIZERECOMMENDATIONSSize Recommended Water retention Part no.flow rate capacity C W in cm³ atin l/min ∆p = 2.5 bar and an oilviscosity of 30 mm²/s0330 13 advised 260 315268100 maximum 1800500 19 advised 400 315355155 maximum 2800660 28 advised 570 315356255 maximum 4000850 35 advised 730 315357286 maximum 5200950 39 advised 800 315358314 maximum 5701300 54 advised 1120 315269437 maximum 7902600 109 advised 2230 316102870 maximum 15706.3. CALCULATION OF THE WATER QUANTITY m WTO BE ABSORBED BY THE FILTER ELEMENTm W = ∆G W x 10 -3 x V T (cm³)m W = water quantity to be absorbed bythe filter element in cm³∆G W = difference between the initial and requiredfinal water content in ppmPlease note:It is impossible to achieve a final watercontent below the saturation level ofthe hydraulic medium!V T = tank volume in litres x 10006.4. CALCULATION OF THE NUMBEROF ELEMENTS REQUIREDn = m WC Wn = number of filter elements requiredThe economical use of Aquamicron ®technology depends on the cost offilter elements compared to the cost ofbuying and disposing of the oil.m W = water quantity to be absorbed bythe filter element in cm 3 (see point 6.3.)C W = water-retention capacity of a filter elementin cm 3 (see point 6.1.)E 7.201.5/11.047. NOTEThe information in this brochure relates to theoperating conditions and applications described.For applications or operating conditions notdescribed, please contact the relevant technicaldepartment.Subject to technical modifications.E 7.201.5/11.04