DISCALDIRT deaerator-dirt separator

Transcription

1 DISLDIR deaerator-dirt separator 6 series REDIED ISO 900 M 6 ISO 900 No / G replaces dp 0/0 G unction Deaerators-dirt separators are used to continuously eliminate the air and dirt contained in the hydraulic circuits of heating and cooling systems. he air discharge capacity of these devices is very high. hey are capable of automatically removing all the air present in the system down to micro-bubble level. t the same time they separate dirt and impurities contained in the water within the circuit and collect them in the lower part of the valve body, from which they may be expelled. he circulation of fully deaerated water enables the equipment to operate under optimum conditions, free from any noise, corrosion, localised overheating or mechanical damage. langed and weld-end deaerators-dirt separators are supplied complete with hot pre-formed shell insulation to ensure perfect thermal insulation when used in both hot and chilled water systems. Patented. Reference documentation: - ech. broch DISL deaerator series - ech. broch. 07 DIRL dirt separator 6 series Gamma prodotti 6 series DISLDIR deaerator-dirt separator with olive connections size DN 0 (Ø ) 6 series DISLDIR deaerator-dirt separator size DN 0 (/ ), DN ( ), DN ( / ) 6 series DISLDIRMG deaerator-dirt separator with magnet size DN 0 (/ ), DN ( ), DN ( / ) 6 series DISLDIR deaerator-dirt separator with flanged connections and pre-formed insulation size DN 0DN 0 6 series DISLDIR deaerator-dirt separator with weld ends and pre-formed insulation size DN 0DN 0 6 series DISLDIR deaerator-dirt separator with flanged connections and floor supports size DN DN 00 echnical specifications series 6 threaded 6 flanged and weld ends Materials ody: brass EN 6 W67N epoxy resin coated steel Dirt separation chamber: brass EN 6 W67N - utomatic air vent body: brass EN 6 W67N brass EN 6 W67N Internal element: P66G0 stainless steel loat: PP PP loat guide and stem: brass EN 6 W6N brass EN 6 W6N loat lever and spring: stainless steel EN 070- (ISI 0) stainless steel EN 070- (ISI 0) Hydraulic seals: EPDM EPDM Drain cock: brass EN 6 W67N - Drain valve: - brass EN 6 W67N Performance Medium: water, glycol solutions water, non-hazardous glycol solutions excluded from the guidelines of directive 67/8/E Max. percentage of glycol: 0% 0% Max. working pressure: 0 bar 0 bar Working temperature range: Particle separation rating: up to µm up to µm Ring system magnetic induction: (6 series) x 0, - onnections Main: with compression ends for Ø mm copper pipe; DN 0DN 0, PN 6 /,, / (ISO 8-) DN DN 00, PN 0 to be coupled with EN 09- counterflanges DN 0DN 0 weld ends Probe holder: DN DN 00, inlet/outlet / Drain: hose connection DN 0DN 0, DN DN 00,

2 Dimensions D D E G 8 D ode Size D E (kg) 600 DN 0 Ø 7 8,0 E D E G ode Size D E (kg) 600 DN 0 / 0 8, DN 0 8, DN / 0 8,9 E echnical specifications of insulation Inner part Material: closed cell expanded PE-X hickness: DN 0DN 00; 60 mm DN DN 0; 0 mm Density: - inner part: 0 kg/m - outer part: 80 kg/m hermal conductivity (ISO 8): - at 0 : 0,08 W/(m K) - at 0 : 0,0 W/(m K) oefficient of resistance to water vapour (DIN 6): >.00 Working temperature range: 000 Reaction to fire (DIN 0): class echnical specification of insulation for threaded model (code 600, 6006 and 6007) Material: closed cell expanded PE-X hickness: 0 mm Density: inner part: 0 kg/m ; outer part: 80 kg/m hermal conductivity (ISO 8): - a 0 : 0,08 W/(m K) - a 0 : 0,0 W/(m K) oefficient of resistance to water vapour (DIN 6): >.00 Working temperature range: 00 Reaction to fire (DIN 0): class External cover Material: embossed unfinished aluminium hickness: 0,7 mm Reaction to fire (DIN 0): class D E ode Size D E (kg) 60 DN 0 / 0 8 6,9 606 DN 0 8 6,9 607 DN / 0 8 6,9 ode DN DN DN DN DN 6 6. DN 0 6 Size DN 0 Volume (l),6 (kg) D E G DN 6,8 DN 80 8,6 DN 00 9,6 ode 6 DN DN DN DN DN DN 7 D E 00 G DN 0 DN (kg) 00 0

3 Operating principle he deaerator-dirt separator uses the combined action of several physical principles. he active part consists of an assembly of concentric metal mesh surfaces. hese elements create the whirling movement required to facilitate the release of micro-bubbles and their adhesion to these surfaces. he bubbles, fusing with each other, increase in volume until the hydrostatic thrust is such as to overcome the adhesion force to the structure. hey rise towards the top of the unit from which they are released through a float-operated automatic air release valve. he impurities in the water, colliding with the metal surfaces of the internal element, are separated out and fall to the bottom of the valve body. 6 onstruction details he particular construction of the DISLDIR allows it to be maintained and cleaned without removing the device from the system. Note the following: he moving parts that control the air venting are accessed simply by removing the upper cover (). he deaerator-dirt separator automatic air vent, located at the top of the device, is equipped with a long chamber for float movement (). his feature prevents any impurities in the water from reaching the seal seat. Simply unscrew the top part of the casing () to clean the entire air venting system. langed and weld-end deaerators-dirt separetors are equipped with a cock () that has the dual function of releasing large quantities of air when the system is being filled and of removing the impurities that float on top of the water. When checking the internal element of threaded deaerators-dirt separators, simply unscrew the large dirt collection chamber () to which the internal element is fixed, so that it can be removed for cleaning. hreaded versions of DISLDIR have a collection chamber equipped with a shut-off cock and hose attachment with plug (6), while flanged and weld-end versions have a ball shut-off valve (7). his means impurities can even be expelled while the system is in operation. 6 Separation of ferrous impurities his series of deaerator-dirt separators, fitted with a magnet, offer greater efficiency in the separation and collection of ferrous impurities. he impurities are trapped inside the dirt separator body by the strong magnetic field created by the magnets inserted in the special outer ring. he outer ring can also be removed from the body to allow their decantation and subsequent expulsion while the system is still running. Since the magnetic ring is positioned outside the dirt separator body, the hydraulic characteristics of the device are not altered. Insulation langed and weld-end DISLDIR devices are supplied complete with hot pre-formed shell insulation. his system ensures not only perfect thermal insulation, but also the tightness required to prevent atmospheric water vapour from entering the unit. or this reason, this type of insulation may also be used in cooling water circuits as it prevents condensation from forming on the surface of the valve body. 7 7

4 Hydraulic characteristics he maximum recommended speed of the medium to the device connections is, m/s. he following table shows the maximum flow rates in order to meet this requirement. DN connections l/min m /h 0 Ø - /,7,6,8, / 7,8,7 0, 8,7 6 8,6, 80 6,, ,8,89 980,0 8,8 0 6,6 86,,0 6, ,0,0 00 6,0,0 DN onnections Kv (m /h) 0 Ø -/ 6, hreaded version 8, / 8,8 0 7,0 6 0, , ,0 langed version 0,0 0 70,0 900,0 0, ,0 he process of air formation he amount of air which can remain dissolved in a water solution is a function of pressure and temperature. his relationship is governed by Henry s Law and the graph below allows the physical phenomenon of the air content release of the fluid to be quantified. s an example, at a constant absolute pressure of bar, if the water is heated from 0 to 80, the amount of air released by the solution is equal to 8 l per m of water. ccording to this law it can be seen that the amount of air released increases with temperature rise and pressure reduction. he air comes in the form of micro-bubbles of diameters in the order of tenths of a millimetre. In heating and cooling systems there are specific points where this process of formation of micro-bubbles takes place continuously: in the boiler and in any device which operates under conditions of cavitation. Max amount in litres of dissolved air per m of water (l/m ) Graph: Solubility of air in water bsolute pressure bar bar bar bar bar 6 bar 7 bar 8 bar Water temperature 80 oiler micro-bubbles Micro-bubbles are formed continuously on the surface separating the water from the combustion chamber due to the fluid temperature. his air, carried by the water, collects in the critical points of the circuit from where it must be removed. Some of this air is reabsorbed in the presence of colder surfaces. avitation and micro-bubbles Micro-bubbles develop where the fluid velocity is very high with the corresponding reduction in pressure. hese points are typically the pump impeller and the regulating valve seating. hese air and vapour micro-bubbles, the formation of which is enhanced in the case of non de-aerated water, may s u b s e q u e n t l y implode due to the cavitation phenomenon. Pressure Seat-obturator distance Pressure luid vapour pressure Implosions avitation micro-bubbles Velocity Velocity

5 Separation efficiency he capacity for separating the impurities in the medium circulating in the closed circuits of the systems basically depends on three parameters: ) It increases as the size and mass of the particle increase. he larger and heavier particles drop before the lighter ones. ) It increases as the speed decreases. If the speed decreases, there is a calm zone inside the dirt separator and the particles separate more easily. ) It increases as the number of recirculations increases. he medium in the circuit, flowing through the dirt separator a number of times during operation, is subjected to a progressive action of separation, until the impurities are completely removed. he aleffi DISLDIR deareator-dirt separator, thanks to the special design of its internal element, is able to completely separate the impurities in the circuit down to a minimum particle size of μm. he graph alongside, summarising the tests carried out in a specialised laboratory (NO - Science and Industry), illustrates how it is able to quickly separate nearly all the impurities. fter only 0 recirculations, approximately one day of operation, up to 00% is effectively removed from the circuit for particles of diameter greater than 00 μm and on average up to 80% taking account of the smallest particles. he continual passing of the medium during normal operation of the system gradually leads to complete dirt removal. Reduced head losses normal Y strainer performs its function via a metal mesh selected for the size of the largest particle. he medium therefore has a consequent initial loss of head that increases as the degree of clogging increases. Whereas, the dirt separator carries out its action by the particles striking the internal element and subsequently dropping into the collection chamber. he consequent head losses are greatly reduced and are not affected by the amount of impurities collected. he graph alongside shows a comparison of the differences in head loss between the two types of device. Particle separation rating - Deaerator-dirt separator efficiency Efficiency (%) Separated quantity. 00% Initial quantity ( ) Δp (mm w.g.) Particle dimensions (μm) omparison of head losses: deaerator-dirt separator - Y-SRINERS Y-strainer curve / - Kv= Efficiency 0 passages (0, m/s) 0 DISLDIR curve / - Kv=6, ests in a specialized laboratory NO - Science and Industry (NL) WORKING ZONE DIRL Efficiency 0 passages ( m/s) 00 Δp (kpa) RRIDGE ILERS SPEIL SRINERS Y-SRINERS ,,,8,6,, 0,9 0,8 0,7 0,6 0, 0, 0, 0, 0, 0,8 0,6 0, 0, 0, 0, 0, G (l/h) 000 Installation DISLDIR devices may be used in both heating and cooling circuits, to guarantee progressive elimination of impurities and air which form continuously. hey should preferably be installed after the boiler, on the pump suction side, as this is where most of the micro-bubbles form. DISLDIR deaerators-dirt separators must be installed in a vertical position. It is recommended that the air vent cap is replaced with a aleffi 60 series hygroscopic safety cap if the device is installed in a location that cannot be inspected. HILLER

6 pplication diagram P Shut-off valve Pump P Pressure switch Sensor pocket all valve UOLOW ontrol pocket Safety valve LLSOP low meter Gas filter ackflow preventer emperature gauge Differential by-pass valve emperature probe Safety thermostat Gas regulator Y-strainer utomatic filling unit low switch Zone valve Regulator Expansion vessel -way valve uel shut-off valve nti-vibration joint SPEIIION SUMMRY DISLDIR 6 series Deaerator-dirt separator. Size DN 0 (from DN 0 to DN ); onnections / (from / to / ) (ISO 8-). rass dirt separation chamber and body. rass automatic air vent body. P66G0 internal element. PP float. rass float guide and stem. Stainless steel float lever and spring. EPDM hydraulic seals. rass drain cock. Medium water and non-dangerous glycol solutions excluded from the guidelines of E directive 67/8; maximum percentage of glycol 0%. Maximum working pressure 0 bar. Working temperature range 00. Particle separation rating down to µm. Drain: with hose connection. DISLDIRMG 6 series Deaerator-dirt separator whit magnet. Size DN 0 (from DN 0 to DN ); connections /" (from / to / ) (ISO 8-). rass dirt separation chamber and body. rass automatic air vent body. P66G0 internal element. PP float. rass float guide and stem. Stainless steel float lever and spring. EPDM hydraulic seals. rass drain cock. Medium water, non-hazardous glycol solutions; maximum percentage of glycol 0%. Maximum working pressure 0 bar. Working temperature range 00. Particle separation rating down to µm. Ring system magnetic induction x 0,. Drain: with hose connection. P - INERNIONL PPLIION PENDING. DISLDIR 6 series Deaerator-dirt separator. langed connections DN 0 (from DN 0 to DN 0) PN 6, DN (from DN to DN 00) PN 0, to be coupled with counterflanges EN 09-. Weld end connections DN 0 (from DN 0 to DN 0). Drain valve. Epoxy resin coated steel body. rass automatic air vent body. Stainless steel internal element. PP float. rass float guide and stem. Stainless steel float lever and spring. EPDM hydraulic seals. rass drain valve. Medium: water and non-dangerous glycol solutions excluded from the guidelines of E directive 67/8; maximum percentage of glycol 0%. Maximum working pressure 0 bar. Working temperature range 00. Particle separation rating down to µm. losed cell expanded PE-X shell insulation and embossed unfinished aluminium external cover for flanged and weld end models DN 0 (from DN 0 to DN 0). Working temperature range 000. We reserve the right to change our products and their relevant technical data, contained in this publication, at any time and without prior notice. aleffi S.p.. S.R. 9 n. 800 ontaneto d gogna (NO) Italy el ax info@caleffi.com opyright 0 aleffi