heat exchangers - Boldrocchi

1 heat exchangersOn the 3rd of March 1909 LUIGI Boldrocchi establishedthe activity with the first orders for the supply of ten centrifugal 1911the Officine Termo Meccaniche Boldrocchi was setup in Milan with a manufacturing area of 3000 square 1914 the first plant for air pollution control was company offered a wide range of products including radialand axial fans, fire-tube boilers, coolers, dryers, ventilating andheat-exchange units and 1926, the licence for the manufacture of finned tubes wasacquired in the USA and the production of extended surfaceheat- exchangers was the twenties and thirties the company becomes a regularsupplier of the main Italian industrial groups, the Ministry ofDefence, naval yards and State first complete equipment to cool a power transformer wasdeveloped and supplied in the post-war period, the activity was carried on by GIULIANO Boldrocchi who progressively abandoned standard production to concentrate on tailor made equipment for specific industrial fieldssuch as: power generation, electromechanical industry and major 1970, a new factory was built and, with some later extensions, forms the present the early 80 s, supplies for the nuclear sector induced the company to introduce a Quality AssuranceSystem.

2 From then on, the product range has been enlarged, particularly for process air coolersand steam condensers. In the environmental field, two independent divisions have been established:Aeroto, part of the group since 1994 keeps the original name of the company Aeroto, active since1952 in industrial noise protection and gas turbine , a fusion of our traditional technology with the expertise of De Cardenas, purchased in 1997and active since 1926 in air pollution control and industrial has become a heavy-duty fan leader in the world making the most of its centenary expertisewith the ones of De Cardenas and MarelliIn 2006 a joint-venture manufacturing company has been set up in NOTESEng. Luigi Boldrocchi (1880-1949)Founder of the Boldrocchi CompanyTechincal drawing of OFAF cooler ROT G VI 800 kWOFAF cooler series ROT 48supplied in 19482In three separate workshops with a total meter manufacturing area, Boldrocchiemploys 300 staff, among which 100 shops are equipped with thermal, acousticand aeraulic test production is divided into four mainlines: heat exchange ( exchangers and coolers),fans, industrial noise protection and air pollutioncontrol.

3 Today production is featured by highlyspecialised technical contents, many decades of'on site' experiences, flexibility in design and inproduction together with high quality are tailor made to fulfil all Customers specific requests. Boldrocchi Quality system iscertified according to ISO 9001 since 1993 andaccording to ASME Code since wide range of materials are usually used: steel and copper alloys, aluminium, titanium and plasticmaterials; more than 200 welding procedures have been qualified. The products are subject tointermediate and final testing, witnessed by the SITUATIONAXIAL FANSV ariable pitch bladesHigh efficiencyUse of special materialsAEROTO DIVISIONGas turbine air intake Gas turbine exhaust systems with diverters,silencers and stacksAbsorption and resonance silencers Silencers for gas exhaust of internalcombustion enginesAcoustic enclosures complete with auxiliary plants ECOLOGIA DIVISIONF abric filters Electrostatic precipitatorsScrubbersMechanical collectorsGas coolers and conditioning towersHot gas ductsDust handlingBag filters and ESP revampingGas cleaning plants enhancementPlanned maintenance services SERVICE DIVISIONP roblem solving Field measurementsRebuilds and upgradesRevamping of existingComponent upgrade and overhaulCommissioning and erection supervisionPeriodic and preventive maintenancePOWER TRANSFORMER COOLERSOil to Air coolersOil to Water coolers single tubesOil to Water cooler double tubesLow noise fansAxial and radial pumpsMOTORS AND GENERATORS COOLERSAir-air coolers and air-water coolersExplosion proof and special equipmentComplete

4 Equipment with coolers,hoods, fans, filters and silencersHydrogen coolersOil bearings coolersHeavy duty axial fansEXCHANGERSAir coolers for refinery service and forother industrial purposeShell and tube heat exchangersSurface condenserGas heaters and coolersAir pre-heatersFinned tube coolers and FANSFor industrial applicationFlow rate : up to 600 m3/sPressure : up to 80 kPaShaft power : up to kWTemperature : up to 850 CTip speed : up to 300 m/sUse of special materialsGas tightness for special fluidsWear and corrosion design During 1931 Boldrocchi tested and manufactured the firstOFAF transformer oil cooler and since 1948 an engineeringdepartment has been exclusively devoted to large electricalmachines cooling:Static electrical machineLarge power transformersDistribution transformers ReactorsIndustrial and furnace transformersRotating electrical machineMotorsGeneratorsMore than seventy years of experience in this specific fieldallows Boldrocchi to offer each customer the best solutionsmatching all the requirements and to optimize reliability,performance and facilities are equipped to check the thermal efficiency ofthe coolers by using dielectric oil or water and air toguarantee a reliable know-how and the most used coolers prototypes have been approvedwith thermal and noise tests witnessed by official boardsand distinctive feature of Boldrocchi lies in its ownexpertise to design and to manufacture all themain components of a cooler.

5 The finned tubes,the heat exchanger , the fan, the circulatingpump and the electrical than Boldrocchi Oil Air coolers have beensupplied in the latest fifty TransformerEquipped with No. 4 x 240 kW Special DesignOil Air Coolers skid assembled with oil pumpsand control - Autotransformer 250 MVAE quipped with No. 4 x 240 kW tank mountedLow Noise Oil Air Coolers ROT/S - 65 dB(A) Power TransformerEquipped with No. 2 x 250 kW tank mountedOil Air coolers laid upon the other. Horizontal arrangementand horizontal air flow streamPOWER & DISTRIBUTIONTRANSFORMER OIL AIR COOLERS1122334 TRANSFORMER OIL AIR COOLERS(OFAF /ODAF)Power Rating range100 800 kW/eachAcoustic Pressure Level range80 55 dB(A)/eachNumber of axial No. 6 /eachAir draughtInducedForcedCooler MountingTank mountedSeparate batteryCooler ArrangementVertical / Horizontal air flow streamHorizontal / Horizontal air flow streamHorizontal / Vertical air flow streamThe cooler in standard execution consists of a finnedtubes bundle made of embedded type finned tubes,to ensure complete homogeneity and adhesionbetween tube and fins and a perfect heat finning machines are involved for theproduction of finned tubes, available in variousgeometries and different material combination.

6 ( standard)FINNED TUBESA luminium / Aluminium Copper / AluminiumCopper / CopperC-Steel / AluminiumStainless Steel / AluminiumTUBE PLATESA luminium C-SteelStainless steelParticular attention is paid to site atmosphere forchoosing the suitable material Aluminium Plant PechineyN. 2 transformers each one equippedwith separate batteryNo. 3 x 300 kW power rating Oil/Air CoolerNo. 3 x 510 kW power rating Oil/Air CoolerHindalco Steel Plant (India)Industrial transformers equippedwith separate battery No. 3 x 435 kWOil Air CoolersPower TransformerEquipped with No. 2 x 500 kW Oil Air coolerseach one on two cooling sectionINDUSTRIAL TRANSFORMEROIL AIR COOLERS445566513 The transformer oil is warmed by the heat losses of oil is conveyed into the shell side of the are used to lead the oil flow around the tubes incross flow. The cooling side on the tube side is divided intwo or more paths.

7 Two water paths are usually of single tube cooler executionWhen using the single tube coolers the oil pressure mustexceeds the water pressure in any operation, to avoidwater infiltration into the oil circuit in case of of double tube cooler executionUnlike single tube coolers, this execution of the tubebundle requires double tubes and doubled special safety design enables the operation withcooling water pressure not limited by the oil tube coolers in standard design are suitable for awater pressure of 10 case of leakage, water or oil are led into the chamberbetween the double tubes and the two tube plates,therefore the double tube system always prevents waterand oil from double tube design is the most valid solution toprotect the transformer, especially when, using sea orindustrial water, the site maintenance is not easy.

8 Shoulda leakage happen, an alarm is provided by a magneticfloat switch screwed to a collecting box fitting the TransformerEquipped with No. 3 x 150 kW OFWF coolerssingle tube executionEAF TransformerEquipped with No. 2 x 450 kW OFWF coolerssingle tube executionEAF Transformer50 MVA 35000 / 350 500 VEquipped with No 2 x 350 kW RDT 47/220 OFWF coolers double tube executionINDUSTRIAL TRANSFORMEROIL WATER COOLERS2123665 TRANSFORMER OIL TO WATER COOLERS(OFWF)Power Rating range60 2000 kW/eachNumber of radial No. 2/eachCooler MountingVertical Tank mountedHorizontal Tank mountedSeparate batteryCooler executionFixed tube plates (Tema BEM)Floating tube plates (Tema BEW)Single tubesDouble tubesFor both the above executions (single & double tubes)and depending on the cooling water the followingmaterials are used ( standard).SINGLE TUBESEXECUTIONT ubesCopper Admiralty brassCu/Ni 90/10 or 70/30 Stainless SteelTitaniumTube PlatesC-Steel Naval brassor Muntz metalCu/Ni 90/10 or 70/30 Stainless SteelTitaniumDOUBLE TUBESEXECUTIONO uter Tubes on Oil SideCopper C-Steel Inner Tubes on Water SideCopper Admiralty brassCu/Ni 90/10 or 70/30 Stainless SteelTitaniumTube PlatesC-Steel Naval brass or Muntz metalCu/Ni 90/10 or 70/30 Stainless SteelTitaniumFor naval application can be supplied OFWF coolersaccording to the requirements of the main marineregisters as:BVBureau VeritasDNVDet Norske VeritasLRSL loyds Register of ShippingRINAR egistro Italiano NavaleABSA merican Bureau of ShippingEAF Transformer50 MVA - 33000/363 680 VEquipped with No.

9 2 x 400 kW OFWF coolers single tube executionEAF Transformer84 MVA - 30000/490 990 VEquipped with No. 2 x 450 kW OFWF coolers double tube execution Furnace TransformerEquipped with No. 1 x 350 OFWF coolerdouble tube execution with n. 2 oil pumps,instruments and terminal box 44567 HYDRO-COOLERS (AFWF)Power Rating range3 100 kW/eachNumber of radial in operation/each + stand-byCooler executionSingle tubesDouble tubes For both the above executions (single & double tubes)and depending on the cooling water the followingmaterials are used ( standard).For naval application can be supplied OFWF coolersaccording to the requirements of the main marine regi-sters as:BVBureau VeritasDNVDet Norske VeritasLRSL loyds Register of ShippingRINAR egistro Italiano NavaleABSA merican Bureau of ShippingSINGLE TUBESEXECUTIONT ubesCopper Admiralty brassCu/Ni 90/10 or 70/30 Stainless SteelTitaniumFinsCopper Aluminium Tube PlatesC-Steel Naval brassor Muntz metalCu/Ni 90/10 or 70/30 Stainless SteelTitanium2 x 12,5 kW hydro-coolersdouble tube executions2 x 25 kW hydro-coolersdouble tube executions2 x 25 kW hydro-coolers doubletube executions.

10 Detail of motorremovable radiallyCAST RESIN TRANSFORMERAFWF COOLERSDOUBLE TUBESEXECUTIONO uter Tubes on Air SideCopper Inner Tubes on Water SideCopperAdmiralty brass Cu/Ni 90/10 or 70/30 Stainless SteelTitaniumFinsCopper AluminiumTube Plates on Air SideC-Steel Naval brassStainless SteelTitaniumTube Plates on Water SideNaval brass or Muntz MetalCu/Ni 90/10 or 70/30 Stainless SteelTitanium1231238456 RADIAL CIRCULATING OIL PUMPSS ingle block execution oil pump withimmersed motor, provided with correctrotation alarm device Capacity range: 6 44 lt/sFrequency:50 Hz 60 HzFeeding voltage: 230 Volt 690 VoltINLINE CIRCULATING OIL PUMPSS ingle block execution oil pump withimmersed motor Capacity range: 16 115 lt/sFrequency:50 Hz 60 HzFeeding voltage: 230 Volt 690 VoltAXIAL FLOW FANS(ONAF Cooling System)Acoustic Pressure Level range:70 dB(A) 53 dB(A)Standard range:740 mm | 1000 mm | 1250 mmmMotor poles range:6 | 8 | 10 | 12 | 14 | 16 Execution range:Steel galvanizedStainless steelAluminiumTransformer OilRadial Pump Series LBand sectional viewTransformer OilAxial Pump Series DNand sectional viewAxial Flow Fan VE740 Approved by EnelCOMPONENTS FOR POWERTRANSFORMERS4569 More than heavy duty electric motors arecooled with Boldrocchi attentionis paid to meet different requirements connected with cooling:dimensions, interface, pressure drop, materials, vibrations,noise, consumption.