heat exchangers - · PDF fileDuring 1931 Boldrocchi tested and manufactured the first OFAF transformer oil cooler and since 1948 an engineering department has been exclusively devoted

heat exchangers

On the 3rd of March 1909 LUIGI BOLDROCCHI establishedthe activity with the first orders for the supply of ten centrifugal fans.

In 1911 the Officine Termo Meccaniche BOLDROCCHI was setup in Milan with a manufacturing area of 3000 square meters.

In 1914 the first plant for air pollution control was produced.

The company offered a wide range of products including radialand axial fans, fire-tube boilers, coolers, dryers, ventilating andheat-exchange units and plants.In 1926, the licence for the manufacture of finned tubes wasacquired in the USA and the production of extended surfaceheat-exchangers was developed.In the twenties and thirties the company becomes a regularsupplier of the main Italian industrial groups, the Ministry ofDefence, naval yards and State Railways.The first complete equipment to cool a power transformer wasdeveloped and supplied in 1931.

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 shipbuilders.In 1970, a new factory was built and, with some later extensions, forms the present headquarter.In the early 80’s, supplies for the nuclear sector induced the company to introduce a Quality AssuranceSystem. 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 ancillaries.Ecologia, a fusion of our traditional technology with the expertise of De Cardenas, purchased in 1997and active since 1926 in air pollution control and industrial fans.Boldrocchi 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 India.

HISTORICAL NOTES

Eng. Luigi Boldrocchi (1880-1949)Founder of the Boldrocchi Company

Techincal drawing of OFAF cooler ROT G VI 800 kW

OFAF cooler series ROT 48supplied in 1948

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In three separate workshops with a total 27.000square meter manufacturing area, Boldrocchiemploys 300 staff, among which 100 aretechnicians.The shops are equipped with thermal, acousticand aeraulic test facilities.

Boldrocchi production is divided into four mainlines: heat exchange (exchangers and coolers),fans, industrial noise protection and air pollutioncontrol. Today production is featured by highlyspecialised technical contents, many decades of'on site' experiences, flexibility in design and inproduction together with high quality standards.Supplies are tailor made to fulfil all Customers’specific requests. Boldrocchi Quality system iscertified according to ISO 9001 since 1993 andaccording to ASME Code since 1998.

A 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 Customers.

PRESENT SITUATION

AXIAL FANSVariable pitch bladesHigh efficiencyUse of special materials

AEROTO 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 DIVISIONFabric filters Electrostatic precipitatorsScrubbersMechanical collectorsGas coolers and conditioning towersHot gas ductsDust handlingBag filters and ESP revampingGas cleaning plants enhancementPlanned maintenance services

SERVICE DIVISIONProblem solving Field measurementsRebuilds and upgradesRevamping of existingComponent upgrade and overhaulCommissioning and erection supervisionPeriodic and preventive maintenance

POWER TRANSFORMER COOLERSOil to Air coolersOil to Water coolers single tubesOil to Water cooler double tubesLow noise fansAxial and radial pumps

MOTORS AND GENERATORS COOLERSAir-air coolers and air-water coolersExplosion proof and special equipmentComplete equipment with coolers,hoods, fans, filters and silencersHydrogen coolersOil bearings coolersHeavy duty axial fans

EXCHANGERSAir coolers for refinery service and forother industrial purposeShell and tube heat exchangersSurface condenserGas heaters and coolersAir pre-heatersFinned tube coolers and heaters.

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RADIAL FANSFor industrial applicationFlow rate : up to 600 m 3/sPressure : up to 80 kPaShaft power : up to 8.000 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 transformers

Rotating electrical machineMotorsGenerators

More 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 costs.

Test 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 requestedperformances.

The most used coolers’ prototypes have been approvedwith thermal and noise tests witnessed by official boardsand customers.

A distinctive feature of Boldrocchi lies in its ownexpertise to design and to manufacture all themain components of a cooler: the finned tubes,the heat exchanger, the fan, the circulatingpump and the electrical devices.

More than 15.000 Boldrocchi Oil Air coolers have beensupplied in the latest fifty years.

Power TransformerEquipped with No. 4 x 240 kW Special DesignOil Air Coolers skid assembled with oil pumpsand control devices.

ENEL - Autotransformer 250 MVAEquipped 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 stream

POWER & DISTRIBUTIONTRANSFORMER OIL AIR COOLERS

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TRANSFORMER OIL AIR COOLERS(OFAF /ODAF)Power Rating range

100 ÷ 800 kW/eachAcoustic Pressure Level range

80 ÷ 55 dB(A)/eachNumber of axial fans

No.1 ÷ No. 6 /eachAir draught

InducedForced

Cooler MountingTank mountedSeparate battery

Cooler ArrangementVertical / Horizontal air flow streamHorizontal / Horizontal air flow streamHorizontal / Vertical air flow stream

The 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 transfer.

Special finning machines are involved for theproduction of finned tubes, available in variousgeometries and different material combination.(� standard)

FINNED TUBES

Aluminium / Aluminium �Copper / AluminiumCopper / CopperC-Steel / AluminiumStainless Steel / Aluminium

TUBE PLATES

Aluminium �C-SteelStainless steel

Particular attention is paid to site atmosphere forchoosing the suitable material

Aluminium Plant PechineyN.° 2 transformers each one equipped

with separate batteryNo. 3 x 300 kW power rating Oil/Air CoolerNo. 3 x 510 kW power rating Oil/Air Cooler

Hindalco Steel Plant (India)Industrial transformers equipped

with separate battery No. 3 x 435 kWOil Air Coolers

Power TransformerEquipped with No. 2 x 500 kW

Oil Air coolerseach one on two cooling section

INDUSTRIAL TRANSFORMEROIL AIR COOLERS

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The transformer oil is warmed by the heat losses of thewindings.

The oil is conveyed into the shell side of the cooler.Baffles 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. Two water paths are usually used.

Features 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 leakage.

Features of double tube cooler executionUnlike single tube coolers, this execution of the tubebundle requires double tubes and doubled tube-plates.This special safety design enables the operation withcooling water pressure not limited by the oil pressure.Double tube coolers in standard design are suitable for awater pressure of 10 bar.

In 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 mixing.

The double tube design is the most valid solution toprotect the transformer, especially when, using sea orindustrial water, the site maintenance is not easy. Shoulda leakage happen, an alarm is provided by a magneticfloat switch screwed to a collecting box fitting the cooler.

EAF TransformerEquipped with No. 3 x 150 kW OFWF coolerssingle tube execution

EAF TransformerEquipped with No. 2 x 450 kW OFWF coolerssingle tube execution

EAF Transformer50 MVA – 35000 / 350 ÷ 500 VEquipped with No 2 x 350 kW RDT 47/220OFWF coolers double tube execution

INDUSTRIAL TRANSFORMEROIL WATER COOLERS

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TRANSFORMER OIL TO WATER COOLERS(OFWF)

Power Rating range60 ÷ 2000 kW/each

Number of radial pumpsNo.1 ÷ No. 2/each

Cooler MountingVertical Tank mountedHorizontal Tank mountedSeparate battery

Cooler executionFixed tube plates (Tema BEM)Floating tube plates (Tema BEW)Single tubesDouble tubes

For both the above executions (single & double tubes)and depending on the cooling water the followingmaterials are used (� standard).

SINGLE TUBESEXECUTION

TubesCopper �Admiralty brassCu/Ni 90/10 or 70/30Stainless SteelTitanium

Tube PlatesC-Steel �Naval brassor Muntz metalCu/Ni 90/10 or 70/30Stainless SteelTitanium

DOUBLE TUBESEXECUTION

Outer Tubes on Oil SideCopper �C-Steel �

Inner Tubes on Water SideCopper �Admiralty brassCu/Ni 90/10 or 70/30Stainless SteelTitanium

Tube PlatesC-Steel �Naval brass or Muntz metalCu/Ni 90/10 or 70/30Stainless SteelTitanium

For naval application can be supplied OFWF coolersaccording to the requirements of the main marineregisters as:

BV Bureau VeritasDNV Det Norske VeritasLRS Lloyds Register of ShippingRINA Registro Italiano NavaleABS American Bureau of Shipping

EAF Transformer50 MVA - 33000/363 ÷ 680 V

Equipped with No. 2 x 400 kW OFWFcoolers single tube execution

EAF Transformer84 MVA - 30000/490 ÷ 990 V

Equipped with No. 2 x 450 kW OFWFcoolers double tube execution

Furnace TransformerEquipped with No. 1 x 350 OFWF cooler

double tube execution with n.° 2 oil pumps,instruments and terminal box

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HYDRO-COOLERS (AFWF)Power Rating range

3 ÷ 100 kW/eachNumber of radial fans

No.2 in operation/each �No.1+ No.1 stand-by

Cooler executionSingle tubesDouble tubes �


For naval application can be supplied OFWF coolersaccording to the requirements of the main marine regi-sters as:

BV Bureau VeritasDNV Det Norske VeritasLRS Lloyds Register of ShippingRINA Registro Italiano NavaleABS American Bureau of Shipping



FinsCopper �Aluminium �


2 x 12,5 kW hydro-coolersdouble tube executions

2 x 25 kW hydro-coolersdouble tube executions

2 x 25 kW hydro-coolers doubletube executions. Detail of motorremovable radially

CAST RESIN TRANSFORMERAFWF COOLERS


Outer Tubes on Air SideCopper �

Inner Tubes on Water SideCopperAdmiralty brass �Cu/Ni 90/10 or 70/30Stainless SteelTitanium

FinsCopper �Aluminium

Tube Plates on Air SideC-Steel �Naval brassStainless SteelTitanium

Tube Plates on Water SideNaval brass � or Muntz MetalCu/Ni 90/10 or 70/30Stainless SteelTitanium

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RADIAL CIRCULATING OIL PUMPSSingle 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 Volt

INLINE CIRCULATING OIL PUMPSSingle block execution oil pump withimmersed motor Capacity range: 16 ÷ 115 lt/sFrequency: 50 Hz ÷ 60 HzFeeding voltage: 230 Volt ÷ 690 Volt

AXIAL 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 | 16Execution range:Steel galvanizedStainless steelAluminium

Transformer OilRadial Pump Series LB

and sectional view

Transformer OilAxial Pump Series DN

and sectional view

Axial Flow Fan VE740Approved by Enel

COMPONENTS FOR POWERTRANSFORMERS

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More than 26.000 heavy duty electric motors arecooled with Boldrocchi equipment. Particular attentionis paid to meet different requirements connected with cooling:dimensions, interface, pressure drop, materials, vibrations,noise, consumption, reliability and maintenance.

Innumerable configurations have been designed.C.A.D./C.A.M. solutions have been adopted to reducedelivery time, even for special solutions.

The water-air coolers are supplied both as coiltype and with finned tubes.

Several tube materials are available: copper,copper alloys, stainless steels and titanium.

For heavy-duty applications, such as offshoreplatforms, a double tube design is suggested,with titanium internal tube.

The groups are equipped with control devices,special versions and explosion proof type aresupplied as well.

The production range includes:Cooling groups for D.C. motorsThese units, directly coupled to the motor, areusually composed of a steel hood containingthe water/air heat exchanger, an air filterand a fan. All the components are easilyremovable from the casing for inspectionsand maintenance;Air-Air cooling groupsThese units are composed of two separatedcircuits with two fans and an exchanger,where the closed circuit air is cooled by theexternal air.Air-Water cooling groups for A.C. motorsThese units are equipped with one or moreair/water exchangers, fan and noise insulatingsystems.

CACA generator cooler585 kW power rating,equipped with No. 4Comet axial fans.

CACA generator cooler300 kW power rating,equipped with No. 4Comet axial fans.

CACA generator cooler300 kW power rating, Inletsilencers view.

A.C./D.C.MOTOR COOLERS 1

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The production range for generator coolers includes:

Air-Water coolers available in several designs and withdifferent materials: copper alloys, stainless steel and titanium.

Coolers for hydrogen in closed circuits. These units areparticularly sturdy, have considerable dimensions and aredesigned to operate in presence of high vibrations.

Circular coil heat-exchangers to cool the bearing lubricatingoil of large generators and turbines.

Medium head axial fans for cooling air circulation.The construction and the impeller are designed to operate withhigh rotating speed, up to 3.000 rpm and discontinuously. Strictacceptance tests are carried out in excess of the over speedtest at 75 Hz.

CACW eexd motorcooler equipped with instruments

for air pressurization

CACW D.C. motor cooler 130 kWpower rating; equipped with

external fan and filter

CACW generator cooler 580 kWpower rating

CACW double tube coolers forship propulsion motor 6100 kW

No. 2 x 120 kW cooler powerrating, equipped with

No. 4 radial fans.

GENERATORCOOLERS4

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AIR TO AIR COOLERS (CACA)Power Rating range

200 ÷ 1.000 kW/eachNumber of axial fans

No. 2 ÷ No. 3 in operation/each �+ No. 1 stand-by/each

UNIT EXECUTIONTubes

Aluminium alloyC-SteelStainless steel

Tube PlatesC-SteelStainless Steel

HousingC-SteelStainless Steel

SilencersProvided with panel protected by perforated sheetin galvanized C-Steel or Stainless Steel

The cooling unit standard execution is provided with silencersand fans in vertical or horizontal arrangement.

CACA generatorcooler equipped withNo. 3 vertical axial fans.

CACW coolerfor synchronous motor,complete with piping,valves and leakagedetector system

A.C./D.C.MOTOR COOLERS

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AIR TO WATER (CACW)Power Rating range

80 ÷ 900 kW/eachNumber of radial fans

No. 1 ÷ No. 2 operation/eachNo. 1 ÷ No. 2 in operation/each+ No. 1 stand-by/each

Cooler executionSingle tubesDouble tubes


CACW double tube coolerequipped with No. 4 coolers,

No. 4 fans and induction motors.

CACW cooler for A.C. motor.Cooling tubes, tube plates

and water headers: titanium

CACA cooler.Detail of centralization

terminal box

CACW double tube sea-water coolerfor Derrick drilling motor

on off-shore platform

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Outer Tubes on Air SideCopper �

Inner Tubes on Water SideCopperAdmiralty brass �Cu/Ni 90/10 or 70/30Stainless SteelTitanium


Tube Plates on Air SideC-Steel �Naval brassStainless SteelTitanium

Tube Plates on Water SideC-Steel �Naval brass or Muntz metalCu/Ni 90/10 or 70/30Stainless SteelTitanium

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Boldrocchi Company designs and manufactures a widerange of air cooled heat exchangers, used worldwide inutilities and industrial applications; serving the petroleum,chemical, gas processing, electrical, power generation,environment and steel industries.From small coolers for endothermic engines, for compressorsand dryers up to several banks of bundles for vapourscondensation and for petrochemical processes.

The production includes fin fan coolers for:

With the support of an on-going R&D dep., Boldrocchi canconstantly improve its products. A computer aided designnetwork speeds up technical work and enable engineers toexamine different approaches and to reach the bestsolutions.

High efficiency and low noise fans are provided by thedaughter Company COMET, strictly related with our designdepartment.

Gaseous and liquid hydrocarbons,steam and vapoursWater and lube oil closed circuit systemHigh pressure intercooler and aftercoolerCompressed air and gasesSpecial applicationsgas heaters and coolersair pre-heater and heat recuperators

Plant: OFF-SHORE WHITETIGER FIELD (VIETNAM )N.4 GAS COOLER (Total 24Tube Bundles)Total Duty: 19.100 kWDesign Pressure: 120 barTotal Installed Power: 416 kW

Plant: AUGUSTA REFINERY(ITALY)SPLITTER OVERHEADCONDENSER (Duplex material construction)Duty: 6.400 kWDesign Pressure: 6 barTotal Installed Power: 148 KwREACTOR EFFLUENT COOLER Duty: 3.900 kWDesign Pressure: 21.5 barTotal Installed Power: 120 kW

Plant: SARPOM REFINERY(ITALY) REACTOR EFFLUENTCOOLER Duty: 4.500 kWDesign Pressure: 23 barTotal Installed Power: 120 kW

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AIR COOLEDHEAT EXCHANGERS

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N.30 WATER GLYCOLCLOSED CIRCUITCOOLERSSix Different PowerPlants (IRAN)Total Duty: 73.500 KwDesign Pressure: 6 barTotal InstalledPower: 88 kW

N. 2 CLOSEDCIRCUIT WATERCOOLERSPlant: Power BargeProject (GHANA)Total Duty: 5.100 kWDesign Pressure: 6 barTotal InstalledPower: 240 kW

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All projects involve a process of:thermal design according to current and well established operating techniques and usingworldwide recognized software;mechanical design according to the mainstandard codes such as TEMA, ASME, API and supply of pressure parts stamped with CE,PED or U mark;structural and stress analysis with finiteelement methods;design solutions for low noise levelinstallations.optimizing the required power, ensuring easy transportation, installation and maintenance.

To find out the best performance for each case,ensuring heat transfer coefficient combined with lowpressure drops, Boldrocchi provides several types ofspiral finned tubes.A variety of base tubes: from 1/2 inch to 2 inchdiameters and different metals such as carbon steels,stainless and special steels, copper alloys, aluminiumand titanium can be finned with several sizes andmaterials to satisfy customer and designrequirements.Based on a lot of different fining machines Boldrocchican supply three basic configurations on finned tubes

A task force of skilled craftsmen combined with thebest welding techniques ensures high quality welding,guaranteed by radiographic, ultrasonic, magnetic andliquid in-depth inspections and, after assembly,hydrostatic and leak testing.

More than 200 welding procedures have beenqualified and tested by international Boards.

LP and HP CompressorNatural Gas Coolers.Plant: BANGLAN BAY (U.K.).Duty: 4000 kW Design Pressure: 83 barInstalled Power: 60 kW

HP Compressor Natural GasAfter coolers.Plant: CORTEMAGGIORE(ITALY).Duty: 3800 kWDesign Pressure: 206 barInstalled Power: 74 kW

HP Cover Plate Headers.Plant: ZARQA (JORDAN).Design Pressure: 60 bar

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LUBE OIL COOLERS Plant: MELLITAH (LIBYA) Duty: 6400 KwDesign Pressure: 13 barInstalled Power: 110 kW

LUBE OIL COOLERwith turbulator promotersinside tubes and externalrecirculation systemPlant: KASHAGANFIELD DEVELOPMENT(KAZAKHSTAN) Duty: 128 kWDesign Pressure: 6 barInstalled Power: 6.6 kW


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G-Type Fins (mechanically embedded)Rectangular cross-section fin wrappedunder tension and mechanically embedded in a groove spirally cut intothe outside surface of a tube.Can be used for maximum DesignProcess Temperature of 400°C

L-footed FinsL-shaped fin wrapped under tensionover the outside surface of a tube,with the tube fully covered by the feetbetween the fins. Can be used for maximum DesignProcess Temperature of 130°C

KLM- Knurled footedL-shaped fin wrapped under tensionover the outside surface of a tube,while the foot of the fin simultaneouslypressed into the ribbed outer surfaceof the tube.Can be used for maximum DesignProcess Temperature of 200°C

G-Type BoldrocchiDouble Tubes

Boldrocchi extruded LowFin Tube (TRUFIN)

TECHNOLOGY

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Boldrocchi Test FacilitiesHeat Run Test witnessed by ENEL

Low Noise Transformer OilAir Cooler 65 dB(A)

Power rating ROT/S 300 kW

Boldrocchi Test FacilitiesHeat Run Test

Transformer Oil Water Cooler DoubleTube Execution

Power rating 315 kW

Boldrocchi Test FacilitiesHeat Run Test

Air Water Motor Cooler Double TubeExecution

Power rating 200 kW

Finite Element AnalysisAxial fan blades

Exchanger headers

R&D

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MAIN CUSTOMERS

POWER TRANSFORMERS COOLERSABB Group (Brazil - Canada - Germany - Italy - Spain - Switzerland - Turkey - USA) | ACEA | AEM

AREVA (Brazil - Turkey - United Kingdom) | EDIPOWER | EDISON | ENEL | ENERCO Enterprises | GANZ Transelektro | GETRA | IMEFY |JST Transformateurs | PAUWELS TRAFO | SEA | SGB | SIEMENS Group (Austria - Italy)

SPECIALTRASFO | TAMINI Group | TERNA | TES | TIRONI

MOTOR AND GENERATOR COOLESABB Sace Vittuone | ABB Automation Västeräs Svezia | ABB Oy Electrical Maschines Finland

ABB Switzerland Ltd Electrical Machines | Brush HMA B.V Ridderkerk NetherlandsCantarey Reinosa S.A.U | Laurence Scott & Electromotors LTD

AIR COOLER HEAT EXCHANGERSABB GROUP | AGIP | AGIPPETROLI | ANSALDO ENERGIA | ANSANDO CALDAIE | API | BURCKHARDT | CCT | DRESSER RAND ENEL \ ENI | ENICHEM |

ESSO | FOSTER WHEELER | HOWDEN COMPRESSORS | INGERSOLL RAND | ISG | JORDAN PETROLEUM | K.T.I. | KUWAIT NAT. PETROLEUM Co | LINDE |LUMMUS GLOBAL | LURGI | MAN TURBO | MACCHI | PERRY EQUIPMENT | POLIMERI EUROPA | RAFFINERIA DI ROMA | SARAS | SICES | SIIRTEC NIGI |

SNAMPROGETTI | STOGIT SYRIAN P.E.E. | TECHINT | TECHNIP COFLEXID | TECNIMONT | TERMOMECCANICA | TRACTEBELL | UHDE

BOLDROCCHI FACTORY IN ARCORE

BOLDROCCHIFACTORY IN BIASSONO

Ed.

01/

2007

BOLDROCCHI HEADQUARTERS: Viale Trento e Trieste 93 - 20046 BIASSONO (MI) - ItalyPhone +39-039-2202.1 - Fax +39-039-2754200

Web Site: www.boldrocchi.it - e-mail: [email protected]

FACTORY: Via Buonarroti 66 - 20043 ARCORE (MI) - ItalyPhone +39-039-617515 - Fax +39-039-6014451

BOLDROCCHI INDIA: OFFICE AND FACTORY - CHENNAI - IndiaPhone +91.44.23713359 - Fax +91.44.24899321 - e-mail: [email protected]

SALES OFFICE - DELHI - IndiaPhone/Fax +91.124.5062498 - e-mail: [email protected]

heat exchangers - · PDF fileDuring 1931 Boldrocchi tested and manufactured the first OFAF transformer oil cooler and since 1948 an engineering department has been exclusively devoted

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