radiatori-brochure 05.2020 - copia

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CONVETTC O O L I N G S Y S T E M S

Cooling waythe CONVETT s.r.l. managing director is Giuseppe Veller (MBA,

Bachelor in Electrical Engineerig) who came from a long

international experience around the world before successfully

taking over the company operations. We now offer the entire

range of cooling systems from the corrugated walls, radiators

and tanks to expandable radiator and oil forced-air forced heat

exchangers. These products are exported to East and West

Europe, North and South Africa, the far East and South America.

A short description of our milestones shows how we follow the mission since 1981:

1981 – the company was founded and radiator business was started up

1985 – first radiators automatic line

1990 – second radiators automatic line

1991 – start up of corrugated walls business with the second worldwide LAE

complete machine

1995 – certified ISO 9000

2000 – built a brand new plant of 4000 sqm with 500 sqm of offices

2000 – second corrugated walls automatic line

2001 – technology changed from solvent base to water based painting process

2005 – start up of production of Oil Forced Air Forced systems

2006 – new painting dipping automatic equipment with a water base

painting technology

2008 – new LAE corrugated walls press and seam welder MACPO 1600

2009 – third radiators automatic line with Kuka Robot technology

2009 – new LAE spot welding and strip welding machine

2010 – new robotic welding line for radiators

2011 – new equipment for finned tubes and building expansion for OFAF systems

2012 – new 4 step pre-treatment tunnel for painting line

2013 – start up of tank assembly business and new strip welding machine

2014 – certification of the Management System of Safety and Health at Work

OHSAS 18001: 2007

2015 – start up of expandable radiators business

2015 – new LAE corrugated walls press and seam welding unit MACPO 1000

2015 – patent for Italy n. IT2013VI00201 and for Europe n. WO2014IB63332

of ALUMINUM RADIATOR registered

2016 – new OMSG sand blasting machine and new painting line with

automatic flow coating unit

2017 – certification of Environmental Management System ISO 14001: 2015

2017 – certification of Quality requirements for fusion welding of metallic

materials - Part 2 ISO 3834

2017 – start up of Industry Convett 4.0 with a new ERP system and MES

2018 – third LAE corrugated walls press MACPO 1600 and seam

welder with strip welding

2019 – new front offices restyle with photovoltaic panels

– acquisition SALFER srl , transformers tank manufacturer

– acquisition NUOVA OFFICINA BEE, transformer tank manufacturer

During the years CONVETT s.r.l. restructured the company in a major way and invested in:

"new equipments and automatic assembly lines (in all the products we manufacture)

"human resources (recruiting and training)

"healt, safety and quality

"technology upgrades

RADIATORS

The Convett radiator is made using oval-section tubes of high grade steel. Each element is composed of nine tubes automatically welded and tested to two pressed steel caps 1.5 mm thick.

The radiator may be made up of a various number of elements (from 4 to 34), ranging in height from 800 to 3.500 mm.

Our radiator is manufactured following CEI-EN50216-6.

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MAIN DIMENSIONS

WIDTH 510 mm

ELEMENT PITCH 50 mm

ELIPTICAL TUBES THICKNESS 1,0 mm -1,1 mm -1,2 mm

CENTRE DISTANCE 800 mm -3.500 mm

N. OF ELEMENTS 4-34

ELEMENTS LOWERED 2-3 up to 1.000 mm reduction


DISSIPATION DIFFERENCE

Our present radiators are the result of a series of improvements due to experience and they offer considerable economic advantages. CONVETT radiators allow heat dissipation 30-35% higher than the radiators made of stamped plate. Indeed, for a 25.000 Kva transformer Italian Electrical Engineers use:

2

-No.19 stamped-plate radiators, I = 1900, N = 15 elements, m = 597

2

-No.16 CONVETT radiators, I = 1900, N = 15 elements, m = 432

2

-No.16 CONVETT radiators, I+EI=2100/1900, N= 13 elements, m = 406

Therefore the lower number of radiators used offers considerable advantages if compared with the usual radiator made of stamped plate:-better exploitation of the available space, thus achieving solutions which might seem impossible,

-saving of flanges and valves,

-saving of oil,

-saving in assembly and transportation costs,

-lower number of fans in case of ONAF,

-reduced transformer dimensions and lower weight.

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5 10 15 20 25 30 35

1.1

1.0

0.9

0.8

0.7

CONVETT

Stamped plate

N. of elem/rad

COEFFICIENT KN DIFFERENCE BETWEEN CONVETT RADIATORS AND STAMPED PLATE RADIATORS

DIAGRAMS KDH, KN, KP1000 1500 2000 2500 3000 3500

500

450

400

350

300

CONVETT

Stamped plate

2W/m

I(mm)

DISSIPATION DIFFERENCE BETWEEN CONVETT RADIATORS AND STAMPED PLATE RADIATORS


CONVENTIONALLY: kh = 600 mm kn = 18 elements kp = 1

350

340

330

320

310

300

290

280

270

260

250

240

230

220

50 52 54 56 58 60

+

CESI TEST REPORT: SPECIFIC DISSIPATION CURVE

2S

pec

ific

pow

er d

issi

pat

ed (

W/m

)

Hot oil temperature (°C)

CONVETT 1800 mm Stamped plate radiators 1800 mm +

+

1

0.99

0.98

0.97

0.96

0.95

0.94

0.93

0.92

0.91

0.9

0.89

0.88

0.87

kh

1

200 300 400 500 600

+ 0.9540

0.9714

CESI TEST REPORT: MAIN CHARACTERISTICS COEFFICIENTS - KH

kh

0.8809

0.8739

Barycenter quote differences (mm)


+

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1.035

1.03

1.025

1.02

1.015

1.01

1.005

1

0.885

kp

1.0343

80 40

+

1.0120

1.0139

CESI TEST REPORT: MAIN CHARACTERISTICS COEFFICIENTS - KP

kp

Panels distance (mm)


+0.9978+

1.05

1.04

1.03

1.02

1.01

1

0.99

0.98

0,97

0,96

0,95

0,94

0,93

kn

1

14 16 18 20 22

+

1

1.0203

CESI TEST REPORT: MAIN CHARACTERISTICS COEFFICIENTS - KN

kn

No. of ranks radiator (n.)


0.9883

0.9323

1.0434

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INTERNAL TREATMENT

Unless otherwise specified, it is implied that all internal surfaces will be accurately washed through the circulation of hot mineral oil for transformers in accordance with ISO 4406, filtered with a 120um net filter so as to leave as little impurity as possible in circulation.

CONVETT radiators design with its oval shape tube has an important competitive advantage against the stamped plate radiators even in the internal cleanness. In fact the oval shape of the tube is much smoother and much easier to clean then the stamped plate elements which are made by two coils sheets welded together with all the impurity that can be stocked between them.

If explicitly requested in the order, a degreasing treatment with solvents will be carried out together with internal painting using isolating resins resistant to hot oil, with a thickness of approximately 10 microns.

If explicitly required we can also paint the flanges in the area where you attach the valve, as shown in the picture below.

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EXTERNAL TREATMENT

External treatment depends on the external environment where the transformer is located and the warranty period required. Upon request we can provide you the suggested painting cycle for any specific environment.

In general find below a useful table based on:

-Standard ISO 9223:2012 Corrosion of metals and alloys -- Corrosivity of atmospheres - Classification. It

categorizes environments on the basis of wet time as well as sulphur dioxide and chloride contents.

-Standard ISO 9224:2012 Corrosion of metals and alloys -Corrosivity of atmospheres -Guiding values for the

corrosivity categories gives the corrosion rates of steel, zinc, copper and aluminium in the first five years.

-Standard EN ISO 12944-2:2017 Paints and varnishes -Corrosion protection of steel structures by protective

paint systems -Part 2: Classification of environments.

-Standard ISO 14713:2017 Protection against corrosion of iron and steel in structures - Zinc and aluminium

coatings.

Guidelines which gives examples of the environments in each corrosion category and the rates of corrosion for steel and zinc in the first years.

DEGREES OF CORROSION IN TERMS OF MATERIALS CONSUMPTION SPEED (UM/YEAR)

CORROSIVITY CATEGORY RATE OF CORROSION IN THE FIRST YEAR ISO 9223 and EN ISO 12944-2 EN ISO 14713 Carbon steel µm/year Zinc µm/year

C1 very low <= 1,3 <= 0,1

C2 low 1,3 - 25 0,1 - 0,7

C3 medium 25 - 50 0,7 - 2,1

C4 high 50 - 80 2,1 - 4,2

C5-I very high 80 - 200 4,2 - 8,4

C5-M very high 80 - 200 4,2 - 8,4

CATEGORIES OF ENVIRONMENT

CORROSIVITY CATEGORY ENVIRONMENT (guiding example) C1 Indoor spaces with occasional condensationVery low Outdoor air: inland rural

C2 Dry indoor spacesLow

C3 Indoor spaces with high moisture content, not much impuritiesMedium Outdoor air: inland urban, mildly saline C4 Indoor spaces: chemical industry, swimming pools, seaside docksHigh Outdoor air: inland industrial plants, seaside urban areas C5-I Outdoor air: very humid industrial atmosphereVery high C5-M Outdoor air: saline seaside atmosphereVery high

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SPAINTING PROCEDURE

Before any type of painting we treat 100% of the surface with a metallic sandblasting with white metal, in accordance with specifications SSPC-SP5-63 laid down by the Steel Structures Painting Council, with a maximum profile thickness of 60 µm. The appearance of the sandblasted surface must correspond to grade Sa3 contemplated by Svensk Standard SIS 055900-67. Within 24 hours we apply the primer coat to the radiator, to prevent oxidation. If explicitly requested in the order, hot-dip-galvanized radiators will be supplied, in accordance with UNI-EN ISO 1461 standards. The mechanical construction of our radiators prevents them from warping during hot-dip galvanization. In accordance with the environmental conditions, and the warranty required in cooperation with our paint supplier we can provide you with the recommended product and cycle.

Below please find some typical examples*:1. Regions like Saudi Arabia or Qatar require 220-240 µm NDFT** with acrylic or polyurethane top coat

2. Siberia require 170-180 µm NDFT** with acrylic or polyurethane top coat (-40C to 80C resistant)

3. Northern climates require hot dip galvanized steel with 100-140 µm NDFT** coating system

4. Particularly heavy industrial sites require 160-240 µm NDFT** epoxyurethane or acrylurethane coating

systems

* notes from www.megawilckens.com website ; ** NDFT = nominal dry film thickness


2If you need more technicals details on how to calculate how many m of tubular radiators you need, please go to our website www.convett.it

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* Capacity of elements without flange pipe and flange

RADIATORS CHARACTERISTICS


14,23

DIS

SIP

AT

ION

(W

/m2

)

RADIATORS HEIGHT (mm)

W/m2

550

650

600

450

500

350

400

300

250

1000 1500 2000 2500 3000 3500I (mm)

Δ T 55°

Δ T 60°

Δ T 40°

Δ T 50°

Δ T 45°

1.1

1.0

0.9

0.85 10 15 20 25 30 35

Number of elements

COEFFICIENT KN

KN coefficient where N isthe number of elementsfor each radiator

1.1

1.0

0.9

0.8100mm 500mm 1000mm

COEFFICIENT KDH

KDH Coefficient where HD isthe difference in height betweenthe nucleus center line and radiator

1.1

1.0

0.9

0.8550mm 650mm 750mm

COEFFICIENT KP

KP coefficient where P is thedifference between centers ofadjoining radiators (pitch)

The global coefficient will be KT=KDH x KP x KN

For ONAF cooling the efficiency increases by approximately 80%, with 4 m/s air speed andpressure of electric fan at 10mm. water.

RADIATORS DISSIPATION DIAGRAM

DIAGRAMS KDH, KN, KP

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PACKAGING

CONVETT has 30 years experience on packing and shipping radiators all over the world.The way we package our radiators is the result of many years continuous improvement.

ACCESSORIES AND SPECIAL REQUIREMENTS

Unless otherwise indicated, the radiators will be equipped with the following accessories:1.Steel rod side reinforcements with a diameter of 8 mm follow our standard corresponding:

-from 800mm up to 1200mm no reinforcements

-from 1200mm up to 2200mm one reinforcements

-from 2300mm up to 3000mm two reinforcements

-from 3100mm up to 3500mm three reinforcements

2.Two flanges with diameter of 80 mm.

3.Two lifting lugs (one above and one below).

4.Two punched plates with a diameter of 10 mm. (one above and one below) to join the assembled radiators

together.

5.Two 14 MA caps, one above for breather and one below for discharge.

6.One stainless steel washer welded to a hole in the flange so as to ensure metallic continuity (galvanic

contact) between the radiator/tank and earth.

7. Rubber caps.

8. Counterflange.

ON REQUEST:

-Fan attachments per your drawings (steel and Aisi).-Supply of radiator without flanges.-Specific attachments to the transformer: radiator parallel to the transformer.-Lowered external elements per customer drawing.-DIN breather and discharge caps.

And whatever else may be required by the customer.

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SINTERNAL ELEMENTS LOWERED - FR Type

FOR ORDERS

NR= Numbers of RADIATORS = .............................................................................................

I = Height = mm .................................................................................................................................................

Ne = Number of elements = .........................................................................................................

S = Flange distance = mm ..............................................................................................................

N = Radiator lenght = mm S+Ne x 50

EI = Height elevation = mm ...........................................................................................................

NTR = Number of lowered elements = 2

L = Reinforcement distance = Our Standard (dis. ELE-000)

ENVIROMENTAL CLASS CATEGORY:

C3 C4 C5 GALVANIZED

Final colour = RAL ..................................................................................................................................

Total Thickness = .......................................................min. ...................................................nom.


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ype

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S ALL ELEMENTS OF THE SAME HEIGHT - FG Type

FOR ORDERS

NR= Numbers of RADIATORS = .............................................................................................

I = Height = mm .................................................................................................................................................

Ne = Number of elements = .........................................................................................................

S = Flange distance = mm ..............................................................................................................

N = Radiator lenght = mm S+Ne x 50

L = Reinforcement distance = Our Standard (dis. ELE-000)

ENVIROMENTAL CLASS CATEGORY:

C3 C4 C5 GALVANIZED

Final colour = RAL ..................................................................................................................................

Total Thickness = .......................................................min. ...................................................nom.


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CONVETT s.r.l.36050 Bressanvido (VI)Via S. Benedetto,14/Q - ITALY Ph: +39.0444.460144Fax: [email protected]

SALFER s.r.l.36078 Valdagno (VI)Via Enrico Fermi, 7/B - ITALYPh: [email protected]

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