Power transformer and reactor fittings - Part 9: Oil-to-water heat exchangers

EN 50216-9 deals with oil-to-water heat exchangers that means a heat exchanger for the cooling of the transformer oil using a forced oil circuit and a forced water circuit. The oil-side of the oil-to-water heat exchangers is not included in the scope of the Pressure Equipment Directive 97/23/EC according to Article 1, § 3.12. The water-side falls into Article 3, § 3 of the Pressure Equipment Directive, therefore the rating plate must not contain a CE sign according to Article 15 of the Pressure Equipment Directive. This standard establishes essential dimensions and the requirements to ensure interchangeability and adequate mounting of the oil-to-water heat exchangers. This standard applies for dimensions and requirements of oil-to-water heat exchangers. The increase of versions of oil-to-water coolers with higher ratings and constructional changes as well are considered in the revised standard.

Zubehör für Transformatoren und Drosselspulen - Teil 9: Öl-Wasser-Kühler

EN 50216-9 behandelt Öl-Wasser-Kühler, d. h. Wärmetauscher für die Kühlung von Transformatorenöl mittels erzwungenem Ölumlauf und mittels erzwungenen Wasserumlaufs. Die Ölseite des Öl-Wasser-Kühlers fällt nach Artikel 1, § 3.12 der Druckgeräte-Richtlinie 97/23/EG nicht in deren Anwendungsbereich. Die Wasserseite fällt unter Artikel 3, § 3 der Druckgeräte-Richtlinie, nach Artikel 15 der Druckgeräte-Richtlinie darf deshalb das Leistungsschild kein CE-Zeichen enthalten. Diese Norm legt grundlegende Abmessungen und Anforderungen fest, um die Austauschbarkeit und einheitliche Montage der Öl-Wasser-Kühler sicherzustellen.

Accessoires pour transformateurs de puissance et bobines d'inductance - Partie 9: Echangeurs thermiques huile-eau

La EN 50216-9 traite des échangeurs thermiques huile-eau, ce qui signifie un échangeur thermique pour le refroidissement de l'huile de transformateur en utilisant un circuit à huile forcée et un circuit à eau forcée. Le coté huile des échangeurs thermiques huile-eau n'est pas traité par l'Article 1, § 3.12 de la Directive 97/23/CE relative aux Equipements sous pression. Le coté eau étant régi par l'Article 3, § 3 de la Directive 97/23/CE relative aux Equipements sous pression, par conséquent, il n'est pas nécessaire que la plaque signalétique de l'appareil comporte le marquage CE prévu par l'Article 15 de cette même Directive. La présente norme établit les dimensions essentielles et les exigences pour assurer l'interchangeabilité et le bon montage des échangeurs thermiques huile-eau.

Armature močnostnih transformatorjev in dušilk - 9. del: Toplotni izmenjevalnik olje-voda

General Information

Status
Withdrawn
Publication Date
30-Apr-2009
Withdrawal Date
31-Oct-2011
Technical Committee
Drafting Committee
Parallel Committee
Current Stage
9960 - Withdrawal effective - Withdrawal
Start Date
12-Apr-2022
Completion Date
12-Apr-2022

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SLOVENSKI STANDARD
SIST EN 50216-9:2009
01-maj-2009
$UPDWXUHPRþQRVWQLKWUDQVIRUPDWRUMHYLQGXãLONGHO7RSORWQLL]PHQMHYDOQLN
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Power transformer and reactor fittings - Part 9: Oil-to-water heat exchanger
Zubehör für Transformatoren und Drosselspulen - Teil 9: Öl-Wasser-Kühler

Accessoires pour transformateurs de puissance et bobines d'inductance - Partie 9:

Echangeur thermique huile-eau
Ta slovenski standard je istoveten z: EN 50216-9:2009
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
SIST EN 50216-9:2009 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50216-9:2009
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SIST EN 50216-9:2009
EUROPEAN STANDARD
EN 50216-9
NORME EUROPÉENNE
March 2009
EUROPÄISCHE NORM
ICS 29.180
English version
Power transformer and reactor fittings -
Part 9: Oil-to-water heat exchangers
Accessoires pour transformateurs Zubehör für Transformatoren
de puissance et bobines d'inductance - und Drosselspulen -
Partie 9: Echangeurs thermiques huile-eau Teil 9: Öl-Wasser-Kühler

This European Standard was approved by CENELEC on 2008-10-21. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50216-9:2009 E
---------------------- Page: 3 ----------------------
SIST EN 50216-9:2009
EN 50216-9:2009 – 2 –
Foreword

This European Standard was prepared by the Technical Committee CENELEC TC 14, Power

transformers.

The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50216-9 on

2008-10-21.

This European Standard is to be read in conjunction with EN 50216-1:2002, Power transformer and

reactor fittings - Part 1: General.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-11-01
__________
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SIST EN 50216-9:2009
– 3 – EN 50216-9:2009
Contents

1 Scope ......................................................................................................................................................... 4

2 Normative references ............................................................................................................................... 4

3 Definitions ................................................................................................................................................. 4

4 Requirements ............................................................................................................................................ 5

4.1 Rated values ..................................................................................................................................... 5

4.2 Rated cooling capacity ...................................................................................................................... 6

4.3 Mechanical design ............................................................................................................................ 6

4.4 Corrosion protection ......................................................................................................................... 7

5 Designation ............................................................................................................................................... 7

5.1 Designation of the heat exchangers ................................................................................................. 7

5.2 Rating plate information .................................................................................................................... 7

6 Tests ........................................................................................................................................................... 8

6.1 Routine tests ..................................................................................................................................... 8

6.2 Type tests ......................................................................................................................................... 9

7 Preparation for transport and storage .................................................................................................... 9

8 Mounting and service, service conditions ............................................................................................. 9

Annex A (normative) Details to the heat exchangers .................................................................................. 10

Annex B (normative) Rating conditions of the heat exchangers ............................................................... 17

Annex C (informative) Example for calculation of capacity in service ...................................................... 23

Bibliography .................................................................................................................................................... 24

Figures

Figure A.1 – Collection and forms of suspensory types ................................................................................... 11

Figure A.2 – Collection and forms of horizontal types ...................................................................................... 12

Figure A.3 – Collection and forms of vertical standing types ............................................................................ 13

Figure B.1 – Capacity factor depending on inlet temperatures of oil and water ............................................... 19

Figure B.2 – Capacity factor depending on mass for plain tubes ..................................................................... 20

Figure B.3 – Capacity factor depending on mass for finned tubes ................................................................... 21

Tables

Table A.1 – Devices .................................................................................................................................... 14

Table A.2 – Examples for material selection depending on water quality ..................................................... 16

Table A.3 – Average values for chemically neutral water (fresh water) ........................................................ 16

---------------------- Page: 5 ----------------------
SIST EN 50216-9:2009
EN 50216-9:2009 – 4 –
1 Scope

EN 50216-9 deals with oil-to-water heat exchangers that means a heat exchanger for the cooling of the

transformer oil using a forced oil circuit and a forced water circuit.

The oil-side of the oil-to-water heat exchangers is not included in the scope of the Pressure Equipment

Directive 97/23/EC according to Article 1, § 3.12. The water-side falls into Article 3, § 3 of the Pressure

Equipment Directive, therefore the rating plate must not contain a CE sign according to Article 15 of the

Pressure Equipment Directive.

This standard establishes essential dimensions and the requirements to ensure interchangeability and

adequate mounting of the oil-to-water heat exchangers.
2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendment) applies.
EN 50216-1:2002 Power transformers and reactor fittings - Part 1: General

EN 60296 Fluids for electrotechnical applications - Unused mineral insulating oils for transformers

and switchgear (IEC 60296)

EN 60721-3-4 Classification of environmental conditions - Part 3: Classification of groups of

environmental parameters and their severities - Section 4: Stationary use at non-

weatherprotected locations (IEC 60721-3-4)

EN 1092-1 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories ,

PN designated - Part 1: Steel flanges
EN 1561 Founding - Grey cast irons

EN 1653 Copper and copper alloys - Plate, sheet and circles for boilers, pressure vessels and

hot water storage units

EN 10025:1990 Hot rolled products of non-alloy structural steels - Technical delivery conditions

EN 10027-2 Designation systems for steels - Part 2: Numerical system

EN 10088-2 Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of

corrosion resisting steels for general purposes

EN 10130 Cold rolled low carbon steel flat products for cold forming - Technical delivery

conditions
EN 12451 Copper and copper alloys - Seamless, round tubes for heat exchangers

EN 12452 Copper and copper alloys - Rolled, finned, seamless tubes for heat exchangers

EN 12502-1 Protection of metallic materials against corrosion - Guidance on the assessment of

corrosion likelihood in water distribution and storage systems - Part 1: General

EN ISO 3506-1 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 1: Bolts,

screws and studs (ISO 3506-1)

ISO 4406 Hydraulic fluid power - Fluids - Methods for coding the level of contamination by solid

particles
Replaced by EN 10025 series, Hot rolled products of structural steels.
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SIST EN 50216-9:2009
– 5 – EN 50216-9:2009
3 Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
single tube

tube conducting the water in the oil filled compartment, either plain tubes which have the inner water side

and the outer oil side with plain surface or finned tubes which have the outer oil side finned for increasing

the heat transfer area from oil to tube
3.2
double tube

consists of two telescope tubes without blocking fluid. The inner water side of the inside tube is a plain

tube. The outer oil side of the outside tube is either a plain tube or a finned tube. The inner side of the

outside tube or the outer side of the inside tube has regularly groves for the leakage detection

3.3
tube bundle

number of parallel tubes to get the adequate heat transfer surface and the appropriate plates

3.4
single tube arrangement

the heat exchange from oil to water is conducted with a bundle of single tubes. For safety reasons of the

transformer the oil pressure outside the tubes must always have a higher value than the water pressure

inside the tubes, so that even in the case of heat exchanger untightness no water penetrates into the

transformer oil
3.5
double tube arrangement

the heat exchange from oil to water is conducted with a bundle of double tubes. The double tube system

has sufficient security for the transformer. The oil pressure outside the tubes may be less than the water

pressure inside the tubes
3.6
tube plate

the cooling tubes are rolled or welded oil-tight and/or water tight on both ends into the plates - for double

tubes one end into two plates, for single tubes into one plate. With the tube plates the oil side is tightened

against the water side
3.7
water channel
the water side of the heat exchanger is connected via the water channels
3.8
leakage detection

due to a leakage oil or water in the space between the double tubes would be detected

4 Requirements
4.1 Rated values
Values for inquiry (minimum):
- single tube / double tube heat exchanger
- water quality (see A.6)
- rated cooling capacity Q kW
- water temperature at inlet t’ °C
- water temperature at outlet (max.) t’’ °C
- average oil temperature t °C
- oil temperature difference (min. value/max. value) ∆t K
- water flow quantity (max.) V m³/h
- max. operating pressure (water side) p kPa
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SIST EN 50216-9:2009
EN 50216-9:2009 – 6 –
For an order the following rated values should be fixed:
- single tube / double tube heat exchanger
- materials
- rated cooling capacity Q kW
- rated water flow quantity V m³/h
- rated oil flow quantity V m³/h
- water temperature at inlet t’ °C
- water temperature at outlet t’’ °C
- oil temperature at inlet t’ °C
- oil temperature at outlet t’’ °C
- water side pressure drop ∆p kPa
- oil side pressure drop ∆p kPa
- max. operating pressure (water side) p kPa
- max. operating pressure (oil side) p kPa
4.2 Rated cooling capacity

The rated cooling capacity of the heat exchanger is the minimum capacity, which the manufacturer has to

guarantee. For a heat exchanger in new condition the value is based on the following:

- rated water and oil flow quantities in connection with the particular permitted static pressure drops;

- oil-to-water heat exchangers must be designed with a capacity margin of min. 25 %.

For new heat exchangers the capacity with the margin has to be achieved with the rated values for oil flow

quantity, water flow quantity, oil temperature at inlet and water temperature at inlet.

4.3 Mechanical design

The mechanical design is based on the ambient conditions according to EN 50216-1, Clause 3, and on a

maximum oil temperature of 100 °C and a maximum water temperature of 50 °C. Deviating temperatures

and ambient conditions as well as other insulating fluids must be agreed between manufacturer and

purchaser.

The cooling tubes and plates are oil tight and water tight connected. The tube bundle could expect the

following execution (execution be agreed between manufacturer and purchaser):
- one side with floating head cover, the bundle can be pulled out;
- fixed tube plate and stationary heads.

The water channels are removable and can separately be emptied. Removing of a water channel must not

influence the oil circuit.
On the oil-side the heat exchanger must be vacuum proof.

The heat exchanger has to be designed for unprotected outdoor installation. The heat exchanger must be

completely drainable and ventable on the oil side and on the water side.
For material selection criteria refer to A.6.

The maximum permissible oil pressure in service for the heat exchanger is limited to 350 kPa.

The maximum permissible water pressure in service for heat exchanger with single tubes is limited to

340 kPa.

The maximum permissible water pressure in service for heat exchanger with double tubes is limited to

800 kPa .

For higher water pressure in service, design and test values must be enlarged adequate and the rules of PED 97/23/EC must be

followed.
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SIST EN 50216-9:2009
– 7 – EN 50216-9:2009
4.4 Corrosion protection
Common screws and nuts: Stainless steel according to EN ISO 3506-1.
4.4.1 Inner surface water side (standard)

Water channels are protected with epoxy coating. Thickness minimum 150 µm or according to special

agreement.
Several selections are given in Table A.2.
4.4.2 Inner surface oil side (standard)
3)
Oil resistant protection, minimum resistant for 100 °C temperature.
4.4.3 Outer surface

Corrosion protection and coating must be agreed between manufacturer and purchaser. The required

environmental conditions must be followed.
The severities of the environmental conditions are classified in EN 60721-3-4.
5 Designation
5.1 Designation of the heat exchangers
The following oil-to-water heat exchangers are differentiated:
- single tube arrangements
Type OWSA oil-water heat exchanger with single tubes,
vertical suspensory type
Type OWSB oil-water heat exchanger with single tubes,
horizontal type
Type OWSC oil-water heat exchanger with single tubes,
vertical standing type
- double tube arrangements
Type OWDA oil-water heat exchanger with double tubes,
vertical suspensory type
Type OWDB oil-water heat exchanger with double tubes,
horizontal type
Type OWDC oil-water heat exchanger with double tubes,
vertical standing type
EXAMPLE for designation:
oil-water heat exchangers with double tubes, vertical standing type (OWDC),
rated capacity 250 kW (250), top oil temperature rise 43 K (43), form D,
Heat exchanger EN 50216-9–OWDC–250/43–D
5.2 Rating plate information

The rating plate must have the following information and has to be attached clearly readable on the

assembled heat exchangers:
- sign or name of supplier;
- designation according to EN 50216-9, 5.1;
- serial number;
- manufacturing year.
Deviations in the temperature must be agreed between manufacturer and purchaser.
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SIST EN 50216-9:2009
EN 50216-9:2009 – 8 –
Rated values:
- rated capacity in kW;
- rated oil- and water-flow quantity in m³/h;
- min./max. operating water flow quantity in m³/h;
- inlet and outlet temperatures oil-side and water-side in °C;
- pressure drop in the heat exchanger oil side/water side in bar;
- max. pressure in service for oil-side in kPa;
- max. pressure in service for water-side in kPa;
- max. design temperature for oil-side in °C;
- min. ambient temperature (water-side completely empty) in °C;
- mass of heat exchanger without oil and water in kg;
- oil and water quantity for filling in dm³.
Rating plate material: corrosion resistant and acid proof
(other versions of the rating plate upon agreement)
6 Tests
6.1 Routine tests
6.1.1 Tightness tests
6.1.1.1 Tightness test oil side

The oil side of the oil-to-water heat exchanger has to be filled with transformer oil with the temperature of

(60 ± 5) °C and a pressure of 500 kPa. After deletion of the last leakage the test pressure must be

performed for a period of 6 h without any leakage (visual inspection).

The oil side of the oil-to-water heat exchanger may be submitted to the following alternative tightness tests

by agreement between manufacturer and purchaser:

- hydraulic test with transformer oil filled at ambient temperature and pressure of 500 kPa for 3 h;

- pneumatic test with compressed air under water at 500 kPa for 2 h.
For the above mentioned period no leakage (by visual inspection) has to
...

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