D10 Technical Specification WELDING (1)

1January 2008

Technical specifications

for welding (D10)

1January 2008

MINUTES OF THE 2ND PURCHASER GROUP MEETING OF TREESPA PROJECT HELD AT PEACOCK HOTEL

24TH JANUARY 2008-WELDING MACHINE Small Industrial Development Organization (SIDO) in collaboration with Tanzania Electric Supply Company Limited (TANESCO) organised a three days, 2nd Purchaser Group (PG2) meeting which was held at Peacock Hotel on 23rd, 24th and 25th January, 2008. PG2-meeting for welding machine was held on 24th January, 2008.

1. Agenda. 1. Registration 2. Self Introduction 3. Opening of the meeting 4. Project Introduction 5. Aim of the meeting and reason for selecting the product 6. Performance of Welding Machines 7. Setting specification of the Welding Machines 8. Market of the products 9. Time schedule 10. Dissemination of results 11. Commitment and discussion 12. Work to be done for the next meeting 13. Others, financing options etc 14. Next meeting 15. Closing the meeting

2. Attendance S.NO. NAME COMPANY/

ORGANIZATION E-MAIL TELEPHONE

1. FLORENCE GWANG’OMBE

TANESCO [email protected] 0754-875278

2. KAKWIRA RAPHAEL

SIDO [email protected] 0754-327584

3. BENEDICT V. LYARUU


4. LARS-AKE CROHOLM

A-CONSULT AB [email protected] +46 105051413

5. ENG.THOMAS MNUNGULI

TBS [email protected] 0754 – 464 480

6. MUHSIN A. KHATRI

LEHMANN’S (T) LTD

[email protected] 0713-242220

7. STEPHANO Y. LEYAN

SIDO [email protected] 0754-093932

8. BONAVENTURE B. SAANANE

DIT [email protected] 0787-489490

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9. SABINA P. M. DAATI


10. GEOFFREY N. MACKANJA

CTI [email protected] 0784-423197

11. ROBERT NINDIE

TIRDO [email protected] 022-2666034 0732-928183

12. MATHIAS ALEXANDER

TIRDO [email protected] 022-2666034 0713-765481

13. LUGANO WILSON

TIRDO [email protected] 0786-771056

14. MAGDALENE MKOCHA

TCCIA [email protected] 0754-402686 022-2119436

15. OMARI A. KOMBA

MMWCI - 0754-686249 0773-686249

16. KALUMUNA P. B. R.

SIDO-DSM [email protected] 0754-986687

17. ZAINABU YUSSUFU

SIDO 0754-835289

18. YELA ENOCK MITM FAR & WELDING

0784-401614

19. PETER CHISAWILLO

INTERMECH ENG. LTD.

[email protected] 0713-771182,2119436/2128136

20. MARY MASHURANO

SIDO 0754-696088

21. NINA H.

MCHIMBI

SIDO [email protected] 0754 – 778 360

Apologies S.NO. NAME COMPANY/


1. KIHEDU JOSEPH UDSM, CoET [email protected] 0754 – 835 648

Absent S.NO. NAME COMPANY/


1. MR.OMAR BAHDELLA BAHDELA CO.LTD [email protected] +255 784 700200

3. Opening AF representative chaired the meeting. It was opened at 9:30hrs by the Chairman who thanked the participants for responding to the invitation and welcomed everyone to participate fully in the discussions.

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4. Project Introduction Introduction to TREESPA was presented by SIDO representative, that Tanzanian Renewable Energy and energy Efficiency project to Sustain Poverty Alleviation (TreeSpa) aims to facilitate that investments in rural energy infrastructure help enhance living conditions for the poor as much as possible. The focus is to develop the rural wealth creating sectors in Tanzania through identifying and specifying their top priority appropriate energy needs. The project activities include three components:

� Designing aggregated purchasing schemes for energy efficient electrical equipment.

� Designing electricity service agreements � Business development support (to business using energy)

Three products earmarked for the pilot implementation of the TreeSpa project are:

� Electric motors for operating different machines such as milling machines, water pump etc.

� Electric welding machines which are considered as means to support the establishment of small rural based metal fabrication industries which are vital to rural production and security

� Electric lighting for rural enterprises, households, hospitals, schools etc. SIDO and TANESCO are the foremost actors to TREESPA in the project. They will cooperate to develop attractive modern energy services for rural productive sectors. The two European partners AF Process AB-Sweden, the Coordinator and Danish Management A/S (DEM)-Denmark, have a long and adequate project experience in rural electrification, training and capacity building, energy efficient equipment and technology purchasing schemes

5. Aim of Meeting Aim of the meeting was to discuss, work together and come up with technical specifications, market potential and potential bidders for energy efficient welding machines This product was chosen because it is considered as a cross-cutting product which supports the establishment of small rural based metal fabrication industries/workshops which are vital to rural production and income generating activities.

6. Performance of Welding Machines Resistance welding makes use of the heating effect which occurs when an electric current flows through a resistance. Electrodes are used to squeeze together components to be

4January 2008

welded. The electrical resistance is greatest where the components are in contact. If a high current at low voltage is passed between the electrodes and through the plates, heat is evolved at the interface. Localised melting takes place and a weld is produced. Pressure on the work-piece is maintained after the current is switched off until cooling allows re-solidification.

7. Welding Machine Specification The following Table shows the General Technical Requirements for Energy Efficiency Welding machines. No. Requirement Mandatory Desirable

1 Input voltage 230V Single phase;400V three phase x 2 No of phases - one

No of phases - three

x x

3 Frequency 50Hz

x

4 Continous rating x 5 Duty cycle 35%

Duty cycle 60, 100%

x x

6 Open circuit voltage 35 V Open circuit voltage up to 55 V

x x

7 Operating arc-voltage not more than 30 V x 8 Welding current range: 150-240 A x 9 Switch–fuse recommended 80/100 A x 10 Minimum power factor 0.65 x 11 Capacitor bank correlated to pf 0.65 x 12 Type of cooling:

air cooled and according to IEC standards; fan cooled and according to IEC standards

x

x

13 Class of Insulation B Class of Insulation F

x x

14 Degree of protection: IP21 for indoor & IP23 for outdoor Above IP21 & IP23

x

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x 15 Protection Class 1

Protection Class 2

x x

16 Pollution Degree: Not below pollution degree 3 Pollution Degree 1

x x

17 Ambient Temperature: 40degC x 18 Relative Humidity:

not above 87% x

19

Insulation resistance: Not less than 5 Mega ohms

x

20 Components and accessories according to IEC standards

x

21 EMC compatibility according to IEC stds x 22 Energy efficiency label on the name plate x 23 Altitude: Not more than 1000m ABSL X 24 Mechanical mounting and noise level to comply with

IEC stds x

ITEMS TO BE INCLUDED IN THE PACKAGE No. Requirement Mandatory Desirable 1 Welding cable min 10m x 2 Power supply cable min 10m x 3 Electrode holder: IEC stds max 400 A x 4 Ground clamps (the quality of spring in the holder

should be the same as that of the electrode holder as per IEC stds)

x

5 Cleaning equipment x 6 Safety gadgets (helmets, goggles, gloves, screen)

according to BS OSHA x

7 Operation, Service and Maintenance manual in English x 8 Circuit diagram to be included on the machine and in

manual x

9 Warranty period min twelve months x 10 Local Dealer x 11 Easy in maintenance x 12 Critical spares (terminals, capacitors) x

6January 2008

8. Market of the Product Machines rated 150 and 200 amperes—30 volts are for light-shielded metal-arc welding and for inert-gas arc welding. They are also for general-purpose jobs or shop-work. Machines rated 200,300, and 400 amperes—40 volts are for general welding purposes by machine or manual application. Machines rated 600 amperes—40 volts are for submerged-arc welding or carbon-arc cutting.

9. Time schedule

� Conduct purchaser group meetings � Draft Tender Documents � Hold pre-bidding meetings � Tender documents refinement � Float tenders � Evaluation and Testing of offered products

10. Dissemination of Results The project findings, material and results will be disseminated to other countries in Sub-Saharan Africa.

11. Commitment and Discussion The Purchaser group members are part of the process and support the Aggregated Procurement Scheme tendering process and the tender. The Purchaser group members are responsible for the tender document and specification of requirements. During the discussion,

� It was strongly agreed that there is a need to conduct a market survey to estimate how big is the market potential for Energy Efficiency Welding Machines and the information to be included in the tender document.

� According to Public Procurement Act of Tanzania, there should be a fair play ground for all bidders. Therefore the project is not allowed to send any tender document to potential bidders.

� The project coordinators should ensure the umbrella organisation i.e. TCCIA and CTI etc are conversant with the project so as to enable them advice on possible financing options.

� The source and amount of funds to be spent for purchase of this product have to be known and the information to be included in the tender document

� It was noted that the problem of arc work welding is that it pollutes environment

12. Work to be done for the next Meeting

7January 2008

It was agreed that before the next meeting, specifications for energy efficiency motors have to be refined and also survey for motors to estimate the market potential have to be conducted.

13. Other Financing Options It was agreed that during the market survey, it should also be investigated which financing institutions are operating in the areas earmarked for pilot TreeSpa project implementation.

14. Next Meeting It was agreed that this date will be communicated to the participants later.

15. Closing the meeting The meeting was closed by the chairman at 15:30 hrs.