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The company has high-qualified managers and specialists. All of them took part in construction of Maritza East 3 TPP and reconstruction of Maritza East 2 TPP and carrying out of repair activities. They are not numerous but quite well experienced and under constant improvement. Some of them are engineers, and the rest graduated technical high schools:

• Eng. Petko Antonov Petkov – birth date – 08.06.1949. Holder of a university degree – subject Thermal power engineering. Certificate AM No. 007048. He worked as a mechanic of Boiler department at Maritza East 3 TPP, head of Boiler department at Maritza East 3 TPP, vice Director for repair activities at Maritza East 3 TPP. At present he is Manager of Petko Petkov – 24 Ltd. He has 40 years working experience in Maritza East complex.

• Eng. Dimitar Kostadinov Kichukov – birth date – 24.01.1952. Holder of a university degree – subject Thermal power engineering. Certificate ОЯ No. 010476. He worked as a mechanic of Boiler department at Maritza East 3 TPP, head of Boiler department at Energoremont- Galabovo JSC, vice Director of Energoremont area Maritza East 2 TPP and Maritza East 3 TPP, Manager of Reotid Ltd., Plovdiv. He has 36 years working experience.

• Dipl. eng. Ivan Nikolaev Ivanov – Environmental health and safety inspector. Birth date 13.11.1985. Education and training – Gabrovo Technical University, subject – Hydro and pneumatic equipment, Master degree Work experience – Hraninvest – Hranmashcomplect AD, Stara Zagora, Manufacturing of machines and equipment for Food processing industry – Engineer-designer AES Maritza East I Services ЕООD, Galabovo, Power Industry, Mechanical fitter; Petko Petkov – 24 Ltd., Radnevo, Repair of power equipment – fifth qualification group.

• Dipl. eng. Svetlomir Pekov Koychev – designer. Born on 20.12.1968. Education and training: Angel Kanchev University of Ruse – mechanical engineer. Work experience: Patstroy EOOD – engineer designer; Technomash engineering, Sliven – mechanical engineer; since 02.2013 - Petko Petkov – 24 Ltd., Radnevo – fifth qualification group.

• Dipl. eng. Georgе Petev Georgiev – mechanical engineer. Born on 23.11.1987. Education – Gabrovo Technical University, subject - Hydro and pneumatic equipment; Certificate No 129 for EHS.

• Lachezar Petkov Antonov – deputy site manager. Born on 05.11.1982. Education and training – Highschool of Civil Engineering, Architecture and Geodesy – Stara Zagora – building technician. Professional experience: Petko Petkov – 24 Ltd., Radnevo. Dates: 2005 – 2013. Holder of fifth qualification group.

• Nikolay Dimitrov Nikolov – EHS inspector. Birth date – 05.03.1987. Education and training: University of Varna, subject – National security protection. Certificate No 94 for EHS training.

• Dimitar Milkov Dimitrov – site manager. Born on 16.11.1955. Education – high school – metal cold treatment. Certificate № 011245. Work experience: 35 years – fifth qualification group.

• Toncho Yordanov Petrov – foreman. Born on 06.11.1965. High school education. Work experience: Industrial energetics – fitter, Power engineering ООD – fitter, N. Radulov – Iveta , Stara Zagora – fitter; Petko Petkov – 24 Ltd., Radnevo since 2003. Holder of fifth qualification group.

• Stefan Petrov Rusinov – foreman. Born on 12.03.1970. High school education. Work experience: Power engineering ООD – fitter, N. Radulov – Iveta , Stara Zagora – fitter; Petko Petkov – 24 Ltd., Radnevo since 2004. Holder of fifth qualification group.

George Neykov Ivanov – foreman. Birth date – 06.05.1952. High school education - subject Mine electromechanics. Certificate M No. 012254. Working experience – 38 years. Holder of fourth qualification group.

Dimo Valkov Dimov – foreman. Birth date – 12.07.1964. High school education – subject - machine and equipment fitter. Certificate No. 052586. Working experience – 25 years. Holder of fourth qualification group.

•Svetoslava Hristova Gencheva – ecology and environmental safety specialist. Born on 05.09.1972. Education and training – Tracian University, subject – ecology and environmental safety.

The company has very highly skilled welders and truly experts at their trade with years of experience in different type of projects. All of them are certified with BDS EN 237. In the interest of safety and quality they are trained and tested on site. Testing procedures are based on the standards and codes set by industry associations.

Welders’ names, type of process and material, as well as welding scope are shown in the following table.

Petko Petkov – 24 Ltd. has a certificate № 01202 ХY/А 10 3319 of DIN EN ISO 3834-3 for adopted system for quality management in welding activities.

The company also has activities according welding procedures described here.

Our welders are well-experienced during pipelines welding of below listed materials:

Pos.

Material

Material standard

Material group

Classification standard

1

St 20

ГОСТ8731-84

1.1

ISO/CR15608

2

S 235; 15Mo3; 16Mo3

EN 10216-2

1.1

ISO/CR15608

3

A 106B

ASTM

1.1

ISO/CR15608

4

15NiCuMoNb5-6-4

EN 10216-2

4.2

ISO/CR15608

5

13CrMo4.5

EN 10216-2

5.1

ISO/CR15608

6

10CrMo 9-10

EN 10216-2

5.2

ISO/CR15608

7

A335 Grade P22

ASTM

5.2

ISO/CR15608

8

12X1MФ

ГОСТ8731-84

6.2

ISO/CR15608

9

X10CrMoVNb 9-1

EN 10216-2

6.4

ISO/CR15608

10

A335 Grade P91

ASTM

6.4

ISO/CR15608

11

A335 Grade P91/A312 TP316L

ASTM

6.4/8.1

ISO/CR15608

12

A312 TP316L

ASTM

8.1

ISO/CR15608

Welding was one of our main activities during ENEL Maritza East 3 TPP refurbishment, Maritza East 2 TPP reconstruction and repair, as well as AES 3C Maritza East 1 construction. The company was highly evaluated for welding high pressure pipes of various types of alloy steels. It is well seen in the references we have received by major international companies as ENEL and ALSTOM.
Excellent welders’ skills are proved during our activities on sites listed in p. 1, section II. Technical capabilities: the most significant of them are:

ENEL Maritza East 3 Refurbishment
- Replacement of heating surfaces;
- Replacement of Combustion chamber;
- Erection of Auxiliary steam pipeline.

Maritza East 2 TPP Reconstruction and repair
- Replacement of heating surfaces;
- Prefabrication, repair and replacement of heating surfaces, pipelines and fittings.

АЕS-3СMaritza East 1Construction with main contractor ALSTOM Bulgaria
- Installation of support and hanger system of high pressure pipelines of Unit 1 and Unit 2;
- Installation, welding, heat treatment and NDT of pipelines Main steam, Cold Reheat, Hot Reheat, Low pressure By-pass and Feed Water;
- Replacement of 10 pcs. of valves on Unit 1 and 10 pcs. of valves on Unit 2 – welding, heat treatment and NDT;
- Unit 2: Feed water system, drain lines – LBA, LBC, LBB, MAN, LAB – welding and pressure tests;
- Welding of instrumentation point connections on Unit 2 - pipelines LАВ and LBC.

Construction and installation works
- The company has been registered in the Bulgarian Construction Chamber through the central professional register of builders for construction works in the following areas:
- Certificate № I-009080 First group – high buildings construction, its relevant infrastructure, electronic communication nets and equipment – construction sites of third to fifth category.
- Certificate № II-002051 Second group – construction of transport infrastructure – construction sites of forth category.
- Certificate № III-002227 Third group – construction of power infrastructure – construction sites of third category.
- Certificate № IV-004420 Forth group – construction of public utilities infrastructure, hydrotechnical construction, environment preservation – construction sites of third category.
-Certificate № V-005952 Fifth group – particular types of construction and installation works, according to the national classification of economy activities, position 45 Construction with digital codes 45.11; 45.12; 45.21; 45.22; 45.23; 45.24; 45.25; 45.31; 45.32; 45.33; 45.34; 45.41; 45.42; 45.43; 45.44; 45.45; 45.50.