Mostostal Płock SA is one of the most experienced Polish companies operating in the mechanical industry. The company’s history goes back more than 50 years. Since 1998 it has been forming part of Mostostal Warszawa Capital Group. Main competences of Mostostal Płock are focused in the field of broadly defined oil&gas. Nevertheless, the company is also operating in chemical, energy and food industries. The basic tasks and services of the company feature: prefabrication and erection of storage tanks, prefabrication and assembly of industrial installations, prefabrication and assembly of pipelines, prefabrication and assembly of steel structures, prefabrication and erection of machines and reservoirs. Mostostal Płock owns equipment base that enables execution of service using heavy lifting method and a laboratory with accreditation of PCA. The company also holds all the necessary qualifications and certificates, e.g. certified management system according to ISO 9001, 14000, 18000. Company’s customer portfolio includes firms such as PKN Orlen SA, Lotos SA, PERN SA. Mostostal Płock S.A. was established as a result of the transformation of the ownership of Płockie Przedsiębiorstwo Konstrukcji Stalowych i Urządzeń Przemysłowych. The company has been operating in the construction and assembly industry for over 50 years and since 1998 it has been a member of the Mostostal Warszawa Capital Group. Mostostal Płock has been involved in very complex tasks related to the construction of industrial sites for a number of years, mainly for PKN ORLEN S.A.