France – Electricity, heating, solar and nuclear energy – Reliability improvement of Martigues and Blénod anti-icing heat exchangers

The purpose of the contract concerns the design studies of heat exchanger batteries (including studies to improve the initial design), workshop manufacturing, and on-site work. The exchanger has 16 batteries and its function is to preheat the air upstream of the Combustion Turbine compressor on the Blénod CCGT and on Unit 5 of the Martigues CCGT. The expected services are as follows: 1/ Design of a new heat exchanger: The Contractor must design a new heat exchanger according to CODAP or EN standards, incorporating design improvements to guarantee a lifespan of 25 years and 1,500 hours of annual operation, under normal operating conditions and site ambient conditions (the number of expected cycles will be given in the CCTP). These improvements must take into account the disorders encountered since commissioning, namely leaks related to stress corrosion cracking and crevice corrosion. The Contractor must take into account the potential root causes identified by the Company, as well as all those it will identify during its study. The new heat exchanger must adapt to existing interfaces on site. On-site measurement is strongly recommended. The CCTP will indicate information on air/steam flows, temperatures and humidities at which the heat exchanger must operate, the requested delta T, and the admissible pressure drop. 2/ Workshop manufacturing of heat exchange batteries and hydraulic testing, pickling and passivation - DESP conformity assessment according to module G: Delivery of 3.1 certificates and 100% surface NDT 3/ Transport to the site and storage 4/ Removal of old batteries - Installation of new batteries - Participation in leak tests carried out by the site before equipment restart - Performance of functional tests on achieving thermal performance: Removal of old batteries:  Installation of markers in exclusion zones,  Cutting and/or removal of elements and structures necessary for battery removal,  Disconnection of batteries and removal of support elements,  Crane setup and coordination with the maneuver chief,  Drafting and validation of lifting adequacy,  Lifting and lowering of batteries to the ground for cutting,  Evacuation of cut batteries to the site's waste disposal facility,  Site safety and impassable marking of dangerous areas. Installation of new batteries:  Transport of batteries from the storage area to the work site,  Crane setup and drafting then validation of lifting adequacy,  Crating of batteries and installation in the lower part,  Connections to existing (bolting with new mounting gaskets according to previously identified tightening torques),  Connection of batteries to each other (bolting),  Reinstallation of intermediate floors if necessary,  Installation of scaffolding for heat exchangers in the upper part,  Crating of batteries and installation in the upper part – connection of lines,  Connections to existing (bolting with new mounting gaskets according to previously identified tightening torques),  Connection of batteries to each other (bolting),  Reinstallation of existing elements and structures removed, if necessary welding and painting. It is possible to handle the old and new batteries either from the top of the heat exchanger by making cuts on the roof of the Combustion Turbine intake duct, or by removing the suction caps upstream of the heat exchanger. The batteries are bolted on site. Leak tests aim to validate bolted assemblies. Functional tests aim to validate the thermal exchange performance. We request a verification for at least 1 month, during the period when the heat exchanger is operating, i.e., rather in winter (therefore several months after on-site installation). Installation at Blénod will take place during the 2027 unit shutdown which occurs between May and September. As the next unit shutdowns at Martigues 5 are short shutdowns, the installation of the batteries will be as follows: 4 batteries in 2027, 4 in 2028, 4 in 2029 and 4 in 2030. The 2027 unit shutdown lasts 1 month, in April (only 3 ½ weeks available for the removal of old batteries and the installation of new ones).

Procedure

Negotiated with prior call for competition

Notice type

Contract notice (standard)

Contract nature

Supplies

Legal basis

32014L0025

Common Procurement Vocabulary (CPV)

09300000 — Electricity, heating, solar and nuclear energy

Published

05 March 2026 at 23:00