Technical support for Flexicoker Unit (U-32) restoration

Client:

HELLENIC PETROLEUM - ELEFSIS INDUSTRIAL COMPLEX

Status:

Completed

Country:

Greece

Business Area:

Oil

Solution/Service:

Studies

Completion Year:

2017

Category:

Refineries

Technical Data

Most pump circuits in the Fractionation & Light Ends systems of the Flexicoker Unit U-32 operate with two pumps in parallel (mainly and spare). In cases of repair, modification of the operating conditions of the Unit is required, a fact that leads either to the failure of achieving products within the required standards or to the reduction (directly or indirectly) of the supply flow of the unit. To avoid the above, the following modifications were made in the existing circuits:
- 32-P-009 A / B, 32-P-013 A / B, 32-P-014 A / B, 32-P-016 A / B, 32-P-020 A / B and 32-P- 024 A / B installation of 3rd pump,
- 32-P-001 A / B motor replacement with larger,
- 32-P-008 A / B, 32-P-023 A / B and 32-P-027 A / B replacement of the impellers.
The preliminary check of the Pressure Safety Valves in VDU (U-31), Hydrocracker Unit U-34 (LP SECTION) & U-32 (LIGHT ENDS SECTION) includes the following:
1) Set the security upper limit namely x% selected / calculated area.
2) List of all selected PSVs per unit in a list. The list should contain the contingency of the design as well as the governing contingency. The PSVs that are proposed to be checked for the increased capacity should be also indicated.
3) Preparation of a process report.
4) Determination based on criteria whether involvement of the Licensor ιs required and under what conditions.
PSVs that are not affected by the increase in capacity are excluded from the preliminary check e.g. firefighting network.

The project included the following sub-projects:

Detailed Engineering of Hydraulic upgrade of Unit U-32 Flexicoker pump circuit
Preliminary check of Pressure Safety Valves in VDU (U-31), Hydrocracker Unit U-34 (LP SECTION) & U-32 (LIGHT ENDS SECTION)