Construction Supervision services for the interconnection between TAP and National Natural Gas Transmission System (NNGTS) at the area of Nea Messimvria-Thessaloniki
Construction Supervision services for the interconnection between TAP and National Natural Gas Transmission System (NNGTS) at the area of Nea Messimvria-Thessaloniki
Client:
DESFA S.A. (HELLENIC GAS TRANSMISSION SYSTEM OPERATOR S.A.)
Business Area:
Natural Gas
Solution/Service:
Project Management Services
Category:
Metering & Regulation Stations
Technical Data
The Pipeline System has the following major design parameters:
- Design Code: EN 1594 “Gas supply systems — Pipelines for maximum operating pressure over 16 bar — Functional Requirements, supplemented by national or company standards, where required.
- Pipeline Outside Diameter (mm): DN600 (24")
- Steel Grade: EN ISO 3183 Grade L450ME
- Design Pressure: 95 barg
The LVS (U-6930) includes the following:
- A manual ball block valve, with by-pass
- Pressure indicators at the both sides of the valve. (No transmitters are foreseen)
- A vent line and a vent stack
- The LVS shall be fenced, power, lighting, earthing and lightning protection systems shall be foreseen for the fenced area; no buildings are foreseen inside the fenced area.
The M/R station has the following major design parameters:
- Annual Capacity: 3bNcmy
- Hourly rate: 417,000 Nm3/h
- Main Design Codes: EN 1776 ‘Gas Supply — Natural Gas Measuring Stations — Functional Requirements’ and EN 12186 ‘Gas Supply Systems — Gas Pressure Regulating Stations for Transmission and Distribution — Functional Requirements’
Our Services
- Construction Supervision
- Project Management Services
Description
The project concerns the construction of a new Metering and Regulating Station (M/R) at Nea Messimvria, for the realization of the connection between the TAP system and the NGTS system. A line valve station (LVS) shall be also installed at the tie—in point with TAP. The M/R station will have the capability to filter, measure and let down the gas received from the TAP system in order to supply the required amount of gas into the downstream NGTS system and vice — versa.
The term “pipeline" means the underground part of the interconnecting pipeline, for which:
- the northern end is the tie—in point with TAP (at GTP-01 station) and
- the southern end is at the fence of the M/R Station (U—6910) northern side
ASPROFOS as the SUPERVISING ENGINEER executes SUPERVISING ENGINEER’s duties listed below but not necessarily limited to. Throughout and in addition above mentioned duties, the SUPERVISING ENGINEER exercises all the activities that may be required by the Law.
- Review and agree the EPC Contractor’s breakdowns of the Works. These breakdowns are used for the Contractor’s quality plans, for progress reporting and for recording completed elements of the Works.
- Review the technical adequacy of the Contractor’s plans, procedures and method statements. Check that the scope of the Works is covered and that the requirements of the Technical Volume are incorporated. Check that the Contractor‘s proposed list of (future) plans and procedures is adequate.
- Check the adequacy of the plans, procedures and method statements and their implementation on a daily basis. Produce supervision plans and reporting to match Contractor’s activities.
Provide technical support to the DESFA concerning Authorities and other third parties.
- Planning, organization and administration of Supervision Team.
- Participate in all necessary site meetings, progress review meetings, etc. organized and conducted by DESFA.
- Check and sign the site log.
- Full support to the DESFA if requested, for the following CLIENT’ duties under the EPC CONTRACT:
- Approval of Personnel Appointments
- Approving and issuing variations
- Agreeing payment at completion
- Agreeing time for Clearance of the Site
- Agreeing Timing of Tests
- Acknowledgement of Force Majeure
- Approval of Sub—Contractors
- Approval of Quality Plan and Manual Auditing
- Consenting to Time Schedule & requesting Time Schedule Revision
- Consenting to Removal of Equipment
- Coordination of Deliveries of Client Supplied Materials
- Coordinating co—operation with any Others on the Site
- Consenting to work outside normal hours
- CONTRACT Interpretations
- Drawings & Specifications issues
- Requests for Samples & Tests
