Wormington to Sapperton Pipeline
Laing O’Rourke have been appointed by National Grid as the design engineers, for stage 1, for the proposed 900mm diameter high pressure gas feeder pipeline which will run from an existing facility at Wormington to another existing facility at Sapperton Approximately 44km.
QEMS are providing the Design Management role for both the two AGI’s and Pipeline:
· Process Design
Process engineering deliverables include ELDs, and calculations for the gas velocity, pressure drop and hazardous areas.
Formal HAZID, HAZOP and outline HAZCON studies were conducted, which will feed into the project risk register.
Specifications and data sheets produced in conjunction with process engineering, I&C engineering and cathodic protection.
A pipework specification was developed, identifying piping materials, grades and thicknesses which meet the project-specific process conditions. Thisl included pipe wall thickness calculations, test pressure calculations, and the specification of major in-line piping components and equipment such as valves, pig traps, flanges, tees, bends, reducers, and other pipe fittings. Consideration will be given to vents, drains, access connections and bridle systems consistent with good practice and process requirements.
The requirements of T/SP/P/18 were considered, as appropriate, at tie-in locations, and wherever it is necessary to expose an existing gas pipeline.
The new pipework layout was Stress analysed in according to IGE/TD/12, and the design will be modified as required to ensure loading is within the code requirements.
ELDs and General Arrangements were developed into a Material Take-Off (MTO), and all items with a delivery lead time which could impact on the project construction schedule will be identified, specific, requisitioned and ordered.
Requirements for corrosion protection, including coatings and cathodic protection, were included within this part of the Design.
Detailed design comprise of the effects of ground conditions on the design and build, define the design and construction requirements and mitigation measures in those areas of the pipeline route which are subject to subsidence, landslip, and other unusual ground conditions. Designs for valve bases, pipe support bases and bases for underground components.
The Mechanical Design Section will provide information as required. This will cover layout, sizes, loadings, etc.
Deliverables included piling/foundation design for pig launchers/receivers, instrumentation kiosks and pipework, layouts of roads to ensure access by appropriate vehicles and construction specifications
o Electrical, Control & Instrumentation
The detailed design will consider all of the electrical power, system control, instrumentation and telecommunication (E,C&I) requirements.
PIPELINE
The pipeline design will include the following main items as a minimum:
· Pipeline route assessment including Heavy wall schedule and TD1 survey.
· Procure all of the long lead items.
· Engage a specialist in the identification and feedback of any two areas of subsidence, landslip or other relevant features, for consideration of provision of special structural sections.
· Create and continually update Proximity Route Maps (1:10,000) to establish proximity pipe requirements from data collected through surveying work.
· Design for the special crossing drawings; covering Road, Rail, Rivers and third parties
· Liaison, supervision and management of Specialist Subcontractors engaged on pre-construction surveys.
General duties included managing the CDM Risk Register and managing the design budget and resources.