The following are examples of projects that Saith has undertaken recently

WGEP

The Wilton to Grangemouth Ethylene Pipeline (WGEP) is a jointly owned asset between BP and Huntsman which is operated by Huntsman. After carrying out a risk based inspection (RBI) Huntsman concluded that online inspection using pigging inspection vehicles was required to provide assurance on the condition of the pipeline and that the integrity strategy is successful.

Huntsman appointed us to provide engineering services for the project that included;

• Assist in the evaluation of online inspection proposals and carry out overall project risk assessment
• Detailed design of the temporary pigging pipe work at a number of stations along the 250km pipeline
• Provide land agency services including agreeing compensation with effected land owners
• Providing technical support during pigging operations
• Provide and online acoustic pig tracking service

The work was carried out in 2005/6

TPEP

The Trans-Penine Ethylene Pipeline (TPEP) is owned and operated by Huntsman Petrochemicals UK Ltd. After carrying out a risk based inspection (RBI) Huntsman concluded that online inspection using pigging inspection vehicles was required to provide assurance on the condition of the pipeline and that the integrity strategy is successful.

Huntsman appointed us to provide engineering services for the project that included:

• Assist in the evaluation of online inspection proposals and carry out overall project risk assessment
• Detailed design of the temporary pigging pipe work at a number of stations along the pipeline
• Provide land agency services including agreeing compensation with effected land owners
• Providing technical support during pigging operations
• Act as the Engineer for all of the main contracts including the construction and inspection works providing resident engineers, quality inspection and contract administration

The work was carried out in 2003

HARDWICK AGI

Scotia Gas Networks (SGN) has awarded Saith Limited the contract to carry out all detailed design associated with the rebuild of Hardwick AGI. This site is one of the major supplies into the Southern Network and is critical to the operation of the entire gas network in the South of England. The project is phased over 3 years and involves modifications to the existing national transmission (NTS) off take regulator system which will supply a new pipeline between Hardwick and Marsh Gibbon.

FROYLE

Transco identified a need to increase the capacity of Froyle PRI to reinforce the downstream intermediate pressure (IP) network. The new installation has been designed to IGE/TD13 and is located on the existing Froyle PRI site. The PRI was upgraded from three existing regulator streams into four streams, each being fitted with flow limit and stream selection facilities. An existing twin stream and single stream Lineguard cabinet was reused and a further single stream cabinet added. The existing regulator streams were replaced as part of the project. The existing regulator inlet manifold was retained, whereas a new outlet manifold was designed. A new filter bank consisting of three filters was installed providing filtration common to all regulator streams. A facility for future preheat was included in the design.

BELLE HATCH

Transco identified a need to increase the capacity of Henley Belle Hatch PRI to reinforce the downstream medium pressure (MP) network.

The new installation was designed to IGE/TD13, and was located on the existing Henley Belle Hatch PRI site. The new PRI required preheat, and has a remote monitoring facility, which entailed two additional housings for the preheat boiler package unit, and the instrumentation/telemetry control room. The housings had to be sited to suit hazardous areas, and requirements for maintenance access. Additional capacity was achieved by addition of a new third regulator stream to supplement the existing two regulator streams. Flow limit was installed on the existing two streams only, since the new third stream operates in standby mode only. A control system was installed to maintain constant outlet pressure, regardless of the number of working streams. Existing heat exchangers were removed from the existing two streams, and installed with revalidated filters from stock, as a common bank for all three streams. The new pressure reduction single stream module was supplied as a prefabricated unit.

GM5

GM5 pipeline was affected by proposed new landfill works which were due to commence during late summer 2004.

The work involved construction of a new landfill “cell”, part of the existing Shelford Farm landfill site, near Canterbury, Kent. GM5 runs throughout these works.

The proposed diversion route lay to the north of the existing and passed through two areas of note:

• Through a newly built slope.
• Through a utility corridor, 40 to 50metres in width, with overhead high voltage cables on either side of the pipeline of 133Kv and 432kv

The pipeline operates at a MOP of 38barg with the design pressure being 69barg. It is made of 457mm outside diameter with a wall thickness of 9.52mm in APILX52 material.

The design team had liaised with the Waste Management Consultants, Network Management & Network Construction.

The following design disciplines were covered:

• Mechanical Engineering
• Cathodic Protection
• Civil and Structural Engineering
• Technical Safety Engineering