It has been proven that a successful retrofit installation is often driven by a set of robust designs and methodology. Driven by a robust survey output and wide range of product solutions, the retrofit design process and Form B need to capture and deliver the full story behind the installation works. iLECSYS Rail’s design packs include a detailed method statement capturing the preparation, removal of Legacy equipment and install of Class II FSPs and transformers. This article will take a look at each element of the design and retrofit documentation process as well as how the supporting survey and product information links together. The key end goal is to provide a robust document, illustrating the new equipment and its user interface. G110 non-conceptual with correlation has been the chosen method in most cases for this retrofit program.
G110 Non-Conceptual Reds & Greens
One of the key drivers behind the upgrade of existing Legacy location cases is that the design work can be carried out under a G110 non-conceptual design package. This method allows for the modification of existing layouts or high resolution LOC prints. This method is also much more cost effective, as a full electrical design is not required. The G110 mark ups form part of the site specific Form B or Method statement. LOC prints and records handed back also contain a copy of the G110 Reds and Greens mark ups. Existing records can be retrieved through EB or by using LOC print images gathered from the survey report.
Form B and CRE Checking
A site specific Form B detailed design report is available, which outlines important details including preparation works and installation method. The Form B is based on survey output data sited on the Legacy Project Tracker.
The Form B outlines scheme details and best practices. Full existing site details and access points are then put together in a robust document. Form B’s are provided to the relevant departments and install teams, in advance of the installation. This allows teams to familiarise themselves with both the location and existing case layout. Equipment O&M manuals are also included for an in-depth insight to the product specifications and guidelines.
By including this level of detail it allows both the project management and installation team to have a clear insight and vision as to how the works will be carried out. It also eliminates any issues that may be faced during the install. The team can confidently then approach the install using the step-by-step install procedure.
The Form B also includes designers risk assessment, Guidance notices, IDC/IDR certificate and DRN comments. Prior to issue, Form B will be sent to the CRE and DPE for checking and signing.
Signalling and E&P CRE & IDC
This process will involve the completion of an Interdisciplinary Check (IDC) with both the signalling and E&P CRE, via telecom or video conference.
Driven from the G110 non conceptual design is the production of updated profile sheets and layout drawings for the existing case. The layout sheets are based on the exact layout instead of being driven by a generic layout design. Information will include: new switchgear and transformer equipment, recommended fuse ratings and amended equipment list, removing old redundant equipment and replacing with new part numbers and description.
The final element will include the full records hand-back to Network Rail and the Maintainer. Updated records will be passed back to EB for reissuing.