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Concept and Feasibility

A workable scheme agreed before design starts.

Concept and feasibility for station systems: the requirement defined, the existing station assessed and the options tested before survey and design.

Requirements defined, existing systems assessed and options tested for feasibility.

Concept and Feasibility

Requirement

The requirement, set out before the design

Before a station system scheme reaches survey and design, the operational need, the systems already in place and the ways of meeting the need have to be set out and tested.

TDM confirms the operational need with the client, captures the system requirements and reviews the asset, station and system records that already exist. Assumptions, constraints and missing information are recorded, with the investigations needed to close each gap.

The requirement, set outTDM confirms the operational need, captures the system requirements and reviews the existing records, then records the requirements, the assumptions and constraints, and the investigations still needed.GatheredConfirmedRecordedOperational needSystem requirementsExisting recordsRequirementConfirmed with the clientRequirements scheduleAssumptions, constraintsInvestigations neededOperational needSystem requirementsExisting recordsRequirementConfirmed with the clientRequirements scheduleAssumptions, constraintsInvestigations needed

Existing station

The systems the scheme has to work with

TDM reviews the CCTV, customer information, Public Address, Help Point, network and telecoms equipment in place and the interfaces a new system has to keep. Power, connectivity, containment and equipment space are checked, with access, operational, heritage and accessibility constraints.

Options

Options tested for feasibility

For each option TDM sets out an outline system architecture, indicative equipment quantities and locations, and the migration from the existing systems. Each is tested for technical and operational feasibility, buildability, risk and the consents it would need, and TDM recommends a preferred option.

Each option, tested for feasibilityFor each option TDM sets out an outline system architecture, equipment quantities and locations and the migration from the existing systems, tests it for technical and operational feasibility, buildability, risk and consents, and recommends a preferred option.Each option sets outTested forOutcomeOutline architectureEquipment and locationsMigration from existingFeasibilityBuildability, risk and consentsPreferred optionRecommended by TDMOutline architectureEquipment and locationsMigration from existingFeasibilityBuildability, risk and consentsPreferred optionRecommended by TDM

Into design

A brief for survey and design

The outcome is an outline scope, a brief for the surveys and investigations still needed, a budget estimate and an initial programme, ready for reference design for Approval in Principle (GRIP 4 / ES4).

Survey and Design
Concept and feasibility, into survey and designTDM sets out the requirement and assesses the existing systems, develops options and tests them for feasibility, then hands a design brief of scope, surveys, budget and programme into survey and reference design.Set outTestedInto designRequirementNeed, records and gapsExisting systemsInterfaces, power and spaceOptionsArchitecture and migrationFeasibilityBuildability, risk and consentsDesign briefScope, surveys, budget, programmeSurvey and designReference design, GRIP 4 / ES4RequirementNeed, records and gapsExisting systemsInterfaces, power and spaceOptionsArchitecture and migrationFeasibilityBuildability, risk and consentsDesign briefScope, surveys, budget, programmeSurvey and designReference design, GRIP 4 / ES4

Scope

From the requirement to a design brief

  • Requirements schedule
  • Existing-system assessment
  • Options appraisal with a recommended option
  • Outline system architecture
  • Indicative equipment schedule and layouts
  • Interface and migration outline
  • Risk, assumption and constraint register
  • Consents and approvals schedule
  • Survey and investigation brief
  • Budget estimate and initial programme

Discuss concept and feasibility for a site.

Something else

If the work does not fit one of these routes, send a short general enquiry.

General enquiry