Highly complex design and installation of pre-insulated district heating, cooling pipes and two heat sub stations crossing new residential and commercial buildings, forming part of the prestigious Eon CitiGen network in Central London.
This installation was a reinstatement of a pipe previously diverted by other contractors to permit the construction of the new building.
Due to the project complexity and technical constraints of the site, Eneteq Services Ltd were the only contractor prepared to commit to design and installation work in the required timeframe. The pre-insulated pipes were to be installed into a new pre-cast concrete culvert crossing the basement with deep highways connections at either end. Both connections were more than 5m deep in live trafficked roads with access only possible by using the adjacent tower crane managed by the main site principle contractor. Heat sub stations were designed to be factory manufactured and de-assembled to permit access to the plant rooms.
Capability of Design
The pre-insulated pipes were to be installed into a new pre-cast concrete culvert crossing the basement with deep highways connections at either end. Both connections were more than 5m deep in live trafficked roads with access only possible by using the adjacent tower crane managed by the main site Principal Contractor, Brookfield Multiplex (PC).
Having been provided with only an indicative line diagram by the customer, Eneteq developed the complex routing and alignment of the pre-insulated pipe, incorporating this with the main Contractor BIM Modelling. Eneteq also designed the heating substations on a bespoke basis to permit complicated on-site installation with minimum breaking down of the substations on site. The extreme constraints of the pipe alignment caused a substantial number of pipe jackets and outer casings to be bespoke and necessitated on-site manufacture.
Daily meetings ensured key stakeholder engagement and included coordinating design works, site access, materials, other contractors and interested third parties.
As connections were excavated, Eneteq also held daily briefings with the client-appointed designers to coordinate the changing requirements and provided technical support regarding material capability, expansion, heat loss and physical accommodation of the components.
Project complexity, mainly due to space constraints with the excavations resulted in a compromise solution of pre-insulated and standard pipe fittings which then needed to be insulated with bespoke outer casings cut and fabricated onsite once the steel welding works were complete. The continuous design evolution required a technically capable team able to detail, amend and reinvent solutions. Eneteq also designed, developed and fabricated bespoke lifting equipment to resolve non-penetrating lifting requirement within the culvert.
The central London site had many constraints; the excavations at each end of the culvert were 5m deep in a main thoroughfare and required confined space working methods and specially trained operatives which Eneteq were able to provide.
Eneteq employed its comprehensive quality processes for jointing and welding. All joints are photographed 10 times throughout installation and these photographs form part of the handover documentation along with GPS coordinated joints, air, hydraulic, weld and joint installation records.
Commercial risk management
With a continually evolving design, robust commercial management procedures were essential. Eneteq worked in partnership with the client to maintain an awareness of all developing commercial issue and by operating with an open book costing policy. This transparency led to an efficient final account agreement.
Supply chain management and logistics
Eneteq’s procurement specialists have 20 years+ experience in managing complex supply chains. We have preferred supply partners and operate a strict pre-qualification system for all new suppliers which adheres to our robust quality standards. Our logistics specialists successfully coordinated all deliveries with the main contractor. Due to site constraints, all material had to be pre-slung for delivery by tower crane and arrive within a 30-minute time slot with all necessary safety and quality information.