Leeds Building Services - Install and Commission Bespoke Flue Systems

Lot awarding rule: Submissions will then be evaluated on price only. The tenderer(s) submitting the lowest total price submission based on the most cost-effective approach will be the successful tenderer.

• Condition of participation

  A core directive of Gas Safe Technical Bulletin 163 is that any bespoke or specialist flue system designed to operate under positive pressure conditions (such as commercial CHP units, data centre generator exhausts, and modern condensing boiler cascades) must undergo a physical pressure test prior to commissioning to verify the physical integrity of the joints and ensure leakage stays within acceptable limits.

  Provide a design compliant with BS EN 13384.

  Commission system to BS EN 15287. To include a positive pressure test where the flue is P1 pressure or above. (This will be the case in the majority of projects). Leakage rates to be less than the maximum permissible listed in IGE UP/10. Provide pressure test result certificate.

  Supply and fit flue notice plate, including the designation of flue as described by BS EN 1443.

  Construction & Materials: Flue materials must safely resist temperature, pressure, mechanical stress, and corrosion. Separate flues must be run for incompatible fuels. Twin Wall insulated flue pipework

  Condensation Management: Condensing flue components must be corrosion-resistant and positive-pressure sealed. They require a minimum 22mm drainage pipe and a continuous upward slope toward the terminal of at least 2.5°.