IWB On-Call 24/7 Welding Services for District Heating Network 2026 Tender

Original: IWB, Pikettdienst Schweissarbeiten Fernwärmenetz

IWB Industrielle Werke Basel

About this tender

IWB Industrielle Werke Basel is procuring on-demand welding and 24/7 on-call (Pikettdienst) services across its district heating distribution network in Basel. The work covers selective welding tasks and standby duty throughout the network, with the place of performance given as 4002 Basel, Switzerland. The contract runs from 31.12.2026 to 30.12.2028, a fixed two-year term. IWB also reserves the right to extend the contract three times by 12 months each, giving a possible total term of up to five years. The procedure is an open tender for construction work, published on simap.ch as notice #45764. Bids must be prepared on IWB's tender forms, including a price sheet (Annex A2), a supplier reference form (Annex A3) and a vehicle fleet declaration (Annex A4), all uploaded to the Decision Advisor tool. The tender is conducted in German, and the contract is to be performed in German. Consortia (simple partnerships under Art. 530 OR) and subcontractors are permitted, subject to IWB's prior approval for subcontractors. Variants and partial tenders are not permitted. Specific technical requirements include welding under ISO 9606-1, rolled pipework on district heating networks rated for 130°C/PN25 and 170°C/PN40, and work in shafts and channels. Questions must be submitted via the simap.ch question forum by 06.11.2026.

Bidder eligibility

EK 1 – Supplier references: The bidder (or each consortium member's reference, as applicable) must evidence two comparable completed reference projects in pipework construction on district heating networks, performed after 01.01.2021 (within the last five years). Reference 1 must be designed for 130°C flow temperature and PN25 (mandatory). Reference 2 must be designed for 170°C flow temperature and PN40 (mandatory). Each reference must have a scope of at least CHF 100,000 excl. VAT per client/project. References from subcontractors are not accepted. Evidence: complete Annex A3 (Reference Form Supplier) uploaded to Decision Advisor. EK 2 – Staff availability and qualifications: The bidder must confirm at least 6 employees who will actively perform IWB orders, each holding a valid ISO 9606-1 welder qualification and able to take on active on-call duty. Evidence: ISO 9606-1 certificates and welder CVs uploaded to Decision Advisor. General participation conditions (mandatory before award) include: liability insurance proof; acceptance of the contract and the non-disclosure declaration; economic/financial standing confirmations; VAT registration confirmation; e-invoicing confirmation; compliance with the IWB supplier code of conduct; registration in the IWB supplier portal; sanctions-free declaration and SECO list checks; subcontractor organigram and subcontractor controls; German language capability; acceptance of rules of conduct and safety regulations on IWB premises; required permits; a named site manager/key person; and confirmation of material and welding procedure requirements.

How bids are scored

Award is based on a 10,000-point scale with four weighted criteria: - ZK 1 Offer price (50%, max 5,000 points): The lowest total price receives full points. Offers with total costs at 1.75 times the lowest price or higher receive 0 points. Offers in between are scored linearly. Price is evaluated from the completed Annex A2 price sheet in CHF excl. VAT; an incomplete or altered price sheet may lead to exclusion. - ZK 2 Number of certified welders (10%, max 1,000 points): Total number of employed welders holding a valid ISO 9606-1 qualification, including the 6 required welders. - ZK 3 Years of professional welding experience (20%, max 2,000 points): Cumulative years of experience with valid ISO 9606-1 qualification across the 6 planned welders. - ZK 4 Sustainability (20%, max 2,000 points): Planned vehicle fleet for commuting and tool transport, declared in Annex A4 with the planned percentage of trips per vehicle for this contract.

Key requirements

• ✓24/7 on-call welding services for district heating network
• ✓Expertise in heat-distribution pipe systems and connections
• ✓Emergency response capability across entire Basel Fernwärmenetz

Procurement contact

The notice names a procurement contact for clarification questions.

CPV codes

Relevant sectors

About this sector

Heating and cooling funding supports heat pumps, district heating, thermal networks, efficient cooling and the removal of fossil boilers. It arrives through national support schemes, local authority programmes and procurement for heat networks. Applicants typically need heat demand assessments, a connection plan and an operator for the system.