Completion of dry room and minor repairs to seedbank facility at kirstenbosch national botanical garden, cape town (sanbi G591/2026)

The project covers the completion of a dry room and minor repair work at the SANBI seedbank facility located in the Kirstenbosch National Botanical Garden, Cape Town. The document supplied is the technical datasheets appendix (Appendix D), which forms part of the tender specification package.

Scope of work:

• Completing the dry room construction at the Kirstenbosch National Botanical Garden seedbank facility.
• Executing minor repair work to the same facility.

Document classification:

• ECSA project stage: Stage 4 (General Specifications).
• Installations covered: Mechanical.
• Project reference: G591/2026.

Technical datasheets supplied for this work:

• Condenser datasheet.
• Air handling unit (AHU) datasheet.

The package is Appendix D – Technical Datasheets.

Design and consulting team (from document control):

• Design Engineer: T. C Mango (Optimum Engineering Consultants).
• Project Engineer: D.P Manjonjo (Optimum Engineering Consultants).
• Principal Engineer: N. Muromba (Optimum Engineering Consultants).

Addresses:

• SANBI (Client): Rhodes Dr, Newlands, Cape Town, 7735.
• Consulting Engineers (Optimum Engineering Consultants): Unit 46 - Derby Ranch, 182 Derby Ranch, Northriding 2169.

Scope: Completion of the dry room and minor repair work to the seedbank facility at the Kirstenbosch National Botanical Garden.

HVAC work includes supply and installation of ducted air-conditioning and ventilation systems with specified airflows (e.g., 75 L/s, 150 L/s, 250 L/s, 300 L/s) and duct sizes (round and rectangular, e.g., Ø200mm, Ø250mm, Ø300mm, Ø350mm).

Air handling units include supply air units, return air, re-heater, and dehumidifier options, with cooling capacities (e.g., 7.1 kW, 8.0 kW, 8.5 kW, 9.0 kW, 10.2 kW, 11.5 kW, 12.1 kW) and electrical supply (1-phase 220-240V 50Hz, 3-phase 380-415V 50Hz).

Ducting and insulation requirements: galvanised sheet steel ducts, thermally insulated with 25mm insulation, externally cladded where outdoors, with hangers and supports per specified spacing.

Compliance with SMACNA standards and installation in accordance with detailed drawings (drawing OP23/M07/HVAC01).

Contractor must verify all dimensions on site before fabrication and report any discrepancies to the consultants.

Advertising date: 27 October 2026

Compulsory briefing session: Monday 9 November 2026 at 11:00, at the Garden Office Boardroom, Kirstenbosch National Botanical Garden, Cape Town. Attendance is mandatory; the signed briefing certificate must be submitted with the tender.

Cut-off for enquiries: 16 November 2026 at 11:00

Closing date and time: 25 November 2026 at 11:00

Employer's agent (technical queries):

• Name: Mr P. Manjonjo
• Role: SANBI Representative, Optimum Engineering Consultants (Pty) Ltd
• Telephone: 081 500 1595
• Email: [email protected]

SANBI Supply Chain Management (SCM) representative:

• Email: [email protected]

Technical enquiries alternate:

• Email: [email protected]

Postal address for communication: Private Bag X101, Silverton, 0184

Service/delivery address: Kirstenbosch National Botanical Garden, Cape Town

Submission method: Tenders must be delivered physically to the tender box at the address below. Facsimile, e-mail, or telephonic submissions are not accepted.

Submission address: Biodiversity Centre, Pretoria National Botanical Garden, 2 Cussonia Avenue, Brummeria, Pretoria.

Packaging requirements: Submit two original envelopes — Original Document A (Financial Envelope) with all pricing, and Original Document B (Technical Envelope) with everything except pricing. Include a USB containing a copy of the technical proposal (without pricing) inside the envelope marked Original Document B, together with the technical original. Place both original envelopes inside an outer envelope, sealed, addressed as specified, labelled with the tender number SANBI G591/2026, the tender title, the tenderer's name, and the words 'Not to be opened before the tender opening'. The financial envelope must also state 'NOT TO BE OPENED WITH THE TECHNICAL ENVELOPE'.

Pricing information anywhere on the USB leads to disqualification.

Returnable documents (all must be fully completed and signed):

• CSD registration report (for each joint venture member if applicable).
• Printed active CIDB contractor listing.
• Letter of Good Standing from the Compensation Commissioner (COIDA).
• Signed compulsory site briefing certificate.
• All applicable SBD forms.
• CV and proof of professional registration for the proposed Construction Health & Safety Officer and Contracts/Project Manager.
• Trade test certificate, SARACCA/SAQCC gas registration, SANS 10147 refrigerant handling certification, and authorisation to issue Certificates of Conformity for the proposed Site Foreman/Refrigeration Mechanic.
• Fully completed Appendix E – Equipment Offered.

Disqualification risks: Omission of any required documentation, inclusion of pricing in the technical envelope or on the USB, late submission, or failure to pack as prescribed.

Tenders are assessed in three stages:

Stage 1 – Eligibility and administrative compliance: Bidders must meet all mandatory requirements and submit all returnable documents to proceed.

Stage 2 – Functionality (quality), scored out of 100:

• Implementation method and project plan/programme: 25 points (methodology 15, weekly programme 10).
• Contractor's experience: 25 points — at least five (5) similar, valid and verifiable projects completed in the last ten (10) years, each with appointment letter/Purchase Order, completion certificate, telephonic reference, commissioning report, and a SARACCA/SAQCC Refrigeration Gas Certificate of Conformance. Submissions without all five items for a project are not accepted as references.
• Contractor's resources – personnel: 30 points — CVs for the Contracts/Project Manager (15 points) and Site Foreman/Refrigeration Mechanic (15 points), scored on years of experience.
• Completion of Appendix E – Equipment Offered: 20 points — full completion plus corresponding project-specific supplier/manufacturer datasheets.

Minimum qualifying score for functionality: 70 points out of 100. Bidders scoring below this are not eligible for further evaluation.

Stage 3 – Tender price and preference: Price is scored using the formula NF = Wf × [1 − (Pt − Pmin)/Pmin], where Wf is 90 if the tender price (incl. VAT) of all responsive tenders exceeds R50 million, otherwise 80 (i.e. 90/10 or 80/20 preference point system). The bidder with the highest combined price and preference score is recommended, unless SANBI invokes its discretion under section 2(1)(f) of the PPPFA not to appoint a bidder with unsatisfactory past performance on any contract with SANBI or another organ of state.

The scope involves completing the dry room and performing minor repair work to the seedbank facility at Kirstenbosch National Botanical Garden, Cape Town.

The works include construction-related activities and associated HVAC (heating, ventilation and air conditioning) work, as evidenced by the referenced HVAC drawing OP23-M07-H01 Rev03.

The contract covers the full project life-cycle: procurement, mobilisation, installation, testing, commissioning and close-out.

The tenderer must demonstrate a project-specific implementation methodology, a weekly project programme with milestones, and assign key personnel (Contracts/Project Manager, Site Foreman/Refrigeration Mechanic, and Construction Health & Safety Officer).

Equipment offered must be listed in Appendix E and supported by corresponding supplier/manufacturer datasheets.

Technical specifications are detailed in Appendix B (Scope of Work and Technical Specifications) and Appendix A (General Specifications), with supporting technical datasheets in Appendix D. These are attached to the tender document.

Pricing must be submitted in the Bill of Quantities (Part C2.2) and must follow the pricing instructions (C2.1).

The two-envelope system requires all pricing in the Financial Envelope (Original Document A) only.

If an alternative tender is submitted, the modified Pricing Data must include an amount equal to 5% of the amount tendered for the alternative offer to cover the Employer's costs in confirming the acceptability of the detailed design.

Financial capacity: No specific turnover or financial capacity threshold stated beyond CIDB grading requirements.

Bid security: No specific bid guarantee or bond percentage stated; the document includes a standard Construction Guarantee form (C1.3) but the percentage is not specified.

CIDB registration: Required grading 3ME or higher (or capability to be so before evaluation). Joint ventures: every member must be CIDB-registered; lead partner must have 2ME; combined grading must be 3ME or higher.

CSD registration: Must be registered on the National Treasury Central Supplier Database at closing, or submit proof of application within 21 days after closing; otherwise the tender will not be considered.

Tax compliance: Not explicitly mentioned beyond CSD.

COIDA: Letter of Good Standing from the Compensation Commissioner (Department of Labour) required.

Register of Tender Defaulters: Bidders or any director/shareholder listed there are disqualified.

Safety: Must comply with the Occupational Health and Safety Act, 1993 and Construction Regulations, 2014.

Personnel qualifications:

• Construction Health & Safety Officer: valid SACPCMP professional registration (candidate registrations not accepted).
• Contracts/Project Manager: professional registration with SACPCMP (as Professional Construction Project Manager or Construction Manager), or with ECSA (as Professional Engineer, Professional Engineering Technologist or Technician). Candidate registrations not accepted.
• Site Foreman/Refrigeration Mechanic: valid trade test certificate in Refrigeration or Air-Conditioning; SARACCA/SAQCC gas registration as Refrigeration Mechanic; Category B registration; certification for Refrigerant Groups A1 and A3 per SANS 10147; authorisation to issue Certificates of Conformity.

B-BBEE: Preference points will be awarded under the 80/20 or 90/10 system, but no specific B-BBEE level threshold or evidence forms are listed in the visible text.

Standard forms: The SBD forms (including SBD 4 Declaration of Interest and SBD 8 Past SCM Practices) must be completed and signed.

The tender is for the appointment of a service provider to complete dry room construction and minor repair work to the seedbank facility at Kirstenbosch National Botanical Garden, Cape Town. This appendix is a schedule for the equipment the contractor will supply, covering the condenser, air-handling unit, filter sections, cooling coil, electric heater bank, supply fan, and associated accessories. The schedule must be completed and submitted with supporting datasheets.

Employer: South African National Biodiversity Institute (SANBI)

Address: Rhodes Dr, Newlands, Cape Town, 7735

Consulting Engineers: Optimum Engineering Consultants

Address: Unit 46 – Derby Ranch, 182 Derby Ranch, Northriding 2169

Compiled by: T.C. Mango, Design Engineer

Reviewed by: D.P. Manjonjo, Project Engineer

Signed by: N. Muromba, Principal Engineer

Returnable documents: Complete and submit Appendix E – Equipment Offered with supporting datasheets for every piece of equipment offered. No other returnable forms are stated.

Submission method: As per the main tender document (not stated in this appendix).

The tender is for the completion of a dry room and minor repair work to the seedbank facility at Kirstenbosch National Botanical Garden, Cape Town. This appendix covers the equipment to be offered by the contractor, including:

• Condenser: manufacturer, model, capacity, refrigerant details, power input, capacity control, GWP, SEPR at -10°C and -35°C, rated COP at 32°C, sound pressure, dimensions, weight, compressor and fan type, airflow, electrical supply, operating range.
• Air-handling unit: model, reference, modules, construction, heat recovery, panel material, supply airflow, dampers, plenum, casing, dimensions, weight, controller.
• Filter sections: primary, HEPA and bag filters, including magnehelic gauge.
• Cooling coil – DX (R410A): type, duty, circuits, rows, fins/inch, fin and tube material, airflow, face velocity, pressure drop, entering/leaving air temps, refrigerant, condensate produced.
• Electric heater bank: heating capacity, stages, airflow, leaving air temp, pressure drop.
• Fan section – supply fan: model, quantity, airflow, total/static pressure, motor input power, sound levels, rotation speed, accessories.
• Accessories: bulkhead lights and switch, magnehelic gauge assembly, magnehelic/manometer cover, VRF kit fitment, VRF electrical interface, VEE drip tray, isolator (GEWISS large), emergency stop button — each marked Provided or Not Provided.

Supporting datasheets must be submitted with the completed schedule.

ECSA project stage: Stage 4 (General Specifications). No specific compliance requirements stated in this appendix.

The works comprise the complete supply, installation, testing, commissioning and handover of a refrigeration-based HVAC system for the Dry Room in the Seedbank at Kirstenbosch National Botanical Garden, Cape Town. Includes supply of all labour, materials, equipment, tools, transport, supervision and specialist services. The contractor must supply and install a commercial refrigeration condensing unit matched to a double-skin DX Air Handling Unit with cooling coil, electric heater bank, plug fan, filters, HEPA filtration, heat recovery section, monitoring sensors, Carel controller, terminal boxes, drip tray and supports. Works include insulated ductwork tie-ins to existing ducting, refrigeration copper pipework, electrical works, and safe removal and disposal of existing AHU, condenser and dehumidifier units. Additional works include VRV and freezer room repairs, door repairs, plumbing installations, hydroboil replacement, monitoring system installation and making good building works. All components must be new, unused, compliant with relevant SANS, ASME, EN, and ISO standards, and installed in accordance with accepted engineering practice.

Submission address:

SANBI (South African National Biodiversity Institute)

Rhodes Dr, Newlands

Cape Town, 7735

Consulting Engineers:

Optimum Engineering Consultants

Unit 46 - Derby Ranch

182 Derby Ranch

Northriding 2169

Bidders must be registered on the Central Supplier Database (CSD) and hold a valid SARS tax clearance. B-BBEE compliance is required. A minimum of one Category B Refrigeration Mechanic must serve as Site Foreman, registered with SAQCC Gas (SARACCA), authorised for Refrigerant Groups A1 and A3, holding a Trade Test qualification, verifiable on the SAQCC Gas registry, and authorised to issue electronic Certificates of Compliance (COCs) as per the letter dated 24 February 2023. All workmanship and installation must comply with SANS 10147 and SANS 10142-1.

Scope of work: Complete supply, installation, testing, commissioning and handover of a refrigeration-based HVAC system for the Dry Room in the Seedbank at Kirstenbosch National Botanical Garden, Cape Town. Includes all labour, materials, equipment, tools, transport, supervision and specialist services.

Key equipment:

• One LREQ20BY1 inverter-driven low-temperature condensing unit
• One factory-assembled double-skin DX Air Handling Unit (Model MAH C)
• Full refrigeration interconnection piping (liquid and suction lines)
• Electric heater bank (9 kW)
• Plug fan assembly
• Multi-stage air filtration (primary, secondary, HEPA)
• Environmental monitoring instrumentation
• Electrical control panel and power distribution
• Safety, interlock, and communication wiring

Additional works:

• VRV and freezer room repairs
• Door repairs
• Plumbing installations
• Hydroboil replacement
• Monitoring system installation
• Making good building works

Performance targets:

• AHU airflow: 303 L/s
• Cooling duty (DX coil): ≥20.89 kW
• Off-coil temperature: –10.4°C
• Refrigerant type: R410A
• Total refrigerant charge: ~18.5 kg
• Evaporating temperature: –27°C
• Ambient design condition: 32°C

Installation requirements:

• AHU installed level with proper access
• Condensing unit on vibration-isolated plinth
• Pipe supports per manufacturer spacing
• No crushing or deformation of copper tubes
• Brazing with nitrogen purge mandatory
• Cable trays and conduits neatly routed
• All terminations ferruled and labelled
• Isolators installed within 1.5 m of equipment

Testing and commissioning:

• Pressure, leak, vacuum testing
• Refrigerant charging
• Air balancing to 303 L/s
• Filter pressure drop measurement
• Insulation resistance, earth continuity, phase rotation, control logic verification
• Cooling performance tests, heater tests, sensor calibration, alarm testing

Handover deliverables:

• Commissioning report
• Refrigerant log sheet
• Electrical COC
• Refrigeration COC
• O&M manuals
• As-built drawings
• Training certificate

Quality control: Contractor must implement Inspection Test Plans (ITPs), material approvals, method statements, risk assessments, site checklists, and a final QA dossier. Building works (making good): restore all affected building surfaces including minor brickwork, wall chases or penetrations, crack repairs, painting, door adjustments, sealing of openings; finishes must match existing surfaces. Health, safety and environmental compliance: comply with OHS Act, Construction Regulations, refrigerant handling regulations, and environmental protection measures; provide safe work procedures, PPE, MSDS for chemicals, and emergency response plan. Warranty: 12-month workmanship, 24-month equipment.

CSD registration: Required (stated in evaluation criteria)

Tax clearance: Valid SARS tax clearance required (stated in evaluation criteria)

B-BBEE: Compliance required (no specific level or thresholds stated)

CIDB grading: Not stated

Professional registrations: Site Foreman must be a Category B Refrigeration Mechanic registered with SAQCC Gas (SARACCA), authorised for Refrigerant Groups A1 and A3, hold a Trade Test qualification, be verifiable on the SAQCC Gas registry, and be authorised to issue electronic COCs.

Standards compliance: SANS 10147, SANS 10142-1, EN 378, ISO 5149, ASME B31.5, ISO 559, SMACNA, ISO 9001, ISO 14001, OHS Act, Construction Regulations.

Comply with OHS Act, Construction Regulations, refrigerant handling regulations, and environmental protection measures. Provide safe work procedures, PPE, MSDS for chemicals, and emergency response plan. Equipment includes safety controls (high/low pressure switches, heater over-temperature protection, fan motor overload protection, emergency stop) and safe installation procedures.

Environmental performance targets: AHU airflow 303 L/s, cooling duty ≥20.89 kW, off-coil temperature –10.4°C, refrigerant R410A (GWP 2087.5), total charge ~18.5 kg, evaporating temperature –27°C, ambient design 32°C. Compliance with ISO 14001 (Environmental Management) and environmental protection measures.

Warranty requirements: 12-month workmanship warranty, 24-month equipment warranty (model-based), defect resolution within specified timeframes. Installation requirements as per specifications; workmanship must be neat, aligned, free of defects, in accordance with SANS standards, and subject to inspection at each stage.