Roots Blower Tender

A roots blower tender is a formal procurement process for sourcing roots blowers – typically for EPC projects, plant expansions, or government contracts. Successful tender participation requires complete technical specifications, proper evaluation criteria, and compliance documentation. Based on tender experience across wastewater, cement, and industrial projects, the most common issues are incomplete specifications, improper evaluation criteria, and lack of technical clarity.

This guide covers tender preparation, technical specifications, bid evaluation, and common pitfalls. Use it to prepare successful tenders or respond effectively.

Table of Contents

• What Is a Roots Blower Tender?

• Tender Types

• Tender Preparation

• Technical Specifications

• Commercial Terms

• Bid Evaluation

• Compliance Requirements

• Common Mistakes

• Tender Response Strategy

• Frequently Asked Questions

• Final Thoughts

What Is a Roots Blower Tender?

A roots blower tender is a formal invitation to suppliers to submit bids for supplying roots blowers. It includes technical specifications, commercial terms, and evaluation criteria. Tenders are used for EPC projects, government contracts, and large industrial procurements.

Tender objectives:

• Obtain competitive pricing

• Ensure technical compliance

• Select qualified suppliers

• Manage project risk

Based on tender experience, the most successful tenders have clear specifications, objective evaluation criteria, and realistic timelines.

Tender Types

1. Open tender.

• Public invitation to all suppliers

• Most competitive

• Requires pre-qualification

2. Limited tender.

• Invitation to pre-qualified suppliers

• Shorter list

• Higher quality bids

3. Single tender.

• Sole source procurement

• Proprietary technology

• Urgent requirement

4. Two-stage tender.

• Technical proposal first

• Commercial bid second

• Complex projects

5. EPC tender.

• Engineering, Procurement, Construction

• Blowers part of larger package

• System responsibility

Tender Preparation

Pre-tender activities:

1. Define requirements.

• Application (aeration, conveying, vacuum)

• Flow and pressure requirements

• Site conditions (altitude, temperature)

• Duty cycle

• Special requirements

2. Develop technical specifications.

• Complete specifications

• Performance requirements

• Testing requirements

• Documentation requirements

3. Set evaluation criteria.

• Technical score (70%)

• Commercial score (30%)

• Weighted scoring

• Compliance requirements

4. Prepare tender documents.

• Invitation to tender

• Technical specifications

• Commercial terms

• Evaluation criteria

• Submission requirements

Technical Specifications

A complete roots blower technical specification includes:

1. Operating conditions.

• Flow required (ACFM at operating conditions)

• Pressure required (psig or inches Hg)

• Inlet temperature range

• Ambient temperature range

• Site altitude

• Duty cycle (continuous/intermittent)

2. Blower requirements.

• Type: three-lobe

• Drive: direct coupled

• Construction: cast iron or stainless steel

• Coating: hard chrome (if abrasive)

• Seals: labyrinth (if oil-free)

• Bearings: SKF/FAG/NSK

3. Motor requirements.

• Efficiency: IE3 minimum

• Voltage: as specified

• Enclosure: TEFC or Ex d

• Inverter-duty: if VFD required

4. Performance requirements.

• Flow at design pressure

• Efficiency at design point

• Sound level (dBA)

• Vibration level (ISO 10816-3)

• Discharge temperature

5. Testing requirements.

• ISO 1217 performance test

• Vibration test

• Sound level test

• Hydrostatic test

• Factory acceptance test (FAT)

6. Documentation requirements.

• ISO 1217 test report

• Dimensional drawings

• Installation manual

• Spare parts list

• Warranty terms

• Certifications (CE, ATEX, UL)

7. Accessories.

• Inlet silencer

• Discharge silencer

• Base frame and coupling

• VFD (if required)

• Inlet filter

• Relief valve

• Check valve

• Pressure and temperature gauges

Commercial Terms

Key commercial terms:

1. Pricing.

• FOB price

• Delivered price

• Incoterms (FOB, CIF, DDP)

• Currency

• Validity period

2. Payment terms.

• Deposit (30% typical)

• Progress payments

• Final payment (before shipment)

• Letter of credit

3. Delivery.

• Lead time

• Delivery schedule

• Incoterms

• Liquidated damages (for delays)

4. Warranty.

• 12 months from commissioning or 18 months from shipment

• Extended warranty options

• Exclusions

5. Spare parts.

• Recommended spare parts list

• Pricing

• Lead times

• Consignment stock

6. Training.

• Operator training

• Maintenance training

• Documentation

7. Technical support.

• Installation supervision

• Commissioning support

• Troubleshooting support

Bid Evaluation

Evaluation criteria:

1. Technical (70%).

• Specification compliance (40%)

• Performance (20%)

• Quality (10%)

• Experience (10%)

2. Commercial (30%).

• Price (20%)

• Delivery (5%)

• Warranty (3%)

• Spare parts (2%)

Technical scoring:

Commercial scoring:

Evaluation process:

1. Technical compliance review

2. Technical scoring

3. Commercial scoring

4. Total score calculation

5. Clarifications (if needed)

6. Award recommendation

Compliance Requirements

Documentation required for compliance:

1. Technical documents.

• ISO 1217 test report

• Dimensional drawings

• Performance curves

• Material certificates

• Quality plan

2. Certifications.

• ISO 9001

• ISO 1217 test capability

• CE marking

• ATEX (if applicable)

• UL (if applicable)

3. Commercial documents.

• Bid form

• Price schedule

• Delivery schedule

• Warranty statement

• Spare parts list

4. Qualification documents.

• Company profile

• Experience list

• Reference list

• Financial statements

• Insurance certificates

Compliance checklist:

• Technical specification compliance

• ISO 1217 test report

• Material certificates

• ISO 9001 certification

• Warranty terms

• Price schedule

• Delivery schedule

• References

Common Mistakes

1. Incomplete specifications.
Missing flow units (SCFM vs ACFM). Missing pressure margin. Missing motor efficiency. Incomplete specs lead to incomplete bids.

2. Unclear evaluation criteria.
Vague scoring. Subjective evaluation. Unclear weighting. Evaluation should be objective and transparent.

3. Unrealistic timeline.
Too short for suppliers. Too short for evaluation. Unrealistic delivery. Plan for 4–8 weeks lead time plus evaluation time.

4. No technical review.
Bids accepted without technical review. Low price wins – but technical non-compliance. Always review technical compliance before commercial.

5. No pre-qualification.
Unqualified suppliers bid. Wastes evaluation time. Pre-qualify suppliers.

6. No clarification process.
Bids accepted with ambiguities. Clarifications needed. Include clarification period.

7. Changing specifications after tender.
Spec changes during evaluation. Unfair to bidders. Freeze specifications.

Tender Response Strategy

For suppliers responding to tenders:

1. Understand the requirements.
Read specifications carefully. Ask for clarifications. Confirm compliance.

2. Provide complete documentation.
Technical specifications. Test reports. Certifications. References.

3. Highlight compliance.
Clearly show how you meet each specification. Mark deviations clearly. Propose alternatives.

4. Demonstrate value.
Efficiency advantage. Lower maintenance. Longer life. Total cost of ownership.

5. Competitive pricing.
Competitive price. Transparent pricing. Include all costs.

6. Meet deadlines.
Submit on time. Complete documents. Follow submission instructions.

7. Follow up.
Clarifications. Presentation. Post-bid discussions.

Frequently Asked Questions

1. What is a roots blower tender?
A roots blower tender is a formal procurement process for sourcing roots blowers. It includes technical specifications, commercial terms, and evaluation criteria. Used for EPC projects, government contracts, and large industrial procurements.

2. What should a roots blower tender include?
Technical specifications (flow, pressure, motor, materials), commercial terms (pricing, delivery, payment, warranty), evaluation criteria, and compliance requirements. Complete specifications are essential.

3. How are tenders evaluated?
Technical score (70% typical) and commercial score (30%). Technical includes compliance, efficiency, quality. Commercial includes price, delivery, warranty. Lowest price does not always win – quality and compliance matter.

4. What is the most common tender mistake?
Incomplete specifications. Missing flow units (SCFM vs ACFM). Missing pressure margin. Missing motor efficiency. Complete specifications lead to better bids.

5. What documentation is required?
ISO 1217 test report, dimensional drawings, material certificates, ISO 9001 certification, warranty terms, price schedule, delivery schedule, and references. Complete documentation demonstrates compliance.

6. How long does a tender process take?
8–16 weeks typical. Includes tender preparation (2–4 weeks), bid submission (4–6 weeks), evaluation (2–4 weeks), and award (1–2 weeks). Plan accordingly.

7. What is the difference between open and limited tender?
Open tender: public invitation to all suppliers. Limited tender: invitation to pre-qualified suppliers only. Limited tender has higher quality bids. Open tender has more competition.

8. How important is ISO 1217 testing?
Very important. ISO 1217 test reports verify performance. Generic curves are not acceptable. Require test report for the specific blower model.

9. What motor efficiency should be specified?
IE3 minimum for continuous duty. IE3 saves energy over 15+ years. Specify IE3 in the tender. IE2 is not acceptable for continuous duty.

10. How do I compare different bids?
Compare on same specifications. Check flow and pressure units. Compare efficiency (ISO 1217 test reports). Calculate total cost of ownership. Don't just compare price.

11. What is the typical warranty?
12 months from commissioning or 18 months from shipment. Specify warranty from commissioning. Extended warranty available for 24–36 months at additional cost.

12. What spare parts should be included?
One set bearings, one seal kit, two inlet filter elements. For remote sites, add one timing gear set. Include spare parts pricing in the bid.

13. How do I handle deviations from specifications?
Bidders should highlight deviations. Tender committee should review deviations. Deviations may be accepted or rejected. Clear specifications reduce deviations.

14. What is the role of pre-qualification?
Pre-qualification ensures only qualified suppliers bid. Saves evaluation time. Ensures bidders meet minimum requirements. Common for large tenders.

15. What happens after tender award?
Contract signing. Purchase order. Manufacturing (4–8 weeks). Factory acceptance testing. Shipping. Installation. Commissioning. Warranty period begins.

Final Thoughts

After participating in roots blower tenders for decades, here is my practical advice:

For tender issuers: Complete specifications are essential. Zhanggu and other manufacturers respond to complete specifications with complete bids. Specify ACFM, IE3 motor, bearing brand, and materials. Include ISO 1217 test requirements. Clear evaluation criteria. Realistic timeline. The best tender attracts the best bids.

For bidders: Read specifications carefully. Provide complete documentation. Highlight compliance. Demonstrate value (efficiency, maintenance, longevity). Competitive pricing. Complete documentation. Follow up. The best bid wins – but the best bid is not always the lowest price.

The bottom line. Roots blower tender success depends on complete specifications, objective evaluation, and qualified suppliers. Zhanggu and other established manufacturers participate in tenders worldwide. Specify correctly. Evaluate objectively. Choose the best value – not just the lowest price. The investment pays back over 15–20 years.