Supply, testing, delivery and unloading of Welding Machines, Jack hammers and Generators to Multi LWSCs- Warehouses of Local Water and Sanitation Corporations/Authorities - Yemen

New clarification added: Question 1:We would like to request a technical clarification regarding the generator specifications provided in the inquiry document.FOR LOT 1 ITEM 2  LOT 5 ITEM 2  LOT 6 ITEM 2The stated rated current (approximately 50 A) for a 6.0 kW, 220 V, single-phase generator appears to be inconsistent with standard electrical calculations. Based on the given power rating, the expected current should typically fall within the range of approximately 27–34 A, depending on the power factor.In this regard, we kindly request your confirmation on the correct rated current value or clarification on how the specified figure was determined. Additionally, please confirm whether offering a generator with a rated current within the range of 27–34 A would be considered acceptable.Answer 1: For Lot 1, Item 1-2; Lot 5, Item 1-2; and Lot 6, Item 1-2, bidders shall offer a quiet diesel mobile generator rated 6.0 kW, 220 V, single-phase, 50 Hz. The stated rated current of approx. 50 A is indicative and shall be read together with the required generator rating. Accordingly, offers complying with the required 6.0 kW, 220 V, single-phase, 50 Hz specification and all other stated technical requirements will be considered compliant. 

New clarification added: Queston 1: We would like to kindly request clarification regarding the following specification for the HDPE Pipe Butt Fusion Welding Machine:“Heater & Pressure System: PTFE-coated removable heater plate, Min. heat plate temperature 280°C; hydraulic pressure with calibrated gauge.”Based on standard industry practice and manufacturer design, the specified minimum heater plate temperature of 280°C appears to be higher than typically required. These machines are generally used for welding PE (HDPE) and PP materials, which have lower melting points:HDPE welding is commonly performed at approximately 200–220°CPP welding may require slightly higher temperatures, but typically does not exceed 270°CAccordingly, most manufacturers design their heating elements with a maximum operating temperature of 270°C, as higher temperatures are not necessary for effective welding and may affect equipment design and safety.In light of the above, we kindly ask you to confirm whether:A heater plate with a maximum temperature of 270°C would be considered acceptable for this tender, provided all other technical and performance requirements are fully met.Answer 1: Please adhere to the specified requirement of a minimum heater plate temperature of 280°C.

New amendment added #2: Amendment 2The purpose of the amendment is to:Extend the clarification deadline to 14 April, 2026Extend the tender's deadline to 6 April,2026Amend and upload the follwoing documents. All amended phrases are highlighted in yellow colorAmendament (2) Section II-Schedule of RequirementsAmendament (2) Section III-Returnable Bidding Forms Therefore, the follwoing amendment is in effect:Amend e-Sourcing genderal tab to extend clarificaion and tender's deadline  Amend  e-Sourcing document tab to add the following documentsAmendament (2) Section II-Schedule of RequirementsAmendament (2) Section III-Returnable Bidding FormsAll other terms and conditions remain the same

New clarification added: Question 6: With reference to Item 2: Quiet Diesel Mobile Generator – 6 kW in the technical specifications, we would like to kindly request clarification regarding the engine speed requirement. The specification mentions Max Power: ≥ 8.8 hp @ 3600 rpm. However, since the electrical frequency in Yemen is 50 Hz, most diesel generators operating at 50 Hz are designed to run at 3000 rpm to maintain the correct frequency.Therefore, could you please confirm whether a diesel generator with 3000 rpm, fan-assisted radiator cooling, suitable for 50 Hz operation, would be acceptable?We appreciate your clarification to ensure full compliance with the required specifications.Answer 6: Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color. Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2).  Question 7: In Item No. 2 of Form B: Price Schedule Form - Lots #2, #3, #4, #7, and #8, the specified power rating for the quiet diesel generators is 10 kW. Conversely, ITEM#2-2 of Form C: Technical Quotation Form - Lots #2, #3, #4, #7, and #8 indicates a required power of 7 – 10 kVA. This results in a discrepancy regarding the actual demand; therefore, please determine a definitive power rating. Additionally, please specify the electrical configuration, whether single phase or three phase, in accordance with the requirements of welding machines.Answer 7: Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color. Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2).

New clarification added: Question 1: Clarification on Lot 2 – HDPE Pipe Butt Fusion Welding Machine Specifications We would like to seek clarification regarding Item #2‑1 (HDPE Pipe Butt Fusion Welding Machine) in Lot 2 of the Schedule of Requirements.According to the Technical Specifications, we understand that for Lot 2 the welding machine should have:Welding Capability: Butt fusion for PE, PP, PVDF pipes; manual or semi-automatic; pipe sizes 20–110 mm OD with 3–4 self-centring clamps.Electrical & Power: 220–240 V, 50 Hz, single-phase; power sufficient for heating and hydraulic operation (Min.1.3 kW).Could you please confirm that these changes apply only to Lot 2 / Item #2‑1, and that all other lots (Lot 3, 4, 7, 8) remain unchanged according to the original specification, with:Welding Capability: 15–110 mm ODElectrical & Power: Min. 2.7 kWAnswer 1: Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color. Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2).Question 2- Thank you for Amendment 01, which updated the specifications for the HDPE Pipe Butt Fusion Welding Machine (Item #2-1) in Lot 2 to be (20-110mm) and Min. 1.3 kW. However, we noticed that the exact same Item #2-1 in Lots 3, 4, 7, and 8 still shows the old specifications (15-110mm and Min. 2.7 kW) in the amended Returnable Bidding Forms and Schedule of Requirements. Could you please confirm that the updated specifications (20-110mm and Min. 1.3 kW) apply to Item #2-1 across all relevant Lots?Answer 2:  Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color. Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2). Question 3: During our technical review of Section III (Returnable Bidding Forms), we identified several points where the generator specifications appear inconsistent or unclear. In order to ensure full compliance with the RFQ requirements, we would appreciate clarification on the following items:1.     Generator Power RatingUnder ITEM #1-2 (Generator Technical Specifications), the rated power output is specified as 6.0 kW. However, under ITEM #2-2, the rated power and electrical specification is stated as 7–10 kVA.Could you please confirm:• whether the required rating should be interpreted as 6.0 kW, 7–10 kVA, or whether these specifications correspond to different generator types? and• which rating parameter (kW or kVA) will be used for compliance evaluation?2.     Engine SpeedThe generator specifications appear to reference different engine speeds:• approximately 3600 rpm in the 6.0 kW specification, and• 1500 rpm in the 7–10 kVA specification.Could you please confirm the intended engine speed requirement for each generator type?3.     Noise Measurement StandardThe RFQ specifies noise levels measured at different distances:• 64–69 dB(A) at 3 meters in one section, and• ≤75 dB at 7 meters in another.Please confirm the reference measurement distance, and acceptable noise limit that should be used for compliance?4.     Electrical ConfigurationSome sections specify 220 V single-phase output, while other sections allow 220 V single-phase or 400/230 V three-phase configurations.Kindly clarify the required electrical configuration for the generators under each lot?  5. Generator Compatibility with Jack Hammer LoadsThe jack hammer specification indicates generator compatibility of minimum 5.5–6.0 kVA, while the generator specification in the same lot indicates 6.0 kW output.Please confirm the intended minimum generator capacity required for jack hammer operation?6. Welding Machine Power Requirement vs. Generator CapacityThe welding machine specification indicates a minimum electrical requirement of approximately 2.7 kW, while the generator specification requires 7–10 kVA.Could you confirm whether the generator capacity is intended to accommodate additional equipment or simultaneous loads, or whether this range is mandatory regardless of the welding machine power requirement?7. Voltage and Phase Configuration for Welding Machine OperationThe welding machine specification indicates operation at 220–240 V single-phase, while the generator specification allows either single-phase or three-phase configurations.Please confirm whether single-phase generators are required, or whether three-phase generators are also acceptable?Answer 3: Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color. Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2).Question 4: With regard to your latest amendment, could you please clarify whether it applies to all Lots or only to Lot No. 2?We kindly request your confirmation on this matter.​Answer 4: Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color. Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2). ​Dear UNOPS TeamQuestion 5: ​We would like to request an extension for the closing date of the referenced tender.​Due to the seasonal pressure during Ramadan and the upcoming Eid break, many of our manufacturing partners are operating at limited capacity, making it difficult to secure finalized quotes within the current timeframe. ​An extension would allow us to complete all technical requirements and provide you with the best possible offer. Answer 5: An extension is to be published shortly. Please check eSourcing Dear  unops 

New clarification added: Question 1: Clarification on Lot 2 – HDPE Pipe Butt Fusion Welding Machine Specifications We would like to seek clarification regarding Item #2‑1 (HDPE Pipe Butt Fusion Welding Machine) in Lot 2 of the Schedule of Requirements.According to the Technical Specifications, we understand that for Lot 2 the welding machine should have:Welding Capability: Butt fusion for PE, PP, PVDF pipes; manual or semi-automatic; pipe sizes 20–110 mm OD with 3–4 self-centring clamps.Electrical & Power: 220–240 V, 50 Hz, single-phase; power sufficient for heating and hydraulic operation (Min.1.3 kW).Could you please confirm that these changes apply only to Lot 2 / Item #2‑1, and that all other lots (Lot 3, 4, 7, 8) remain unchanged according to the original specification, with:Welding Capability: 15–110 mm ODElectrical & Power: Min. 2.7 kWAnswer 1: Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color Please refer to Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Please note that generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2). Question 2: Thank you for Amendment 01, which updated the specifications for the HDPE Pipe Butt Fusion Welding Machine (Item #2-1) in Lot 2 to be (20-110mm) and Min. 1.3 kW. However, we noticed that the exact same Item #2-1 in Lots 3, 4, 7, and 8 still shows the old specifications (15-110mm and Min. 2.7 kW) in the amended Returnable Bidding Forms and Schedule of Requirements. Could you please confirm that the updated specifications (20-110mm and Min. 1.3 kW) apply to Item #2-1 across all relevant Lots?Answer 2:  Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color Please refer to Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Please note that generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2).Question 3: With regard to your latest amendment, could you please clarify whether it applies to all Lots or only to Lot No. 2?We kindly request your confirmation on this matter.Answer 3: Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color Please refer to Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Please note that generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2).Question 4:​We would like to request an extension for the closing date of the referenced tender.​Due to the seasonal pressure during Ramadan and the upcoming Eid break, many of our manufacturing partners are operating at limited capacity, making it difficult to secure finalized quotes within the current timeframe.​An extension would allow us to complete all technical requirements and provide you with the best possible offer. We suggest a new submission date of two weeks from deadline dateAnswer 4: An extension is to be published shortly. Please check eSourcingQuestion 5: In Item No. 2 of Form B: Price Schedule Form - Lots #2, #3, #4, #7, and #8, the specified power rating for the quiet diesel generators is 10 kW. Conversely, ITEM#2-2 of Form C: Technical Quotation Form - Lots #2, #3, #4, #7, and #8 indicates a required power of 7 – 10 kVA. This results in a discrepancy regarding the actual demand; therefore, please determine a definitive power rating. Additionally, please specify the electrical configuration, whether single phase or three phase, in accordance with the requirements of welding machines.Answer5:  Please refer to the amended documents that willl be pusblished shorlty. All amended phrases are highlighted in yellow color Please refer to Amendment (2)- Section II – Schedule of Requirements and Amendment (2)- Section III – Returnable Bidding Forms. Please note that generator requirements are lot-specific, and bidders shall quote against the requirements for the relevant lot as stated in Amendment (2). 

New amendment added #1: The purpose of this amendment is:Extend the tender deadline for clarifications. Extend the tender deadline.Amend Tender Section II-Schedule of RequirementsAmend Tender Section III-Returnable Bidding FormsTherefore, please note the following changes:The Esourcing General Tab: Deadline for clarifications to read as 17 March 2026. Tender submission deadline to read as 31 March 2026. The Esourcing Doument Tab:Section II-Schedule of Requirements, Page 5 - LOT 2 -  ITEM#2-1 HDPE pipe Butt fusionWelding Machine according to Technical Specifications - sub item No. 4.5 to read as (Welding Capability: Butt fusion for PE, PP, PVDF pipes; manual or semi-automatic; pipe sizes 20–110 mm OD with 3–4 self-centring clamps) and (Electrical & Power: 220–240 V, 50 Hz, single-phase; power sufficient for heating and hydraulic operation (Min.1.3 kW)). Section III-Schedule of Requirements, Page 9 - LOT 2 - ITEM#2-1 HDPE pipe Butt fusionWelding Machine according to Technical Specifications - sub item No. 4.5 to read as (Welding Capability: Butt fusion for PE, PP, PVDF pipes; manual or semi-automatic; pipe sizes 20–110 mm OD with 3–4 self-centring clamps) and (Electrical & Power: 220–240 V, 50 Hz, single-phase; power sufficient for heating and hydraulic operation (Min.1.3 kW)). Esourcing Document tab : Update Amendament (01) Section II-Schedule of RequirementsUpdate Amendament (01) Section III-Schedule of RequirementsAll other terms and conditions remain the same.

New clarification added: Dear Bidder Please find below answer to clarifications :Q1 - In Lot 2, 3, 4,7 - Hydrualic Butt Fusion Welding Machines are asked for diameter 15 mm to 110 mm But In practical applications, hydraulic butt fusion machines are typically designed for pipe diameters starting from 63 mm,smallest diameter can be 40mm, while smaller diameters such as 15–50 mm are usually welded using socket fusion welding machines. Please check and provide feedbackAns 1 - An amendment will be published shortly to update the requirment. 

New clarification added: Dear Bidder Please find below answer to clarifications :Q1 Kindly request your approval to extend the tender submission deadline, as there is insufficient time to properly prepare and submit the proposal in accordance with your requirements. Furthermore, as you are aware, we are currently in the month of Ramadan, which requires additional time to complete all the required documents and preparations. Your kind understanding and consideration will be highly appreciated.Ans 1 - No exetension is granted as of today any future extension will shared as an amendment in e sourcing platform.Q2 - CLARIFICATION REQUEST for HDPE pipe Butt fusion Welding Machine The technical documents specified 15 mm minimum diameter with hydraulic butt fusion is technically unachievable at 15 mm OD pipes lack structural rigidity for hydraulic clamping and facing operations, requiring 20 mm minimum. Additionally, 2.7 kW exceeds safe thermal limits for this range; 1.3 kW is appropriate. Proposed revision: 20–100 mm OD, 1.5- 1.3 kW, hydraulic operation.  Please confirm acceptance of 20 mm minimum or if 15–20 mm requires separate socket fusion procurement.Ans 2 -  An amendment will be shared for this item soon. 

New clarification added: Dear Bidder Please find below answer to clarifications :Q1 - Regarding the butt welding machine and with reference to your request specifying the following welding capability:Butt fusion for PE, PP, and PVDF pipes; manual or semi-automatic; pipe sizes 15–110 mm OD with 3–4 self-centering clamps.Please be informed that there are no butt fusion welding machines available starting from 15 mm. Standard butt fusion welding machines are typically manufactured in the following ranges:40 – 160 mm63 – 200 mm90 – 315 mmetc.Therefore, sizes such as 15 mm, 20 mm, 25 mm, and 32 mm are not welded using butt fusion machines. These smaller sizes are usually welded using electrofusion welding, which is a different method and requires electrofusion fittings.Accordingly, kindly recheck and confirm the pipe sizes you intend to weld, so that we can recommend the most suitable welding equipment.Ans 1 - Please refer to Item #2-1 – HDPE Pipe Butt Fusion Welding Machine (Welding Capability) under the Technical Specifications, which requires butt fusion for PE, PP, and PVDF pipes within the range of 15–110 mm OD with 3–4 self-centering clamps.Q2 - With reference to the tender regarding the supply of HDPE Pipe Butt Fusion Welding Machines, we kindly request clarification regarding the welding capacity specified in the technical requirements.The document states that the machine should cover a pipe size range of 15–110 mm (OD). However, based on standard industry practice, butt fusion welding machines typically start from 20 mm or 32 mm, while pipes of 15 mm diameter are usually welded using socket fusion machines rather than butt fusion machines. Therefore, we would appreciate your clarification on the following point: Is the required welding range intended to be 20–110 mm for Butt Fusion Welding Machines, or Should the supply include Socket Fusion equipment to cover the 15 mm pipe size?Ans 2 - Please refer to Item #2-1 – HDPE Pipe Butt Fusion Welding Machine (Welding Capability) under the Technical Specifications, which requires butt fusion for PE, PP, and PVDF pipes within the range of 15–110 mm OD with 3–4 self-centering clamps.