RFQ for supply and delivery of pressure gauges ( Lot 1) strainers (Lot 2) and supply and delivery of self cleaning strainers (Lot 3)  in Kabul, Afghanistan

New clarification added: Question No # 20;Hope you are doing well,We are preparing the quotation and kindly ask you to confirm the following details to ensure we offer the most suitable products:1: Sealing material: EPDM, NBR, or Viton?2: Connection type: Are both ends flanged?3: Mesh/Filter precision: Confirm the 1mm mesh means retaining particles larger than 1mm. Is that correct?4: Coating: Any internal/external coating required (e.g., FBE epoxy)?5: Third-party testing: What specific standards and test items do you require? (e.g., chemical analysis, hydrostatic test, dimension check)Please kindly advise on the above. We will send you the official quotation once we have all the details.Answer to Question No # 20;Dear Bidder,Thank you for your inquiry. Please find below our response to your clarification request.The sealant should be suited to the fluid, which is river water. EPDM is acceptableWe assume you are enquiring about the strainers - only the end attaching to the foot valve is flanged. A 1mm mesh should prevent particles larger than 1mm passing through into the pump intakeFor strainers, Coating is specified in item 2.5 of Form DFor gauges, the materials are to comply with the standards indicated in Form D item 1.2, 1.3 and 2.1For strainers: Testing is specified in items 4.1, 4.3 and 4.4 of Form D, as well as in the second tab “Testing requirements “ of form DFor gauges, testing requirements are indicated in items C2 and 3 of form D We trust that the above clarifications address your queries.Kind regards,UNOPS Procurement Team

New clarification added: Question no #19;Dear UNOPS Procurement Team,We are preparing our quotation for the above tender and respectfully seek your clarification on one technical point.In your Responses No. 03, 05, 06, and 08, you stated that the foot valve will be "upstream of the strainer" — meaning:Foot Valve → StrainerHowever, in a supplementary clarification (Answer 1), we note the wording that the strainer is "located on the intake pipe upstream of the foot valve" — which suggests the reverse:Strainer → Foot ValveCould you please confirm which installation sequence is correct for the purpose of this tender?Your early response would be greatly appreciated as we are finalizing our bid.Answer to Question no# 19;Dear Bidder,Thank you for your inquiry. Please find below our response to your clarification request.Please refer to figure 2 in the 3rd tab “Typical works arrangement “ of the Form D spreadsheet, which shows the layout and relative sequencing of the strainer and the footvalve.We trust that the above clarifications address your queries.Kind regards,UNOPS Procurement Team

New clarification added: Question no # 18:Dear Sir/Madam,I hope this email finds you well.We are interested in establishing cooperation with your esteemed organization and would appreciate your assistance in clarifying the following points:There are several types of strainers available, such as Y-type strainers, T-type strainers, Basket strainers, Self-cleaning (Automatic) strainers, and Duplex strainers. Could you kindly confirm which specific type is required for this procurement? We would also appreciate it if you could share a reference image or specification for better understanding.It appears that LOT 2 and LOT 3 have identical specifications. Could you please clarify whether LOT 3 is a duplicate entry or if this is intentional?We would greatly appreciate your clarification on the above matters at your earliest convenience.Thank you in advance for your support.Response to Question no# 18 Dear Bidder,Thank you for your inquiry. Please find below our response to your clarification request:Suppliers are free to propose suitable strainers that are compatible with the installation arrangements reflected in the drawings provided and that meet the specified performance requirements. Due to the proprietary nature of the various strainer designs, images cannot be provided.Please note that Lot 3 differs from Lot 2 as follows:Lot 2: Strainers without a self-cleaning function.Lot 3: Self-cleaning strainers.We trust that the above clarification addresses your queries.Kind regards,UNOPS Procurement Team

New clarification added: Question No # 15Question: Respected Sir/Madam, Greetings, Thank you very much for your response regarding this bid.We noticed that the bid requires samples to be submitted after the bid submission. We also observed that installation at the project site is mentioned as part of the requirements.As we are submitting our bid from India in USD, we kindly request you to confirm whether both the submission of samples and on-site installation are mandatory requirements for this bid.We would appreciate your clarification so that we can prepare our bid accordingly.Thank you, and we look forward to your response.With warm regardsResponse to Question no# 15, 16 and 17:Dear Bidder,Thank you for your inquiry. Please find below our response to your clarification request.It is not required to submit samples at the time of bidding. Samples will be requested only of the recommended bidder as a pre-contracting quality check. The details is indicated in form C ( technical quotation form).We trust that the above clarifications address your queries.Kind regards,UNOPS Procurement Team 

New clarification added: Question #14;Question: Subject: RFQ/2026/63669 – Market Research Findings and Clarification Request for Lot 2 (Strainers)Dear UNOPS Procurement Team,Regarding Lot 2 (Strainers) of RFQ/2026/63669, we have conducted supplier communications and market research. We would like to share our findings with you and kindly request your confirmation on several key points.We are considering the stainless steel Y-type strainer as our proposed solution for Lot 2. This product meets your technical specifications in terms of filtration precision (1mm and 2mm), material (stainless steel 304/316), and flange standards (ASME Class 150 or EN PN16). As a static filtration device, it does not rely on fluid power to drive any rotating components, ensuring stable operation under all flow conditions. It offers flexible installation and easy maintenance.During our supplier communications and market research, we have identified the following facts:First, flow rate limitations of non-electric backwashing strainers. Some non-electric backwashing strainers, although classified as "strainers," rely on fluid power to drive internal rotating mechanisms for backwashing. When flow rates are low (such as DN125 at 35 m³/h and some DN200 at 66 m³/h in this project), the rotational speed is insufficient, resulting in poor backwashing performance and ineffective cleaning of the filter screen, which may eventually lead to clogging. Suppliers have clearly advised that the flow rates for the smaller diameters in this project are not adequate to support the normal operation of non-electric backwashing strainers.Second, the difference between submerged and land-based installation. Some non-electric filters designed for land-based (above-ground) installation are not affected by low flow rates, but they are not suitable for submerged operation. Since this project requires installation at the pump suction intake underwater, this further limits the available product options.Third, request for site flow data confirmation. Flow rate is the key parameter that determines our product selection. We kindly request your confirmation on whether the site flow rates are stable and what the actual operating flow values are. If the flow rates are indeed low, an electrically driven solution is a option that must be seriously considered from a technical reliability perspective.Based on the above findings, we respectfully request your confirmation on the following points:Is the Y-type strainer solution acceptable for Lot 2?Are the site flow rates stable, and what are the actual values?Is submerged installation mandatory, or would land-based installation be acceptable? If land-based installation is acceptable, we can further evaluate that option as well.Your confirmation on these points will directly affect our final product selection and bid proposal. We kindly request your clear response so that we can proceed with the next steps promptly.Thank you for your understanding and support.Response to Question no# 14Dear Bidder,Thank you for your inquiry. Please find below our response to your clarification request.Answer 1;UNOPS cannot advise on technologies to be supplied. The specifications require the strainer to operate under water and without power, and to be located on the intake pipe upstream of the footvalve. The supplier may propose a suitable device meeting these requirements.Answer 2 on backwashing strainers:The flows provided will be consistent after pump start up. During pump start-up the flow will increase from 0 to the specified flow. Where the product does perform with the given flow, suppliers should not propose the items.The strainers will be submerged and products proposed should be suitable to operate in fully submerged conditions.We trust that the above clarifications address your queries.Kind regards,UNOPS Procurement Team

New clarification added: Question no # 13;Subject: RFQ/2026/63669, Lots 2 & 3 – Proposed Solutions and Request for GuidanceDear UNOPS Procurement Team,Following our previous email outlining the technical challenges, we would now like to present our proposed solutions for your consideration.Solution 1: Flange Reducer + Flexible Hose Connection (Lots 2 & 3)We respectfully seek your confirmation on whether this connection solution is acceptable for both Lots 2 and 3. Should you approve this approach, we will ensure that the supplier provides full technical documentation, including material certifications, pressure and temperature ratings, service life data, and impact on head loss.Solution 2: Lot 3 – Self-Cleaning Strainers – Electric Drive SolutionFor Lot 3, we have identified a supplier capable of manufacturing electric brush-type self-cleaning strainers with the following key specifications:Filtration precision: 0.6mm to 2mm (covering 1mm and 2mm requirements)Body material: Stainless steel Flange standards: ASME B16.5 Class 150 or EN 1092-1 PN16Maximum working pressure: 1.6MPa Power supply: 220V or 380V (configurable to site conditions)While this product deviates from your original specification by requiring external power, it meets or exceeds your requirements in all other key aspects. Under current market conditions, this is the closest available alternative that meets your core performance requirements. We respectfully request your acceptance of this solution, subject to site power availability.We also welcome any recommendations from your side regarding suppliers that may offer fully non-electric solutions.Summary of Requests For both Lots 2 and 3, is the flange reducer + flexible hose connection solution acceptable?For Lot 3, can we proceed with the electric drive solution (220V or 380V, configurable to site conditions)?If you are aware of any suppliers offering fully non-electric products that cover all required specifications, we would appreciate your guidance.We remain fully committed to this procurement process. If needed, we can provide product brochures, technical data sheets, test reports, or arrange technical discussions.We kindly request your guidance so that we can finalize our offer and complete our bid submission in a timely manner.Thank you for your time and consideration. We look forward to your response.Yours sincerely,Answer to Question #  13;Dear Bidder,Thank you for your request for clarification.Response to Solution 1: UNOPS is not able to advise on proposed submission. Where additional components are required to connect the strainer to the footvalve flange, please ensure all items are included in your bid price and detailed in your technical submission. Please note that bids will be evaluated against UNOPS criteria including minimum UNOPS technical specifications listed in the tender document.Response to Solution 2: UNOPS is aware of products that meet the specification set by UNOPS. Bidders should note that they may bid for any of the lots and may opt not to submit for all lots. Where a bid for a lot is submitted, it is required to bid on all items under each lot.We trust that the above clarifications address your queries.Kind regards,UNOPS Procurement Team

New clarification added: Question no# 12Question: Email 1: Problems and ChallengesSubject: RFQ/2026/63669, Lots 2 & 3 – Technical Challenges and Market FindingsDear UNOPS Procurement Team,Regarding Lots 2 and 3 (Strainers and Self-cleaning Strainers) of RFQ/2026/63669, we have been actively seeking qualified products that meet your technical requirements. We would like to share our findings and challenges with you.1. Common Issue – Flange Connection and Installation AdaptionDuring our technical discussions with potential suppliers, we identified that a flange reducer and flexible hose connection would be required to adapt the product interface to the pipeline diameters specified in the project. The supplier‘s standard product interface does not directly match all the specified pipe diameters, and using a reducer with a flexible hose is their recommended method to ensure proper alignment and stress-free connection. Flexible hose connections are a common practice in filter installation.We have requested the supplier to provide detailed technical parameters, including reducer material, hose pressure and temperature ratings, service life, and the impact on overall head loss.2. Lot 3 – Self-Cleaning Strainers – Market Availability of Non-Electric Drive MechanismsFor Lot 3, we have conducted a more extensive market study due to the specific requirement that the self-cleaning activation mechanism shall not require electronic components or external power supply.Self-cleaning filter technologies in the Chinese market generally fall into three categories:Electric brush-type: Uses a motor and controller, requires 220V or 380V power. Mainstream product, mature technology, ample supply.Hydraulic-electric hybrid: Main drive is hydraulic, but controller and drain valve still require power or batteries. Not purely mechanical.Purely hydraulic: Requires no electricity, but needs a minimum flow rate of 70 m³/h to activate. Below this threshold, the mechanism cannot start properly.We verified the project flow rates and found that smaller diameters such as DN125 (35 m³/h) and some DN200 (66 m³/h) fall well below the 70 m³/h threshold. Even if some higher-flow specifications reach this threshold, the low-flow specifications remain unserviceable. Additionally, under fluctuating sediment conditions, the reliability of purely hydraulic solutions is difficult to guarantee.Based on the above, all products that can operate stably and effectively perform self-cleaning within the required flow range (35 to 122 m³/h) require electrical power. Despite extensive research, we have been unable to find a product that covers all specifications without any electrical power.We look forward to your guidance and will provide our proposed solutions in a separate email.Answer to Question No#13;Dear Bidder,Thank you for your request for clarification.A1. Where additional components are required to connect the strainer to the footvalve flange, please ensure all items are included in your bid price and detailed in your technical submission.A2. UNOPS is aware of products that meet the specification set by UNOPS. Bidders should note that they may bid for any of the lots and may opt not to submit for all lots. Where a bid for a lot is submitted, it is required to bid on all items under each Lot.We hope this clarification satisfies your request for clarification.Kind regards,UNOPS Procurement Team 

New clarification added: Question no# 11;Question: From the clarification Q & A, we can know that, no need the foot valve, just need the Strainer.Please check again, if this kind of strainer is needed? How do I send you the sample picture?Response No# 11;Thank you for your clarification request.We are unable to confirm or endorse the suitability of any specific product, including any particular type or model of strainer, prior to bid submission. Bidders are advised to carefully review the technical specifications, requirements, and clarifications provided in the tender documents and submit products that they consider fully compliant with the stated requirements.Please refer to the previous clarification responses and Form C (Technical Clarifications) for further guidance. Any product submitted should meet the required specifications and be subject to evaluation in accordance with the tender requirements.Note to all bidders:For further clarification regarding Question No. 07, please consider that the saddle’s connection is proposed by the bidder to align with the proposed ball valve and gauge assembly.The thread standard is to comply with ANSI/B1.20.1. The relevant specification under this code is NPT.Thank you,UNOPS - Procurement Team 

New clarification added: Question No#10:Dear UNOPS Procurement Team,Please ignore our previous inquiries and refer only to the questions below. These consolidated questions will help us better understand your product requirements so that we can offer you the most competitive price with the best quality products.We are preparing our quotation for the above-referenced tender and respectfully request clarification on the following technical matters. We would appreciate your guidance on each point to enable us to submit a fully compliant offer.Lot 1 – Pressure Gauges & SaddlesLot 1, Q1. Thread interface (Form C Sections 1.2 and 2.1): Does UNOPS have a preferred thread type (NPT, BSP, or metric) for the pressure gauge-to-ball valve and ball valve-to-saddle connections?Lot 1, Q2. HDPE saddle thread specification (Item 2.0 under Lot 1, Section 2.1): The tender documentation specifies that the saddle shall be supplied with a threaded outlet compatible with the ball valve. Could you please advise on the nominal thread size (e.g., G ½", G ¾", G 1", or other) and the thread standard (e.g., G/BSPP, NPT, or another standard)?Lot 2 – StrainersLot 2, Q3. Works layout dimensions (Form C Section 1.2): The "Typical Works Arrangement" drawings are schematic. Could you please provide specific dimensional constraints, including available length/width/height, minimum water cover requirement, center-to-center distance between adjacent intake pipes, and clearance between strainers? Drawings with detailed dimensions or site photos would be very helpful.Lot 2, Q4. Flange standard (Form C Section 1.4): Is EN 1092-1/2/3 PN16 mandatory, or are equivalent standards (e.g., ASME B16.5 Class 150) acceptable?Lot 2, Q5. Flow rate unit (Form C "Testing Requirements" tab): Is "cm/hr" intended to be "m³/hr"? Are the three flow rates to be applied to each sample or assigned separately?Lot 2, Q6. Post-production testing (Form B Section 3.2): Does "5 Unit tested" refer to 5 random samples or 5 specific diameters?Lot 2, Q7. Pre-award samples (Form C Section 4.2): Are the DN250 and DN300 samples required to be full-size operational units, or are scaled-down versions acceptable for initial validation?Lot 2, Q8. Alternative product: During our market research, we identified that certain manufacturers offer a silent check valve with an integral strainer as a potential alternative to the standalone strainer specified in Lot 2, providing additional backflow prevention and water hammer reduction benefits. Would such an alternative be acceptable under the tender requirements, or must the strainer be supplied strictly as a standalone item per the existing specification? Please note this is a value-added option we wish to present for your review, and we remain fully capable of quoting the original specification.Lot 3 – Self-cleaning StrainersLot 3, Q9. Foot valve type (Form B line items): Based on our technical review of the drawings, the item described as a "foot valve" appears to share characteristics with a silent check valve. Could you please confirm whether the intended product is a silent check valve or a conventional foot valve?Lot 3, Q10. Scope of supply (Form B line items): The line items are described as "Footvalve DN [size] – maximum flow [XX] m³/hr". Please confirm whether:Option A: Complete integrated unit (self-cleaning strainer + footvalve together); orOption B: Strainer unit only, with footvalve excluded from this RFQ.We ask because in previous UNOPS tenders, footvalves were sometimes procured separately.General Request (All Lots)All Lots, Q11. Reference photos: If available, could you please provide photos of similar projects or reference installations? This would greatly help us better understand the technical requirements and installation scenario.We would be grateful for your early response to these clarifications, as they will enable us to finalize our compliant offer and submit it before the deadline. Please let us know if you require any additional information from our side.Thank you for your assistance.Answer  No#10:Dear Bidder,Thank you for your inquiry. Please find our responses below:Lot 1 – Pressure Gauges & SaddlesA Q1 : Both NPT and BSP are acceptableA Q2 : Size: 1/4" , (Male NPT (National Pipe Taper) on the instrument side, mating with a corresponding Female NPT threaded brass or stainless steel insert molded into the HDPEelectrofusion branch saddle outlet )Lot 2 – StrainersA Q3: According to Footvalve DN, it will be different in length and diameter A Q4: the flange equivalent standards acceptable  A Q5: m3/hr for each sampleA Q6: 5 separate physical samples, not 5 diameters.A Q7: No, scaled-down versions are generally not acceptable. For pre-award operational validation of large-scale filtration and valve infrastructure, the DN250 and DN300 samples must be full-size, fully operational units.Q8: No, you cannot replace the stand-alone strainer with a combination valve/strainer in your initial bid. However, you can - and should - offer it as an alternative (type) alongside the original bid as per your requirements.A Q9: Footvalve is not part of this RFQA Q10:A: No,  just the self-cleaning strainerB: strainer unit onlyQ11: Unfortunately, the photos are not available Thank you for your request for clarification and for your interest in this procurement process. We appreciate the time and effort you have taken to review the bidding documents.We hope that the responses provided above  adequately address your inquiries and clarify the matters raised. We trust that these clarifications will assist you in the preparation of your bid.Should you require any further clarification, please do not hesitate to contact us in accordance with the procedures outlined in the bidding documents.Yours sincerely,UNOPS Procurement Team 

New clarification added: Question no # 07:Dear UNOPS Procurement Team,We trust this message finds you well.In the course of our technical review for Lot 1 of the above-referenced tender, we have noted a specification detail that we would kindly request your office to clarify in order to ensure full compliance and accurate pricing.Item in question: HDPE Electrofusion Saddle (Item 2 under Lot 1)Clarification sought:The tender documentation specifies that the HDPE electrofusion saddle shall be supplied with a threaded outlet compatible with the ball valve assembly connected to the pressure gauge. However, we were unable to locate a clear indication in the current documents regarding the internal thread size and standard of the saddle's female threaded connection.Could you please advise on the following:Nominal thread size – for example, G ½", G ¾", G 1", or other;Thread standard – whether it is G (BSPP) as commonly used in pressure gauge connections, or alternatively NPT, or another standard.Your confirmation on this point would enable us to select the correctly matched components and submit a fully compliant technical and commercial offer. We also note that this dimension is critical for ensuring proper field assembly between the saddle, ball valve, and pressure gauge.We appreciate your time and look forward to your kind response. Should you require any additional information from our side, please do not hesitate to let us know.Response # 07:Dear Bidder,Thank you for your inquiry. Please find our responses below:The saddle’s connection is proposed by the bidder to align with the proposed ball valve and gauge assembly.The thread standard is to comply with ANSI/B1.20.1. The relevant specification under this code is NPT. Question no#08;Dear Sir/Madam,We are preparing our quotation for Lot 3 and kindly seek clarification on the scope of supply.In Form B, the line items are described as "Footvalve DN [size] – maximum flow [XX] m³/hr". We would like to confirm whether:Option A: The scope includes a complete integrated unit (self-cleaning strainer + footvalve); orOption B: The scope includes the strainer unit only, with the footvalve excluded from this RFQ.We ask because in previous UNOPS tenders, footvalves were sometimes procured separately. We want to ensure we are pricing the correct scope.We would appreciate your guidance. Thank you.Response No# 08:Dear Bidder,Thank you for your inquiry. Please find our responses below:The foot valve is not included in this bid.The footvalve details are provided as the strainer will be required to connect to the footvalve.Question no# 09;Question: =CLARIFICATION 4 =Regarding Lot 2 standard strainers and Lot 3 self-cleaning strainers, we notice your sheet only contains data of connection size and flow rate.To work out the most accurate and optimal quotation for you, could you kindly provide the detailed working conditions including medium type, operating temperature, working pressure, required filtration rating and material requirements?Could you please provide photos of LOT2 & 3 so we can confirm the product?Answer no# 09;Dear Bidder,Thank you for your inquiry. Please find our responses below:Continuous filtration without interrupting pump operation.Minimize pressure drop across the suction line (maximum 0.5m).Prevent clogging and blockage during operation.Allow automatic debris removal through a self-cleaning mechanism without power requirements.Cleaning Method :Automatic/self-cleaningFiltration Size : 0.6 mm - 2mmRegards,UNOPS Procurement Team

New clarification added: Question no#04:Lots: 1, 2, and 3Dear Sir/Madam,We are preparing our quotation and respectfully request clarification on the following points:A. Lot 2 & 3 – Strainers and Self-cleaning Strainers (Form C Sections 1.2, 1.4, 4.2, 4.4 and "Testing Requirements" tab)Works layout dimensions (Section 1.2): The "Typical Works Arrangement" drawings are schematic. Could you please provide specific dimensional constraints, including available length/width/height, minimum water cover requirement, center-to-center distance between adjacent intake pipes, and clearance between strainers? Drawings with detailed dimensions or site photos would be very helpful.Flange standard (Section 1.4): Is EN 1092-1/2/3 PN16 mandatory, or are equivalent standards (e.g., ASME B16.5 Class 150) acceptable?Flow rate unit ("Testing Requirements" tab): Is "cm/hr" intended to be "m³/hr"? Are the three flow rates to be applied to each sample or assigned separately?Post-production testing (Form B Section 3.2): Does "5 Unit tested" refer to 5 random samples or 5 specific diameters?Pre-award samples (Section 4.2): Are the DN250 and DN300 samples required to be full-size operational units, or are scaled-down versions acceptable for initial validation?B. Lot 1 – Pressure Gauges & Saddles (Form C Sections 1.2, 2.1 and B.2)Thread interface (Sections 1.2 and 2.1): Does UNOPS have a preferred thread type (NPT, BSP, or metric) for the pressure gauge-to-ball valve and ball valve-to-saddle connections?Production capacity (Section B.2): Does the "guaranteed supply quantity within one month" refer to the total of all items combined or per specific diameter/SKU?C. Additional RequestReference photos: If available, could you please provide photos of similar projects or reference installations? This would greatly help us better understand the technical requirements and installation scenario.We would appreciate your guidance on the above. Thank you for your assistance.Response # 04:Dear Bidder,Thank you for your inquiry. Please find our responses below:A: Lot 2&3This information is to be provided with your tender to suit your product. Equivalent standards are acceptableCorrect, cm/hr is m3/hr. The three flows will be applied to each sample.We will use random sampling for post production testing but more likely to select higher diameter samples.Pre-award samples will only be requested from the preferred bidder. Full scale samples will be required to allow testing in the field.B: Lot 1There is no preference. Due to tight timelines we would require all items to be produced in one month.C. Unfortunately no photographs are available at this timeB. Lot1 -Both NPT and BSP are acceptable It is clear in Lot 1 Form C :Production and Supply Capacity: The bidder must state their maximum production/supply capacity per month for the offered goods, AND their guaranteed supply quantity that can be delivered within one month from the issuance of the instruction to commence manufacture.C. Additional Request: this the indicative of saddle connection Question no#05; Dear UNOPS Procurement Team,Thank you for the opportunity to participate in the tender for RFQ_2026_63669. We are currently preparing our quotation for Lots 2 and 3 and would appreciate your clarification on the following technical matters, which we have discussed with our potential suppliers.1. Clarification on the "Foot Valve" SpecificationBased on the technical drawings provided for Lots 2 and 3, our suppliers have reviewed the requirements and identified that the item described as a "foot valve" appears to be a silent check valve (also known as a non-slam check valve) with an integrated strainer function, rather than a traditional foot valve.We would kindly request your confirmation on whether the intended product is indeed a silent check valve, or if a conventional foot valve is specifically required. This distinction will materially affect the product selection and our final quotation.2. Supplier's Proposal to Substitute the Filter with a Silent Check ValveOne of our potential suppliers has indicated that for Lot 2, the specified filter could be substituted with a silent check valve (equipped with an integral strainer), which they believe would serve the same function while offering better performance in preventing backflow and reducing water hammer.We would like to seek your position on whether such a substitution would be acceptable under the tender requirements, or whether the filter must be supplied as a standalone item strictly per the existing specification.We would be grateful for your early response to these clarifications, as they will enable us to finalize our compliant offer and submit it before the deadline. Please let us know if you require any additional information from our side.Thank you for your attention to this matter.Response No #05:Dear Bidder,Thank you for your inquiry. Please find our responses below:The footvalve is not included in this bid. The foot valve information is provided to allow the bidder to ensure that the strainer provided under this tender can connect to the foot valve which will be upstream of the strainer.2. A silent check valve is not accepted as a substitutionQuestion no # 6: Question: CLARIFICATION 3Regarding LOT 2 & 3 Please send me the product photos so I can see which type of Strainer / self-cleaning strainers it is.The situation is as follows: I would like to see the product pictures. The item you inquired about is Strainer, but the details in the table are for a foot valve. So, should the Strainer be provided based on the size of the foot valve? Our Strainer has this appearance (in attached); please check if it is what you need. If not, please provide the appearance of the product you require.Response N0#06:Dear Bidder,Thank you for your inquiry. Please find our responses below:Photographs are not available. Strainers are not required according to appearance but according to the location of installation (at the pipe intake) and  the specified functionality of passing the required flow and preventing passing of the specified sediment size.The footvalve details are provided as the strainer will be required to connect to the footvalve.Thank you,UNOPS - Procurement Team 

New clarification added: Question No# 01;Dear UNOPS Procurement Team,After carefully reviewing the technical specifications for Lots 1, 2, and 3, we would appreciate your clarification on the following points to ensure that we submit a fully compliant offer.Lot 1 – Pressure GaugesPlease confirm whether each item shall be supplied as a complete pressure gauge assembly, including the pressure gauge, diaphragm seal, snubber, pressure limiting valve, and full-bore brass ball valve with stainless steel lever, or whether some of these components will be supplied separately.Kindly confirm the required pressure measuring range (Bar or kPa) for each pressure gauge.Please confirm the required process connection size and thread type (e.g. 1/2" BSP, NPT, etc.).Please confirm the required material for the pressure gauge case, wetted parts, and diaphragm seal (e.g. SS304 or SS316).The specification states PN16 up to 200 mm and PN10 for 200 mm and above, while the price schedule specifies a 200 mm saddle as PN16. Kindly confirm the required pressure rating for the 200 mm HDPE electrofusion saddle.Lot 2 – StrainersKindly confirm the maximum allowable head loss (pressure loss) at the specified flow rates.Please confirm whether the required flange drilling shall be ASME Class 150 or EN PN16, or whether both standards are acceptable.In the technical specification, some flow rates are shown as m/hr. Kindly confirm whether these should be interpreted as m³/hr.The testing requirements refer to DN140, DN200, and DN315 samples, while the price schedule does not include DN140 or DN315. Please clarify the required sample sizes.The specification refers to Stainless Steel Grade 304/304L and also EN 1.4305. Kindly confirm the required stainless steel grade.Please clarify whether bidders are required to nominate one accredited testing laboratory or three accredited laboratories.Lot 3 – Self-Cleaning StrainersKindly clarify the required self-cleaning mechanism (e.g. mechanical, hydraulic, automatic backwash, or another system).Please specify any requirements regarding the cleaning cycle, operating conditions, or performance criteria for the self-cleaning function.Please also confirm the same points listed under Items 6–11 above, where applicable to Lot 3.We would greatly appreciate your clarification, as it will help us obtain accurate quotations from manufacturers and submit a fully compliant proposal.Thank you for your assistance, and we look forward to your response.Response no#01:Dear Bidder,Thank you for your inquiry. Please find our responses below:LOT 1This is confirmed - the cost should cover all the required components Please refer to Form C item 1.1 which indicates “The following are to be included as required for effective operation: diaphragm seals, snubbers, and pressure limiting valves.”Further Form C item 1.2 indicates “Size 63mm complete set complying with ASME B40.100-2022, EN 837-1, En 837-3 or similar approved. Must include a Process Connection with thread per ANSI/B1.20.1. A full bore brass ball valve with stainless steel lever is to be included with the gauge.”Please refer to Form C item 1.3 which specifies the gauge range from 0 to 16 bar.Please refer to form C item 1.2: Must include a Process Connection with thread per ANSI/B1.20.1. Please note the connection must be suited to the saddle provided.Form C item 1.3 specifies this requirement as followsCasing protection standards IP65 of IEC 60529:2001 or similar approved for outdoor use in harsh environment (heat and cold)- Casing 304 or 316 Stainless Steel or chemical-resistant plastics such as Phenolic- Pressure Connections Material: Stainless steel 316.- Pointer Collet: Aluminium or brass Blade: Black aluminium- Geared Movement Material: Clockwork brass or stainless steel- Window Instrument glass or plexiglass. Laminate glass to ANSI/SAE Z26.1. Tempered glass shall comply with ASTM C1048 (heat treated) or ASTM C1422- Over Pressure Safety: 2,5 x full scale value not exceeding 40 bar.- Operating Temperature Ambient: -20°C to + 60°C - Glycerine filling of case- Colour Coding of dialForm C item 1.1 specifies “Gauges to be suited to use with pumped river water containing fine sediment”PN16 up to 225mm diameter and PN10 for 250mm to 355mm and above diameter, this means that if PN16 is not available for 250mm and above, we will use PN10. Otherwise, please keep PN16 for all sizesLOT 2The maximum allowable head loss is 1mBoth standards are acceptableCorrect, the flow rate should be m3/hrThe samples will be DN 125 and DN300Form C item 2.3 indicates the strainers and mesh are to be constructed of stainless steel Grade 304/304L or higher (Grade 316) SAE standard or equivalent (EN number: 1.4305, UNS: S30400, BS: 304S, etc)Please nominate 3 laboratoriesLOT 3The supplier may offer any self-cleaning mechanism. However, the self-cleaning activation mechanism should not require electronic components or power supply since the device will be submerged on occasion.The performance criteria for the self-cleaning mechanism are that the strainer allows passage of the flow specified in form B at all time between cleaning cyclesPlease refer to the responses in LOT 2Question no #02:Dear Team,Regarding Lot 1 HDPE Electrofusion Saddle, the size you specified is not complete. Example (For  63mm PN16 HDPE pipe)Please provide all sizes in the format below for example Nominal Size IPS:3” x 1-1/4”3” x 2”3” x 3” Response # 02:Dear Bidder,Thank you for your inquiry. Please find our responses below:The pipe diameters are provided in items 2.1 to 2.13. For example “63mm PN 16” is a saddle to fit a 63mm HDPE class PN16 pipe.The process connection is to suit your the proposed gauge and ball valve connection thread (please see item 1 requirement description).Question no#03:CLARIFICATION 2Regarding LOT 3 In your inquiry information given for foot valve no any other information related to strainer or automatic strainer.Do you mean foot valve with strainer (Normally foot valve come with strainer)?As per my understanding you are looking for a type of foot valve in which one valve strainer can allow to pass partcals of 1mm and another foot valve in which foot valve strainer allow particals of 2mm.Am I right?If you looking this one than reply me quoteIf you need something else than explain and give more information of strainer, like type of strainer, body material of strainer, pressure rating of strainer etc.Response # 03Dear Bidder,Thank you for your inquiry. Please find our responses below:The bid does not include the footvalves.This tender is therefore for specialized strainers suited to the silt fraction and flow requirements specified. The foot valve information is provided to allow the bidder to ensure that the strainer provided under this tender can connect to the foot valve which will be upstream of the strainer.Full information on the strainers is provided in Form C.Thank you,Procurement team - UNOPS