REQUEST FOR INFORMATION (RFI) Interested parties are invited to participate in an RFI process for the purposes of providing information on the Supply and Specifications of Alternative Demineralised Vessel Spray/Regen Collector Nozzles for Resin Regeneration at Majuba Power Station RFI reference number: MPGXC004652 Deadline for submission: 10h00 on 14 June 2017 (South African Standard Time) Return this cover sheet with your response
To: Water Treatment Plant Equipment Suppliers Date: 18 May 2017 Enquiries: 017 799 3505 Ref: MPGXC004652 REQUEST FOR INFORMATION (RFI) ON THE Supply and Specifications of Alternative Demineralised Vessel Spray/Regen Collector Nozzles for Resin Regeneration at Majuba Power Station Eskom Holdings SOC Limited ( Eskom ) invites you to submit information regarding the supply and specifications of alternative demineralised vessel spray/regen collector nozzles for resin regeneration at Majuba Power Station. Eskom would like to analyse the nozzle market s capability in manufacturing and supplying the nozzles that are due for an upgrade in the cation and anion vessels at Majuba Power Station. The following information is required for Eskom to assess credible suppliers: 1 INTRODUCTION Majuba Power Station is situated between Volksrust and Amersfoort in the Mpumalanga, South Africa. Demineralised water at Majuba Power Station is produced using ion exchange technology. The water treatment plant is designed to operate with three demin trains, each consisting of a cation exchanger and anion exchanger, vacuum degasser, atmospheric degasser, and a mixed bed exchanger. The cation and anion exchangers are each equipped with 160 spray/regen collector nozzles on their intermediate collectors that are used during the backwashing and reagent injection stages of the resin regeneration sequences. Therefore, 960 spray/regen collector nozzles in total. These nozzles are due for replacement with nozzles that will provide improved temperature, pressure and chemical resistance. The original nozzles are now obsolete, and a suitable replacement is required. 2
2 BACKGROUND 2.1 OBJECTIVE The main aim of this Request for Information (RFI) is to determine whether there are suppliers/contractors in the market that are capable of supplying alternative spray/regen collector nozzles with similar dimensions to the existing nozzles used at Majuba Power Station Water Treatment Plant but with improved temperature, pressure and chemical resistance. Furthermore, the RFI seeks to determine the capital cost, operating specifications and supply lag time that would be associated with new nozzles. 2.2 SCOPE The requirements of the RFI for the new spray/regen collector nozzles are as follows: 1) The new nozzles to be supplied will be installed on the intermediate collector of each of the anion and cation vessels. The intermediate collectors are indicated on Figure 1 in section 2.3. 2) The new nozzles must ensure that the regeneration of the cation and anion resin must be as per design specifications. The regeneration information is provided in section 2.5. 3) Information of the mass and dimension of the new nozzles must be included. 4) Information of the proposed material of construction and operating conditions of the new nozzles must be included. (Possible alternatives include a stainless steel 316 wedge wire type nozzle). 5) Supply details such as minimum quantity to be ordered, time lines for manufacturing and supply, etc. must be indicated. 6) A budget capital cost for supply and delivery of the new nozzles must be included. 7) Information on challenges or risks in providing the new nozzles, if any, must be indicated. 8) Indicate if the supplier is available to perform the installation of the nozzles. Cost to be included in budget cost. 9) Indicate any exclusion from Contractor s supply. 2.3 Ion Exchange Vessel Specifications Each of the demineralised water trains produces up to 280 m 3 /hr of demineralised water. The anion and cation vessel is regenerated counter-currently. The cation resin used is Dowex Marathon C (H + ) and the anion resin is Amberlite IRA (Cl - ). The average size of the resin is 0.550-0.650 mm A sketch of the Demin Ion Exchange Vessels is provided below: 3
Figure 1: COUNTER-CURRENT EXCHANGER Ve n t Ai r M o ti v e w a te r Eje cto r In l e t Ai r Effl u e n t + a i r M o ti v e w a te r + Ai r Se p a ra to r In e rt l a y e r Intermediate Collector with Spray/Regen Collector Nozzles Effl u e n t R e g e n e ra ti o n i n l e t Sy p h o n p i p e H y d ra u l i c s e a l In l e t : s e rv i ce w a te r fo r b a ckw a s h o u tl e t e ffl u e n t Ou tl e t 4
2.4 Existing Nozzle The nozzle comprises of 4 parts: a blue outside mesh, bottom threshed connector, internal collector with a top torpedo shape to hold the mesh. Drawings of these nozzles are included in the RFI package 0.66/99343 Sheets 1 and 2. Photos of the existing spray/regen collector nozzles: 5
Table 1: Existing Spray/Regen Collector Nozzle Specification Units Existing Nozzle Material - Polymer/Plastic Exact Material Not Known Outside Mesh Length mm 131 Outside Mesh Diameter mm 64 Outside Slits Total - 28 rows of 3 Outside Mesh Slit Width mm 0.3 Outside Slit Length 75 of total circumference equally spaced. Inside Slit Width mm 0.7 Inside Slit Length mm 30 Inside Slits Total - 2 Weight g 570 Operating Temperature C 30-50 Threaded Adapter mm ID: 40 OD:74 Outer Nozzle Diameter mm 70 Outer Nozzle Total Length mm 259 6
Sample nozzles can be obtained from Majuba Power Station Site Engineering. The intermediate collector laterals holding the Nozzles are made from stainless steel 316. Table 2: Cation Vessel Design Specifications Units Nominal Production Flow m 3 /hr 280 Design Specifications Resin Type - Dowex Marathon C H + Resin Volume L 24200 Regeneration Concentration - H2SO4 @ 1-4% Regeneration Flow Number of collector candle nozzles per vessel Lateral Connection for New Nozzles - 160 Vessel Diameter mm 3200 Vessel Straight Height mm 6000 Temperature range in vessel C 2-30 Stainless Steel 316 2 BSP Table 3: Anion Vessel Design Specifications Units Nominal Production Flow m 3 /hr 280 Design Specifications Resin Type - Amberlite IRA Cl - Resin Volume L 18350 Regeneration Concentration - NaOH @ 2-4% Regeneration Flow Number of candle collector nozzles per vessel Lateral connection for new nozzles - 160 - Stainless Steel 316 2 BSP Vessel Diameter mm 3200 Vessel Straight Height mm 5200 Temperature range in vessel C 2-50 2.5 Resin Regeneration The main purpose of the spray/regen collector nozzles is to collect the spent regenerate chemicals during counter current regeneration of the resin. The efficiency is improved by applying a suction pressure on the intermediate collector laterals. Also the nozzles must be resistant to corrosive chemicals. The replacement nozzles must be able to withstand the operating conditions described below. 7
2.5.1 The spray/regen collector nozzles are exposed to the following cation regeneration steps: Step No. 1: Periodic Backwash Vessel rinsed with filtered water from through the nozzles. (Inside to outside of nozzles) 3 min 130 m3/hr @ 400-500 kpa Timer Step No. 4: Drying of Resin Upper Layer Water from vessel sucked out through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles) 15 min 30 m3/h @ 400-500 kpa Approximately 10 cm of dried resin Step No. 9-13: Fresh Sulphuric Acid, Multiple Concentrations Counter current injection of fresh sulphuric acid which is then sucked through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles) 40-60 min 15-25 C 30 m3/h @ 400-500 kpa 30 m3/h @ ~500 kpa 440-1240 L/h 1.2-3.3% or 57-150 µs/cm Timer Step No. 14: Sulphuric Acid Displacement Remaining sulphuric acid in vessel and regen piping is sucked through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles) 45 min 30 m3/h @ 400-500 kpa 30 m3/h @ ~500 kpa Conductivity below 250 µs/cm 8
Step No. 15: Resin Upper Layer Cleaning Filling of the cation exchanger via the effluent outlet piping. (Inside to outside of nozzles) 13 min 160 m3/hr @ 400-500 kpa Exchanger almost full (water level above upper sight glass) Step No. 16: Filling of Cation Exchanger Filling of the top part of cation exchanger via the effluent outlet piping. (Inside to outside of nozzles) 2 min 160 m3/hr @ 400-500 kpa Exchanger full 2.5.2 The spray/regen collector nozzles are exposed to the following anion regeneration steps: Step No. 1: Periodic Backwash Vessel rinsed with demin water from demin range through the nozzles. (Inside to outside of nozzles) 3 min 30-50 m3/hr @ 600-800 kpa Timer Step No. 5: Drying of Resin Upper Layer Water from vessel sucked out through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles) 15 min 30 m3/h @ 400-500 kpa Approximately 10 cm of dried resin 9
Step No. 9: Fresh Caustic Only Counter current injection of fresh caustic soda which is then sucked through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles) 40 min 30-40 C 30 m3/h @ 400-500 kpa 38 m3/h @ ~500 kpa 1410 L/h 30 g/l (3%) or 148 µs/cm Timer Step No. 10: Caustic Soda Displacement Remaining fresh caustic soda in vessel and regen piping is sucked through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles) 60 min 30-40 C 30 m3/h @ 400-500 kpa 38 m3/h @ ~500 kpa Alkalinity below 5 meq/l Step No. 11: Resin Upper Layer Cleaning Filling of the anion exchanger via the effluent outlet piping. (Inside to outside of nozzles) 5 min 30-50 m3/hr @ 600-800 kpa Exchanger almost full (water level above upper sight glass) Step No. 12: Filling of Anion Exchanger Filling of the top part of anion exchanger via the effluent outlet piping. (Inside to outside of nozzles) 1 min 30-50 m3/hr @ 600-800 kpa Exchanger full 10
2.6 RFI RETURNABLES The RFI returnable shall include as a minimum Specification for new nozzles (material of construction, size, weight, pressure and temperature ranges, operating limitations) Estimated lead time for the delivery of the new Nozzles, and The estimated cost for purchase. Eskom has delegated the responsibility for this Request for Information (RFI) enquiry to Madelaine Prinsloo. All queries and official responses must be addressed to Madelaine Prinsloo. Please email me on: PrinslMA@eskom.co.za. 2.7 SUBMISSION INFORMATION To ensure the receipt of communication with regard to this Request for Information process, kindly complete Appendix A - Acknowledgement form. 2.7.1 Method of Delivery RFI submissions must be sealed and delivered at the tender box located at the following address: Eskom Tender Box Ground Floor No. 10 Smuts Avenue Witbank/Emalahleni Mpumalanga All RFI responses must be clearly marked as follows: Ref number: MPGXC004652 Closing date: 14 June 2017 Closing time: 10h00 Respondent s return address on a label outside the submission 2.7.2 Format of submission Each RFI response shall be supplied in printed and electronic format. Appendix 1 must be completed and attached to the RFI response. All printed and electronic copies of each submission shall be identical to the original submission identified as follows: 11
1 x Original RFI 1 x Copy RFI1 1 x Original RFI - electronic copy 2.7.3 Important Notes (i) (ii) (iii) (iv) (v) (vi) (vii) Due to the specific need that this RFI process has to fulfil, Eskom wishes to clarify that this request is not intended to impede, amend or replace any current or future procurement process that Eskom has engaged in or will engage in. Eskom reserves the right, in its absolute discretion, at any stage and without notice, to terminate further participation in the process by any Party, to select or disqualify any interested participant from further engagement, to amend and/or terminate this RFI process or any future process pursuant to this process. This RFI is a stand-alone information-gathering and market-testing exercise, intended only to inform and assist Eskom in an investigation currently being carried out for an existing project. All respondents, participates herein on the basis that it is providing information voluntarily to strengthen a potentially beneficial process for all stakeholders. Any and/or all information submitted by any and/or all respondents may be used in the development of this intended solution, without the necessity of acknowledging the source, and without such entity gaining any rights in respect of such a solution, including but not limited to any intellectual property rights. No portion of any of the information submitted will be treated as confidential and respondents should NOT submit sensitive or confidential, market or commercial information. The intention is to gather broad and general information to inform the way forward on more concrete processes. Any information provided pursuant to this RFI process and any subsequent processes and/or engagement is not confidential but Eskom will use the information only in the course of its process of carrying out an investigation for an existing project. Through making a submission a respondent accept the terms and conditions which governs this process. If any clarification is required on the information submitted by the respondent, all clarification answers and comments will be published on the Eskom web-site. 12
(viii) All participants responding to this RFI process need to ensure that they have received all information and remain solely responsible for satisfying themselves as to the information required in responding hereto and are fully responsible for all costs incurred in relation hereto and under no circumstances will any resultant cost be borne by Eskom. We look forward to receipt of your response. Yours faithfully, CW Bezuidenhout PROCUREMENT MANAGER 13