Return this cover sheet with your response

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)

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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.

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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 m3/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:

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Figure 1: COUNTER-CURRENT EXCHANGER

M o tiv e w a te r

Se p a ra to r

E je cto r

Ou tle t

R e g e n e ra tio nin le t

In le t

Ve n t

In e r t l a y e r

Ai r

Ai r

Sy p h o n p ip e

In le t : s e rv i cew a te r fo r

b a ckw a s h

o u tle t e ffl u e n t

E ffl u e n t

E ffl u e n t + a i r

H y d ra u l i c s e a l

M o ti v e w a te r+ Ai r

Intermediate

Collector with

Spray/Regen

Collector Nozzles

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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:

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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

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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 Design Specifications

Nominal Production Flow m3/hr 280

Resin Type - Dowex Marathon C H+

Resin Volume L 24200

Regeneration Concentration - H2SO4 @ 1-4%

Regeneration Flow

Number of collector candle

nozzles per vessel

- 160

Lateral Connection for New

Nozzles

Stainless Steel 316 2” BSP

Vessel Diameter mm 3200

Vessel Straight Height mm 6000

Temperature range in vessel °C 2-30

Table 3: Anion Vessel Design Specifications Units Design Specifications

Nominal Production Flow m3/hr 280

Resin Type - Amberlite IRA Cl-

Resin Volume L 18350

Regeneration Concentration - NaOH @ 2-4%

Regeneration Flow

Number of candle collector

nozzles per vessel

- 160

Lateral connection for new

nozzles

- 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.

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2.5.1 The spray/regen collector nozzles are exposed to the following cation regeneration steps:

Step No. 1: Periodic Backwash Description: Vessel rinsed with filtered water from through the nozzles.

(Inside to outside of nozzles) Duration: 3 min Temperature: 15-20°C Ejector Water Flow Rate: None Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: 130 m3/hr @ 400-500 kPa Sequence End Criteria: Timer Step No. 4: Drying of Resin Upper Layer Description: Water from vessel sucked out through the nozzles via the

hydraulic ejector system. (Outside to inside of nozzles) Duration: 15 min Temperature: 15-20°C Ejector Water Flow Rate: 30 m3/h @ 400-500 kPa Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: None Sequence End Criteria: Approximately 10 cm of dried resin Step No. 9-13: Fresh Sulphuric Acid, Multiple Concentrations Description: Counter current injection of fresh sulphuric acid which is then

sucked through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles)

Duration: 40-60 min Temperature: 15-25°C Ejector Water Flow Rate: 30 m3/h @ 400-500 kPa Dilution Water Flow Rate: 30 m3/h @ ~500 kPa Reagent Flow Rate: 440-1240 L/h Reagent Concentration: 1.2-3.3% or 57-150 µS/cm Filling Water Flow Rate: None Sequence End Criteria: Timer Step No. 14: Sulphuric Acid Displacement Description: Remaining sulphuric acid in vessel and regen piping is sucked

through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles)

Duration: 45 min Temperature: 15-20°C Ejector Water Flow Rate: 30 m3/h @ 400-500 kPa Dilution Water Flow Rate: 30 m3/h @ ~500 kPa Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: None Sequence End Criteria: Conductivity below 250 µS/cm

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Step No. 15: Resin Upper Layer Cleaning Description: Filling of the cation exchanger via the effluent outlet piping.

(Inside to outside of nozzles) Duration: 13 min Temperature: 15-20°C Ejector Water Flow Rate: None Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: 160 m3/hr @ 400-500 kPa Sequence End Criteria: Exchanger almost full (water level above upper sight glass) Step No. 16: Filling of Cation Exchanger Description: Filling of the top part of cation exchanger via the effluent outlet

piping. (Inside to outside of nozzles) Duration: 2 min Temperature: 15-20°C Ejector Water Flow Rate: None Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: 160 m3/hr @ 400-500 kPa Sequence End Criteria: Exchanger full

2.5.2 The spray/regen collector nozzles are exposed to the following anion regeneration steps:

Step No. 1: Periodic Backwash Description: Vessel rinsed with demin water from demin range through the

nozzles. (Inside to outside of nozzles) Duration: 3 min Temperature: 15-20°C Ejector Water Flow Rate: None Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: 30-50 m3/hr @ 600-800 kPa Sequence End Criteria: Timer Step No. 5: Drying of Resin Upper Layer Description: Water from vessel sucked out through the nozzles via the

hydraulic ejector system. (Outside to inside of nozzles) Duration: 15 min Temperature: 15-20°C Ejector Water Flow Rate: 30 m3/h @ 400-500 kPa Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: None Sequence End Criteria: Approximately 10 cm of dried resin

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Step No. 9: Fresh Caustic Only Description: Counter current injection of fresh caustic soda which is then

sucked through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles)

Duration: 40 min Temperature: 30-40°C Ejector Water Flow Rate: 30 m3/h @ 400-500 kPa Dilution Water Flow Rate: 38 m3/h @ ~500 kPa Reagent Flow Rate: 1410 L/h Reagent Concentration: 30 g/L (3%) or 148 µS/cm Filling Water Flow Rate: None Sequence End Criteria: Timer Step No. 10: Caustic Soda Displacement Description: Remaining fresh caustic soda in vessel and regen piping is

sucked through the nozzles via the hydraulic ejector system. (Outside to inside of nozzles)

Duration: 60 min Temperature: 30-40°C Ejector Water Flow Rate: 30 m3/h @ 400-500 kPa Dilution Water Flow Rate: 38 m3/h @ ~500 kPa Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: None Sequence End Criteria: Alkalinity below 5 meq/l Step No. 11: Resin Upper Layer Cleaning Description: Filling of the anion exchanger via the effluent outlet piping.

(Inside to outside of nozzles) Duration: 5 min Temperature: 15-20°C Ejector Water Flow Rate: None Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: 30-50 m3/hr @ 600-800 kPa Sequence End Criteria: Exchanger almost full (water level above upper sight glass) Step No. 12: Filling of Anion Exchanger Description: Filling of the top part of anion exchanger via the effluent outlet

piping. (Inside to outside of nozzles) Duration: 1 min Temperature: 15-20°C Ejector Water Flow Rate: None Dilution Water Flow Rate: None Reagent Flow Rate: None Reagent Concentration: None Filling Water Flow Rate: 30-50 m3/hr @ 600-800 kPa Sequence End Criteria: Exchanger full

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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:

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1 x “Original RFI”

1 x “Copy RFI1”

1 x “Original RFI - electronic copy”

2.7.3 Important Notes

(i) 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.

(ii) 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.

(iii) 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.

(iv) 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.

(v) 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.

(vi) 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.

(vii) 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.

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(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