COOLING TOWER (CT1 AND CT2) SPECIFICATIONS. Description CT-1 CT-II Circulation rate 4000 M3/hr 6000 M3/hr Induced Draft Counter Flow

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1 ANNEXURE I COOLING TOWER (CT1 AND CT2) SPECIFICATIONS Description CT-1 CT-II Circulation rate 4000 M3/hr 6000 M3/hr Type Induced Draft Counter Flow Induced Draft Counter Flow Material of Fill PVC PVC Nos. of cells 3 3 Wet bulb temp. (design) 29 o C 29 o C Dry bulb temp. (Actual design) 40 o C 40 o C CW Supply Temp o C CW Return Temp o C Average CW (Del T) o C 6 6 Heat load (design ) Maximum (Operating) 36x10 6 Kcal/hr 24x10 6 Kcal/hr 60 x10 6 Kcal/hr 50 x10 6 Kcal/hr Side stream filter capacity 120 M 3 /hr 180 M 3 /hr Holdup volume 1200 M M 3 Blow Down Rate 18 (M3/Hr) 20 (M3/Hr) Evaporation rate 63 m3/hr 71 m3/hr Material of construction Pipes Coolers CS CS / SS/ Brass CS CS / SS / Brass Raw Water Source Make-up Water Make up water M3/ hr Gopi Krishna Sagar Dam Raw water treatment Plant M3/Hr

2 PRESENT COOLING WATER TREATMENT SPECIFICATION ANNEXURE-II Description of the Program Normal Values A) Limits(In cooling water) Specifications ph Cond- (Micron s/cm) 1500 Turbidity NTU 03 to 05 P-alk(as Ca Co3)- ppm 0 M-alk( as Ca Co3)- ppm TH( as Ca CO3) - ppm CaH( as Ca Co3)- ppm MgH( as Ca Co3)- ppm Chloride as CL- ppm Silica as Sio2- ppm 60 TDS- ppm 1000 Iron as Fe- ppm 0.3 Zinc as Zn- ppm Free Chlorine ppm Total Phosphate as PO4 ppm 7 to 8 Meta phosphate ppm Oil, ppm Nil B) Parameter Corrosion rate mpy Cycle of Concentration 6 Deposition negligible dp in Biofouling Monitor negligible TVC org/ml ORP (mv) SRB counts / 100 ml <100 C) Services Site Engineer Day to day Treatment supervision Engineer D) Monitoring Tools Availability a)corrosion Rack with lock and key b) Deposit Monitor (for both CT1 and CT2) c) Bio Fouling Monitor (for both CT1 and CT2) d) Ultrasonic Flow Meter e) ORP Meter f) Others Dosing Pumps g) Mirobiological testing h) Analysis AND Reagents i) Testing Procedure E)Chemical for Treatment Corrosion Inhibitor: Ortho & Meta Phosphate, Zinc Anti Scalant/Dispersant Bio Dispersant Non Oxidising Biocide 1 Quarternary Ammonium compound based biocide formulation containing minimum of 25% of active ingredients Non Oxidising Biocide 2 Carbanate / Isothiazolene / Bisphane based biocide formulation containing minimum of 25% of active ingredients Chlorine di oxide Biocides dozed every Fortnight( Biocides 1 and 2 are alternate) Sulphuric Acid ( Total for CT -1 & CT 2 ) 40 Ton / Annum (Max) Chlorine ( Total for CT -1 & CT 2 ) 24 Ton / Annum (Max) F) Stock of Chemicals at site 2 months

3 ANNEXURE III [SHEET 1 OF 2] DETAILS OF HEAT EXCHANGERS IN TR-11 S.NO. EQUIPMENT NO. EQUIPMENT NAME NO OF EXCHANGERS MATERIAL OF CONSTRUCTION SHELL 1 11-E-104 LPG CONDENSOR 2 C.S. C.S E-106 NGL COOLER 1 C.S. C.S E-112 RESIDUE GAS COMPRESSOR AFTER COOLER 1 C.S. With SS- DUPLEX 304L CLAD 4 11-E-107 REGENERATION GAS COOLER 1 C.S. With SS- DUPLEX 304L CLAD 5 11-E-108A LEAN GAS COMP. INTER COOLER 4 C.S. C.S E-108B LEAN GAS COMP. AFTER COOLER 2 C.S. C.S E-109 EXP. COMP. AFTER COOLER 1 C.S. C.S E-122 PROPANE COLUMN CONDENSOR 1 C.S. C.S E-125 PROPANE CONDENSOR 2 C.S. C.S E-151 LEF O/H First Stage Cooler 1 C.S. S.S E-154 LEF O/H Final Stage Cooler 1 C.S. S.S. 12 FRAME 3 GT LUBE OIL COOLER 2 C.S. Brass 13 LGC SEAL OIL COOLER 2 C.S. Brass 14 EXP. COMP. LUBE OIL COOLER 2 C.S. Brass 15 PRU GT LUBE OIL COOLER 2 C.S. Brass 16 RG COMP. LUBE OIL COOLER 2 C.S. Brass TUBE

4 ANNEXURE III [SHEET 2 OF 2] DETAILS OF HEAT EXCHANGERS IN TR-12 S.NO. EQUIPMENT NO. EQUIPMENT NAME NO OF EXCHANGERS MATERIAL OF CONSTRUCTION SHELL TUBE 1 12-E-104 LPG CONDENSOR 2 C.S. C.S E-106 NGL COOLER 1 C.S. C.S E-112 RESIDUE GAS COMPRESSOR AFTER COOLER 1 C.S. With SS- 304L CLAD DUPLEX 4 12-E-107 REGENERATION GAS COOLER 1 C.S. With SS- 304L CLAD DUPLEX 5 12-E-108A LEAN GAS COMP. INTER COOLER 4 C.S. C.S E-108B LEAN GAS COMP. AFTER COOLER 2 C.S. C.S E-109 EXP. COMP. AFTER COOLER 1 C.S. C.S E-122 PROPANE COLUMN CONDENSOR 1 C.S. C.S E-125 PROPANE CONDENSOR 2 C.S. C.S E-128 PENTANE CONDENSOR 1 C.S. C.S E-130 SBP COOLER 1 C.S. C.S E-151 LEF O/H First Stage Cooler 1 C.S. S.S E-154 LEF O/H Final Stage Cooler 1 C.S. S.S. 14 FRAME 3 GT LUBE OIL COOLER 2 C.S. Brass 15 LGC SEAL OIL COOLER 2 C.S. Brass 16 EXP. COMP. LUBE OIL COOLER 2 C.S. Brass 17 PRU GT LUBE OIL COOLER 2 C.S. Brass 18 RG COMP. LUBE OIL COOLER 2 C.S. Brass

5 ANNEXURE IV MAKEUP WATER CHARACTERISTICS Canal Water from Gopi Krishna Sagar Dam is treated in the Raw Water Treatment Plant and supplied to the Cooling Towers as Make-up water. The parameters of water used as makeup is as follows: Parameters Treated Water from RWTP PH Cond. (us/cm) Turb. (NTU) 1-2 P-alk (as CaCO3) NIL M-Alk (as (CaCO3) ppm TH as CaCO3 CaH as CaCO3 MgH as CaCO3 Chloride as Cl - Sulfate as SO4 Silica as SiO2 TDS Iron as Fe Free residual Chlorine Zinc as Zn (ppm) TVC (org/ml) SRB(counts / 100 ml) Temp ppm ppm ppm ppm ppm ppm ppm ppm ppm Nil Nil Nil o C

6 ANNEXURE-V COOLING WATER TREATMENT PROGRAM GUIDELINES Serial no. Chemical to be dosed Remarks 1 Corrosion inhibitor-i non chromate orthophosphate & zinc based Continuous 2 Scale polymeric dispersant Continuous 3 Bio dispersant Continuous 4 Chlorine di oxide (ClO2 generator to be supplied by vendor) Shock dose twice in a day for 1 hr Non-oxidizing biocide-i Quarternary Ammonium compound based biocide formulation containing minimum of 25% of active ingredients Non -oxidizing biocide -2 Carbanate / Isothiazolene / Bisphane based biocide formulation containing minimum of 25% of active ingredients Contingency chemicals based on oil ingress and hydrocarbon ingress Shock Shock Minimum for 03 days contingency 8 Chlorine To be supplied by GAIL 9 Sulphuric acid To be supplied by GAIL

7 ANNEXURE-VI CHLORINE DIOXIDE GENERATOR SPECIFICATIONS Serial No. Parameters Specifications Remarks 1 Material Of construction As per vendor specification 2 Operating pressure range As per vendor specification 3 Packed tower column Length as per system requirement 4 Packing in Column As per vendor specification 5 Rota meter flow Range As per vendor specification 6 Flow control FC Valve 7 Type of flow control valve As per vendor specification 8 Power supply V AC (50 Hz.) 9 Chemical to be used Sodium Chlorite(NaClO2) Min. 25 % NaClO2 10 Level of ClO2 In cooling water ppm Dozing schedule twice in a day for 1 hrs on shock dose basis 11 Conversion 95 % Chlorine di oxide generators Minimum requirement A. The System should be manually operated with constant flow controllers B. It should have standalone real time online Chlorine di- oxide monitoring system with PLC based controllers. C. Should maintain yield of 95%. D. Should be of reputed company make and skid mounted with integrated dosing pumps. E. Should have integrated safety systems like : Safe reaction chamber design so that no gas phase forms in the reactor Have trip interlock systems that shut down the generator in the event of loss of dilution water. Should have safety features keeping in view the explosive nature of chlorine di oxide. F. Should be able to use Chlorine gas as feed component. G. GAIL will provide only Chlorine gas, Water supply (3.0 to 3.5kg/cm2) and electrical power connection for the generator; all the other requirements needed for generators have to be supplied by vendor. H. Vendor s site representative will be responsible for the safe Operation and Maintenance of the generator. I. One set of operating manual of the Generator has to be provided to GAIL.

8 ANNEXURE VII RESUME OF KEY PERSONNEL (SITE ENGINEER) Bidder may provide a resume for each key person (Site Engineer) to be assigned to the Cooling water treatment contract (as per Clause j of SCC), containing at least the following information on each person. (Additional pages are to be attached and properly designated, if necessary). a) Name : b) Educational Qualifications : c) Present position in Bidders firm : d) Relevant Experience and Employment History :

9 COOLING WATER TREATMENT PROGRAM LIMITS FOR GUARANTEE CLAUSE ANNEXURE-VIII Description of the Program Program Limits A) Limits in Cooling Water Analysis ph Cond- (Micron s/cm) 3000 max. Turbidity NTU 15 max. M-alk( as Ca Co3)- ppm 200 Max. TH( as Ca CO3) - ppm CaH( as Ca Co3)- ppm MgH( as Ca Co3)- ppm Chloride as CL- ppm 300 max. TDS- ppm 2000 max. Iron as Fe- ppm 2 max. Zinc as Zn- ppm 2 max. Free Chlorine ppm Ortho Phosphate as PO4 ppm Meta Phosphate as PO4 ppm Chlorine di oxide ppm B) Parameter Corrosion rate < 2.0 mpy Cycle of Concentration (COC) > 4 Deposition (Deposit monitor) 15 mg/dm2 dp in Biofouling Monitor < 150 mm of Water Col TVC org/ml < SRB counts / 100 ml < 100 C) Day to day Supervision Treatment supervision Site Engineer D) Monitoring Tools Availability Corrosion Rack with lock and key Deposit Monitor (for both CT1 and CT2) Bio Fouling Monitor (for both CT1 and CT2) Ultrasonic Flow Meter ( For Quarterly monitoring) Online ORP Meter(For CT-1 & CT-2) Dosing Metering Pumps & Associated accessories Microbiological testing Analysis Reagents, test kits, portable ph and chlorine analyzers etc. Testing Procedure Test heat exchanger(two No's) Chlorine di oxide generator(for CT-1 & CT-2) Online chlorine di oxide analyser E) Chemical for Treatment Corrosion Inhibitor: Ortho Phosphate, Zinc Anti Scalant/Dispersant Bio Dispersant Non Oxidising Biocide 1 Quarternary Ammonium compound based biocide formulation containing minimum of 25% of active ingredients As per limits defined above Non Oxidising Biocide 2 Carbanate / Isothiazolene / Bisphane based biocide formulation containing minimum of 25% of active ingredients Biocides to be dozed every Fortnight(Biocides 1 and 2 alternatively) Chlorine di oxide Sulphuric Acid(Supplied by GAIL) (Total for both cooling towers) 40 Ton / annum (Max) Chlorine(Supplied by GAIL) (Total for both cooling towers ) 24 Ton / annum ( Max ) F) Stock of Chemicals to be maintained at site by vendor 2 months

10 ANNEXURE IX TENDERER S PAST EXPERIENCE PROFORMA For previous experience, supporting document against award of work i.e. copy of work order, value of work, detailed scope of work start date, completion date, schedule duration, actual duration etc. should be furnished. Bidder should given experience details for similar works executed during preceding five years. For furnishing data against more jobs bidder may take photocopy of this format and fill separately for additional jobs and enclose. (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) (k) (l) (m) (n) (o) Work Description : Ref. No. : Client Name : Name & Designation of Officer-In-Charge: Client Address : Phone No. : Fax No. : Scheduled Start Date : Scheduled Completion date: Actual Start Date : Actual Completion Date : Scheduled Duration : Actual Time Taken : Total Value of Work : Supervising Agency: (p) Copy of work order Furnished: : / No (q) Completion/ Performance Certificate Furnished : / No Place: Date: (Signature of Authorized Signatory) Name: Designation: Seal: