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BHARAT HEAVY ELECTRICALS LIMITED Tiruchirappalli - 620 014
NTPC – KORBA STPP - STAGE III (1X500 MW UNIT - 7) CUSTOMER NO: 0634 PAINTING SCHEME
NTPC DRG.NO. 2140-108-01-TR-PVM-W-001,
BHEL DRG.NO. TP-DC-249-504-0001
Prepared by M. Somu Manager / P.Lab
Document No: Q: PL: C3 - PS / 0634
Reviewed by R. Sundararaman DM / PE / FB
Revision No: 01 Dated: 09.08.2006
Approved by R.Easwaran SDGM / Plant Lab
Sheet No. : 1 of 11
m:\ chem \ contracts 06/korba01.doc
NTPC
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PE-Civil reviewed Item at Sl. No. 3 & 8 only. Comments mkd on the document.
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Approved in Cat-II
RECORD OF REVISIONS Rev. No Date Details of revision Remarks 00 01
03.07.2006 09.08.2006
New 1) Addition of PGMAs 48-667,11-378,30-220,235&48-665,and 31-010 under sl.nos.4,5,6 and 7 respectively. 2) Addition of notes 14 and 15 Notes
In line with kahalgaon stage II Phase II Vide customers letter CC:PEK:2140:108102:01:62 dt 28/07/2006
Inorganic Ethyl Zinc Silicate Primer DFT=75µm per coat
1 Epoxy BasedTio2 Pigmented Intermediate Coat DFT=75µm per coat
1 #Epoxy FinishCoat, DFT=35µm per coat + #Ali.Acrylic PU Paint DFT=30µm per coat
2 1
Grey Shade To RAL 9002
250
# Out of 2 coats of Epoxy based finish paint, one coat of Epoxy finish paint shall be given at shop / subcontracting works and second coat of Epoxy finish and one coat of aliphatic Polyurethane paint shall be applied at site.
Inorganic Ethyl Zinc Silicate Primer DFT=75µm per coat
1 Epoxy Based Tio2 Pigmented Intermediate Coat DFT=75µm per coat
1 #Epoxy FinishCoat, DFT=35µm per coat + #Ali.Acrylic PU Paint DFT=30µm per coat
2 1
Grey Shade To RAL 9002
250
# Out of 2 coats of Epoxy based finish paint, one coat of Epoxy finish paint shall be given at shop / subcontracting works and second coat of Epoxy finish and one coat of aliphatic Polyurethane paint shall be applied at site.
Q: PL: C3-PS / 0634 / 01 Sheet 4 of 11
Primer coat
Intermediate coat
Finish coat
Sl.No.
PGMA / Description Surface
Prepn &- Surface Profile Paint No. of
coats Paint No. of
coats Paint No. of
coats Shade
Total DFT µm
(min)
4
Components >95° C Insulated/Uninsulated other than components in Column 5 &7 Ring Headers,Down Comers,Hot air Headers outside the gas path etc. 18-002,003,010,020 21-600, 24-300,301,315,320,325,335,340,374,24-375 30-103,105,211,212,215,219 31-102,104,105 48-032 132,205,207,209,212,222,223,225 48-232,235,380,382,385,386,388,403 48-410,412,415,423,432,433,435,438,48-439,460,462, 465,466,468,480,482,48-485,490,492,495,660,662,663.,667
NOTES: 1.Rust Preventive Coating should be given on HSFG Bolt and nut threads. 2. Machined surfaces are to be applied with a coating of Temporary Rust Preventive oil. 3. All threaded and other surfaces of foundation bolts and its materials, insulation pins, Anchor channels, Sleeves shall be coated with Temporary Rust Preventive Fluid and during execution of civil works; the dried film of coating shall be removed using organic solvents. 4. Ground shade/colourof Finish paints & identification tag/Band for equipments,pipings pipe service,boiler supporting structures and other boiler components shall be followed as per NTPC doc. No.QS-01-DIV-W-4 (Rev. 1) which is available with BHEL. 5. PGMAs under Sub-Vendor items are not indicated. Please refer respective Engg. Document. 6. These Painting Schemes are valid for only Customer No: 0634 of NTPC Korba stage 3 unit 7 07. No painting is required for Stainless Steel components. 08. Wherever inside surfaces of components under PGMA 48 – XXX, need protection till erection, two coats of Red-oxide zinc phosphate primer paint to IS12744 to a DFT of 60 microns shall be applied, after power tool cleaning. 09. The Temporary Rust Preventive coating that already been applied on any components, tubes, pipes etc., shall be removed by suitable solvents / heating to 350 –400 °C for an hour before primer paint application –but, in this case, it should be ensured that the minimum surface cleanliness required for primer paint application shall be SSPC – SP2 (equivalent – Hand Tool cleaning). 10. In components, wherever plates / sheets of thickness less than or equal to 5 mm and rods are used, power tool / hand tool cleaning to SSPC – SP3 / SP2 shall be followed and the painting shall be done as described in Scheme No: 06. 11. For all commissioning components-erection materials (xx-993) one coat of Red oxide Zinc Phosphate Primer shall be applied to meet the temporary protection till erection, after power tool cleaning. 12.Touch-up painting of damaged areas shall be carried out as per clause 4.01.04,Part B.Sub section V of the NTPC Technical Specification. 13.All components covered under different PGMA’s are to be painted In case any component is left out ,the same shall be deemed to be included under the relevant section. 14. For very small components like clamps etc. Scheme No. 6 shall be followed 15.For very small components with weldable primer at edges, the entire component be applied with weldable primer.
Q: PL: C3-PS / 0634 / 01 Sheet 10 of 11
Painting Scheme – Details for procurement & application purposes Sl.No. Generic nature of paint Theoretical
5 Heat resistant aluminimum paint to IS 13183 Grade I 10 1 - - -- -- Brush / Spray
24
6 Red oxide zinc phosphate primer paint to IS 12744 10 1 -- -- - -- Brush / Spray
12
7 Red oxide Zinc Phosphate Dip coat primer paint to PR: CHEM: 09-03
10 1 -- -- -- --- Dip 12
8 Long oil alkyd synthetic enamel finish paint to IS2932 10 1 -- -- Reqd. shade
Corrpdg. Shade no.
Brush / Spray
12
9 Temporary Rust preventive fluid to PR: CHE: 09 – 04 10 1 -- -- -- -- -- 12 10 Epoxy Zinc rich primer to IS14589 Gr.II 8 2 35 40 Grey -- Spray 24 11 General purpose Aluminium paint to IS 2339 10 2 -- 20 Aluminum -- Brush 12## Brush painting is accepted, if recommended by the Paint suppliers. The covering capacity of paints specified is only approximate. The paints and Rust Preventive fluid shall be procured from BHEL’s approved suppliers. ** Values are indicative.
Q: PL: C3-PS / 0634 / 01 Sheet 11 of 11
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Painting of Damaged Areas (Areas where the paint has deteriorated badly by erosion and areas where the paint film has lost its adhesion and where the steel has rusted appreciably, should be repainted as follows)
Primer coat
Intermediate coat
Finish coat
Sl.No.
Components Surface Prepa- ration
Paint No. ofcoats
Paint No. ofcoats
Paint No. ofcoats
Shade
Total DFT µm
(min)
1 Paint damaged components fall under Sl.no: 3
Power tool cleaning to bare metal
One coat of Epoxy zinc rich
primer to IS 14589 Grade II to a DFT of 40
microns
1 As given in scheme
1 As given in scheme
3 As given in scheme
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2 Paint damaged components fall under Sl.no: 10
Power tool cleaning to bare metal
One coat of Epoxy zinc rich
primer to IS 14589 Grade II to a DFT of 40
microns
1 -- -- As given in scheme
1 As given in scheme
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3 Paint damaged components fall under Sl.no: 1,2,4,5,6,7,9.