Compositional Analysis of Compositional Analysis of Soluble Salts - PowerPoint PPT Presentation

ISST- -2007 2007 ISST Compositional Analysis of Compositional Analysis of Soluble Salts in Bresle Bresle Extraction Extraction Soluble Salts in from Blocks in Newbuilding Newbuilding Shipyards Shipyards from Blocks in S.S. Seo Seo, S.M. Son, C.H. Lee and K.K. Baek , S.M. Son, C.H. Lee and K.K. Baek S.S. Hyundai Heavy Industries Co., Ltd. Hyundai Heavy Industries Co., Ltd.

IMO’ ’s PSPC s PSPC IMO 2 2 Water Ballast TK Water Ballast TK Epoxy HB (160 µ m) Epoxy HB (160 µ m) Epoxy HB (160 µ m) Epoxy HB (160 µ m) Performance erformance S Standard tandard P I.O.Z. (15 µ m) I.O.Z. (15 µ m) For P Protective rotective C Coating oating For Steel Steel

IMO’ ’s PSPC s PSPC IMO 3 3 Corrosion Control Corrosion Control of Water Ballast TK: of Water Ballast TK: � Steel Thickness Steel Thickness � � Protective Coating Protective Coating � � Sacrificial Anode Sacrificial Anode � � Maintenance Maintenance �

IMO’ ’s PSPC s PSPC IMO 4 4 ITEM P S P C ITEM P S P C D.F.T. 2- -Coats, 320 Coats, 320 µ m NDFT(90/10) D.F.T. 2 µ m NDFT(90/10) D.F.T. Measurement Annex 3, Avg. 3~4 points/10 m 2 D.F.T. Measurement Annex 3, Avg. 3~4 points/10 m 2 nd Surface 1 st 1 st , 2 , 2 nd Surface Sa 2.5 Blasting, Profile: 30~75 µ m Sa 2.5 Blasting, Profile: 30~75 µ m Treatment Treatment Erection Joint Welds, Damaged Area <2%: St 3(Grinding) Erection Joint Welds, Damaged Area <2%: St 3(Grinding) Edge Preparation 2R, or 3- -Pass or at least equiv. Pass or at least equiv. Edge Preparation 2R, or 3 Edge Stripe Coating Min. 2 S/C; proven weld seams 1 S/C Edge Stripe Coating Min. 2 S/C; proven weld seams 1 S/C (S/C) Brush, Roller (Specified area only) (S/C) Brush, Roller (Specified area only) Size [5],[4],[3]: remove to Rating [1] Size [5],[4],[3]: remove to Rating [1] Dust Dust Size [2],[1],[0]: remove if visible on steel remove if visible on steel Size [2],[1],[0]: Soluble Salt <50 mg/m 2 NaCl, Bresle Bresle, Min. , Min. 1 Point/Block 1 Point/Block Soluble Salt <50 mg/m 2 NaCl,

IMO’ ’s PSPC s PSPC IMO 5 5 4.4 Basic coating requirements 4.4 Basic coating requirements Table 1 - - 3.1 Secondary surface preparation 3.1 Secondary surface preparation Table 1 Water soluble salts limit equivalent to NaCl after Water soluble salts limit equivalent to NaCl after 2 of blasting/grinding shall be ≤ ≤ 50 mg/m 50 mg/m 2 of blasting/grinding shall be sodium chloride (NaCl). sodium chloride (NaCl). Conductivity measured in accordance with Conductivity measured in accordance with ISO 8502- -9:1998. 9:1998. ISO 8502

Salt induced Blistering Salt induced Blistering 6 6 Osmotic Blistering Osmotic Blistering 10mm 10mm

Bresle Method Method 7 7 Bresle Conductivity Meter Conductivity Meter Test Patches Test Patches Measurement Beaker Measurement Beaker Pure water Pure water Syringes and Needles Syringes and Needles Sponges to wipe excess liquid Sponges to wipe excess liquid ISO 8502- -6: Salt Extraction 6: Salt Extraction ISO 8502 (Bresle Bresle Method) Method) ( ISO 8502- ISO 8502 -9: Salt Measurement via 9: Salt Measurement via Electrical Conductivity Electrical Conductivity

8 8 Electrical Conductivity Electrical Conductivity Salt ( NaCl) Salt ( NaCl) A = C.V. = C.V. ΔΓ ΔΓ /A /A ρ A ρ C ≈ ≈ 0.5 0.5µ µg/cm g/cm 2 /µ µS (5Kg/m S (5Kg/m 2 /S) C 2 / 2 /S) Electrolyte Electrolyte Solution Na + Solution Na + Cl - Cl - V = 10ml, A = 12.5cm 2 , V = 10ml, A = 12.5cm 2 , Na + Na + NO 3 NO -2 - 2 if ΔΓ = 10µ µS/cm S/cm if ΔΓ = 10 3 Na + Na + 2 x 10 = C C x 10cm x 10cm 2 x 10µ µS/cm S/cm ÷ ÷ 12.5cm 12.5cm 2 A = 2 ρ A ρ Cl - Cl - SO 4 SO - - = 4µ µg/cm g/cm 2 or 4 mg/m 2 salt = 4 2 or 4 mg/m 2 salt 4 Cl - Cl - SO 4 SO (considered as NaCl) -2 - 2 (considered as NaCl) 4

9 9 Results & Findings Results & Findings

Bresle Method Method Bresle 10 10 ISO 8502- -6, 6, - -9 9 ISO 8502

11 11 Ion Chromatography Ion Chromatography DIONEX TM TM , DX300 , DX300 DIONEX

12 12 Ion Chromatography Ion Chromatography Ion Conc. (mg/l) Ion Conc. (mg/l) Ion Concentration, Ion Concentration, PPM PPM( ( ㎎ ㎎ / / ℓ ℓ ) ) A A B B C C D D E E F F Cl - - 1.0 1.0 1.1 1.3 1.1 0.9 Cl 1.0 1.0 1.1 1.3 1.1 0.9 NO 3 NO - - 0.1 0.1 0 0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 3 PO 4 3- - - - - - - - PO 3 - - - - - - 4 SO 4 2- - 0.4 0.4 1.0 0.5 0.4 0.4 SO 2 0.4 0.4 1.0 0.5 0.4 0.4 4

13 13 NaCl vs. TDS NaCl vs. TDS Conductivity meter Ion Chromatography Conductivity meter Ion Chromatography Methods Methods NaCl/TDS NaCl/TDS Measured Converted to Measured Converted to Measured Converted to Measured Converted to (%) (%) Conductivity Conductivity TDS TDS Cl Cl - - Cl - Cl - NaCl NaCl / ㎝ / ㎡ / ℓ / ℓ / ㎡ ㎲ / ㎎ / ㎎ / ㎎ / ㎎ / ㎝ ㎡ ℓ ℓ ㎡ ㎲ ㎎ ㎎ ㎎ ㎎ A 12.1 72.6 3.6 1.0 20.2 27.8 A 12.1 72.6 3.6 1.0 20.2 27.8 B 5.7 34.2 1.7 1.0 20.2 59.1 B 5.7 34.2 1.7 1.0 20.2 59.1 C 7.4 44.4 2.2 1.1 22.2 50.0 C 7.4 44.4 2.2 1.1 22.2 50.0 D D 7.4 7.4 44.4 44.4 2.2 2.2 1.3 1.3 26.3 26.3 59.2 59.2 E E 6.2 6.2 37.2 37.2 1.84 1.84 1.1 1.1 22.2 22.2 59.7 59.7 F 5.1 30.6 1.52 0.9 18.2 59.5 F 5.1 30.6 1.52 0.9 18.2 59.5 TDS: Total Dissolved Salt Total Dissolved Salt TDS:

14 14 NaCl (Bresle Bresle vs. IC) vs. IC) NaCl ( m 2 2 /m Ion conc. mg/ Ion conc. mg Sample No. Sample No.

15 15 NaCl (Bresle Bresle vs. IC) vs. IC) NaCl ( NaCl ratio(%) in the extracted Salt NaCl ratio(%) in the extracted Salt ) (%) (% Sample No. Sample No.

16 Chlor*Test *Test™ ™ 16 Chlor Sleeve Sleeve Tube glass Tube glass NaCl alone is detected ! NaCl alone is detected !

17 Chlorine Paper/Strip 17 Chlorine Paper/Strip

NaCl Extraction Rate 18 NaCl Extraction Rate 18 140 9 Bresle Bresle 8 120 Chlor*Test Chlor*Test 7 100 Level ( ㎍ / ㎠ ) 6 Level ( ㎍ / ㎠ ) 80 5 4 60 3 40 2 20 1 0 0 Case 1 조건1 Case 2 조건2 Case 3 조건 3 Case 1 Case 2 Case 3 Ratio (B:C) Bresle Method( Method( ㎍ / ㎠ ) Ratio (B:C) Bresle ㎍ / ㎠ ) Chlor*Test *Test TM ( ㎍ / ㎠ ) Chlor TM ( ㎍ / ㎠ ) Case 1 4.1 2 2.0 : 1 Case 1 4.1 2 2.0 : 1 Case 2 Case 2 7.9 7.9 5.7 5.7 1.4 : 1 1.4 : 1 Case 3 121.7 32.5 3.7 : 1 Case 3 121.7 32.5 3.7 : 1

Conclusions 19 Conclusions 19 1. Upon using Bresle Bresle Method, Method, actual content of actual content of 1. Upon using NaCl was below 60% of TDS. . NaCl was below 60% of TDS 2. M Many other anions any other anions were co were co- -existed existed in the in the 2. extracted solution. extracted solution. 3. IMO IMO PSPC PSPC’ ’s s salt salt limit needs correction; limit needs correction; 3. 1) Bresle Bresle method: method: salts salts limit limit ≤ ≤ 8 80 0 mg/m mg/m 2 1) 2 2) Allow Chloride only measuring Method 2) Allow Chloride only measuring Method

20 20 Thank you ! Thank you !