SEA WATER CORROSION

Content• Intention with the test• Scope• Type of products• The test• Summary2

IIntention with the testntentionwith the test• Document aluminum ferrules to be suitable forsubsea use3• Document material condition by exposingequipment in sea water for a period of time• Compare corrosion effect on different material• Document corrosion effect of different type ofcorrosive protection• Document the corrosion effects by breaktesting the equipment after exposure in seawater

Scope• Wireslings are tested at DNV test range in Bergen.• DNV is measuring and witness the testing.• 6 pcs. of wirerope sling (Same batch) terminated withpressed sleeve (ferrule) of aluminum and steel.• 2 pcs. exposed in sea water (splash zone) for a periodof 8 th month.• 4. pcs. exposed in sea water (splash zone) for aperiod of 36 month (In progress at the time)• Inspection interwall 4 – 8 - 12 – 24 and 36 month4

Type of products• 26mm wire rope 6x36 IWRC 1960 N/mm2MBL 472 kN. Standard EN-12385.4• Talurit Sylindrical ferrule (T28) – AluminumStandard EN13411.3• Talurit Sylindrical steel ferrule (SLST 27) Carbon steelStandard Talurit splicing system.5

6DNV testrange in Bergen

Testrange overview in BergenDNVW. GiertsenServices AS7

8Wireslings

Steel ferrule 4 month exposure5A5B9

Aluminum ferrule 4 month exposure1A1B10

Aluminum ferrule 4 month exposure2A w/Zink anode11

Aluminum ferule 4 month exposure4A painted4B painted12

Aluminum ferrule 8 month exposure1A1B13

Aluminum ferrule w/ zink anode - 8 monthexposure2A2A14

Steel ferrule 8 month exposure5A5B15

Aluminum ferrule 8 month exposure4A4B16

Control measureNo. Matr Protect 30.03.2010 11.08.2010 18.11.2010 MBL Break1A AL Not 56,95 56,72 -0,22 56,7 -0,2 472kN 510 kN18.11.101B 56,79 56,30 -0,49 56,6 -0,32A AL Zn 57,05 56,80 -0,25 56,9 -0,1 472kN2B 56,76 56,88 +0,11 56,8 +0,13A AL Not 57,00 56,83 -0,16 56,9 +0,1 472kN3B 56,95 56,87 -0,07 56,9 0,04A AL Paint 56,57 57,51 +0,93 56,6 +0,1 472kN4B 57,05 56,96 -0,08 57,1 +0,15A ST Not 46,60 46,49 -0,11 46,5 +0,1 472kN 510 kN5B 46,56 46,57 0,0018.11.1046,7 +0,26A ST Not 46,65 46,61 -0,04 46,4 +0,2 472kNW. Giertsen Services AS - a high quality supplier of listing equipment 176B 46,67 46,77 +0,09 46,6 +0,0

Brake test - Result 510 kN1A5B18

19Ferrules split after brake test

SUMMARY20• Aluminum ferrules are suited for subsea use,and is a cost effective alternative to steelsleeves.• Corrosion• Break test• Aluminum ferrules vs. steel ferrules• Stainless steel wire rope vs.. zinc galvanizedsteel wire rope.• Thick wall (T – TK) ferrules of aluminum• Thin wall (UM) ferrules of aluminum.

CORROSIONCorrosion effect after 4 month in sea water shows nodifferences in diameter from new ones.The measured diameter and surface of the sleeve after 8month submerged in sea water was similar to the 4month exposure.The zink anode on one wire rope was severely corrodedand after 8 month the clamping was loosened21

ALUMINUM FERRULES VSSTEEL FERRULESThe brake test shows no difference betweensteel and aluminum ferules, both broke at thesame load 510 kN.Test result from same batch and same end fittingwas done 28/3-2010 Test result was 510 kN22

23Copper ferrule on stainless steel wire rope –after 1 year in sea water

Type of ferrules -T-UM-STST-UM-T ferrulepressed T-UM-ST ferrule24

Thank you for your attentionSamples from the test canbe examined at our stand25