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Retrofit Anode Systems ENGINEERING & DEVELOPMENT
A L L I N F O R M AT I O N I S CO R R E C T AT T I M E O F G O I N G T O P R E S S : 11/ 2 0 12
Imenco
Contents
Introduction
Imenco is a major EPCcontractor to the maritime industry. We design, develop, and manufacture a wide range of systems and products such as Diving Systems, Helicopter Refuelling Systems, Ex Cameras, Lifting and Handling products, Subsea Cameras and Subsea Tools including Subsea Lights and Lasers. Our customers benefit from over thirty years’ experience in the industry, adding value and providing smart solutions.
INTRODUC TION
03
CATHODIC PROTEC TION SYSTEMS
04
PIR ANHA™ PL ATE CL AMP
05
HUMBOLDT ™ R ADIAL BOLT CL AMP
06
HUMBOLDT ™ A XIAL BOLT CL AMP
07
GENER AL FEATURES FOR ALL CL AMPS
08
TORQUE TOOL
09
ANODE AND CL AMP CONFIGUR ATION
10
T YPICAL ANODE INSTALL ATION
11
Imenco has produced ROV installable Retrofit Anode Systems since 1999, which have proved to be very effective and installation friendly. The smart solution carter for compact design, enabling great flexibility in anode attachments. The main advantages offered by the Piranha™ and Humboldt™ anode clamps are the ease of operation and the reduced vessel time during installation.
For further information regarding the content of this brochure, contact: Kjell Ole Pedersen kop@imenco.com +47 957 01 008
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Cathodic Protection Systems METAL THAT HA S BEEN E X TR AC TED FROM ITS PRIMARY ORE (METAL OXIDES AND OTHER FREE R ADIC ALS) HA S A NATUR AL TENDENC Y TO RE VERT TO THAT STATE UNDER THE AC TION OF OX YGEN AND WATER.
The principle of Cathodic Protection (CP) is connection of a metal to be sacrificed by turning the base metal into an Cathode and allowing the attached anode to deplete.
Imenco appreciates the complexity of subsea operations and the ever changing requirements. As Cathodic protection solutions need to adapt to project requirements, Imenco offers special anode package solutions that meet the strict project needs combined with the ‘ease of use’ that has come to be associated with Imenco “Smart Solutions”. Through client issued design requirements or through a solution development partnership, Imenco will ensure focus for operational success.
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Piranha™ Plate Clamp THE PIR ANHA™ R ANGE IS INTENDED FOR PL ATE MOUNTING USE. OPER ATED WITH T WO STANDARD R ANGES 10 –35MM AND 35 –54MM, THESE R ANGES WILL C ATER FOR MOST REQUIREMENTS.
The anode clamps will be installed by using the Imenco Torque Tool. Due to the flexible design Imenco can easily make custom built solutions.
Clamp type
Plate thickness
Piranha™ (S)
10 - 35
Clamp dimensions (mm) A
B
C
D
75
20
125
115
Jaw
10 - 15
Jaw
15 - 20
Jaw
20 - 25
Jaw
25 - 30
Jaw
30 - 35
Piranha™ (M)
35 - 54
74
20
126
130
Jaw
35 - 40
Jaw
40 - 45
Jaw 8
F
E
Jaw
F
G
37
46
29
46
45 - 50 7
6
5
4
3
50 - 55
2 Gen. Tol. NS-ISO 2768 U.S.O.
NA
1 Gen. Welding Tol. NS-EN ISO 13920 U.S.O.
NA
Gen. machined surface roughness U.S.O.
NA
*Bespoke anode clamps can be made for special projects.
F
E
D
E
G
E
D
D
C
C
B
F C
A
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B
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Client
SMART SOLUTIONS Sheet Size
Drawing Scale
Projection
This drawing must not be copied or the contents thereof
B
7
Humboldt™ Radial Bolt Clamp T HE HUMBOLDT ™ R A NGE IS M A DE F OR E A S Y INS TA LL AT ION ON TO BOLT S OR RODS , A S A R A DI A L MOUN T. THIS DESIGN IS BA SED ON THE PRINCIPLE OF TORQUING THE CL AMP TO ADEQUATE TENSION.
The anode clamp provides easy handling and mating up with the ROV manipulator arm. The torque tool can be fitted with a “monkey fist” or similar arrangement for easy handling by the ROV.
A
B
C
øD
øE
F
G
H
72
20
118
80
25.4
38
46
8
20
128
80
46
48
46
8
72
8
Humboldt™ Radial 40 - 45 (19 ⁄13 ” - 13 ⁄16”)
Clamp dimensions (mm)
F
19 - 22 (3 ⁄4" - 7⁄8") E
Humboldt™ Radial
D
Bolt diameter (mm)
C
B
Clamp type
*Bespoke anode clamps can be made for special projects.
7
G
6
A B 5
C 4
E
H F 3
D Gen. Tol. NS-ISO 2768 U.S.O.
Drawn by
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2 Gen. W NS-EN U.S.O
Check
Humboldt™ Axial Bolt Clamp T HE HUMBOLDT ™ R A NGE IS M A DE F OR E A S Y INS TA LL AT ION ON TO BOLT S OR RODS , A S A N A X I A L MOUN T. THIS DESIGN IS BA SED ON THE SAME PRINCIPLE OF TORQUING THE CL AMP TO ADEQUATE TENSION.
The anode clamp provides easy handling and mating up with the ROV manipulator arm. The torque tool can be fitted with a “monkey fist” or similar arrangement for easy handling by the ROV.
Clamp type
Bolt diameter (mm)
Humboldt™ Axial
19 - 22 (3 ⁄4" - 7⁄8")
Clamp dimensions (mm) A
B
C
øD
øE
F
G
H
72
20
96
115
22.2
70
46
10
*Bespoke anode clamps can be made for special projects.
G
A B
C F H E D
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General features for all Clamps E A SY TO INSTALL AND FLE XIBLE CL AMP ARR ANGEMENT
Fastening by expanding bolt in: • Clamping on rod or bolt • Clamping on plate edges • Standardized torque tool and interface • Provides excellent mechanical attachment • Provides excellent electrical contact / bonding • Can be removed by use of extraction tool Alternative application: • Mounting of plates to existing constructions • Mechanical reinforcement to structures • Fixation of lift pads to existing structures • Attachment in concrete structures
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Torque Tool FOR E A SY INSTALL ATION OF IMENCO'S C ATHODIC PROTEC TION S YS TEMS A PURPOSE- BUILT TORQUE TOOL HA S BEEN DE V ELOPED.
The tool interfaces with the anode clamp by using a “bayonet” front-end to ensure the anode clamp is kept in position while the expansion bolt is being torqued up and the anode is fixed into its position. The torque tool can also be used to remove the anode.
Technical data (Torque tool): • Operating hydraulic pressure: 0 – 200 bar • Variable torque from: 100Nm • Max torque @ 200 bar is: 2000Nm • Weight in air: 35kg • Weight in water: 30kg • Standard equipped with ROV “Fish tail” handle
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Anode and Clamp Configurations ANODE BANK S C AN BE CONFIGURED TO SUIT ANY OPER ATIONAL REQUIREMENT INCLUDING SIZE, LOC AT ION A ND AT TACHMEN T ME T HOD. SUBSE A PROT EC T ION TO PROJEC T REQUIREMEN T.
Anode Basket GENERAL DIMENSIONS: 350 X 350 X 228 ANODE MASS: 5KG |
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520 X 520 X 270
5 -15KG
Standard Imenco anode baskets include the desired anode mass as well as a separate clamp port for transportation and optimal operational functionality. Wire length will be adapted to suit project requirements. Larger units in this style can be produced to suit larger applications.
Orbital Bracket GENERAL DIMENSIONS: 394 X 403X 200 ANODE MASS: 3 X 5KG
Where quick installation without the need for cabling in the area is desired, Imenco’s standard Orbital bracket surrounding the clamp unit is an effective solution for operational needs. Installation and protection are covered in one go.
Anode Sleds GENERAL DIMENSIONS: 2792 X 2792 X 2562 ANODE MASS: 450KG
For large protection applications, the Anode sled offers long life as well as a stable sea bed located solution. These units can be used as standalone sled units or connected together in series. Sled frames can be adapted to suit operational needs and placement restrictions. The unit is offered as standard in a box profile with shackle lifting points.
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Typical Anode Installation BELOW IS AN ABBRE VIATED DESCRIPTION OF HOW TO OPER ATE THE ANODE REPL ACEMENT TOOL.
It is assumed that the ROV has conducted a General Visual Inspection (GVI) prior to commencement of the anode installation sequence and that all parts of the selected Anode Clamp grip positions have been cleared for debris or marine growth. It is recommended that the actual plate thickness is checked as part of the ROV pre-survey. If necessary, the plate grip jaws can be replaced, see separate procedure given in section 5. For torque tool operation details, see section 4. Reference is also made to the separate torque tool instruction manual. The following procedure describes the preparation work (Task 1-6) and the typical installation sequence.
Task
Description
1
Install the Torque Tool on the ROV.
2
Adjust torque to correct value.
3
Check the tool’s holding capacity by lifting the anode clamp (while eg: located in its parking holder.)
4
Place the anode clamps in ROV tool basket with the torque tool.
5
A securing line should be fitted to the anode clamp bracket.
6
Deploy the ROV and locate the Anode Clamp on installation site.
7
Ensure that the securing line(s) is connected between the anode clamps and ROV frame.
8
Caution: Ensure that the fingers on the tool end fully engage between the clamp fingers.
9
Lift the torque tool with the Anode Clamp attached.
10
Verify the clamp jaw to be fully engaged onto the plate edge. Fig. 3.1.
11
Apply pressure to operate the torque tool CW.
12
Keep the torque tool stable and verify the rotation.
13
Remove the torque tool from the Anode Clamp by pulling it straight off the clamp nut. Verify that the installation is correct by inspecting the clamp grip on the stiffener plate edge. Fig. 3.2.
14
Remove or cut any security line from the ROV frame and the Anode Bracket.
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Fig.3.1 Installation of Anode Clamp on riser flange stiffener plate using torque tool
Fig.3.2 Anode Clamp installed
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5 8 3 W W W. K O N V O I H A U G E S U N D . N O D AT E O F P R I N T: 11/ 2 0 12
BROCHURES FROM IMENCO AVIATION FUELLING SYSTEMS BLOCKS & SHEAVES RETROFIT ANODE SYSTEMS ROV L ATCHES ROV LIFTING HOOKS & LOAD TRANSFER HOOKS ROV SHACKLES SEA LED LIGHTS SUBSEA CAMERAS, LIGHTS & LASERS SUBSEA GUIDING SYSTEMS
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