MMO Tubular Anodes

To achieve the highest protection from an impressed current system we need an anode with a very low consumption rate and a high current capacity. SYNCOR mixed metal oxide (MMO) anodes can reach these requirements.

SYCHEM Mixed Metal Oxide are comprised of a titanium substrate coated by a mixed metal oxide of Iridium (IrO2) and Tantalum (Ta2O5).

The MMO coating has the following advantageous properties:

Excellent conductivity
Resistance to acidic environments
Chemical stability
Relatively low consumption rates
Suitable for use in both chlorine and oxygen evolving electrolytes
Life expectancy of over 50 years
Simple and easy to install.

In soil and fresh water applications, the anodes have a recommended current density of approximately 100Amp/m2, and can be operated over 600Amp/m2 in seawater environments. The anode consumption in such high discharge levels is less than 1.0 mg/amp-yr.

Tubular Anodes

The tubular shape provides a larger surface area which allows greater current output and lower resistance. The tubular shape also enables the cable connection to take place at the center of the anode.

SYNCOR anodes have been specially manufactured to secure this connection between the cable and the anode. The connection is protected from moisture by using a waterproof sealant which fills the entire anode tube. The ends of the anode are then covered with shrink tubing for a completely sealed electrical connection.

Features

Multi-anode conductor
Lightweight / durable
High current output
Patented crimp connections
Dimensionally stable

Applications

Onshore

Groundbeds – Deep / Shallow / Vertical
Horizontal
Open Hole

Offshore

Sea Water
Brackish Water
Mud
Fresh Water

Substrate

Titanium (ASTM B338 Grade 1 or 2)

Coating

(IrO2 / Ta2O5)

Standard Dimensions

Anode	Diameer	Length (cm)	Weight (kg) assembled	Surface (m2)
25×500	25	500	0.55	0.039
25×1000	25	1000	1.10	0.079
32×1200	32	1200	1.40	0.121

Standard Anodes Current output

Environment	Max Current Density (A/m2)	Life time (Years)
Carbonaceous Backfilled	50A/m2	20
Calcined Petroleum backfield	100A/m2	20
Fresh Water	100A/m2	20
Brackish Water	100-300A/m2	20
Mud	100A/m2	20
Sea water	600A/m2	20

Lifetime is relevant to current output. As example if anode operate in sea water the maximum Output is 600A/m2 with life time 20 years, but if operate with 300A/m2 then life time extend to 40years.

Anode Characteristics

Environment	Anode	Current Output (A)	Life (Years)
Carbonaceous Backfilled	25x500mm	2	20
	25x1000mm	4	20
	32x1200mm	6	20
Calcined Potroleum Backfill	25x500mm	4	20
	25x1000mm	8	20
	32x1200mm	12	20
Fresh Water	25x500mm	4	20
	25x1000mm	8	20
	32x1200mm	12	20
Brackish Water (Max CD 200A/m²)	25x500mm	8	20
	25x1000mm	14	20
	32x1200mm	24	20
Mud	25x500mm	4	20
	25x1000mm	8	20
	32x1200mm	12	20
Sea Water	25x500mm	24	20
	25x1000mm	48	20
	32x1200mm	72	20

Data based on temperature range

Environment	Operation Temperature	Life time (Years)
Soil/Coke Breeze/fresh water:	5°C – 50°C	20
Seawater	10°C – 50°C	15
Mud/Brackish Water	5°C – 50°C	20

Backfill material

Chemical Composition (%)	PC	MC
Ash	0.2 % max	8-10%
Volatiles	0.3 % max	0.5 %
Moisture	0.3 % max	6-9%
Fixed Carbon	99.0% min	86.5 min (dry basis)
Sulphur	0.2% max	0.8 %
Size Grading	0.25 – 1mm	0 -10mm
Resistivity	0.1 Ohm cm	50 Ohm cm

Gypsum 75%, Bentonite 20%, Sodium Sulphate 5%

Cable

Length

Canister

OD75 x L1500mm
OD150 x L2000mm
OD150 x L2700mm

Cross section

10sqmm
16sqmm
25sqmm

Insulation/Sheathing

XLPE/PVC
HMWPE
PVDF/HMWPE

Cable Tube connection

Copper wedge

Anode tube fill with epoxy resin from both sides and tube end tapered with PVC cap. Externally heat shrink tube install.