中文 | English
 
Home About us Cathodic Protection Products Inquiry Download Contact us
 
 
Onshore
 

For onshore buried pipelines, anti-corrosion protection is typically provided by applying a protective coating on the pipeines. Our cathodic protection designs include isolation joints and a monitoring system.  

Prior to the design of a cathodic protection system for an onshore pipeline network, a site survey is recommended to collect essential information on soil resistivity, geographical characteristics, the likelihood or the existence of stray currents, and any other important features along the pipeline route.
For retrofitting cathodic protection systems on an existing pipeline, certain repairs and modifications to the pipeline may be required to achieve an effective cathodic protection. A current-drainage test is often the best and fastest method to assess the required protection current.
In order to protect the pipeline, isolation joints should be installed to prevent interaction, and loss of cathodic protection current from other pipelines.
Sacrificial anodes are preferred for technical and economic reasons. Soil resistivity is the parameter that determines the selection of the sacrificial anode alloy. Magnesium anodes can be used in soils with resistivity up to 3,000 Ohm-cm, Zinc anodes can be used in soils with resistivity up to 1,500 Ohm-cm (5.3.2). Aluminum anodes are not normally used in land applications.
 

Prepacked Zinc Anodes

 

Zinc Ribbon

 

Prepacked Magnesium Anodes

 

ICCP

 

Sacrificial Anode Specifications

 
Zinc anodes installed in soils require a prepared backfill around the anode for the following reasons:
·         To increase the effective surface area which lowers the anode-to-earth contact resistance.
·         Bentonite clay absorbs and retains moisture.
·         Gypsum provides a uniform, low resistance environment.
·         Sodium sulfate (a depolarizing agent) minimizes the pitting attack and oxide film formation.
Today, the standard backfill for magnesium and zinc consists of:
·         75% Hydrated Gypsum (CuS04+2H20)
·         20% Bentonite Clay
·         5% Sodium Sulfate.
The backfill shall have a grain size distribution such that 100% of the material passes through a #20 mesh screen, and 50% of the material passes through a #100 mesh screen.
The backfill material shall be firmly packaged around the anode by means of vibration. The backfill material shall be of sufficient quantity to cover all zinc anode surfaces to a minimum thickness of 25mm.
The standard or pre-packaged anodes are connected with a 3 meter copper wire 1X16 XLPE/PVC unless otherwise specified.
Stand Off
 
 
 
 
 
Type
L (mm)
W (mm)
D (mm)
NW (kg)
 
1300
101
101
35
 
2360
114
114
80
 
1300
120
120
50
 
1520
133
127
68
 
1525
184
159
119
 
1800
160
162
124
 
2450
160
162
164
L=Length , W=width, H=Height, NW=Net weight, GW=Gross weight
 
 
Copyright 2008-2010 SYNCOR Cathodic Protection Co,Ltd,All Rights Reserved