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Another common example of passive cathodic protection is hot-dipped galvanized steel. During this process, steel members or structures are immersed in a molten zinc bath that coats the object. When the steel is removed from the molten zinc, it reacts with air and moisture to form a protective layer known as zinc carbonate, which creates a ...

Coke Breeze Calculators | Farwest Corrosion Control

yachts and powerboats, offshore oil platforms and onshore oil well casings. Today, galvanic or sacial anodes are made in various shapes using alloys of zinc, magnesium and aluminium. The electrochemical potential, current capacity, and consumption rate of these alloys are superior for CP than iron. [4 ] 1.2 The aim of present work

CP Design Center

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systems are to consider the structure to be protected as a whole as well as individual componentswhich are ... 13.3 Anode Resistance Calculations..... 14 ABSGUIDANCE NOTES ON CATHODIC PROTECTION OF OFFSHORE STRUCTURES. 2018 iii. TABLE 1 Recommended Initial Design Current Densities for Bare ...

Examples of Design for

2 Examples of Design for Cathodic Protection Systems † Soil resistivity in the service area. † Structure to soil potential shift required to produce polarization needed to meet ca- thodic protection criteria. This is the immediate change in potential of an isolated structure measured to a point at "remote earth" when cathodic protection is applied.

Cathodic Protection Field Installation Guide

Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. A simple method of protection connects the metal to be protected to a more easily corroded "sacial metal" to act as the anode.The sacial metal then corrodes instead of the protected metal.


For example, in the DC cathodic protection of deep well casing, the protection depth can only reach about 1500 m. If the pulse current cathodic protection technology is used, the protection depth can be extended to more than 3000 meters . Metwally introduced a theoretical investigation of the pulse cathodic protection systems to show how they ...

Soil resistivity measurement

The utilization factor is dependent on the anode design, particularly on its dimensions and the location of anode cores. Table 6.15 presents anode utilization factors, based on DNV RP B401, that are used for design calculations. According to BS, an anode utilization factor of 0.90 for the long, slender, stand-off type shall be considered in design.


AN INTRODUCTION TO WELL DRAWDOWN SEVERAL KEY TERMS ASSOCIATED WITH WELL DRAWDOWN are listed below. Static level Static level is the level of water in a well when no water is being taken from the well by pumps It is usually expressed as the distance in feet or meters from the ground surface to the water level.

2.0 Activation Overpotential

The anode geometrical factor is 0.9 for long thin anodes and 0.85 for others. An example of a calculation below, that could be a small pump, shows the total amount of zinc required to protect uncoated cast iron of 1 m 2 in stagnant water and 0.5 m 2 with a water velocity of 5 m/s for one year:

Some simple procedures for the calculation of the ...

Data Set C represents an excellent location for anode location even though the surface soils have relatively high resistivity. It would appear from this set of data that anodes located >1.5 meters deep, would be in low-resistivity soil of ~800 ohm-cm, such a figure being conservative for design purposes.

Anode Utilization Factor

Deep Well anode groundbed • Utilizes anodes installed electrically remote from the structure in a vertical hole drilled to a minimum depth of 50 feet and in some cases, as deep as 1000 feet • Deep anode groundbeds are usually effective when high surface soil resistivity exist over deeper low-resistivity areas where the anodes are installed. •


Examples of total head calculations - sizing a pump for a home owner application 14. Examples of common residential water systems 15. Calculate the pump discharge pressure from the pump total head ... Figure 3c Typical deep well residential submersible pump. 2. Three important characteristics of pump systems: pressure, friction and flow

Deep Well Anode System Design | Matcor, Inc.

For example, because it is i n a soil with low resistivity compared to the rest of the line. Current would leave the pip eline at that anode site, pass through the soil, ... The resistivity data wil l be used to calculate the sizes of anodes and rectifier required in designing the cathodic protection system. Table 2-1. Corrosivity of soils on ...

Cathodic protection

Note: Anodes should be installed 18" below and 18" to the side of the pipe. The anode should be also be soaked with water before backfilling. Do not carry by the wire. Sacial Magnesium Anode. R +-Rectifier Groundbed IJ IJ Rectifier Anode Groundbed. POLE MOUNTED RECTIFIER. Typical Arrangement of Cathodic Protection For Tanks Rectifier


Dec 06, 2019· Decommissioning a deep anode well, or ground bed simply by removing the surface hardware and walking away is often no longer acceptable. This is due to concerns with environmental impacts and safety hazards associated with the deep hole into which the anode assembly was installed.

Study on the Influence of Pulse Current Cathodic ...

yachts and powerboats, offshore oil platforms and onshore oil well casings. Today, galvanic or sacial anodes are made in various shapes using alloys of zinc, magnesium and aluminium. The electrochemical potential, current capacity, and consumption rate of these alloys are superior for CP than iron. [4 ] 1.2 The aim of present work


Again earth resistances can be determined by calculation. Deep Well Groundbeds: Where soil resistivity at the surface are very high, a series of vertical anodes are sometimes installed in deep well groundbeds (up to 100 m and more deep). To determine the depth of the well it may be necessary to carry out a soil resistivity survey.

Groundbed design

anodes are examples of galvanic anodes. As stated in NCHRP Report 558, when selecting a cathodic protection system for a given structure, several issues need to be considered: o Long-term rehabilitation: the system is most effective for if a long-term repair (5 to 10 years) is desired.


Coke Breeze Volume & Weight Calculations. Volume: To calculate the number of cubic feet of coke breeze, select the applicable hole diameter in inches (column 1), look up the cubic feet per lineal foot (column 2), and multiply by the depth of the hole in feet. Weight: To calculate the number of pounds of coke breeze, select the applicable hole diameter in inches (column 1), look up the ...

Cathodic protection

Mar 29, 2019· To calculate the horsepower of a water pump, check the water level in the base reservoir tank to ensure it's full, and empty the second tank, or the destination reservoir. Measure the vertical distance between the water level in the base reservoir tank and the water input at the destination tank and write down the measurement in feet.

If deep well ground anodes fail little can be done if the ...

Jun 12, 2018· As an example, one method calculates desired flow at 7 GPM for a 1 bathroom home and 17 GPM for a home with 3 or 4 bathrooms. After you determine your desired flow rate, make sure that your well is capable of supporting it. Calculate Total Dynamic Head (TDH):

Cathodic Protection of Storage Tank

shape. The well known approach of Thiem (Thiem 1906), al-lows the calculation of the R parameter during steady state. When considering a non-steady situation (transient), R is a bit more uncertain and of limited use (Dragoni 1998). In a non equilibrium state, R varies continuously due to the unbalance between recharge and discharge.

example of deep well anode calculation

Anodes Should Be Installed in Moist Areas ... (Used to calculate voltage gradients in uniform soil due to an energized groundbed) Example: February 21-23, 2017 Keith Boswell, National Pipeline Services, LLC. 34 I = 5 amperes .