About Us

Henan LIMING Heavy Industry Science and Technology Co. LTD which mainly manufacture large and medium-sized crushing and grinding equipments was founded in 1987. It is a modern joint-stock corporation with research, manufacturing and sales together. The Headquarter is located in HI-TECH Industry Development Zone of Zhengzhou and covers 80000 m ². Another workshop in Shangjie Industry Park covers 67000 m ². Over the more than 30 years, our company adheres to modern scientific management system, precision manufacturing, pioneering and innovation. Now LIMING has become the leader in domestic and oversea machinery manufacturing industry.

120

million

cubic meters

Industrial chain production base

70

national patents

689sets

national patents

170

Equipment service country

Company Culture

core values of the company

Create Value

Share Value

Observe Order

Respect Value

Service philosophy

Religious, fine, tight, and harmonious

LIMING spirit

Standardization, value, serialization, and differentiation will always exceed our contract

Brand Concept

Create and promote civilization, refine and interpret brilliantly

Business philosophy

Religious, meticulous, rigorous, and harmonious work

Our Global Footprint

Case Scene

CATHODIC PROTECTION CALCULATION

2017-11-20  The positive ground bed system consists of a remote horizontal anode system. The design of GB shall be for maximum output current and for a 20 years period. To obtain minimum no. of anodes in each GB, three cases shall be calculated and maximum of those shall be selected.

EXAMPLE Design of a Galvanic Anode Cathodic

2007-11-13  Design of a Galvanic Anode Cathodic Protection System For a Pipeline Assumptions: Multiple Anode Groundbed System with Magnesium Anodes Pipe length is 2500 ft. Pipe diameter is 6 in. OD = 6.625 in. Coating quality is 98% Desired Current density is 2 mA/sq.ft. Soil Resistivity is 1000 ohm-cm Anode type is standard potential magnesium.

DESIGN OF DEEP ANODE GROUND BED FOR CATHODIC

Design of Deep Anode Ground Bed for Cathodic Protection of Oil Pipelines Using Pv Modules At Port Harcourt, Nigeria 1Mee, A.U., 2Ahmed, A.D., 3Udounwa, A.E. and 2Wansah, J.F.* 1Department of Physics and Astronomy, University of Nigeria, Nsukka 2Department of Physics, Madibbo Adama University of Technology, Yola

Learn A Real World Cathodic Protection Calculation ...

2021-6-21  Cathodic protection calculation for a solar farm. Finally, let’s do our calculation for an embedded steel structure in the soil. We want to install 378 steel stanchions for our solar farm. We need to protect these stanchions from corrosion. First, we calculate how

CATHODIC PROTECTION DESIGN - USNA

2021-4-2  This is the anticipated current density required once the cathodic protection system has reached its steady state. The average or maintenance current density is used to calculate the minimum mass of anode material required to protect the structure throughout the design life. 5.1.2 Coated Steel

Cathodic Protection Field Installation Guide-NEW

2015-12-14  Cathodic protection is a means of reducing corrosion of a metal by artificially causing direct current to flow from external anodes, through the electrolyte (soil or water), and onto the structure to be protected. The two types of CP systems are galvanic anode and impressed current. Galvanic anode CP systems provide cathodic current by galvanic ...

CATHODIC PROTECTION SYSTEM DESIGN.ppt

2013-10-9  Cathodic Protection Rectifier Anode Groundbed Gas Pipeline Water Pipeline (-) (+) Current Discharge (Corrosion) Current Discharge (Corrosion) Stray Current Due to Impressed Current Cathodic Protection System

TM 5-811-7 Electrical Design, Cathodic Protection

2013-4-4  CATHODIC PROTECTION DESIGN 2-1. Required information. resistivity increases, the corrosion rate decreases Before dec iding which type, galvanic or impressed curre nt, cathodic protection system will be used and before the system is designed, certain prelimi-nary data must be gathered. a. Physical dimensions of structure to be pro - tec ted.

Anode Weight Calculation Formula - BoatZincs

2021-6-23  For steel and aluminum boat hulls (or underwater structures) the following formula can be used to calculate the total weight of sacrificial anodes required. Anode Weight (lbs) = [ (Wetted Surface Area) x (Current Density) x (Immersion)] [ (Energy Content) x (1000 mA/Amp)] Estimating Wetted Surface Area of Boat Hulls:

#27 Design of Cathodic Protection System - City gas ...

For cathodic protection design that involves magnesium anodes, these potentials 0.70 and 0.90 volts, should be used depending on the alloy selected. 4) Calculate the number of anodes needed to meet ground-bed resistance limitations: The total resistance (Rt)

An Introduction to Sacrificial Anode Cathodic Protection

2014-12-27  2. SACRIFICIAL ANODE CATHODIC PROTECTION SYSTEM DESIGN PROCEDURES. The basic principles for the design of sacrificial anode cathodic protection systems are: first, the total amount of current is determined, then the output per anode is determined. Then the number of anodes required and the life of the anodes is determined. If

Designing a sacrificial anode system

2011-12-21  For cathodic protection of larger structures involving use of six or more anodes or an impressed current (rectifier) system, additional steps must be taken to assure proper functioning of the system, i.e., proper distribution of the anodes, prevention of damage to other buried metal work, design of an economic system, and proper operation and ...

CATHODIC PROTECTION SYSTEM DESIGN.ppt

2013-10-9  CATHODIC PROTECTION SYSTEM DESIGN • Presented By DENIS L ROSSI P.E. • CORROSION ENGINEER ... Cathodic Areas Anodic Area Pipe Wood Bed Block . Scarred/Damaged Surface Corrosion Threads, scratches and dents are anodic ... Anodes should be installed 18” below and 18” to the side of the pipe.

Cathodic Protection Field Installation Guide-NEW

2015-12-14  Cathodic protection is a means of reducing corrosion of a metal by artificially causing direct current to flow from external anodes, through the electrolyte (soil or water), and onto the structure to be protected. The two types of CP systems are galvanic anode and impressed current. Galvanic anode CP systems provide cathodic current by galvanic ...

Cathodic Protection Design Spreadsheet - CivilWeb

The CivilWeb Cathodic Protection Design Spreadsheet calculates the required current densities automatically from the guidance in BS EN 13174. Once the required current demand is determined for all three design checks the anodes can be designed. The current output of the anodes depends on the number, size, shape, type and composition of the anodes.

DNV-RP-B401: Cathodic Protection Design

2013-3-26  1.1.1 ‘Cathodic protection’ (CP) can be defined as e.g. “electrochemical protection by decreasing the corrosion potential to a level at which the corrosion rate of the metal is significan tly reduced” (ISO 8044) or “a technique to reduce corrosion of a metal surface by maki ng that surface the cathode of an electrochemical cell”

Anode Weight Calculation Formula - BoatZincs

2021-6-23  Anode Weight Calculation Formula. For steel and aluminum boat hulls (or underwater structures) the following formula can be used to calculate the total weight of sacrificial anodes required. Anode Weight (lbs) = [ (Wetted Surface Area) x (Current Density) x (Immersion)] [ (Energy Content) x (1000 mA/Amp)] Wetted Surface Area (sq-ft):

(PDF) DESIGN OF IMPRESSED CURRENT CATHODIC

In our research, we will only concentrate into impressed current cathodic protection (ICCP) which is commonly used in big structure or component protection. ICCP systems require the use of an external DC power supply that is energized by standard AC current.

Pipeline Cathodic Protection Design 12 Things to

2019-6-25  Pipeline cathodic protection design for new pipelines may appear to be a rather easy task for anyone with a basic understanding of cathodic protection.. However, as with all design efforts there are a wide number of factors that need to be considered for a sound design

An Introduction to Sacrificial Anode Cathodic Protection

2014-12-27  2. SACRIFICIAL ANODE CATHODIC PROTECTION SYSTEM DESIGN PROCEDURES. The basic principles for the design of sacrificial anode cathodic protection systems are: first, the total amount of current is determined, then the output per anode is determined. Then the number of anodes required and the life of the anodes is determined. If

Designing a sacrificial anode system

2011-12-21  For cathodic protection of larger structures involving use of six or more anodes or an impressed current (rectifier) system, additional steps must be taken to assure proper functioning of the system, i.e., proper distribution of the anodes, prevention of damage to other buried metal work, design of an economic system, and proper operation and ...

DEEP ANODE BED FOR CATHODIC PROTECTION -

DEEP ANODE BED FOR CATHODIC PROTECTION. United States Patent 3725669. Abstract: The method and apparatus for placing an impressed current or sacrificial anodes in a deep bed to provide cathodic protection of underground metallic structures and for easily replacing anodes which have been expended. Inventors:

Groundbed design - Corrosion Doctors

2011-12-21  Groundbed Design. For underground structures requiring cathodic protection, the location and nature of the site where the anode is placed needs careful consideration.A low soil resistivity, which would otherwise be classified as a highly corrosive soil, is not the only factor which determines the location of the anode.Other factors to be considered include the presence of foreign metallic ...

A calculation model for cathodic protection of

2001-2-15  Proper design of cathodic protection by use of impressed current cable anodes requires the knowledge of current and potential distribution along the anode and the structure to be protected. The conductive coupling between these earth-return circuits results in different current and potential distributions along both structures when comparing with the case of separate anode.

Cathodic Protection Design Spreadsheet - CivilWeb

The CivilWeb Cathodic Protection Design Spreadsheet calculates the required current densities automatically from the guidance in BS EN 13174. Once the required current demand is determined for all three design checks the anodes can be designed. The current output of the anodes depends on the number, size, shape, type and composition of the anodes.

DNV-RP-B401: Cathodic Protection Design

2013-3-26  1.1.1 ‘Cathodic protection’ (CP) can be defined as e.g. “electrochemical protection by decreasing the corrosion potential to a level at which the corrosion rate of the metal is significan tly reduced” (ISO 8044) or “a technique to reduce corrosion of a metal surface by maki ng that surface the cathode of an electrochemical cell”

Design Cathodic Protection System

2020-6-7  Consideration for Design of Galvanic Anode Cathodic Protection System. N ormally cathodic protection (CP) can be applied by a sacrificial anode or impressed current system. CP can be applied by galvanic or sacrificial system when limited amounts of current are needed, soil resistivity is low (normally less than 5,000 ohm-cm), and electric power ...

(PDF) DESIGN OF IMPRESSED CURRENT CATHODIC

In our research, we will only concentrate into impressed current cathodic protection (ICCP) which is commonly used in big structure or component protection. ICCP systems require the use of an external DC power supply that is energized by standard AC current.

Pipeline Cathodic Protection Design 12 Things to

2019-6-25  Pipeline cathodic protection design for new pipelines may appear to be a rather easy task for anyone with a basic understanding of cathodic protection.. However, as with all design efforts there are a wide number of factors that need to be considered for a sound design