cathodic protection wrap pipe

7/29/2019 Cathodic Protection Wrap Pipe

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Cathodic protection was first described by SirHumphry Davyin a series of papers presented to theRoyal Society[2]

in London

in 1824. After a series of tests, the first application was to theHMS Samarang[3]in 1824.Sacrificial anodesmade

fromironwere attached to thecoppersheath of the hull below the waterline and dramatically reduced the corrosion rate of the

copper. However, a side effect of the CP was to increase marine growth. Copper, when corroding, releases copper ions which

have ananti-foulingeffect. Since excess marine growth affected the performance of the ship, theRoyal Navydecided that it

was better to allow the copper to corrode and have the benefit of reduced marine growth, so CP was not used further.

Davy was assisted in his experiments by his pupilMichael Faraday, who continued his research after Davy's death. In 1834, he

discovered the quantitative connection between corrosion weight loss and electric current and thus laid the foundation for the

future application of cathodic protection.[4]

Thomas Edisonexperimented with impressed current cathodic protection on ships in 1890, but was unsuccessful due to the

lack of a suitable current source and anode materials. It would be 100 years after Davy's experiment before cathodic protection

was used widely on oil pipelines in the United States[5]

[edit]Types

[edit]Galvanic CP

Galvanic anodesare designed and selected to have a more "active" voltage (more negativeelectrochemical potential) than the

metal of the structure (typically steel). For effective CP, the potential of the steel surface is polarized (pushed) more negative

until the surface has a uniform potential. At that stage, the driving force for the corrosion reaction is removed. The galvanic

anode continues to corrode, consuming the anode material until eventually it must be replaced. The polarization is caused by

the electron flow from the anode to the cathode. The driving force for the CP current is the difference in electrochemical

potential between the anode and the cathode.[6]

Galvanic or sacrificial anodes are made in various shapes and sizes usingalloysofzinc,magnesiumandaluminum.ASTM

Internationalpublishes standards on the composition and manufacturing of galvanic anodes.[7][8]

In order for galvanic cathodic protection to work, the anode must possess a lower (that is, more negative) potential than that of

the cathode (the structure to be protected). The table below shows a simplified galvanic series to show which metals can thus

be combined.[9]

Metal

Potential with respect to a Cu:CuSO4

reference electrode in neutral pH environment (volts)

Carbon, Graphite, Coke +0.3

Platinum 0 to -0.1

Mill scale on Steel -0.2

High Silicon Cast Iron -0.2

Copper, brass, bronze -0.2

Mild steel in concrete -0.2

Lead -0.5

Cast iron (not graphitized) -0.5

Mild steel (rusted) -0.2 to -0.5
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Mild steel (clean) -0.5 to -0.8

Commercially pure aluminum -0.8

Aluminum alloy (5% zinc) -1.05

Zinc -1.1

Magnesium Alloy (6% Al, 3% Zn, 0.15% Mn) -1.6

Commercially Pure Magnesium -1.75

[edit]Impressed current CP

For larger structures, galvanic anodes cannot deliver economically enough current to provide complete protection. Impressed

current cathodic protection (ICCP) systems use anodes connected to aDCpower source. Usually this will be acathodic

protection rectifier, which converts an AC power supply to a DC output. In the absence of an AC supply, alternative power

sources may be used, such as solar panels, wind power or gas powered thermoelectric generators[10][11]

Anodes for ICCP systems are available in a variety of shapes and sizes. Common anodes are tubular and solid rod shapes or

continuous ribbons of various materials. These include highsiliconcast iron,graphite,mixed metal

oxide,platinumandniobiumcoated wire and others.

[edit]Applications

[edit]Pipelines

An air cooled cathodic protection rectifier connected to a pipeline.

Pipelines are routinely protected by a coating supplemented with cathodic protection. An ICCP system for a pipeline would

consist of a DC power source, which is often an AC powered rectifier and an anode, or array of anodes buried in the ground

(the anodegroundbed).

The DC power source would typically have a DC output of between 10 and 50amperesand 50volts, but this depends on

several factors, such as the size of the pipeline. The positive DC output terminal would be connected viacablesto the anode

array, while another cable would connect the negative terminal of the rectifier to the pipeline, preferably through junction boxes

to allow measurements to be taken.[12]

Anodes can be installed in a vertical hole and backfilled with conductivecoke(a material that improves the performance and life

of the anodes) or laid in a prepared trench, surrounded by conductive coke and backfilled. The choice of grounded type and

size depends on the application, location and soil resistivity.[13]

The output of the DC source would then be adjusted to the optimum level after conducting various tests including

measurements ofelectrochemical potential.
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It is sometimes more economically viable to protect a pipeline using galvanic anodes. This is often the case on smaller

diameter pipelines of limited length.[14]

[edit]Ships

Cathodic protection on ships is often implemented by galvanic anodes attached to the hull, rather than using ICCP. Since ships

are regularly removed from the water for inspections and maintenance, it is a simple task to replace the galvanic anodes.[15]

Galvanic anodes are generally shaped to reduced drag in the water and fitted flush to the hull to also try to minimize drag.[16]

Smaller vessels, with non-metallic hulls, such as yachts, will also use galvanic anodes to protect areas such as the rudder, but

depend on an electrical connection between the anode and the item to be protected.

For ICCP on ships, a DC power supply is provided within the ship and the anodes mounted on the outside of the hull. The

anode cables are introduced into the ship via acompression seal fittingand routed to the DC power source. The negative cable

from the power supply is simply attached to the hull to complete the circuit. Ship ICCP anodes are flush-mounted, minimizing

the effects of drag on the ship, and located a minimum 5 ft below the light load line[17]in an area to avoid mechanical damage.

The current density required for protection is a function of velocity and considered when selecting the current capacity and

location of anode placement on the hull.

Some ships may require specialist treatment, for example aluminum hulls with steel fixtures will create an electrochemical cell

where the aluminum hull can act as a galvanic anode and corrosion is enhanced. In cases like this, aluminum or zinc galvanic

anodes can be used to offset the potential difference between the aluminum hull and the steel fixture.[18]If the steel fixtures are

large, several galvanic anodes may be required, or even a small ICCP system.

[edit]Marine

Marine CP covers many areas, jetties, harbors, offshore structures. The variety of different types of structure leads to a variety

of systems to provide protection. Typically, galvanic anodes are favored,[19]but ICCP can also often be used.

[edit]Steel in Concrete

The application to concrete reinforcement is slightly different in that the anodes and reference electrodes are usually embedded

in the concrete at the time of construction when the concrete is being poured. The usual technique for concrete buildings,

bridges and similar structures is to use ICCP,[20]but there are systems available that use the principle of galvanic CP as

well,[21][22][23]although in the UK at least, the use of galvanic anodes for atmospherically exposed reinforced concrete structures

is considered experimental.[24]

For ICCP, the principle is the same as any other ICCP system. However, in a typical atmospherically exposed concrete

structure such as a bridge, there will be many more anodes distributed through the structure as opposed to an array of anodes

as used on a pipeline. This makes for a more complicated system and usually an automatically controlled DC power source is

used, possibly with an option for remote monitoring and operation.[25]For buried or submerged structures, the treatment is

similar to that of any other buried or submerged structure.

Galvanic systems offer the advantage of being easier to fit retrospectively, since the anodes are fitted on the concrete surface

and do not need any control systems as ICCP does.
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For pipelines constructed from pre-stressed concrete cylinder pipe (PCCP), the techniques used for CP are generally as for

steel pipelines except that there is a need to take steps to avoid an excessive level of potential that can produce cause possible

damage to the prestressing wire[26]

The steel wire in a PCCP pipeline is stressed to the point that any corrosion of the wire can result in failure. An additional

problem is that any excessive hydrogen ions as a result of an excessively negative potential can cause hydrogen embrittlement

of the wire, also resulting in failure. The failure of too many wires will result in catastrophic failure of the PCCP.[27]To implement

ICCP therefore requires very careful control to ensure satisfactory protection. A simpler option is to use galvanic anodes, which

are self limiting and need no control.[28]

[edit]Internal CP

Vessels, pipelines and tanks which are used to store or transport liquids can also be protected from corrosion on their internal

surfaces by the use of cathodic protection.[29]

ICCP and galvanic systems can be used.[30]

[edit]Galvanized steel

Galvanizinggenerally refers tohot-dip galvanizingwhich is a way of coating steel with a layer of metallic zinc. Galvanized

coatings are quite durable in most environments because they combine the barrier properties of acoatingwith some of the

benefits of cathodic protection. If the zinc coating is scratched or otherwise locally damaged and steel is exposed, the

surrounding areas of zinc coating form a galvanic cell with the exposed steel and protect it from corrosion. This is a form of

localized cathodic protection - the zinc acts as a sacrificial anode.

It should be noted that galvanizing, while using the principle of cathodic protection, is not actually cathodic protection. CP

requires the anode to be separate from the metal surface to be protected, with an ionic connection through the electrolyte and

an electron connection through a connecting cable, bolt or similar. This means that any area of the protected structure within

the electrolyte can be protected, whereas in the case of galvanizing, only areas very close to the zinc are protected. Hence, a

larger area of bare steel would only be protected around the edges.

[edit]Testing

Electrochemical corrosion potentialis measured withreference electrodes.Copper-copper(II) sulfate electrodesare used for

structures in contact withsoilor fresh water.Silver chloride electrodesorSaturated calomel electrodes(SCE) are used

forseawaterapplications. The methods are described in[31]

along with the sources of error[32]

in the voltage that appears on the

display of the meter. Interpretation of electrochemical corrosion potential measurements to determine the potential at the

interface between the anode of the corrosion cell and the electrolyte requires training[33]and cannot be expected to match the

accuracy of measurements done in laboratory work. It is widely recognized that errors can be introduced in all measurements

where there is a lack of training.

[edit]Problems

[edit]Production of hydrogen ions

A side effect of improperly applied cathodic protection is the production ofhydrogenions, leading to its absorption in the

protected metal and subsequenthydrogen embrittlementof welds and materials with high hardness. Under normal conditions,

the ionic hydrogen will combine at the metal surface to create hydrogen gas, which cannot penetrate the metal. Hydrogen ions,

however, are small enough to pass through the crystalline steel structure, and lead in some cases to hydrogen embrittlement.
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iki/Reference_electrodehttp://en.wikipedia.org/wiki/Electrode_potentialhttp://en.wikipedia.org/w/index.php?title=Cathodic_protection&action=edit&section=12http://en.wikipedia.org/wiki/Coatinghttp://en.wikipedia.org/wiki/Hot-dip_galvanizinghttp://en.wikipedia.org/wiki/Galvanizinghttp://en.wikipedia.org/w/index.php?title=Cathodic_protection&action=edit&section=11http://en.wikipedia.org/wiki/Cathodic_protection#cite_note-29http://en.wikipedia.org/wiki/Cathodic_protection#cite_note-28http://en.wikipedia.org/w/index.php?title=Cathodic_protection&action=edit&section=10http://en.wikipedia.org/wiki/Cathodic_protection#cite_note-27http://en.wikipedia.org/wiki/Cathodic_protection#cite_note-26http://en.wikipedia.org/wiki/Cathodic_protection#cite_note-25


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[edit]Cathodic Disbonding

This is a process of disbondment of protective coatings from the protected structure (cathode) due to the formation of hydrogen

ions over the surface of the protected material (cathode).[34]Disbonding can be exacerbated by an increase in alkali ions and an

increase in cathodic polarization.[35]The degree of disbonding is also reliant on the type of coating, with some coatings affected

more than others.[36]Cathodic protection systems should be operated so that the structure does not become excessively

polarized,[37]since this also promotes disbonding due to excessively negative potentials. Cathodic disbonding occurs rapidly in

pipelines that contain hot fluids because the process is accelerated by heat flow[citation needed].

[edit]Cathodic Shielding

Effectiveness of cathodic protection systems on steel pipelines can be impaired by the use of solid film backed dielectric

coatings such as polyethylene tapes, shrinkable pipeline sleeves, and factory applied single or multiple solid film coatings. This

phenomenon occurs because of the high electrical resistivity of these f ilm backings.[38]Protective electric current from the

cathodic protection system is blocked or shielded from reaching the underlying metal by the highly resistive film backing.

Cathodic shielding was first defined in the 1980s as being a problem, and technical papers on the subject have been regularly

published since then.

A 1999 report[39]concerning a 20,600 bbl (3,280 m3). spill from aSaskatchewancrude oilline contains an excellent definition of

the cathodic shielding problem:

"The triple situation of disbondment of the (corrosion) coating, the dielectric nature of the coating and the unique

electrochemical environment established under the exterior coating, which acts as a shield to the electrical CP

current, is referred to as CP shielding. The combination of tenting and disbondment permits a corrosive environment

around the outside of the pipe to enter into the void between the exterior coating and the pipe surface. With the

development of this CP shielding phenomenon, impressed current from the CP system cannot access exposed metal

under the exterior coating to protect the pipe surface from the consequences of an aggressive corrosive environment.

The CP shielding phenomenon induces changes in the potential gradient of the CP system across the exterior

coating, which are further pronounced in areas of insufficient or sub-standard CP current emanating from the

pipeline's CP system. This produces an area on the pipeline of insufficient CP defense against metal loss aggravated

by an exterior corrosive environment."

Cathodic shielding is referenced in a number of the standards listed below. Newly issued USDOT regulation Title

49CFR192.112, in the section forAdditional design requirements for steel pipe using alternative maximum allowable

operating pressure requires that "The pipe must be protected against external corrosion by a non-shielding coating" (see

coatings section on standard). Also, the NACE SP0169:2007 standard defines shielding in section 2, cautions against the

use of materials that create electrical shielding in section 4.2.3, cautions against use of external coatings that create

electrical shielding in section 5.1.2.3, and instructs readers to take 'appropriate action' when the effects of electrical

shielding of CP current are detected on an operating pipeline in section 10.9.
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Known a s a leader in the industry, the Kingdom has witnessed major

developments in the pipeline industry. To meet the demands of the harsh

environment and for protection of cross-country and sub-sea oil, water and

gas pipelines against corrosion the Al-Qahtani Pipe Coating Terminal was

established in 1954. Since those early days when coat and wrap were used,the Company has rapidly moved to new technological advantages available

today and has three coating plants in the Kingdom equipped with the latest

coating techniques.

Nature of Business

Corrosion Control Coatings and other Shop Services

Internal & External Fusion Bonded Epoxy Coating

External 3 layer polyethylene and polypropylene coating

External Heat Activated tape wrap

Internal Cement Lining

Internal & External Liquid Coating

Internal & External Coating of Girth Welds

Custom Coatings

Applied Coatings for Heat Exchangers, Vessels and Boilers

Weight coating by impingement and compression methods

Double Joint Welding of Pipes

Fabrication (cutting, rebevelling and welding)

Field Coatings & Related Services

Internal & External FBE coating of Girth Welds

External Heat Shrink Sleeve Installation on Girth Welds

In-Situ Rehabilitation of Pipes

External Liquid Coatings

Thru-kote sleeves for shop & field installation.

Fusion Bonded Epoxy (FBE) Coatings

Fbe coatings, both internal & external, are essentially single layer (thin) coatings. These are designed for corrosion


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protection on steel substrates (especially pipes & fittings).

Al-Qahtani Pipe Coating is the licensee applicator for specialized coating systems in Saudi Arabia and the Middle

East. The high performance coating systems are basically intended for downhole tubular's, OCTG's, pipelines and in-

plant piping systems. The comprehensive range of epoxies, phenolic's & urethanes serve a wide range of uses in

stringent environments.

Thru-Kote UB connections are also marketed & installed by AQPCT under a license agreement. These are the only

weldable connections for surface pipings that help maintain continuous

coating integrity after welding.

Cement mortar lining

This type of lining / coating is used for pipelines for potable water.

Double jointing

This process is designed to join two double random length pipes into an 80

LF long double joint. This effectively reduces field welding / x-ray / girth

weld coating into half.

Fabrication

Shop welding has advantages over field welding. Spools can be welded and coated in the same location in ideal

conditions.

Three Layer (Polyethylene / Polypropylene) Coatings

3 LPE & 3LPP coatings are thick coatings, which not only provide the anti

corrosion properties of FBE which is the first layer (primer), but also

provides mechanical protection due to the thick layer of either PE or PP.

3LPE is rated for low temperature services, whereas 3LPP is rated for

services upto 120? C.

Al-Qahtani Pipe Coating was the first in Saudi Arabia and the Middle East

to apply 3 layer polyethylene coating on 80" diameter pipes for a SWCC

(Saline Water Conversion Corporation) water pipeline project. It was a

technological achievement to be able to perform such a difficult coating on

a very large diameter pipe in accordance to stringent specifications. By this

success, client's such as SWCC are not relieved of past design constraints

and can now design their future projects based on this higher diameter coating capability of AQPCT.

Negative buoyancy Concrete weight coatings

These are essentially applied to add weight to sub sea or subkha pipelines.

Weight coatings arenormally applied over any type of anti corrosion coatings

such as FBE epoxy or coal tar. Can be applied by two different methods,

compression coat or impingement.

Applied coatings for heat exchangers, vessels and boilers

Applied on internal and / or external surface of tube bundles, vessels, tanks,

etc. This coating prevents fouling & incrustation in the heat exchangers and

enhances life of the same. Maintenance / cleaning costs are greatly reduced
http://ahqsons.com/pipecoating.htmhttp://ahqsons.com/pipecoating.htmhttp://ahqsons.com/pipecoating.htmhttp://ahqsons.com/pipecoating.htm


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due to less maintenance requirement.

Custom Coating

Al-Qahtani has the most modern and technically advanced facility for

applying External/Internal FBE, high temperature phenolic and other

coatings on pipe fittings, pipe spools, valves, vessels, heat exchangers,

tanks etc. These are professionally applied by highly skilled personnel to

very stringent standards. Girth weld coatings of precoated, prefabricated

pipes and fittings are applied in theshop as well as at client jobsites by

specially trained people.

Internal Fusion Bonded Epoxy Coating Of Field Girth Welds

Al-Qahtani Pipe Coating Terminal developed the capability to coat the

internal girth weld area of the coated pipes from sizes 12.750 inch up to 60

inch diameter. Capabilities can be developed for larger diameters if so required by clients. This service contributes to

providing an end-to-end corrosion protection system with fusion bonded epoxy. The most modern internal line travel

equipment performs functions of cleaning, vacuuming, coating and video inspection of the girth weld area.

External Fusion Bonded Epoxy Coating Of Field Girthwelds

Al-Qahtani Pipe Coating Terminal also developed the capability to coat the external girth weld area of the coated

pipes from sizes 2 inch up to 60 inch diameter. Capabilities can be developed for larger diameters if so required by

clients. This service contributes to providing an end-to-end corrosion protection system with fusion bonded epoxy.

Pipeline Rehabilitation

Al-Qahtani Pipe Coating Terminal developed its own spread of line travel equipment for hydroblast cleaning, sand

preblasting, grit blasting, spray coating of the external surface of pipe. Pipelines where tape coatings or similar

coatings have failed are field rehabilitated while in service or out of service using in-situ techniques to remove failed

coatings like tape wraps or other external coatings and reapplied with liquid coatings like coal tar / polyurethane.

Joint Wrap Tapes for Steel PipeWeld Bead

Add to BasketAdd to Product FavoritesShareFaceBookTwitterFriendfeedGoogle

Product Description

Name: Joint wrap tapes for steel pipe weld bead

Type: SXT365, 380, 3100, 3130

Brand: QIANGKE

Features:

The tape consists of two layers, which are adhesive (inner layer of butyl rubber)

And film (outer layer of polyethylene)

Tapes specifications:

1) SXT-365 with 0.65mm / 25mil thickness and 50 - 800mm width

2) SXT-380 with 0.76mm / 30mil thickness and 50 - 800mm width

3) SXT-3100 with 1.02mm / 40mil thickness and 50 - 800mm width4) SXT-3130 with 1.27mm / 50mil thickness and 50 - 800mm width

5) Thickness: 0.35mm - 1.50mm
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9/23

6) Width can be 50mm, 75mm, 100mm, 150mm, 230mm, 300mm

7) Length: 30 - 200m

Packing: Carton

HS Code: 391910999

Trademark: Qiangke

Model NO.: SXT

Productivity: 8000 sqm per day

Unit Price: US $ 2.8

Shipment Terms: Container

Minimum Order: 1 mt

Origin: China

Packing: carton

Type: Seal Tape

Export Markets: South America, Southeast Asia, Africa, Mid East,Eastern Asia

Company: Shandong Xunda Science TechnologyDevelopment Co., Ltd.

Three Layer Polypropylene Tape

System (3LPP)

PRODUCT DESCRIPTION

3LPP is similar with 3LPE coating system, the difference is instead of using Polyethylene as an outer layer, 3LPP uses Polypropylene tape. 3LPP is provide forimproved impact and abrasion resistance compared to 3LPE and is suitable with operation temperatures of more then 110 C. 3LPP consisting of a inner layer ofFusion Bonded Epoxy, copolymer adhesive layer and outer layer of Polyethylene. Inner layer provide corrosion protection and flexibility while outer layer ofPolyethylene provide impact and abrasion protection. Between the inner and outer layer are tape.

The total thickness and combination of various layers used will be in accordance to users spec

Internal Liquid

Epoxy Coating
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PRODUCT DESCRIPTION

This application uses a two-part liquid epoxy paint system which is applied in a single coat as anticorrosion protection for steel pipes. The first process the p ipesgo through are cleaning & blasting. Then liquid epoxy is applied to the pipes inner surface by spray guns in a bogey, forming a uniform single layer epoxy

which cure after application.

Three Layer Polyethylene

System (3LPE)

PRODUCT DESCRIPTION

3LPE is a coating system consisting of an inner layer of Fusion Bonded Epoxy, copolymer adhesive layer and outer layer of Polyethylene. Inner layer providecorrosion protection and flexibility while outer layer of Polyethylene provide impact and abrasion protection. Between the inner and outer layer are tape.

The total thickness and combination of various layers used will be in accordance with users specificatio

FBE

Coating
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PRODUCT DESCRIPTION

This application uses Fusion Bonded Epoxy (FBE) powder as anticorrosion protection for steel pipes. FBE is a uniform single layer film coating offering goodflexibility and excellence resistance to cathodic disbondment.

The first process the pipes endure are that they be cleaned & heated. Then the FBE powder is applied to the pipe surface by electrostatic guns, forming auniform single layer film which cure shortly after application.

For more severe abrasive & temperature conditions, Dual Layer FBE should be applied. Dual layer FBE is a dual powder abrasion resistant coating which isdesigned to provide excellent abrasion resistance to the pipes.

Spiral Welded Pipe

PRODUCT DESCRIPTION

Top-quality products win you market share, but to hold on to it you need top-quality service. That is why KHI Pipe provides a

package of services extending far beyond production.

TYPICAL PRODUCT PROPERTIES

Total Design Capacity : + 200,000 tons/year

Oil / Gas Line pipe Capacity : + 120000 tons/year

Structural / Pilling Capacity : 160,000 tons/year

Water Pipe Capacity : 160,000 tons/year

Diameter : 4.5 118

Wall Thickness : 3.2 mm25 mm

Material : Up to SMYS 70.000 Psi

ERW Pipe


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TYPICAL PRODUCT PROPERTIES

Total Design Capacity : + 70.000 Ton/year

Maximum speed : 40 metre/minute

Specification : API 5 L

Diameter : 4.5 12.75

Wall Thickness : 4.75 mm12.7 mm

Material : Grade material max API X-65

Cement

Mortar

Lining

PRODUCT DESCRIPTION

Coating mortar lined pipes are centrifugally lined at the factory to assure that the best possible quality control is maintained and that a uniform thickness ofmortar is distributed throughout the entire length of pipe. Cement linings prevent tuberculation by creating a high pH at the pipe wall, and ultimately byproviding a physical barrier to the water. Cement linings are also smooth, which results in a high flow coefficient.

Pipe Corrosion protection inner wrapping tapeComposition: It is tape-shaped anticorrosion material made of Polyethylene film heat laminated with adhesive layer of butyl glue.

Usage: It is extensively used in the pipework of oil and natural gas transportation, petrochemical industry, electric power, metallurgy,

urban natural gas network of pipes, the outside anticorrosion project of the metal pipes involved as well as the outside anticorrosion

project of the underground and overhead metallic conduit of the works of petrochemical industry, natural gas and coal transportation

Thickness: 0.30 - 1.30mm

Width: 50, 75, 100, 150, 230, 300mm

Length: 30 - 200m

Features:
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Excellent adhesion to pipe and self

Resistant to UV

Can be applied over a wide temperature range

Good conformability and consistent uniform thickness

Easily applied with no special equipment

Compatible with common pipe coatings

Excellent resistance to cathodic disbondingMeets ASTM D1000 Standard

Cold applied

Application:

Prepare surfaces by removing all loose scale, rust or other foreign matter by grit blasting or wire brush. Surface must be clean, dry and

free of grease. Apply thin film of Butyl Primer to all surfaces to be wrapped and allow to dry. Peel back interleaving and apply adhesive

side of the tape to the surface and press down. Apply the tape spirally with enough tension to make it conform. Remove interleaving as

wrapping proceeds. Overlap each turn by at least 1" or 55% to achieve double thickness.


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15/23

Quick Details

Material: PE Type: Other Usage: Packaging Film

Feature: anticorrosion Hardness: Soft Transparency: Opaque

Place of Origin: Shandong

China (Mainland)Brand Name: XUNDA Model Number: T 150 250

Color: White,BlackMaterial: PE and butyl

rubberThickness: 20 mils

Tensile strength: 25 N/cm Application: Corrosionprotection material Manager system: ISO9001,ISO 14001,OHSMS


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18001

Test report: SGS

Packaging & Delivery

Packaging

Detail: 360*360*320 mm

Delivery Detail: 7 days

Specifications

Inner layer: butyl rubber

Outer layer: polyethylene

Thickness: 0.80 mm to 2.0 mm

Width: 50-900mm

Length: 30 -400 m

Cold applied coating adhesive tape :Polyethene is used as the base material which is coated by the liquid butyl rubber film,

both of which are pressed and compounded. It is mainly used on underground, underwater and overhead pipelines.

Inner Wrap : provides a permanent bond to the primed steel pipes surface and provides protection against chemical

electrolytic corrosion for under ground and off shore pipeline.

The main Materials used are stabilized Polyethylene backing and Butyl Rubber base synthetic adhesive

Outer wrap

provides a permanent bond to the primed steel pipes surface and provides protection against chemical electrolytic corrosion

for under ground and off shore pipeline.

The main Materials used are stabilized Polyethylene backing and Butyl Rubber base synthetic adhesive


17/23

Quick Details

Material: PE Use: Masking Adhesive Side: Single Sided

Adhesive: RubberAdhesive Type: Hot Melt, Pressure

Sensitive

Design Printing: No

Printing

Place of

Origin: Shandong

China (Mainland)

Brand Name: XUNDA Color: Black,White,Gray

Film: Polythylene Adhesive: Butyl rubberManager system: ISO

9001,ISO 14001,OHSMS


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18001

Application: steel

pipe surface corrosion

resis...

Coating

system: Primer,innerwrap,outerwrap


Packaging

Detail:310*310*320, 3 rolls per carton


Specifications

Inner tape (Anticorrosion Tape),

Outer tape (Protective Tape),

PE Tape in Jumbo Roll,

Polyethylene Tape in Master Roll

1.Product Catalog:

XUNDA TAPE is mainly engaged in five series of products, which are Inner Tape, Outer Tape, Joint Tape, Tape Primer, and Putty Tape

with 10 categories in nearly 100 specifications. They can be used for the purposes of steel pipe surface corrosion resistance for various

pipelines in facility projects of petroleum, petrochemical industry, city gas, oil and gas storage and transportation, power, water supply,

metallurgy, civil aviation, etc.

1.1 Inner tape: XUNDA-T 100 series

(Anticorrosion tape, Anti corrosion tape, Anticorrosive tape) is for anticorrosion of underground, underwater, & overhead pipelines.

Features:

1) The specification of the tape consists of two layers, adhesive and film

2) Inner layer: butyl rubber

3) Outer layer: polyethylene

4) Thickness: 0.38 - 1.27mm

5) Width: 50mm, 75mm, 100mm, 150mm, 230mm, 300mm,500 mm,800mm,900mm

6) Length: 30 - 300m

1.2 Outer tape: XUNDA T 200 series

(Protection Tape, Protective Tape) is for protection of pipe and the surface of Inner Tape from damages.

Features:

1) The specification of the tape consists of two layers, adhesive and film

2) Inner layer: butyl rubber

3) Outer layer: polyethylene

4) Thickness: 0.40 - 1.30mm

5) Width: 50mm, 75mm, 100mm, 150mm, 230mm, 300mm,500 mm,800mm,900mm

6) Length: 30 - 300m


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1.3 Joint tape: XUNDa T 300 series

(Polyethylene Tape, Polyethylene Tapes, PE Tape, Rubber Tape, Butyl Tape, Butyl Rubber Tape) is for anticorrosion of field joints,

fittings, & specifically piping.

Features:

Component: backing: Polyethylene PE & adhesive: butyl rubber

Thickness: 0.38mm to 1.27mm,

Width: 50mm to 300mm

Length: 30 to 300m

1.4. Tape Primer:

(Synthetic Primer) complementary product covers of the rusting steel pipe and enable to enhance the adhesive to the pipe since it is

working with the adhesive of the polyethylene tape.

P19: Solid content 19%;

P27: Solid content 27%.

1.5. P-00 Primer, Paint Primer, Primer Paints Series Coating Systems AWWA C-214 Standard

Type of the Primer P-19 P-27

Base Rubber and Synthetic Rubber and Synthetic


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Resins Resins

Solid Content 19% 27%

Colour Black Black

Weight / Liter 0.79 KG 0.81 Kg

Flash Point +10o

F to +50o

F, -12o

C to+ 10 oC

+10o

F to +50o

F, -12o

C to+ 10 oC

Viscosity ( Time for flow 4mm

nozzle over)10 to 20 Second 15 to 30 Second

Place of Origin: Shandong

China (Mainland)Brand Name: Xunda Model Number: XUNDA T200

Type: Insulation Sheet Material: PE Application: High Temperature

Rated Voltage: 120 Tensile Strength: 50N Backing: Polyethylene

Adhsive: Butyl rubber colour: Black or white Thickness: 0.5mm-1.5mm

Standard: DIN 30672 Peel strength: 55N/Kg Elongation at break: 400%

Usage: Pipeline corrosion

protectionPipeline: Oil,,Gas water

Matched with: Inner

aticoorosion tape


PackagingDetail: 310*330*320 12Roll


Specifications

polyethylene tape

1. Cold applied tape

2. Coating system for corrosion protection of all types of underground or overhead pip

20mil outer polyethylene tape

Description

20mil outer polyethylene tape is a synthetic rubber-based material extruded into a soft permanently elastic strip, available in a roll form.

The tape possesses high levels of surface tack and performs at a wide range of temperatures.

Application

20mil outer polyethylene tape Provides a permanent bond to the primed steel pipes surface and provides protection against chemical

electrolytic corrosion for underground pipelines.

long term corrosion protection

High chemical resistance under service temperature.

Complies with EN-DIN 12068 and AWWAC-214 international standards and also IGS and IPS Iranian standards.

Outstanding electric property and permanent adhesion.

Note : Various wide , length and thickness are available for unique project requirement .

Item Name Polyethylene tapes, PE coating tapes, pipe wrap polyethylenetapes,


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Aluminum tape, polyethylene adhesive tape, butyl rubber

adhesive tape

Size of

Products1roll/set ,200ft*150mm,100ft*100mm

Material Butyl rubber Bituminous Compound and Adhesion PromotingResins

Structure 2 layers without primer,PE + adhesive

Product Color white, Black, yellow, grey

Packingshrink wrap+2pcs color labels(color labels can print customer

logo)

Package 4,6,12,24 sets/ carton

MOQ 500 roll

Samples Lead

timewithin 7 days

Payment Term 30% deposit, the balance against copy of shipping documents

Trading Term FOBGUANGZHOU/FOBSHENZHEN/FOBSHANGHAI/CIT

Delivery Date Within 10days after confirm your PO.

Country Of

Original:Shandong China

Usage:

It can be use on gas ,oil, water pipeline

polyethylene,underground overhead

Excellent adhesion to inner-layer tape and self Resistant to UV

Provides long-term corrosion protection to steel pipelines.

Repair of damaged factory applied corrosion protection.

Outlining weld beads and cut backs prior to wrapping bare-welded joints.

Outlining seams on spiral and seam welded pipe.

Primerless mastic tape readily conformable to odd-shaped pipe

fittings, valves, flanges and other buried structures.

Recommended

Temperatures

Application Temperature: from +5C to +50C

Continuous Temperature: from30C to +60C

Peak Temperature: up to +70C

PE coating extrusion system of big bore steel pipe is one of JINHU mainly

equipments, we have sold lines abroad over 40 sets since the line developed in

2001 year. They were export to countries such as Pakistan, Nigeria, South Africa,

Kenya, Sudan, and Iran etc. stable Product property, dependable quality,

reasonable prices and customer satisfaction. We have been appointed as excellent

supplier by China petroleum Pipe Company of engineering, Yadong Company,

Ruichen Company. Our line output is twice higher than other domestic like product,

lower energy consumption, to realize the cost control and reached to international

advanced level.

As a special manufacturer, we supply customers PE extrusion 500-3000kg/h with

different type and specification extrusion equipment and down lines, such as drying

system, auto-feeding system, extrusion adaptor, screen changer and tilter system.

Droppable upper wrapping type PE coatingsystem


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Two types include coating type and wrapping type, wrapping type divided into upper

wrapping type and side wrapping type. As per customers requirement, equipment

can be fixed put, drop put or several extruders combine together for use.

Coating type steel pipe get through the die tooling and then coating, mainly fit for

600mm below steel pipe coating, have the merits of convenient use, coating well-

distributed, surface smooth and bright and low cost. Straight line transportation and

wrap coating, different size steel pipe coating with different type of die tooling.

Side wrapping type with die tooling beneath steel pipe, PE and adhesive rollers

nether, adhesive and PE extruder are set up vertically (also can set

High efficiency PE special extruder

Combine side wrapping type PE coating

system

up parallelly to save place), extruders moveable as per distance between die tooling and steel pipe specification, also die tool ing

adjustable up & down as per angle between sheet between steel pipe to assure sheet can be wrapping on steel pipe smoothly. Easy

adjustment and low coast, also can work without guide roller. Also have some disadvantages such as output low, energy cost, operation

affected due to PE and adhesive rollers below the steel pipe, must equip with auxiliary roller when processing small steel pipe(below

762mm ),or the steel pipe easy jump and produce bubble in coating layer to effect product quality.

Drop put type on the base of upper set type to set extruders on the side of line (on the drop hydraulic stable as per requirement), two

sets die tooling also can be adjustable as per requirement, neednt to adjust the runner angle and easy operation; not easy to born out

and leaking caused by depart the die tooling runner, make the PE extruder adaptor more short so as to decrease pressure missing and

save energy and to increase the output. Those types can be adjusting the whole line conveniently, also save cost to achieve good

effectiveness. But the drop stable increased the cost.

ZHEJIANG JINHU PLASTIC MACHINERY CO., LTD.

Add: No.299 Hong Sheng Road, B Zhoushan Economic Development Zone, Zhoushan, Zhejiang, P.R.China

Tel: 0580-2680268 2680008 2681888 2681818 2680188 2680808

Fax: 0580-2681666P.C: 316001


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ebsite: http://www.jinhu-china.com

E-mail: [email protected]

cathodic protection wrap pipe

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