Seawater pump riser pipes maintained after 21 years.

Scope of work

Maintenance work to clean, inspect, touch up minor mechanical damage externally, and recoat flange areas.

Products

Polyglass Standard for original coating in 1983
Corroglass 600 Series for repair work in 2004

Substrate

Steel

Coating system

Flash blast the existing coating. Grit blast damaged flange areas to ISO 8501-1, cleanliness standard SA 2 1/2 with minimum surface profile of 50μm. Apply Corroglass 600 Series to a min.dft of 1.5mm. Thickness check and spark test to 19Kv Hv-AC.

Coating credentials

These seawater pump riser pipes first came to Corrocoat 21 years ago, and were protected internally and externally with the original Polyglass Standard product. During the service life, which comprised external exposure to seawater (immersed, splash zone and atmospheric), and internally, seawater with a low hydrochlorite dosing (4%), the coating has not shown any tendency to undercut, and only minor mechanical damage was needed to be repaired. The sustained performance of Polyglass Standard under adverse operating conditions demonstrates the products’ suitability for use in diverse applications throughout industry.

Photographs

The pipes as returned after 21 years’ service
Flange area illustrating no under-cutting
Pipes in coating – almost complete

Refurbishment and protection for offshore pipeline flanges.

Scope of work

Offshore operation in Red Sea on platforms MORGAN 160 and MORGAN 36. Complete refurbishmnet of leakage, RTJ to RF conversion, corrosion protection. Pressure tested to 1500 psi. Case has an emergency character with no possibility to repare leakage by hot welding. Corrocoat cold weld solution provide 6 flange faces refurbishment during 3 days procedure.

Products

CORROGLASS 602 Series
POLYGLASS VE HA
POLYGLASS VE Pipe Gride
PLASMET ZF – for external

Substrate

Carbon steel

Application Method

Surface preparation by chemical cleaning, abrasive blasting to Sa3, applying CORROGLASS 600 Series, POLYGLASS VE HA, POLYGLASS VE Pipe Gride, PLASMET ZF for flange external.

Coating credentials

Corroglass 600 Series. A series of three coatings formulated with glass flake and top grade vinyl ester resin with a low monomer content, Corroglass 600 Series coatings offer outstanding resistance to solvent attack and chemical attack, as well as being suitable for more general use such as demineralised water, distilled water and sea water applications.

Photographs

Anomaly report – pipeline leakage
Process of refurbishment
Flage face befor and after procedure

Internal cold weld repair and corosion protection.

Scope of work

Internal surface of process vessel suffer by deeply pitted and corroded areas. Depth of pittings was measured as from 3 to 6 mm. It was essential to give back original surface shape and protect whole vessel internal against corrosion atack in future. Treated area was counted as 80 square meters from 3 o´clock to 9 o´clock.

Products

Polyglass PPA
Corrofill VE
Polyglass VE HA
Polyglass VEF

Substrate

Carbon steel

Coating system

The surface was then blasted to a cleanliness standard of ISO 8501-1 cleanliness standard SA 2 1/2 with a minimum surface profile of 50 microns. Hand application of Polyglass PPA as a primer coat to protect fresh blasted surface. Deeply pitted areas was filled by Corrofill VE to achieve smooth surface. One coat of Corrocoat’s Polyglass VEF was then applied using airless spray pump. A layer of Polyglass VEF was then applied to the inside surface of the desalter, to achieve 1250 microns DFT totaly.

Coating credentials

The whole of Corrocoat’s Polyglass range has proven highly effective in extremely corrosive environments toward to Oil and Gas Production. Polyglass offers a remarkably low permeation rate, combined with excellent resistance to abrasion and cathodic disbondment. The system provides an effective, long term corrosion barrier, preventing reductions in performance due to surface corrosion.

Photographs

2nd Stage Desalter V – 3016
Deeply pitted areas
After Polyglass range materials application

Prover loop internal corrosion protection.

Scope of work

For the prover loop to be accurate in measuring the flow of crude oil, it is essential that the lining is protected from corrosive properties found in such liquids. Therefore the loop had to be coated with a product that was able to withstand everyday usage.

Products

Polyglass VEF
Fluiglide VE

Substrate

Carbon steel

Coating system

The surface was then blasted to a cleanliness standard of ISO 8501-1 cleanliness standard SA 2 1/2. with a minimum surface profile of 50 microns. One coat of Corrocoat’s Polyglass VEF was then applied using Agmec’s airless spray pump. A layer of Fluiglide VE was then applied to the inside surface of the pipe, using the airless spray application utilising the Agmec Internal pipespray machine.

External coating system

Grit blasted externally to ISO 8501-1 – Cleanliness Standard SA 2. Applied two coats of Plasmet ZF with a topcoat of Corrothane AP1.

Coating credentials

The whole of Corrocoat’s Polyglass range has proven highly effective in extremely corrosive environments. Polyglass offers a remarkably low permeation rate, combined with excellent resistance to abrasion and cathodic disbondment. The system provides an effective, long term corrosion barrier, preventing reductions in performance due to surface corrosion.

Photographs

A prover loop system
Agmec internal pipespray machine
After Polyglass VEF application

Protecting components against sea water damage.

Scope of work

Internals of new vessel protected against sea water damage using Corroglass 600 Series and Polyglass VEF. Rebate flanges to protect against crevice corrosion. Terminate coating on steel rings.

Products

Polyglass VEF
Plasmet ZF / Corrothane AP1

Substrate

Carbon steel

Internal coating system

Grit blasted internally to ISO 8501 – Cleanliness Standard SA 2 1/2. Coated internally using Corroglass 600 Series / Polyglass VEF to a minimum 1.25mm DFT. Thickness checked. Spark tested at 19Kv. Flange faces rebated and coated to prevent crevice corrosion.

External coating system

Grit blasted externally to ISO 8501-1 – Cleanliness Standard SA 2. Applied two coats of Plasmet ZF with a topcoat of Corrothane AP1.

Coating credentials

Polyglass VEF has a proven track record protecting components against sea water damage. Many projects completed by Corrocoat for use within a sea water environment are still working well after more than 25 years in service.

Photographs

The new vessel, uncoated
Vessel coated internally and stripe coated externally in preparation for top coat
Vessel externals coated with first full coat of Plasmet ZF.