AEG pipeline products have been used for several decades around the world by major oil & gas engineering firms and EPC contractors. To date we have supplied more than 50000 successfully operating high pressure monolithic isolation joints to more than 200 onshore/offshore oil & gas projects.


Propipe Engineering & AEG JV are based in Madrid, Spain. The JV will capitalize on the strong reputation AEG has developed as a leading provider of monolithic isolation joints and on Propipe’s strength and experience in the oil & gas market.


Propipe Engineering & AEG JV will be able to draw on the skill and resources of a complete range of specialized pipelines products. We are delighted to now be able to offer our existing clients the truly complete range of products and services, and are equally looking forward to developing new relationships with the extended client base in Europe and America.



Some pipelines deteriorate slowly, and in certain cases pipeline life has been targeted at 70 years or more. Other pipelines have been built and have exhausted their life cycle after 1 year of  operation.


Metals corrode because we use them in environments where they are chemically instable. Only  copper and the precious metals (gold, silver, platinum etc..) are found in nature in their metallic state. All other metals are processed from minerals or ores into metals which are inherently unstable in their environments.


Corrosion is the major cause of reportable incidents in major oil and gas projects. Corrosion is also the major cause of pipeline failures. Corrosion related problems cost to the transmission  pipeline industry billions of dollars, divided into the cost of failures, capital and operations and  maintenance.


Wherever you find oil and gas pipelines, you also find a wide array of reliable APP isolation joints.


The correct location of monolithic isolation joints helps to reduce the overall cost of corrosion control systems and save millions of dollars by improving efficiency against corrosion problems.

Technical Remarks



NDE Pup Bevels

NDE W3 Closure Weld

NDE W1-W2 Butt Welds

Pneumatic Air Test

Hydrostatic Test

Hydro-Fatigue Test (barg x cycles)

Electric Insulation Resistance

Dielectric Strenght Test

Design Code

Design Factor

Max Allowable Loads


Resin Filler


EN 10204 3.1 or 3.2




10 bar 10 Min.

At Test Pressure or as per customer requirements

5 Cycles at 80% TP or as per customer requirements

>200 MΩ

5 to 12  kV (AC) % 50 Hz (1-5 min)


0,2 to 0.6

Up to 95% SMYS-based on customer requiremnts

NEMA G11 Class H

Cold Cured Epoxy



For Onshore Projects:


To limit the spread and hence the cost of cathodic protection to those pipelines that need to be effectively and economically protected by the main cathodic protection system.

To electrically "split-up" long pipelines into distinctive cathodic protection system.

To isolate a pipeline and ensure that cathodic protection or stray electricity currents do not cause increased corrosion.

To provide protection against earthing currents at domestic and industrial premises where the PME system is in use.


For Offshore Projects:


In riser pipes and offshore structures to isolate the pipeline cathodic  protection system.

At field "tie-ins”

To isolate a pipeline and ensure that cathodic protection or stray electricity  currents do not cause increased corrosion.



APP monolithic isolation joints are manufactured in accordance with the highest recognized international standards, which guarantee mechanical requirements (torsion, traction, bending etc..) are met for the very specific need of any project.

APP monolithic isolation joints are designed and manufactured in sizes range OD 1 "up to OD 96”.

Pressure rating from ANSI 150# up to API 10000#.

All type of carbon steel and stainless steel materials are used in design and fabrication





No loss of integrity due to thermal expansion or ground stress as is common with flange isolation gasket kits.

In-house tested hydraulically and electrically to 1½ times the design pressure.

Maintenance free, reliable cathodic isolation of equipment in required strategic applications such as compressor stations.

No labor intensive or complicated installation procedure required as is with isolation gasket kits.

No inspection pits, vaults or maintenance needed.

Isolate stray currents impressed on the pipe from outer forces such as electrical transmission systems and earth currents.

Excellent bending and torsion resistance.