REDOX hydraulic pipes are MACHINED and are free of rust causing chemical residues found in pickled pipe.

The typical hydraulic system’s wetted surface is 90% pipe. REDOX machines pipe to same I.S.O. cleanliness level required by many servo components in your system. Systems plumbed with REDOX pipe give years of trouble-free service.
Make the right choice for your pipe - always use REDOX.

We have decades of experience installing REDOX throughout the world. Call our engineers at (601) 229-0960 to learn about the cost savings of using REDOX pipe. PDI also builds REDOX prefabricated hydraulic spools for those demanding the lowest cost installed systems outperforming all others. Call today for a quote on pipe or prefabricated spools for your system.

Clean by Design

System cleanliness impacts your bottom line. REDOX integrates multiple Standards achieving better performance than a single Standard provides alone. Our integrated Standards approach allows the implementation of:

• Scale resistant welding

• Smooth stress relieved surfaces lowering the coefficient of friction

• Flushing time measured in hours; not days or weeks

• Reduced filtration costs

• Corrosion resistant I.D. pipe surfaces


Standards specify results.

Our integrated Standards reduce fabrication, start-up, and operational costs of REDOX systems.

REDOX pipes meet the following recognized hydraulic Standards:

1) All pipe shall be machine cleaned and plugged in accordance with ASTM D4174 Section and

2) Internal contamination shall not exceed an I.S.O. rating of 14/12 using testing procedures specified in S.A.E J 1227 Section 2.4.1.

3) Supplier must demonstrate the capability and the results that demonstrate that the above requirements have been met.



REDOX pipes do more than meet Standards: they deliver up-time and profit.


Continuous Quality Improvement

These 1000x electron microscope images say a thousand words about our commitment to quality. Comparing these images allow you to see why REDOX outperforms the competition:


REDOX: Note the smooth surface. There are no places for particles to hide during flushing: there are no particles.



Zinc Phosphate D.I.N.: Note the particle size range: 5 – 15 microns: one of the most destructive I.S.O. range sizes for hydraulic components.
The zinc phosphate crystals’ bond to the tube will break on the tension side of bends. Further contamination occurs as the scrubbing force of hydraulic oil changing direction at 15 feet per second abrades the remaining zinc phosphate.


Pickled & Oiled Pipe: Note the etched base metal. Pipe treated with corrosives becomes reactive. Reactive surfaces interact with oil additives, inhibiting their lubricating qualities.
Rust reformation occurs on the I.D. of pickled pipe in operating system using hydraulic oil. Our Video, Rust Never Sleeps, explains this process more fully.

Four decades of Continuous Quality Improvement has produced the most reliable pipe delivering clean fluid power for your system.




Each of these Continuous Quality Improvements play a critical role in reducing filtration and flushing costs.



No hydraulic component should fail in your system if given clean hydraulic oil. Knowing this is important: acting on this knowledge can be a game changer.
Filters are designed to remove particles generated by moving parts; not unlimited particles generated by:

• Pickled pipe
• Zinc phosphate crystals from D.I.N. tubing.


Pickled pipe contains a non-reversible / non-flushable danger: a chemically activated surface. Activated surfaces chemically react with lubricant additives, degrading lubricity. This allows metal to metal contact to occur, damaging critical surfaces and generating additional particles.
Also, pickled pipe’s etched surface at the metal grain boundaries can hold enormous amounts of < 15 micron size particles. Particles accumulate in the low pressure zones created by etching. They accumulate until there is a system shock. Shock waves will release a killer cloud of particles downstream, damaging components and overwhelming even the highest beta ratio filters.

Zinc phosphate crystals foster a different kind of contamination: silt. Silt particles are < 2 microns in size. They can hide undisturbed in low pressure zones created by zinc phosphate crystals protruding into the fluid stream. They too, respond to system shock, releasing enormous amounts of particles downstream.
Silt particles are difficult to filter. Component degradation failure is common with silt particles due to their size acting as lapping compounds, degrading critical surfaces in your components.

But, REDOX’s surface is clean, smooth and generates no particles, giving your components nothing but clean hydraulic oil.



All hydraulic systems need to be flushed prior to start-up. Flushing has limits. Knowing what is happening within your plumbing is important.
There is a direct link between the efficiency of the flush and the operating performance of the system. A few different flushing examples are:

• Pickled and oil systems oftentimes take significant time and money to flush away poorly bonded rust particles. They also have chronic problem that cannot be flushed away: chemically activated surfaces creating lubricity issues. Re-rusting can be a problem too as documented in our video below: Rust Never Sleeps.

• Zinc phosphate D.I.N. tubing does not contain rust, thus it should quickly flush. However, zinc phosphate crystals are a foreign object in the fluid stream that will cause a variety of problems. The first is the crystal structure being stretched and breaking away from the tube at the bends. The second is the remaining crystal structure creating low pressure zones at the surface that trap silt size particles that can degrade critical surfaces of your components.

REDOX pipes contain none of the issues associated with pickle & oiled pipe or zinc phosphate
D.I.N. tubing, nor does it contribute any other particle to the fluid. Flushing REDOX is both fast and effective.


REDOX out-flushes competing systems in both time and results. Our systems consistently drop one I.S.O. range number per every couple of minutes during flushing.

Our focus on creating the cleanest and most cost effective pipe to connect your components, gives you years of up-time and profitability.





REDOX pipes are engineered to resist scale formation during welding. Vapor Space Inhibiting Oils, like WD 40, are used to create a welding atmosphere that resists scale formation. Below is scale removed from pickled & oiled pipe after welding:

Scale removed from one joint of 1” SCH 80 pickled & oiled pipe after welding.
Scale is hard and brittle. When it breaks free it shatters into tiny flat particles that act like razor blades.

Ask our engineers how integrating scale resistant welding procedures can save you money and produce an exceptional product.
Vapor Space Inhibiting Oils do more than resist scale formation. They also:

• Protect pipe against rust formation better than heavy oil: ASTM D4174 Sections and
• Vapor Space Inhibiting Oils impart corrosion resistance to hydraulic oil: ASTM D4174 Section 7.1.3.
• Are useful in hydro sealing components for storage: ASTM D4174 Section Ask our engineers for details.



PDI sells REDOX to hydraulic installers and fabricates REDOX hydraulic spools for installation. PDI has the home court advantage in producing REDOX hydraulic spools:

• Manufacturing in a well equipped shop is more cost effective than field fabrication.
• PDI is a vertically integrated supplier of hydraulic systems. We own and operate the REDOX technology, giving us the ability to quickly respond to your needs.
• PDI is an infra-structure company using 3D software that quickly lays out a schematic of your system.
• A schematic drawing enables us to give you a hard number for manufacturing and installing REDOX spools.
• Machining REDOX in the building where spools are manufactured eliminates trucking costs and gives faster turnaround.
• Welded spools are hydro tested and flushed in-house, eliminating the costs of field testing.
• Spools are purged with nitrogen prior to sealing and in-house painting.
• We also manufacture spools for lube oil, fuel oil and other distillates.
• We install what we build at a guaranteed price.



Video:  Rust Never Sleeps

Contact Us

Power Dynamics Innovations, LLC
1301 Martin Luther King Blvd.

Picayune MS. 39466


(601) 229-0960


About Us

PDI has been a fluid power industry leader since 1984. For over two decades we have been in southern Mississippi, and provides world-wide engineering and manufacturing solutions to the fluid power industry.

Power Dynamics Innovations engineering and manufacturing expertise is known and respected throughout the fluid power industry providing successful fluid power solutions for over thirty years.