PFSNO Exposes T-SEP to Salt and Thermal Tests

We’ve explained how PFSNO’s T-SEP assembly improves the structural integrity of oil rigs and other marine structures, and we’ve shared how the assembly reduces maintenance costs. We have complete confidence in the innovative product that we’ve created, and we want our customers to have the same confidence.

Because it can take years to compile data on new industrial products, we chose to subject our T-SEP assembly to two tests that examine how the part will withstand harsh natural environments over the course of several years. It’s this proactive approach that differentiates PFSNO from so many competitors.

The tube separation assembly (T-SEP®)

In July 2015, PFSNO subjected its tube separation assembly (T-SEP®) to two tests that simulate rigorous offshore conditions. The tested assembly consisted of (x8) 3/8” diameter tubes manufactured from super duplex 2507 tubing. The assembly was mounted to 6” wide X 6” long fiberglass channel tray using SS316 hardware for clamping.

Salt water exposure test procedure based on ASTM G85 Annex 3

The salt water exposure test procedure, or SWAAT test, is based on ASTM G85 Annex 3, which uses a solution of sea salt in place of the standard sodium chloride. This solution is acidified with the use of Acetic acid until a ph of 2.8 to 3.0 is maintained.

Moisture is maintained throughout the test, preventing the assembly from drying and thereby decreasing the corrosion rate. A constant chamber temperature of +49C is also maintained throughout the procedure.

The T-SEP assembly is placed in an enclosed chamber where it is exposed to a changing climate comprised of the following 2-part cycle, which is repeated 21 times:

  • 30 minutes of exposure to a continuous indirect spray of acidified (pH 2.8 to 3.0) synthetic seawater solution, which falls-out on to the assembly at a rate of 1.0 to 2.0ml/80cm²/hour

followed by

  • 90 minutes of exposure to a high humidity climate of above 98%RH.

Thermal exposure test procedure test based on DS EN 60068-2-52

The thermal exposure test is based on DS EN 60068-2-52, which is used to test the relative resistance to corrosion of components or equipment exposed to a changing climate of a salt mist (spray), followed by a high humidity, at an elevated temperature.

Test specimens are placed in an enclosed chamber (a separate salt mist chamber and controlled humidity chamber are generally used), where they are exposed to a changing climate that comprises of the following 2-part repeating cycle:

  • 2.0 hours exposure to a continuous indirect spray of neutral (pH 6.5 to 7.2) salt water solution, which falls-out on to the specimens at a rate of 1.0 to 2.0ml/80cm²/hour in a chamber temperature of +15 to+35C.

followed by

  • 5 days exposure to a high humidity climate of 93%RH in a chamber temperature of +40C.

The test severity determines the number of cycle repeats. One storage period of three days at 21C-25C at 45% – 55%RH is also required.

How the T-SEP Assembly stood up to tests

After testing was completed, the tubes were observed for corrosion attack and macrograph X20 were performed.

Though the parts tested exhibited isolated red rust on the assembly nuts and washers, no attack was observed on the tubes.

Bottom Fixture Contact Area

The above photograph shows the contact point of the Bottom Tube Alignment Section to the Duplex Tubing.

See #1 on Exploded View Image Below.

Top Retainer Section

The above photograph shows the contact point of the Top Retainer Section to the Duplex Tubing.

See #2 on Exploded View Image Below.Side Contact Area

 

The above photograph shows the contact point of the Tube Spacer to the Duplex Tubing.

See #3 on Exploded View Image Below.

Exploded View

T-SEP Exploded View

 

PFSNO is committed to durable, safe innovation

At PFSNO, we always go the extra mile to ensure that the products we create and offer to our customers are both durable and safe. You can be confident that the T-SEP fastener and other innovations brought to you by our team are tested and top of the line. Contact our representatives to learn more about T-SEP fasteners and how they make offshore environments safer and more cost-effective.