Digital montage (1)

The Fluid Systems Engineering and Management Blog

by Swagelok Northern California

Detecting Damage in HRSG T-91 Tubing

by Jeff Hopkins, on 8/14/18 9:00 AM

New Damage Mechanism, Dubbed “Exfoliation”

Intertek specialists have finally identified the damage mechanism long suspected in Grade-91 tubing (T-91). They presented their findings at the February 2018 HRSG (heat recovery steam generator) User’s Group Conference.

If reheater tubes reach a high enough temperature (1,150F), spinel oxide scale begins to build up on the interior surfaces. When the scale reaches sufficient thickness, layers of it break off, a process dubbed “exfoliation.” The spinel then travels downstream and forms deposits on steam turbine stop valves or other components that experience high steam velocities. The process repeats over and over, and is accelerated by flow abnormalities. Intertek recommends employing a continuous monitoring system just upstream of duct burners, to ensure they are not raising the temperature of the tubing.

Read the article in Power to learn more→

Topics:Mission Critical

We perform under pressure

Your fluid systems can't fail—and they can't leak. That's why Swagelok Northern California offers mission critical solutions for the petrochem, semi, power, and oil and gas industries around the Bay Area and into NW Nevada. We manufacture and assemble reliable, customizable components that get the job done. Contact our team today to learn about custom solutions for your plant or refinery.

Swagelok Northern California
Fremont headquarters

3393 W Warren Ave
Fremont, CA 94538
Main tel: 510-933-6200
Email: Message us

Areas served by our fluid systems engineering company