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This reverse air baghouse expansion joint was made of EPDM operating at above 400F, the EPDM got brittle and ended up adhering itself to the duct and cracking across the bottom – filling the penthouse with SO2 gas. Our team retrofitted the expansion joint with one made of PTFE (Teflon) that could handle the temperature. Reverse air ducts can be hard on equipment because they switch from positive to negative pressure, so you want an expansion joint belt with no excess width in it, or it will get sucked into the duct during pressure changes and wear the edges of the belt out.
These Vogt-Nem OEM Penetration Seal Expansion Joints we’re exposed to a temperature excursion beyond their intended max when the false floor in the HRSG collapsed. You can see that the metal has started to anneal, which means it could fail at that point and cause a safety hazard. This is a good application for INTEREP’s Interflex bellows insulation system, which will allow the unit to run until the next outage with no safety concerns if a failure should occur.
These guys just finished installing 60 penetration seals (a full Alstom HRSG) which replaced the OEM “Korema Kompensatorenwerk” silicone & fiberglass expansion joints. All of the welded flange-studs on the front module (HPSH) had corroded and rusted, many had broken off. It was a gnarly job crawling around beneath the structural steel and welding them back together, but Steam Generation Corp was up to the task, and they’ve got the bruises to show it!
What happens when you heat liquid carbon dioxide? #Cardox – high-pressure gas (>40,000psi) Cement plants use it to clear plugged preheater tower meal-pipes. This metal bellows was too close to a Cardox charge (top left) which destroyed the refractory meal-pipe lining & damaged the expansion joint. The refractory was repaired with Blu Ram (phos-bonded mullite) and we manufactured a new bolt-in metal bellows expansion joint which slides into the meal-pipe (bottom left & right).
If you look closely at the restraining hardware (tie-rods) on these expansion joints, you’ll see there are no outboard nuts. That means these EJs are exerting their full pressure thrust upon the adjacent piping. Apparently the elbows below them are handling it well, as they’ve been installed for 15 years.