--- title: Containing Acid Exhaust with Fluoropolymer Coated Vent Duct description: How PSP® helped Roche Vitamins solve their hydrochloric acid exhaust duct problem, and ended the persistent corrosion that plagued their former systems. image: https://blog.cpsgrp.com/hubfs/CPSGrp_Feb2017/_Home/3%20blog%20images/FTI%20(WW%20Wally)/corrosive%20acid%20and%20acid%20fumes.png --- [![Exential_logo_white_ExAb](https://blog.cpsgrp.com/hs-fs/hubfs/Exential_logo_white_ExAb.png?width=133&height=44&name=Exential_logo_white_ExAb.png "Exential_logo_white_ExAb")](https://www.fabtechinc.com/) - [Products](https://www.exentec.net/Products/Process-Exhaust) - [Fume Exhaust Duct](https://www.exentec.net/Products/Process-Exhaust/Fume-Exhaust-Duct) - [Joining Systems](https://www.exentec.net/Products/Process-Exhaust/Joining-Systems) - [Dampers & Blastgates](https://www.exentec.net/Products/Process-Exhaust/Dampers-and-Blastgates) - [Adapters & Accessories](https://www.exentec.net/Products/Process-Exhaust/PSP-Adapters-and-Accessories) - [Literature](https://www.exentec.net/Products/Process-Exhaust/Literature-and-Downloads) - [Blog](https://blog.cpsgrp.com/fabtechinc) # Exential Process Exhaust ## Containing Acid Exhaust with Fluoropolymer Coated Vent Duct Posted by [Mike Baranski](https://blog.cpsgrp.com/fabtechinc/author/mike-baranski) on Jun 5, 2018 12:19:01 PM Find me on: [LinkedIn](https://www.linkedin.com/in/mike-baranski-b9bbb59/?ppe=1) ![corrosive acid and acid fumes](https://blog.cpsgrp.com/hs-fs/hubfs/CPSGrp_Feb2017/_Home/3%20blog%20images/FTI%20(WW%20Wally)/corrosive%20acid%20and%20acid%20fumes.png?width=177&name=corrosive%20acid%20and%20acid%20fumes.png) ### **PSP® Vent Duct Safely Handles Hydrochloric Acid Fumes** Belvidere, NJ - During the manufacture of a pilot run of innovative Vitamin C products, Roche Vitamins set out to solve a long standing problem that many pharmaceutical manufacturers and research labs face with their process ventilation systems. *That is, how to contain and convey highly corrosive acid exhaust without having to perpetually replace the vent duct system.* The original system used by Roche was comprised of Schedule 10 stainless steel pipe welded in place with only a few gasketed connections and transitions. This system was tasked with handling various process related vapors, including alcohol, chloroform, and hydrochloric acid (HCL), which are emitted as a by-product of operating vacuum belt filters during the manufacturing process. Despite being collected and removed via vent lines to be absorbed in a carbon bed scrubbing process, there were no measures in place to handle the formation of chemical condensation inside the ductwork. As a result, HCL condensate created pinhole leaks anywhere it came into contact with the stainless steel ductwork. This created a need to replace the vent duct system every six to twelve months in order to ensure a safe working environment free of hazardous acid fumes. ![PSP vent duct safely handles corroisive acid fumes](https://blog.cpsgrp.com/hs-fs/hubfs/CPSGrp_Feb2017/_Home/3%20blog%20images/FTI%20(WW%20Wally)/PSP%20vent%20duct%20safely%20handles%20corroisive%20acid%20fumes.png?width=238&name=PSP%20vent%20duct%20safely%20handles%20corroisive%20acid%20fumes.png) Faced with the many risks, costs, and delays presented by this scenario, Roche Vitamins decided to search for a permanent solution. They considered Resistoflex as one alternative but ultimately decided that they needed a more cost effective system. After some research, they decided that [Fab-Tech's fluoropolymer coated PermaShield Pipe (PSP®)](https://blog.cpsgrp.com/fabtechinc/why-process-industries-want-psp-fume-exhaust-duct) offered the same or better performance as PTFE lined pipe, but it came at a substantially greater value when factoring its longevity, versatility, safety, ease of installation, and zero maintenance. Roche Vitamins ultimately installed about 100 linear feet of 4-inch and 6-inch diameter PermaShield Pipe (PSP®) operating at a system pressure of -10" wg. They also included 2-inch and 3-inch diameter PSP-EZ™ pipe to connect industrial vacuum pumps to the entire system.  *Fab-Tech’s single fastener PSP-EZ™ band style clamp system is capable of reducing installation times by 50% over standard bolted flange fasteners.* Finally, connections to various existing system components were easily accomplished using custom ANSI style flanges which are very similar to the industry standard KF connections. Ultimately, Roche Vitamins realized a tremendous time-to-value savings by making the decision to install PSP® in their factory. Over the course of many years since their initial installation of PermaShield Pipe, the system still shows no signs of degradation from corrosive acid exhaust.  **If you would like more information about PSP® corrosive fume vent pipe and duct, please feel free to download our general information guide below:** [![Request A Discovery Call](https://no-cache.hubspot.com/cta/default/2835452/5c45c1bd-996f-43b1-ad73-773f92bac725.png)](https://cta-redirect.hubspot.com/cta/redirect/2835452/5c45c1bd-996f-43b1-ad73-773f92bac725) OR [Read More About PermaShield Fluoropolymer Coated Fume Exhaust Duct Here](https://www.fabtechinc.com/PS_PSP.php?__hstc=120297175.e8c12a3007963996d38903b0d99e5216.1490876416085.1527606425521.1527614438174.844&__hssc=120297175.4.1527614438174&__hsfp=4026344184) Topics: [vent duct](https://blog.cpsgrp.com/fabtechinc/topic/vent-duct), [acid fumes](https://blog.cpsgrp.com/fabtechinc/topic/acid-fumes) [![Request A Discovery Call](https://no-cache.hubspot.com/cta/default/2835452/5c45c1bd-996f-43b1-ad73-773f92bac725.png)](https://cta-redirect.hubspot.com/cta/redirect/2835452/5c45c1bd-996f-43b1-ad73-773f92bac725) ## Don't Lose Your Competitive Advantage ## Follow Our Blog To Keep Pace With The Latest... - 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