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What gasket material to use on sheet metal flanges for ventilation systems Jocelyn Vachon - VP B.Dev / Product Specialist Gasket materials require to be compressed, in order to achieve a seal. What materials should you use when flanges are simply made of thin sheet metal? Ventilation systems assembled on-site require gaskets between sections. Sheet metal flanges cannot create a high, evenly dispersed mechanical load on gasket materials, even if internal pressures are low (6 to 12 inch of water on average).   Here are a few suggestions: Closed cell sponges with a durometer of 20 to 60 (shore 00 scale) are good options Neoprene-based sponges (Robco SC-41 soft / SC-42 medium / SC-43 firm) are the most popular. Self-adhesive strips can be formed (round flanges) or cut in lengths (square flanges) for a quick and wasteless assembly PTFE saturated woven glass tapes (Robco GW-305) can be used where temperatures are above 250°F (130°C) and where a ...

   ASME PCC1-2019 : notes techniques sur les performances d'étanchéité Lotfi Grine, Eng. – Spécialiste de produit chez Robco   Dans les notes techniques suivantes, vous trouverez de précieux extraits techniques de l'ASME PCC1 2019 (directives d'assemblage de brides boulonnées (BFJA)) pour aider à mieux comprendre le comportement d'étanchéité et produire une étanchéité positive.   - Le calcul des valeurs de couple cible est basé sur la zone racine. Les zones de racine sont basées sur une série de gros filetages pour les tailles de 1 po et moins avec une série de pas de filetages de 8 pour les tailles de 1 1/8 po et plus (section H).   - La principale valeur à long terme des boulons revêtus est de protéger contre la corrosion des filetages exposés et de minimiser le couple de rupture et de retrait d'écrou, facilitant ainsi le démontage des joints (Section 7).   - La section VIII, division 1 du code ASME sur les chaudières et les appareils à pression e...

  ASME PCC1-2019 : technical notes about sealing performance Lotfi Grine, Eng. – Product Specialist at Robco   In the following technical notes, you will find valuable technical extracts from the ASME PCC1 2019 ( bolted flange joint assembly (BFJA) guidelines) to help better understand sealing behaviour and produce a positive seal. - Calculating Target Torque Values are based on the root area. The root areas are based on coarse-thread series for sizes 1 in. and smaller with 8-pitch thread series for sizes 1 1/8  in. and larger (Section H). - The major long-term value of coated bolts is to protect against corrosion of the exposed threads and to minimize break-out and nut-removal torque, thereby promoting ease of joint disassembly (Section 7). - Section VIII, Division 1 of the ASME Boiler and Pressure Vessel Code requires that nuts engage the threads for the full depth of the nut (Section 8.2).   - Start-up re-torque is performed when the temperature of ...