Decoding Manufacturing Dates For Regulators And Flashback Arrestors, Components, such as elastomers and seals, will deteriorate from their date of manufacture whether in gas service or not. The document provides information for identifying the age of regulators and flashback arrestors from two manufacturers based on markings: 1) Regulators and flashback arrestors from Supplier 1 include a production Replace pressure regulators and flashback arrestors every five years after the manufacturing date to prevent degradation and leakage. It provides a coding system for batch/lot numbers and a schedule for maintenance and safety checks. Flashback arrestors have to be tested for gas non-return, for tightness and for gas flow by a qualified person depending on the country specific regulations. Z 2007 2031 Date Code ‘WC’ (shown) indicates date of manufacture as: 2004, March. Features Pressure sensitive cut-off valve to prevent further gas supply after a flashback (activated by the pressure shock in front of the flashback). Protect regulators and gas cylinder against flashback and detonation. Manufacturing date code can be found on the flashback arrestor. doc / . New SIRE update - what does the change mean for tankers? The manufacturing date of the Flash Back Arrestors S-55, W-66 and 85-10 is engraved in a code on their cylindrical sides. gby0, mh, c4b2, sz, xqv, k23b, lgxek, ptumeyi, n5, ph,