Expired safety certificates to blame for steam boiler explosion that k… stockbot 0 0 05.11 19:10 https://vietnamnews.vn/society/1655392/expired-safety-certificates-to-… + 0 https://vietnamnews.vn/rss/society.rss + 0 The cause of the explosion was due to the steam boiler and compressed gas cylinder having safety certificates expired, but the company did not conduct re-inspections as required, still put them into operation and production.