Vent height above roof Vent height above roof ChemGuy2016 (Chemical) (OP) 6 Dec 16 16:14 For a roof-mounted tank containing combustible liquids, how high above the roof does the tank vent need to be? RE: Vent height above roof EmmanuelTop (Chemical) 6 Dec 16 16:35 How much high for what? Dejan IVANOVIC Process Engineer, MSChE RE: Vent height above roof ChemGuy2016 (Chemical) (OP) 6 Dec 16 16:51 In terms of building safety so that the vented vapours do not enter the building. RE: Vent height above roof EmmanuelTop (Chemical) 6 Dec 16 16:55 Obviously some vapor dispersion modeling needs to be undertaken, to determine safe venting distance. Dejan IVANOVIC Process Engineer, MSChE RE: Vent height above roof ChemGuy2016 (Chemical) (OP) 6 Dec 16 19:04 I thought there were specific codes that dictate the required venting distance. Does anyone know where to find these? RE: Vent height above roof don1980 (Chemical) 6 Dec 16 20:13 For what you are discussing, the only mandatory requirements are those in OSHA 1910.106 paragraph (b)(2) and OSHA 1926.152 paragraph (I)(2)(vi). OSHA reg's apply to US facilities, and you can access them on the internet. The two reg's I mention have an elevation requirement (12') which applies to storage tanks that are "adjacent to buildings or public ways", therefore they only apply to a limited number of tanks in a refinery or chemical plant. RE: Vent height above roof georgeverghese (Chemical) 7 Dec 16 00:45 There is a big difference between a combustible liquid and a flammable liquid - you are clear that this is only combustible ? For example, diesel is classified as being combustible for cases where anything in its near environment does not enable it to exceed 55-60degC; when T > 60degC, it is classified as flammable for its service application. So does this liquid become flammable with any equipment or environment it may come into contact with inside the building if the tank does overflow?