Abstract: A pressure resisting barrier wall resistant to accidental explosions and fires or hydrostatic pressure comprising a corrugated wall member (100) having a series of side by side corrugation which viewed in transverse section each comprise spaced first and second base portions (102, 102?) by a polygonal arch having at least three sides (106, 106?, 108, 108?) within said archacurved or polygonal arch reinforcement wall (124, 124?, 124?, 125) springing from side portions of said polygonal arch.

Abstract: An explosion relief panel (34) suitable for use as a roof panel and comprising, when oriented as a roof panel, a raised longitudinally extending edge portion (52) which is raised above a respective adjacent longitudinally extending drain portion (53) of the panel and which has a second raised longitudinally extending portion (54) which is raised above a respective adjacent longitudinally extending drain portion (55) lying between said second raised portion (54) and said edge portion (52), the said second raised portion being fixed to a first support member (38) and the said edge portion being mounted to a second support member (40 or 42) in a manner such as to be released therefrom in response to an overpressure applied beneath the roof panel to allow the edge of the roof panel to be deflected upwardly to release said overpressure whilst the second portion of the roof panel remains fixed to said first support member.

Abstract: A pressure resisting barrier wall resistant to accidental explosions and fires or hydrostatic pressure comprising a corrugated wall member (100) having a series of side by side corrugation which viewed in transverse section each comprise spaced first and second base portions (102, 102?) by a polygonal arch having at least three sides (106, 106?, 108, 108?) within said archacurved or polygonal arch reinforcement wall (124, 124?, 124?, 125) springing from side portions of said polygonal arch.

Abstract: An explosion relief panel (34) suitable for use as a roof panel and comprising, when oriented as a roof panel, a raised longitudinally extending edge portion (52) which is raised above a respective adjacent longitudinally extending drain portion (53) of the panel and which has a second raised longitudinally extending portion (54) which is raised above a respective adjacent longitudinally extending drain portion (55) lying between said second raised portion (54) and said edge portion (52), the said second raised portion being fixed to a first support member (38) and the said edge portion being mounted to a second support member (40 or 42) in a manner such as to be released therefrom in response to an overpressure applied beneath the roof panel to allow the edge of the roof panel to be deflected upwardly to release said overpressure whilst the second portion of the roof panel remains fixed to said first support member.