Welded Base Plate

Little difficult to understand for me. LPG tanks? How big - horizontal - vertical? Normally the base should be strong enough to support a full tank. Are you going to join pieces lengthwise or laminating them to get a thicker one? The latter is not such a good idea because it will cause extensive rust. Normally the norms are about the tanks, not the supports. I have seen big cylindrical tanks laying down on concrete saddles.

If prepared and welded properly the weld seam should be at equal to, or stronger, than base metal. Bevel plate edges, do full penetration welding with backgouging, NDT, etc. per ASME Sec IX, and grind top and bottom weld to be flush with plate surface. Ensure proper base plate and weld materials. Also, must ensure that both plates are level after welding to reduce additional loading stress. As an alternative, consider cutting the second plate in half and butt welding to both ends of center plate. Same weld procedures should be used. Selection may be dictated by location of anchor bolts (should not be on a weld seam).

If this is for trade use this would not be satisfactory under the Pressure equipment directive 97/23 EC