Anchor and method for reduced Cr (VI) (hexavalent chromium) exposure in a vessel
View Patent ↗An anchor for use interior of a carbon steel vessel, the anchor comprising a carbon steel anchor element and a carbon steel base, the anchor allowing welding of the base to the wall of the vessel without release of hexavalent chromium during installation. A method for installing a stainless steel anchor element to the interior wall of a carbon steel vessel, comprising welding the stainless steel anchor element to a carbon steel base in a ventilated environment exterior of the vessel interior and subsequently welding the carbon steel base to the vessel wall interior of the vessel.
1. A method for preventing worker exposure to hexavalent chromium vapor when installing a stainless steel anchor element onto the interior surface of a vessel comprising carbon steel, the method comprising:
an element-to-base welding step comprising welding said stainless steel anchor element to a carbon steel base;
a base-to-vessel welding step comprising welding said carbon steel base to said interior surface of said carbon steel vessel wall;
wherein said element-to-base welding step is conducted exterior of said vessel.
2. The method of claim 1 , wherein said element-to-base welding step is conducted remotely from said vessel.
3. The method of claim 2 , wherein the wall of the vessel is curved, and wherein the carbon steel base is curved to conform to the curvature of the vessel wall.
4. A method for preventing a worker from being exposed to hexavalent chromium vapor when installing a stainless steel anchor element onto the interior surface of a vessel, the method comprising
a first welding step wherein said stainless steel anchor element is welded to a carbon steel base at a location exterior of said vessel;
a second welding step wherein said carbon steel base is welded to said interior surface of said vessel; and
an anchoring step wherein a refractory material is anchored to said interior surface by attaching said refractory material to said stainless steel anchor element.
5. The method of claim 4 further comprising a rounding step wherein the corners of said carbon steel base are rounded.