Design Codes

ASME DESIGNED, STAMPED & REGISTERED – Used when design pressure is greater than 15 psig. The vessel is stamped with the U-symbol and is assigned a National Board Number. Our engineers will run code calculation on all ASME vessels before the quoting stage to insure all ASME requirements are met.

Apache Stainless has the following code stamps:

“U” Stamp for volumes over 5 cubic feet.

“UM” Stamp for volumes under 5 cubic feet.

“R” Stamp for repairs on ASME vessel and heat transfer jackets.

ASME DESIGNED, NO STAMP – Although designed to ASME Code and inspected by Apache Stainless qualified inspector, the vessels is not stamped with the U-Symbol nor is it assigned a National Board Number. Again our engineers will run the code calculations to insure all ASME requirements are met.

ASME CONSTRUCTED (MATERIAL & WELDING ONLY) – Vessel is designed in accordance with Apache Stainless Equipment Corporation engineering standards, and ASME certified welders are used in fabrication.

API-650 APPENDIX “S” – This standard is for the design, manufacturing and testing of stainless vessels with top head, bottom head and shell specifications of 3/16” minimum plate. API-650 is often specified for large storage tanks operating at atmospheric pressure.