API-650 11th Edition

There are changes from the API-650, 10th edition to the 11th edition. I will be reviewing some of these changes over the next several postings. So here goes!

Added new paragraphs 1.1.4 and 1.1.5 and revised 1.1.6 and 1.1.18 to specify that Appendix L data sheets are mandatory unless waived by the purchaser, all tanks and appurtenances shall comply with the data sheet and attachments, field tanks shall be furnished completely erected, tested, and ready for service connections unless specified otherwise, and shop tanks shall be furnish tested and ready for installation.

Added Appendix W providing recommendations covering commercial and documentation issues.

Added section 1.3 to outline the responsibilities of the parties involved.

Added section 1.4 to specify documentation requirements.

References was moved to section 2 instead of being a part of section 1.

Added section 3 to provide definitions.

Material are now in section 4 and have the following changes:
1) Rimmed or capped steels are not permitted.
2) Cast iron for pressure parts or for attachment by welding to the tank is prohibited.
3) Cadmium-plated components shall not be used without the consent of the purchaser.
4) Added section 4.7 on bolting stating that (unless otherwise specified on the data sheet) flange bolting shall be A193-B7, anchors shall be threaded A36 round bar with heavy hex nuts and shall be galvanized, and all other bolting shall be A307 or A193, and A325 may be used for structural purposes only.
5) Added section 4.8 on welding electrodes.
6) Added section 4.9 stating gasket material is to be specified on the data sheet and shall not contain asbestos unless specified by the purchaser. Gaskets shall be made with integral centering or positioning device. No sealing compound, adhesive, or lubricant shall be used unless specifically allowed by the purchaser. Spare gaskets are not required unless specified on the data sheet.
7) Test gaskets must have comparable dimensions and compressibility characteristics as service gaskets. Descriptions of gaskets for temporary use only as test gaskets shall be submitted for purchaser’s approval.
8) The test gasket for joints that will not be disassembled after testing must be the specified service gasket.
9) Flange bolts and nuts used for testing are acceptable for use in the completed tank except for stainless steel bolting.

This takes us through section 4. Next time we will continue our look at the changes in the 11th edition.