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API 650 was updated on November 2009. This addendum consists of the pages that have changed since the June 2007 printing of the 11th edition and Addendum 1 dated November 2008.

Except some minor changes, I noticed that Figure 4-1 was plotted for SI and Imperial Units as well. Also, this figures are given as tabular value on Table 4-3a and 4-3b. This changes are very useful.

On the other hands, the most critical change is Impulsive Natural Period equation (Eq. no : E.4.5.1-1a) in Seismic Provisions, Appendix E . This equation was changed all edition and addendum. In previous one:

T1 = 1/(2000)^1/2*(Ci*H^(ρ/E)1/2)/(tu/D)^1/2 for SI Unit

In addendum 2:

T1 = (1/(2000)^1/2)*(Ci*H/(tu/D)^1/2)*(ρ/E)^1/2 for SI Unit

This change seems to be affects many calculations. If you want to download free Addendum 2 only, please check this link. And here is the free Addendum 1 download link.

ASME Section VIII Division 1 is updated by ASME with Addendum 2009b. This version is valid on 1st of June 2009. I updated my codes also and I noticed the big change on Item UG-115(b) of ASME Section VIII Division 1.

It is stated in Item UG-115(b) of ASME Section VIII Division 1 that "The units of measurement used in Manufacturer`s Data Reports, Manufacturer`s Certificates of Compliance (UG-120), and capacity certification of pressure relief devices, and in marking or stamping pressure vessels, pressure vessels parts, and pressure relief devices, required by this Division, shall be either U.S. Customary units or SI units." Until this senteces, everthing is clear. But...

"However, one system shall be used consistently throughout for construction of pressure vessels. This includes all phases of construction (e.g., materials, design calculations, reports, fabrication, marking and stamping. See U-4."

If an AI read this sentence, he asks you that "although you use SI units, you must indicate all ASME flanges, ASME pipes and fittings etc. in SI units too". It is ridiculous, but the UG-115(b) says that.

In Addendum 2009b of ASME Section VIII Division 1, this last sentence which begins "however", was removed. Therefore, you can use dual unit system. Nobody care it anymore.