<font color="0000ff">Are new B31.1 and B31.3 codes expected in 2002?</font>

The most recent edition of B31.1 was issued on Dec 10, 2001. I doubt if an addenda will be published before Dec 2002.

The most recent edition of B31.3 is dated April 30, 2002.

For B31.3, I understand that yearly addenda will no longer take place. Instead, the code will be republished every two years.

<font color="0000ff">Are there any changes from a "stress analysis "point of view?</font>

B31.1
Yes. The new code has changed the expansion coefficients. Additionally, "code case 173" allows alternate allowable stress values.

B31.3
While I have not studied this new edition in depth, the changes do not appear to affect things from a "stress analysis" point of view.