Angle alpha interpretation:
Standard Designation: BPV Section VIII Div 1
Edition/Addenda: 2013
Para./Fig./Table No: UW-9
Subject Description: Section VIII, Division 1; UW-9(c) - Change in Wall Thickness
Date Issued: 03/24/2016
Record Number: 16-464
Interpretation Number : BPV VIII-1-16-25
Question(s) and Reply(ies):
Question: Does UW-9(c) require a 3:1 taper when there is a change in wall thickness within a shell course or spherical shell even when that change in thickness is away from a welded joint?
Reply: Yes, see UG-27(g).
, but since you are looking specifically at UW-9-2:
Standard Designation: BPV Section VIII Div 1
Edition/Addenda:
Para./Fig./Table No:
Subject Description: UW-9(c) and Fig. UW-16.1(g) (2007 Edition, 2009 Addenda)
Date Issued: 11/23/2010
Record Number: 10-749
Interpretation Number : VIII-1-10-31
Question(s) and Reply(ies):
Question (1): For a vessel constructed in accordance with Section VIII, Division 1, is it permissible to weld a welding neck flange (that is included within the scope of the Code) to the neck of an integrally reinforced nozzle similar to that depicted by Fig. UW-16.1(g)?
Reply (1): Yes.
Question (2): If the reply to question (1) is "yes," do the requirements of Fig. UW-13.4 apply to the transition between the nozzle neck and flange?
Reply (2): No. See UW-9(c).
also see Figure UW-16.1(g)
for the heat exchanger question:
Google heat exchanger nameplates and look at some of the images. The nameplates have a shell side and tube side so both conditions can be added to the nameplate
