Question (1): A pressure vessel is constructed according to the rules of Section VIII, Division 1
using ERW pipe for the shell and seamless plate for the elliptical heads, which are welded to the
shell with a Type No. 1 weld per Table UW-12. All categories B and C butt welds are radiographed per UW-11(a)(5)(b). Is it required by UG-116(e) that the vessel be marked RT-2?

Reply (1): Yes.

Question (2): When calculating the head thickness of the pressure vessel described in Question
(1), per UG-32, is it permissible to use a value of E= 1.00?

Reply (2): Yes, provided the head is seamless or all category A welds in the head are fully
radiographed.

Question (3): When calculating the shell thickness of the pressure vessel described in Question
(1), per UG-27, is it permissible to use a value of E= 1.00?

Reply (3): Yes.

	Standard Designation:	BPV Section VIII Div 1
	Edition/Addenda:
	Para./Fig./Table No:
	Subject Description:	Section VIII, Division 1 (2001 Edition, 2002 Addenda); UW-11(a)(5)(b), UW-12, and UG-116
	Date Issued:	04/16/2003
	Record Number:	BC03-454
	Interpretation Number :	VIII-1-01-150
	Question(s) and Reply(ies):	Question (1): A pressure vessel is constructed according to the rules of Section VIII, Division 1 using ERW pipe for the shell and seamless plate for the elliptical heads, which are welded to the shell with a Type No. 1 weld per Table UW-12. All categories B and C butt welds are radiographed per UW-11(a)(5)(b). Is it required by UG-116(e) that the vessel be marked RT-2? Reply (1): Yes. Question (2): When calculating the head thickness of the pressure vessel described in Question (1), per UG-32, is it permissible to use a value of E= 1.00? Reply (2): Yes, provided the head is seamless or all category A welds in the head are fully radiographed. Question (3): When calculating the shell thickness of the pressure vessel described in Question (1), per UG-27, is it permissible to use a value of E= 1.00? Reply (3): Yes.