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Interpretation: VIII-77-43

Subject: Section VIII, Division 1, Radiography of Formed Heads

Date Issued: April 25, 1977

File: NA

Question: For cold formed heads to be used in Section VIII, Division 1 vessels and where

radiography of the weld seams in the head is required, what are the requirements for the appropriate

sequence of cold forming and radiography?

Reply: Section VIII, Division 1 does not contain any specific requirements pertaining to the

sequence of radiography and cold forming of heads required to be radiographed. Therefore, it is up to

the vessel manufacturer to use his judgment for such an application.


Subject: Section VIII, Division 1, U-1, Classification of Sterilizers


File: BC76-187

Question: What Code requirements apply to a sterilizer of 9 in. I.D. which generates steam for

internal use only and which is heated by a strip heater mounted on the outside?

Reply: Such a sterilizer is within the scope of Section VIII, Division 1. It could be built under

the provisions of U-1(j) as a "UM" vessel. The sterilizer is not an unfired steam boiler or a fired pressure

vessel, so the requirements of UW-2(c) or (d) are not mandatory.

However, we caution you that the laws at the point of installation may dictate the

construction. As indicated by footnote 1 to U-1, Scope, such laws must be reviewed to determine

requirements that may be different or more restrictive than the Code rules.

Interpretation: VIII-77-45Subject: Section VIII, Division 1, U-1, Classification of Autoclaves


File: BC76-187

Question: What Code requirements apply to an autoclave of 6 in. I.D. which generates steam for

internal use only and which is heated by a strip heater mounted on the outside?

Reply: Such an autoclave is not within the scope of Section VIII, Division 1 when the inside

diameter does not exceed 6 in. [See U-1(c)(9)]. However, if desired, such an autoclave could be

constructed in accordance with Section VIII, Division 1 rules [See U-1(i)]. The mandatory rules are not

influenced by the location of the heater. The autoclave is not an unfired steam boiler or a fired pressure

vessel, so the requirements of UW-2(c) or (d) are not mandatory.However, we caution you that the laws at the point of installation may dictate the

construction. As indicated by footnote to U-1, Scope, such laws must be reviewed to determine

requirements that may be different or more restrictive than the Code rules.


Subject: Section VIII, Division 1, U-1, Classification of Autoclaves


File: BC76-518

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