7/27/2019 864-23

1/1

Question 1: If a Material Manufacturer furnishes a plate to a Manufacturer of a vessel for Section

VIII, Division 1 Construction, and the plate has been sufficiently marked to identify the specification

number, is it necessary that the requirements of UG-10 be carried out for "Materials not fully identified"

if the Material Test Report or Certificate of Compliance has not been furnished?

Reply 1: If a material has been furnished in accordance with the above without the necessary

documentation, such as a Certified Material Test Report or Certificate of Compliance, it is only

necessary that the vessel Manufacturer obtain this documentation from the Material Manufacturer underthe guidance of his Authorized Inspector. Alternatively, the material might be qualified under the

provisions of UG-10.

Question 2: Is there any restriction in Section VIII, Division 1 as to whether a plate to be used in the

shell of the vessel must be rolled in the same direction as the shell is to be rolled?

Reply 2: No.

Interpretation: VIII-77-72

Subject: Section VIII, Division 1; UG-25(d) and UCS-25

Date Issued: August 12, 1977

File: BC76-614

Question: What is the intent of Section VIII, Division 1 with regard to the corrosion allowance

required by UG-24 and UCS-25 relative to an air-oil separator reservoir manufactured for a rotary screw

air compressor. The vessel contains both air and oil. Does the term "compressed air" in UCS-25 apply?

Reply: The present wording of UCS-25 of Section VIII, Division 1 does not exempt vessels with

a required minimum thickness of 1/4 in., or less that are to be used, in compressed air service, or

containing compressed air and oil, from the corrosion allowance provision of this paragraph, unless the

following conditions are met:

(1) The vessels are designed in accordance with UW-12(c) of the Code; or(2) The compressed air has had moisture removed to the degree that it has an

atmospheric dew point of -50F.

Interpretation: VIII-77-73

Subject: Section VIII, Division 1; UG-84(i)(3), Impact Test Requirements

Date Issued: August 16, 1977

File: BC77-338

Question 1: This concerns a single vessel requiring more than 400 ft of welding per weld procedure

and which has a wall thickness varying from 3/4 in. to 2 in. All welding will be done in the 1G position

and the welding is limited to joints of Categories A and B. Under the provisions of UG-84(i)(3)(a), is oneproduction impact test plate per weld procedure all that is required for a single vessel regardless of the

length of welding involved and variations in wall thickness?

Reply 1: Yes.

Question 2: UG-84(i)(3)(b) requires that for several vessels or parts of vessels welded within any 3

month period at one location, one test plate shall be made for each 400 ft of joints welded by the same

procedure provided the plate thickness does not vary by more than 1/4 in. or 25% and the same