7/27/2019 CASO 2541.pdf

1/1

CASE

2541CASES OF ASME BOILER AND PRESSURE VESSEL CODE

Approval Date: January 19, 2006

The ASME Boiler and Pressure Vessel Standards Committee took action to

eliminate Code Case expiration dates effective March 11, 2005. This means that

all Code Cases listed in this Supplement and beyond will remain available for

use until annulled by the ASME Boiler and Pressure Vessel Standards Committee.

Case 2541

Use of Manual Phased Array Ultrasonic Examination

Section V

Inquiry: Under what conditions and limitations may

a phased array ultrasonic examination be utilized per

Section V, Article 4 when utilizing a single fixed beam

angle with manual aster scanning?

Reply: It is the opinion of the Committee that weldexaminations may be performed using a phased array

ultrasonic (PA-UT) technique utilizing a single fixed

beam angle with manual raster scanning provided that

Article 4 and the following additional requirements are

met:

(a) Amplitude Control Linearity checks shall be per-

formed on each pulser-receiver circuit in the ultrasonic

unit.

The Committees function is to establish rules of safety, relating only to pressure integrity, governing the construction of boilers, pressure vessels, transport tanksand nuclear components, and inservice inspection for pressure integrity of nuclear components and transport tanks, and to interpret these rules when questions ariseregarding their intent. This Code does not address other safety issues relating to the construction of boilers, pressure vessels, transport tanks and nuclear components,and the inservice inspection of nuclear components and transport tanks. The user of the Code should refer to other pertinent codes, standards, laws, regulations orother relevant documents.

1 (2541)PDF RELEASE SUPP. 9 BPV

(b) The focal law1 to be used during the examination

shall be used for calibration.

(c) In addition to the essential variables listed in Table

T-421, the following parameters shall be considered

essential variables:

(1) search unit type, element size and number, and

pitch and gap dimensions

(2) focus range (identifying plane, depth or sound

path as applicable)

(d) In addition to the items required to be recorded

per T-492, the following additional information shall be

recorded:

(1) search unit type, element size and number, and

pitch and gap dimensions

(2) focal law parameters, including angle, focal

depth, and elements used

(e) This Case number shall be shown on the Manufac-

turers Data Report.

1 Focal law is defined as a phased array operational file that definesthe search unit elements and their time delays for both the transmitter

and receiver functions.

raster