$9\mathrm{.}5$ Example Problem $5$

A crack$-$like flaw has been found in the longitudinal seam on the inside surface of a cylindrical

pressure vessel during a scheduled turnaround. The vessel and inspection data are provided below.

The vessel was constructed to the ASME B&PV Code, Section VIII, Division $1,1998$ Edition.

Determine if the vessel is acceptable for continued operation.

Vessel Data

Material $=$ SA$-516$ Grade $70$ Year $1998$

Design Conditions

Inside Diameter

Fabricated Thickness

Uniform Metal Loss

FCA

Weld Joint Efficiency

PWHT

$=SA-516$ Grade $70$ Year $1998$

$=200$ psig@ $750F$

$=120\mathrm{.}0in$

$=1\mathrm{.}0in$

$=0\mathrm{.}0in$

$=0\mathrm{.}0in$

$=1\mathrm{.}0$

$=No$

Operating Conditions

The vessel is not fully pressurized until the temperature is $40F.$ Below this temperature, the startup

pressure remains under $100$ psig $.$ At shutdown, the pressure is decreased to $100$ psig before letting

the temperature drop below $40F.$

Inspection Data

The flaw is located in the HAZ of a longitudinal weld seam on the inside surface of the vessel. The

longitudinal seam is a double V$-$groove weld. The flaw is parallel to the weld seam. The depth of

the flaw was established by UT; consistent readings were noted and a final value for the flaw depth

was established at $0\mathrm{.}20$ in $.$ The flaw length was established by MT and is $3\mathrm{.}2$ in $.$ The distance of

the crack$-$like flaw to the nearest structural discontinuity is $30$ in $.$

Perform a Level $1$ Assessment per paragraph $9\mathrm{.}4\mathrm{.}2\mathrm{.}2$

First, check that the conditions to perform a Level $1$ Assessment are satisfied: See Example $9\mathrm{.}1$