Quiz 5

Upon cooling from temperatures of 750-1000F, normally ductile ferritic chrome steels in the 400 stainless-steel groups have reduced toughness under about 200F. The problem here is currently known as:

• graphitization

• incipient melting

• 885F embrittlement

• decarburization

A materials engineer is performing a failure analysis on an integral-finned heat exchanger tube made of 300 series stainless steel. The tube is from a reformer unit. The fins were cold-worked and the tubes were not subsequently annealed. The tub leaked due to a circumferential crack. The cracking mode is noted to be trans-granular, branched cracking. Which of the following was most likely responsible for the failure?

• Metal fatigue cracking

• Chloride-induced stress corrosion cracking

• Polythionic acid cracking

• Hydrogen-induced cracking

Gamma-ray radiography is used to perform inspection on a repair weld of a vessel that is 1.250 inches (31.8 mm) thick. The radiographer has access to both sides of the weld. The hole-type IQI (penetrameter) is:

• 10

• 20

• 30

• 40

The inspector is reviewing radiographs of a repair weld of 1.250-inch (32 mm) plate for a vessel stamped RT-1. What is the maximum allowable continuous length of slag (elongated indication)?

• 0.312inch (8mm)

• 0.333inch (8.5mm)

• 0.417inch (10.6mm)

• 0.750inch (19mm)

A vessel with an inside diameter of 54 inches (137 cm) has a corroded area of considerable size in which circumferential stresses govern. Along the most critical element of the area, the smallest measured thickness may be averaged over a length of no more than:

• 18 inches (46 cm)

• 20 inches (50 cm)

• 27 inches (69 cm)

• 40 inches (102 cm)

In what years were Nichole's brothers born?

• '83 and '84

• '84 and '85

• '82 and '83

• '85 and '86

The following Charpy weld metal test results for a welding procedure qualification record are to be reviewed for acceptance: minimum yield strength of test coupon material = 45,000psi and thickness = 1.5 inches. Which of the following test results, in foot pounds, would meet the minimum impact strength required by ASME Code, Section VIII, Division 1?

• 18, 11, 20

• 19, 9.5, 22

• 19, 10, 15

• 17, 11, 15

On occasion, it may be desirable to enter a pressure vessel before it has been properly cleaned to search for internal causes of poor operation. The inspector should exercise special precautions for such entry as given in:

• API Publication 2217A

• API Publication 2214

• API Recommended Practice 579

• OSHA 1910 regulations

During the repair of a pressure vessel, a seamless ellipsoidal head is replaced. The nameplate is stamped RT-2. The replacement head is attached using a single welded but joint with a backing strip that will be left in place. One welder performed the weld. What is the joint type for the head to shell weld?

• 1

• 2

• 3

• 4

When a direct-current magnetic yoke is checked for lifting power, it must be capable of lifting at least how many pounds at maximum pole spacing?

• 10 pounds

• 20 pounds

• 30 pounds

• 40 pounds