API 650

Question 1

AST fabricated to API 650 is normally designed not to exceed an operating temperature of:,,,,,,,,,,

Answer 1

93 C or (200 F)

Question 2

2. Minimum size of fillet welds in the construction or repairs of an AST built to API Standard 650 is:
   On plates 5 mm (3/16 in.) thick………….
   plates more than 5 mm (3/16 in.) thick,,,,,,,,,,,,

Answer 2

• full fillet weld

- fillet weld thickness shall not less than 1/3 of thinner plat and shall be 5 mm (3/16”)

Question 3

3. As per API Standard 650, the overlap at lap-welded joints shall be at least five times the nominal thickness of the thinner plate, but need not exceed,

Answer 3

1” for single-welded lap joints

2” for double welded lap joints

Question 4

Single-welded lap joints are permissible only on ,,,,,,,,,,,,,,,

Answer 4

bottom plates and roof plates.

Question 5

Calculation of Design Thickness by the 1-Foot Method shall not be used for tanks ,,,,,,,,,,,,,,

Answer 5

• larger than 61 m

- (200 ft) in diameter

Question 6

Vertical joints in adjacent shell courses shall ,,,,,,,,,, but shall be offset from each other a minimum,,,,,,,,

Answer 6

not be aligned,

distance of 5t

Question 7

In an AST built to API Standard 650, the bottom annular plates have radial weld joints, and are single butt welded with permanent back-up bar, in which case, the extent of radiography of radial joints shall be,

Answer 7

one spot radiograph shall be taken on 50 % of the

radial joints

Question 8

Personnel who perform and evaluate radiographic examinations according to this section shall be qualified and certified by the Manufacturer as meeting the requirements of certification as generally outlined in ,,,,,,

Answer 8

Level II or Level III of ASNT SNT-TC-1A

Question 9

Per API 650, calculation of shell thickness by the 1-foot method cannot be used for tanks:

Answer 9

larger than 61 m (200 ft) in diameter.

Question 10

API 650 applies only to tanks whose entire bottom is uniformly supported and to tanks in ,,,,,,,,,,,, service that have a maximum design temperature of ,,,,,,,,,,,,,

Answer 10

non-refrigerated

93 °C (200 °F) or less

Question 11

API 650 code is tank construction code for

Answer 11

approximating atmospheric pressure

Question 12

Bottom Plates:

All bottom plates shall have a corroded thickness of not less than ,,,,

Answer 12

5 mm (3/16 in.)

Question 13

Bottom Plates:

The terms “Sketch plates” and “annular plates” refer to Plates in :

Answer 13

Tank bottom

Question 14

Bottom Plates:
all rectangular and sketch plates (bottom plates on which the shell rests that have one end rectangular) shall have a nominal width of ,,,,,,,,,,,,,,

Answer 14

not less than 1800 mm (72 in.).

Question 15

Bottom Plates:
Plates of sufficient size shall be ordered so that, when trimmed, at least a ,,,,,,,,,,,,width will project outside the shell

Answer 15

50 mm (2 in.)

Question 16

Bottom Plates:
Unless otherwise specified on the Data Sheet, Line 12, tank bottoms requiring sloping shall have a minimum
slope of ,,,,,,,,,,,,,upwards toward center of the tank

Answer 16

1:120

Question 17

Hydrostatic testing of tank shells is:

Answer 17

Basically water fill test

Question 18

Internal inspection of tanks during shut-down is essentially for inspection of:

Answer 18

Tank bottom

Question 19

During tank inspection, the inspector should be more strict while inspecting:

Answer 19

The shell vertical welds

Question 20

Since the tank is neither a pressure vessel, nor the piping, the welding procedures and welders for API 650 tanks are qualified as per:

Answer 20

ASME IX

Question 21

,,,,,,,,,,,,,,, is/are mandatory appurtenances for Storage tanks

Answer 21

Tank vents

Question 22

API 650 covers:

Answer 22

Cylindrical, welded, above ground tanks only

Question 23

Maximum design internal pressure in an AST referred to by API 650 and API 653 is

Answer 23

Not exceeding 2.5 psig

Question 24

Design Metal Temperature*: Enter either lowest 1-day mean temperature plus ………….

Answer 24

8 ºC (15 ºF)

Question 25

In an AST built to API Standard 650, the minimum nominal thickness of bottom plates, exclusive of specified corrosion allowance shall be:

Answer 25

6.0 mm (1/4”)

Question 26

The full course width for shell plate as per API 650 shall be minimum:

Answer 26

1800 mm (72 in.)

Question 27

Reinforcement pads shall be tested by applying pressure between the tank shell and reinforcement plate using the telltale hole. How much pressure is used to perform this inspection?

Answer 27

15 psig pneumatic pressure

Question 28

Each reinforcing plate for shell openings shall be provided with a ,,,,,,,,,,,,,diameter telltale hole

Answer 28

6 mm (1/4 in.)

Question 29

Each edition, revision, or addenda to this API Standard becomes effective ……….months after the date of issuance for equipment that is certified as being constructed, and inspected per this Standard

Answer 29

six