650 API 653 -SECTION 650 WITH
QUESTIONS AND ANSWERS
API 650 covers material, design, fabrication, erection and testing requirements for aboveground welded
steel storage tanks. Internal pressure allowed for these tanks approximates atmospheric pressure.
However, the internal pressures mus not exceed what criteria? - ANSWER✔✔✨---The weight f the
roof plates (1.1.1)
What is the maximum temperature permissible for a 'standard tank' covered by API 650, unless
additional requirements of appendix M of API 650 are followed? - ANSWER✔✔✨---200F (1.1.1)
Appendix A provides alternative simplified design requirements for tanks where the stressed
components, such as shell plates and reinforcing plates. They are limited to a maximum nominal
thickness of what (inches)? - ANSWER✔✔✨---1/2" (1.1.7)
Who is responsible for complying with all of the provisions of API 650 when a new tank is built? -
ANSWER✔✔✨---The manufacturer (1.3)
Required sections of this Standard become mandatory if the Standard has been adopted by _________ -
ANSWER✔✔✨---Legal jusrisdiction (3.11)
The lowest tempreature considered in the design shall be assumed to be how many degrees Farenheit
above the lowest one-day mean ambient temperature of the locality where the tank is to be installed? -
ANSWER✔✔✨---15F (3.4)
Material used to construct a tank shall conform to the specifications of API 650. May other material be
used? - ANSWER✔✔✨---Yes, provdied that the material is certified to meet all the requirements of
an applicable material spec listed in 650 and it is approved by the buyer. (4.1.2)
, Shell plates for API 650 tanks are limited to what maximum thickness? - ANSWER✔✔✨---1.75"
(4.2.1.4)
A tank is to be fabricated using ASTM A283 Grade C 'killed' material. The maximum thickness of the
lower two course plates is 3/4". The tank is to be constructed in Las Vegas, NV. What Minimum Design
Temperature could be used without impact testing? - ANSWER✔✔✨---35F (3.4) and (Fig 4.2)
An impact specimen is removed from a 1.25" thick ASTM A516 Grade 55 plate. Three impact tests are
taken from the specimen. What average longitudinal impact value must the test meet? -
ANSWER✔✔✨---15ft-lb (Tab 4.5b)
Who specifies the design metal temperature, the design specific gravity, the corrosion allowance (if any)
and the design wind velocity for the AST? - ANSWER✔✔✨---The purchaser (5.2.2)
A tank is buit from ASTM A537M 1 (C-Mn-Si) normalized, quenched and tempered, killed fine-grain,
reduced carbon and TMCP steel. The welding is done by an automatic process. The purchaser requires
hardness testing of the welds. The tank diameter is 19.1M. How many (if any) hardness test(s) will be
required for one circumferential weld? - ANSWER✔✔✨---One every 30m.
(19.1*pi) = 60m, 2 hardness tests.
(5.3.3.4)
A new AST is built. How far should the bottom sketch plates project beyond the outside of the shell weld
attaching the bottom to the shell plate? (These are not annular plates) - ANSWER✔✔✨---2"
(5.4.2)
Annular bottom plates shall have a radial width that provides at least how many inches between the
inside of the shell and any lap-welded joint in the reminder of the bottom? - ANSWER✔✔✨---24"
(5.5.2)
An AST is to be designed using API650. The tank is to be 50ft diameter and 16ft high (two 8ft courses).
No corrosion allowance is required. The stored liquid in the tank is a non-corrosive oil with a 0.90
specific gravity. The material is ASTM A285 C. What is the required thickness of the bottom shell course?
- ANSWER✔✔✨---?
QUESTIONS AND ANSWERS
API 650 covers material, design, fabrication, erection and testing requirements for aboveground welded
steel storage tanks. Internal pressure allowed for these tanks approximates atmospheric pressure.
However, the internal pressures mus not exceed what criteria? - ANSWER✔✔✨---The weight f the
roof plates (1.1.1)
What is the maximum temperature permissible for a 'standard tank' covered by API 650, unless
additional requirements of appendix M of API 650 are followed? - ANSWER✔✔✨---200F (1.1.1)
Appendix A provides alternative simplified design requirements for tanks where the stressed
components, such as shell plates and reinforcing plates. They are limited to a maximum nominal
thickness of what (inches)? - ANSWER✔✔✨---1/2" (1.1.7)
Who is responsible for complying with all of the provisions of API 650 when a new tank is built? -
ANSWER✔✔✨---The manufacturer (1.3)
Required sections of this Standard become mandatory if the Standard has been adopted by _________ -
ANSWER✔✔✨---Legal jusrisdiction (3.11)
The lowest tempreature considered in the design shall be assumed to be how many degrees Farenheit
above the lowest one-day mean ambient temperature of the locality where the tank is to be installed? -
ANSWER✔✔✨---15F (3.4)
Material used to construct a tank shall conform to the specifications of API 650. May other material be
used? - ANSWER✔✔✨---Yes, provdied that the material is certified to meet all the requirements of
an applicable material spec listed in 650 and it is approved by the buyer. (4.1.2)
, Shell plates for API 650 tanks are limited to what maximum thickness? - ANSWER✔✔✨---1.75"
(4.2.1.4)
A tank is to be fabricated using ASTM A283 Grade C 'killed' material. The maximum thickness of the
lower two course plates is 3/4". The tank is to be constructed in Las Vegas, NV. What Minimum Design
Temperature could be used without impact testing? - ANSWER✔✔✨---35F (3.4) and (Fig 4.2)
An impact specimen is removed from a 1.25" thick ASTM A516 Grade 55 plate. Three impact tests are
taken from the specimen. What average longitudinal impact value must the test meet? -
ANSWER✔✔✨---15ft-lb (Tab 4.5b)
Who specifies the design metal temperature, the design specific gravity, the corrosion allowance (if any)
and the design wind velocity for the AST? - ANSWER✔✔✨---The purchaser (5.2.2)
A tank is buit from ASTM A537M 1 (C-Mn-Si) normalized, quenched and tempered, killed fine-grain,
reduced carbon and TMCP steel. The welding is done by an automatic process. The purchaser requires
hardness testing of the welds. The tank diameter is 19.1M. How many (if any) hardness test(s) will be
required for one circumferential weld? - ANSWER✔✔✨---One every 30m.
(19.1*pi) = 60m, 2 hardness tests.
(5.3.3.4)
A new AST is built. How far should the bottom sketch plates project beyond the outside of the shell weld
attaching the bottom to the shell plate? (These are not annular plates) - ANSWER✔✔✨---2"
(5.4.2)
Annular bottom plates shall have a radial width that provides at least how many inches between the
inside of the shell and any lap-welded joint in the reminder of the bottom? - ANSWER✔✔✨---24"
(5.5.2)
An AST is to be designed using API650. The tank is to be 50ft diameter and 16ft high (two 8ft courses).
No corrosion allowance is required. The stored liquid in the tank is a non-corrosive oil with a 0.90
specific gravity. The material is ASTM A285 C. What is the required thickness of the bottom shell course?
- ANSWER✔✔✨---?
