TIONS AND DETAILED ANSWER EXPLANATIONS | A+ STUDY RE-
Who is responsible for the rerating calculations of a Section Vlll Div. 1 vessel?
Answer
The manufacturer or an owner-user engineer (or his designated representative).
What is the maximum allowed time between the testing of pressure relieving devices per
API 510?
Answer
10 years.
If the requirements of API 510 are met who determines if a temporary fillet weld patch may
be used in a repair?
Answer
An engineer competent in pressure vessel design and the API authorized inspector.
The maximum carbon content of weldable steel per ASME Code is?
Answer
.35 %
Per API 510 what is the recommended shell temperature during a hydrostatic test of a vessel
1" thick?
Answer
10 ° F above MDMT.
1
,If you were looking for the last date that a pressure relief valve was set, where should this
information always be?
Answer
Relief valve's tag.
In what two ways may the probable corrosion rate for a new vessel be determined before
the first internal inspection?
Answer
From data collected on vessels providing the same or similar service or from published data
on vessels providing comparable service.
A vessel is to undergo a hydrostatic test after an alteration; the test pressure will be 785 psi.
Using standard commercially available gauges what is the minimum and maximum gage
pressure range acceptable for this test?
Answer
0-1500 to 0-3000 psi
Which of the following should a progressive record for a pressure vessel contain?
Answer
Construction and design information, operating and inspection history.
What must be considered important in the inspection of a metallic lining?
Answer
That there are no holes or cracks present in the lining.
If performing an external inspection of a vessel what consideration need be given the exter-
nal insulation?
Answer
2
, If insulation is in good condition and the vessel operates within the high and low tempera-
tures stated in API 510, removal of insulation is not necessary for inspection of the vessel.
What must be done prior to using special inspection procedures after an alteration to a ves-
sel in place of a hydrostatic test?
Answer
Make certain it is permitted by any jurisdictional rules that may exist and consult with an en-
gineer experienced in pressure vessel design and the Authorized Pressure Vessel Inspector.
If the corrosion rate of a vessel is determined to be less than a given amount per year, it is
possible to exempt the vessel from internal inspections. What is the value of the corrosion
rate that cannot be exceeded?
Answer
0.005" per year.
What may happen if vessels are subjected to temperatures above design?
Answer
Creep of the vessel's material may occur.
The definition of pressure vessels is;
Answer
A container designed to withstand internal or external pressure.
Which is the most severe stress caused by internal pressure in a cylindrical shell?
Answer
Circumferential stress acting along the longitudinal axis.
Of the following heads; which is normally required to be the thickest all things being equal?
Answer
3
Who is responsible for the rerating calculations of a Section Vlll Div. 1 vessel?
Answer
The manufacturer or an owner-user engineer (or his designated representative).
What is the maximum allowed time between the testing of pressure relieving devices per
API 510?
Answer
10 years.
If the requirements of API 510 are met who determines if a temporary fillet weld patch may
be used in a repair?
Answer
An engineer competent in pressure vessel design and the API authorized inspector.
The maximum carbon content of weldable steel per ASME Code is?
Answer
.35 %
Per API 510 what is the recommended shell temperature during a hydrostatic test of a vessel
1" thick?
Answer
10 ° F above MDMT.
1
,If you were looking for the last date that a pressure relief valve was set, where should this
information always be?
Answer
Relief valve's tag.
In what two ways may the probable corrosion rate for a new vessel be determined before
the first internal inspection?
Answer
From data collected on vessels providing the same or similar service or from published data
on vessels providing comparable service.
A vessel is to undergo a hydrostatic test after an alteration; the test pressure will be 785 psi.
Using standard commercially available gauges what is the minimum and maximum gage
pressure range acceptable for this test?
Answer
0-1500 to 0-3000 psi
Which of the following should a progressive record for a pressure vessel contain?
Answer
Construction and design information, operating and inspection history.
What must be considered important in the inspection of a metallic lining?
Answer
That there are no holes or cracks present in the lining.
If performing an external inspection of a vessel what consideration need be given the exter-
nal insulation?
Answer
2
, If insulation is in good condition and the vessel operates within the high and low tempera-
tures stated in API 510, removal of insulation is not necessary for inspection of the vessel.
What must be done prior to using special inspection procedures after an alteration to a ves-
sel in place of a hydrostatic test?
Answer
Make certain it is permitted by any jurisdictional rules that may exist and consult with an en-
gineer experienced in pressure vessel design and the Authorized Pressure Vessel Inspector.
If the corrosion rate of a vessel is determined to be less than a given amount per year, it is
possible to exempt the vessel from internal inspections. What is the value of the corrosion
rate that cannot be exceeded?
Answer
0.005" per year.
What may happen if vessels are subjected to temperatures above design?
Answer
Creep of the vessel's material may occur.
The definition of pressure vessels is;
Answer
A container designed to withstand internal or external pressure.
Which is the most severe stress caused by internal pressure in a cylindrical shell?
Answer
Circumferential stress acting along the longitudinal axis.
Of the following heads; which is normally required to be the thickest all things being equal?
Answer
3
