Section 10 – Repairs & Alterations Flashcards
All crack-like flaws found during an inspection:
A. can be ignored if they are in lower stressed components.
B. must be repaired.
C. must be repaired in a manner that prevents the crack from reoccurring.
D. should be repaired unless they are deemed acceptable per a fitness-for-service evaluation.
D (10.2.2)
The seam on a riveted tank has started to leak. Which of the following is not an acceptable repair method?
A. Caulking
B. Epoxy coating after an abrasive blast
C. Re-riveted
D. Soldered
E. Welding
D (10.2.3)
The seam on a riveted tank has started to leak. The plan is to repair by welding. What must be part of the repair plan?
A. Caulk all rivets and seams within 6” of the welding
B. Replace all rivets within 12” of welding with bolts and gaskets
C. Use large weld beads
D. Welding should be done with the SAW process
A (10.2.3)
The seam on a riveted tank has started to leak. The plan is to repair by welding. What must be part of the repair plan?
A. Use large diameter electrodes
B. Set the welding machine for high amperage
C. Use back-step bead application
D. Weld with one pass
C (10.2.3)
On a riveted tank, some leaks have developed around a few rivet heads. Which of the following is a common problem when reforming weld repairs?
A. Welds often crack when welding older materials
B. Heat from welding can cause additional leaks in adjacent rivets
C. Welding rivet heads creates notches that are stress risers
D. It is difficult to inspect or test these fillet welds
B (10.2.3)
A tank floor is being replaced due to product-side corrosion. Currently the bottom-side of the tank is protected by CP. During this repair the:
A. shell should be slotted 6-12” above the old floor.
B. floor thickness should be increased to > 3/8”.
C. old floor should be removed.
D. concrete must be installed between the old and new floors.
C (10.2.4)
When locating a door sheet, which of the following is true?
A. Locate the door sheet in an area where the bottom is relatively level for a distance of 5 feet on either side of the door sheet.
B. Door sheets should not cut through any vertical welds.
C. Door sheets should not extend all the way to the bottom-to-shell weld.
D. Door sheets should not be wider than 10 feet.
A (10.2.5.1.a)
Cutting a door sheet all the way down to the bottom-to-shell weld:
A. is not allowed.
B. may end up requiring a hydrotest to be performed.
C. requires Owner/Operator approval.
D. always requires extra bracing to be installed.
B (10.2.5.1.c)
In liquid areas of the tank (shell & bottom) deep pits that are not closely spaced:
A. must be repaired by welding.
B. can be abrasive blasted and filled with air hardening epoxies.
C. can be repaired with either epoxies or soft patches.
D. can always be repaired with a fillet weld patch.
B (10.3.1)
Tanks repairs using soft patches are:
A. never allowed.
B. are acceptable repairs in all areas of the tank.
C. are acceptable repairs only externally on the roof.
D. are acceptable repairs only externally on the roof or shell.
C (10.3.2)
Soft patches on a tank roof should be clearly identified. Why?
A. So that more permanent repairs could be made in the future.
B. So that they can be removed and reinspected at each external inspection.
C. So that no one steps on them and gets mastic on their work boots.
D. So that no one steps on them and falls through the roof.
D (10.3.2)
