API 653 Sec-10 (Dismantling and Reconstruction) Flashcards
All reconstruction work must be authorized by the ……………experienced in
storage tank design, prior to commencement of the work by a reconstruction organization (see 3.23)
authorized inspector or an engineer
……………. in storage tank design shall approve all reconstruction work at the designated hold points and after reconstruction has been completed in accordance with the requirements
of this standard
The authorized inspector or an engineer experienced
The tank shall be ………….d prior to commencement of dismantling
cleaned and gas-free
Bottom plates that will be reused shall be cut by ……………. except where cuts cross existing weld seams
deseaming of lapwelds; or by cutting alongside of the
remaining welds at a minimum of 2 in. away from existing welds,
Any shell ring may be dismantled by cutting out……………….For the purpose of this method, the minimum HAZ to be removed will be …………, on both sides of the weld seam.
- existing weld seams and the heat affected zone (HAZ) of the weld
- 1/2 of the weld metal width or 1/4 in., whichever is less
Any shell ring ………… may be dismantled by cutting through the weld without removing the HAZ
1/2-in. thick or thinner
Shell rings may be dismantled by cutting vertical and/or horizontal cuts through the shell a minimum of …………. away from existing welds, except where cuts cross existing welds.
6 in.
Roof plates shall be cut by ………., or by cutting alongside of the ……………at aminimum of ……
deseaming of lap welds
remaining welds
2 in.
Shell, bottom, and roof plates shall be ………….. prior to dismantling for ready identification and placement
when the tank is reconstructed
marked
Marking material shall be of a ………….type
durable
A minimum of …… sets of matching center punch marks shall be located on the top and bottom edges of
each shell plate to facilitate proper alignment during reconstruction
two
New vertical joints in adjacent shell courses, made in accordance with 10.3.3.1, shall not be ………… but shall be offset from each other a minimum distance of …., where t is the plate thickness of the thicker course at the point of the offset
aligned
5t
No welding of any kind shall be performed when the temperature of the base metal is less than ……
0 °F
When the temperature of the base metal is between ……… or the thickness is in excess ….., the base metal within ….. of the place where welding is to be started shall be heated to a temperature ….. before welding.
0 °F and 32 °F of 1 in 3 in. warm to the hand (approximately 140 °F)
The edges of all welds shall ……..with the surface of the plate without a sharp angle
merge
Tack welds used in the assembly of vertical joints of tank shells shall be ………. and shall not …….. in
the finished joint when the joints are welded …,,….
removed
remain
manually.
When joints are welded by the …………… process, the tack welds shall be thoroughly cleaned of all welding slag but need …….. be removed
submerged-arc
not
Tack welds shall be made using a ………… procedure qualified in accordance with ……..
fillet-weld or butt-weld
Section IX of the ASME Code
Tack welds to be left in place shall be made by …………..
qualified welders.
If weldable primer coatings have been applied on surfaces to be welded, they shall be ……….. in welding
procedure qualification tests for the brand, formulation, and maximum thickness of primer applied
included
…………..electrodes shall be used for manual metal-arc welds, including the attachment of the ……………….
Low-hydrogen
first shell course to the bottom plates or annular plate ring,
…………….shal be used for all welds in shell courses over …… thick of API 650 Group……….matrials
Low-hydrogen electrodes
1/2-in
I – III materials;
………….for all welds in all shell courses of API 650 Group ………….materials
Low-hydrogen electrodes
IV – VI
Low-hydrogen electrodes shall be used for welding temporary and new permanent attachments to
shells of API 650 Group ……………. materials
IV, IVA, V, or VI
After the bottom plates are laid out and tacked, they shall be joined by welding the joints in a sequence that
results …………..from shrinkage and provides, as nearly as possible, a plane surface.
in the least distortion
The welding of the shell to the bottom (except for door sheets) shall be completed prior to the welding of
………….
bottom joints
Plates shall be held in close contact at all …………. during welding
lap joints
Plates to be joined by butt welding shall be matched ………….and retained in position during welding
accurately
Misalignment in completed vertical joints over 5/8-in. thick shall not exceed ………… of the plate thickness, with a maximum of ……..
10 %
1/8 in
Misalignment in joints 5/8-in. thick or less shall not exceed ,…………. and………….. joints shall be completed
before the lower horizontal weld is made.
1/16 in.
Vertical
In completed horizontal butt joints, the upper plate shall not project beyond the face of the lower plate at
any point by more than …………….of the thickness of the upper plate, with a maximum projection of …….., except that a projection of …….. is acceptable for upper plates less than …………thick.
20 %
1/8 in
1/16 in
5/16-in.
For horizontal and vertical joints in tank shell courses constructed of material over ………. thick (based
on the thickness of the thicker plate at the joint), multi-pass weld procedures are required, with no pass more than ……… thick permitted. A minimum preheat of ,,,,,,,,is required of these welds
1 1/2-in.
3/4-in
200 °F
Measurements to verify these tolerances shall be taken before the …………… test of the reconstructed
tank.
hydrostatic
The maximum out-of-plumbness of the top of the shell relative to the bottom of the shell shall not exceed ………..
of the total tank height, with a maximum of …….
1/100
5 in
The out-of-plumbness in one shell course shall not exceed the values specified for mill tolerances in
……….., whichever is applicable
ASTM A6 or ASTM A20
With a horizontal sweep board ………… long, peaking shall not exceed ………
36-in.
1/2 in
The sweep board shall be made to the true …………of the tank.
outside radius
With a vertical sweep board 36-in. long, banding shall not exceed ………
1 in.
where concrete ringwalls are provided under the shell, the top of the ringwall shall be level within …………. in any ……..of the circumference and within …… in the total circumference measured from the average elevation
±1/8 inches
30 ft
±1/4 inches
where concrete ringwalls are not provided, the foundation under the shell shall be level within ……… in any ……. of circumference and within . in the total circumference measured from the average elevation
±1/8 in
10 ft
±1/2 in
For foundations specified to be sloped from a horizontal plan, where concrete ringwalls are provided ……. in any ……….. of circumference and ……….. in the total circumference;
±1/8 inches
30 ft
±1/4 inches
For foundations specified to be sloped from a horizontal plan, where concrete ringwalls are not provided, ……..inches in any …… of circumference and . inches in the total circumference
±1/8
10 ft
±1/2
