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API 650 10TH EDITION ERRATA
Section Page Change
2.2.2 h 2-2 Sentence should read: ASTM A 633M/A 633, Grades C and D, for plates to a maximumthickness of 45 mm (1.75 in.) [insert plates to a maximum thickness of 40 mm (1.5 in.)].
Table 2-3a 2-6 The following corrections should be made for the material group grades in SI units shouldread:
Group VI – A 537M Class 1, A 537M Class 2
Footnote #6 should be revised to read:
6. Manganese content shall be 0.8–1.2% by heat analysis for thicknesses greaterthan 20 mm, except that for each reduction of 0.01% below the specified carbonmaximum, an increase of 0.06% manganese above the specified maximum willbe permitted up to the maximum of 1.35%. Thicknesses < 20 mm shall have amanganese content of 0.8–1.2% by heat analysis.
Table 2-3b 2-7 The following corrections should be made for the material group grades in U.S. Customaryunits should read:
Group III – A 573-58, A 516-55, and A 516-60Group IIIA – A 573-58, A 516-55, and A 516-60Group IV – A 573-65, A 573-70, A 516-65, and A 516-70Group IVA – A 573-70Group V – A 573-70, A 516-65, and A 516-70Group VI – A 537 Class 1, A 537 Class 2
Footnote #6 should be revised to read:
6. Manganese content shall be 0.8–1.2% by heat analysis for thicknesses greaterthan 0.75 in., except that for each reduction of 0.01% below the specified carbonmaximum, an increase of 0.06% manganese above the specified maximum willbe permitted up to the maximum of 1.35%. Thicknesses < 0.75 in. shall have amanganese content of 0.8–1.2% by heat analysis.
3.6.2.3 3-7 The last sentence in the section should read: This design may only be used for tanks withshell thicknesses less than or equal to 12.5 mm (½ in.).
3.6.3.2 3-7 The equation for the hydrostatic test shell thickness in U.S. Customary units should read:
Table 3-2 3-8 The minimum tensile strengths for ISO 630 should read: 425 (61,900) and 490a (71,000a).
Table 3-2 3-8 The following material should be added to the table:
Plate Grade Min Yield Min. Tensile Design Hydro. TestSpecification Strength Strength Stress Stress
A 841M 345 (50,000) 485a (70,000a) 194 (28,000) 208 (30,000)
( )t
t S
HDt
16.2 −=
Last updated on 6-7-99
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Section Page Change
3.6.4.4 3-9 The equation for bottom-course thicknesses for the design (t1d) and hydrostatic test (t1t)conditions in SI units should read:
3.6.4.5 3-9 If the value of the ratio is greater than or equal to 2.625, then t2 = t2a
3.6.4.7 3-10 The equation for the minimum thickness of upper shell courses for both the design condition(tdx) and the hydrostatic test condition (ttx) in SI units should read:
The equation for the minimum thickness of upper shell courses for hydrostatic test condition(ttx) in U.S. Customary units should read:
Figure 3-4 B 3-15 All references to Table 3-9 in the body of the figure should read: Table 3-7
3.7.4.1 3-17 The second sentence should read: The stress relief shall be carried out within atemperature range of 600ºC to 650ºC (1100ºF to 1200ºF) (see 3.7.4.3 for quenched andtempered materials) for 1 hour per 25 mm (1 in.) of shell thickness.
Table 3-6 3-18 Column 8 should read: Regular Typed
3.7.6.2 3-23 The third sentence should read: In addition, nozzles not larger than NPS 3 – for theinsertion of thermometer wells, for sampling connections, or for other purposes notinvolving the attachment of extended piping – may be installed at an angle of 15 degreesor less off perpendicular in a vertical plane without modification of the nozzlereinforcing plate.
3.9.7.2 a 3-42 The term for the as ordered thickness of the top shell course should read: tunifrom
( ) 5.01
1
tr
h
CAS
GDH
S
GH
H
Dt
ddd +
−=
9.40696.006.11
−=
ttt S
DH
S
H
H
Dt
9.40696.006.11
CAS
Gx
HD
td
dx +
−
=1000
9.4
ttx S
xHD
t
−
=1000
9.4
ttx S
xHD
t
−
=12
6.2
Last updated on 6-7-99
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yF
EcC
22π=
Section Page Change
3.9.7.6.2 3-44 The equation for the section modulus of the intermediate wind girder should read:
In SI units:
13.4 (D t) 0.5
where
D = nominal tank diameter (m)t = shell thickness at the attachment (mm)
In U.S. Customary units:
1.47 (D t) 0.5
where
D = nominal tank diameter (ft)t = shell thickness at the attachment (in.)
3.10.3.4 3-47 The formulas for allowable compression should read:
where
When l / r exceeds Cc
( )
( ) ( )
−
−+
−
=
r
lcC
rl
cC
rl
yF
cC
rl
aF
2006.1
38
3/
8
/3
3
5
22
2/1
( )
−
=
r
l
rl
E
aF
2006.1
2/23
212 π
Last updated on 6-7-99
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.in163
sin400 thicknessMinimum ≥=
θD
Section Page Change
3.10.5.1 3-48 The maximum thickness for self-supported cone roofs in SI units should read:
Maximum thickness = 12.5 mm, exclusive of corrosion allowance
The formula for minimum thickness in U.S. Customary units should read:
Maximum thickness = ½ in., exclusive of corrosion allowance
5.4.4 5-4 The first sentence should read: Repairs of defects discovered after the tank has been filledwith water for testing shall be made with the water level at least 0.3 m (1 ft) below anypoint being repaired or, if repairs have to be made on or near the tank bottom, with thetank empty.
5.5.5.2 c 5-5 The first sentence should read: Where a concrete slab foundation is provided, the first0.3 m (1 ft) of the foundation (or width of the annular ring), measured from the outside ofthe tank radially towards the center, shall comply with the concrete ringwallrequirement.
6.1.2.2 c 6-1 The first sentence should read: Vertical joints in which the shell plates are greater than25 mm (1 in.) thick shall be fully radiographed.
6.1.2.4 6-1 The section should read: When two or more tanks are erected in the same location for thesame purchaser, either concurrently or serially, the number of spot radiographs to betaken may be based on the aggregate length of welds of the same type and thickness ineach group of tanks rather than the length in each individual tank.
Figure 6-1 6-2 Note #2 should read: Horizontal spot radiograph in accordance with 6.1.2.3: one in thefirst 3 m (10 ft) and one in each 60 m (200 ft) thereafter.
6.5.1 c 6-4 The section should read: The frequency of surface porosity in the weld does not exceed onecluster (one or more pores) in any 100 mm (4 in.) of length, and the diameter of eachcluster does not exceed 2.5 mm (3/32 in.).
8.1.1 j 8-1 The section should read: The maximum operating temperature, in degrees Celsius(Fahrenheit) (unless other units are specified by the purchaser), which shall not exceed90ºC (200ºF) except in cases where Appendix M applies.
Last updated on 6-7-99
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Section Page Change
E.5.3 E-7 The first sentence should read: The maximum longitudinal compressive stress in the shell,b/1000t (b/12t), shall not exceed the maximum allowable stress, Fa, determined by thefollowing formulas for Fa, which take into account the effect of internal pressure due tothe liquid contents.
The equation for the maximum allowable shell compression when GHD2/t2 is less than 44,should read:
In SI units:
In U.S. Customary units:
F.4.2 F-4 The equation for the maximum design pressure for tanks with small internal pressures shouldread:
In SI units:
PW
Dt
M
Dhmax
..
.= + −
0 001270 08
0 003822 3
where
Pmax = maximum design pressure (kPa),
W = total weight of the shell and any framing (but not roof plates) supported by the shell androof (N),
M = wind moment (N-m).
In U.S. Customary units:
32max735.0
8245.0
D
Mt
D
WP h −+=
where
Pmax = maximum design pressure (in. of water),
W = total weight of the shell and any framing (but not roof plates) supported by the shell androof (lbf),
M = wind moment (ft-lbf).
H.6.2.2.1 H-4 The third sentence should read: The total open area of these vents shall be greater than orequal to 0.6 m2/m (0.2 ft2/ft) of tank diameter.
I.5.1 I-3 The first sentence should read: The minimum thickness of flexible-membrane leakbarriers shall be 800 µm (30 mils) for fiber-reinforced membranes and 1000 µm (40 mils)for unreinforced membranes.
GHD
FF
tya 5.7
5.2
83+=
GHD
FF
tya 600
5.2
106
+=
Last updated on 6-7-99
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Section Page Change
Table S-3 S-5 The allowable stress for 304L at 40ºC (100ºF) (second column) should read: 117 (16,700).
S.4.10.1 e S-7 The sentence should read: Water temperature shall be below 50ºC (120ºF).
