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21.4.4 Manufactured Pipe
The dimensional tolerances for pipe manufactured to a specification shall be in accordance with the applicable specification, e.g. ANSI/API 5L, ASTM 106, BS 7191, or prEN 10225. For pipe diameters 600 mm (24") or greater, the straightness and roundness of manufactured pipe shall be in accordance with API Specification 2B
21.4.5 Beams
Deck beams shall be erected with the top flanges level, or to the specified slope within allowable mill tolerances. Deck beams shall be erected with the webs plumb. Distortion of deck beams from welding shall be corrected or otherwise compensated so that the tolerances of this paragraph are met.
Cap beams shall be erected with the top flanges level. Disparity in beam depth due to mill tolerances in depth shall be compensated by shimming between the cap beam and column. Cap beams shall be erected with the webs plumb. Distortion of cap beams from welding shall be corrected or otherwise compensated so that the tolerances of this paragraph are met.
21.4.6 Cruciform Joints
Where plates carrying in-plane loading are arranged to form a cruciform, the misalignment shall not exceed 50 % t where t = thickness of the thinnest non-continuous member to 10 mm whichever is smaller.
Joint misalignment in fabricated tubulars and rectangular beams shall be in accordance with fit up dimensions applicable to the qualified welding procedures and Figure 21.4-23.
Table 21.4-1 Global Tolerances
Component / Item Tolerance mm (inches)
See Figure
DECK AND JACKET TOLERANCES
Ja-Da Horizontal distance centre-to-centre between adjacent legs at top of jacket and bottom of deck legs (stab in nodes)
10 ( 3/8") 21.4-1
Jb-Db Horizontal distance centre-to-centre between legs other than top elevation
20 (3/4") 21.4-1
Jc-Dc Difference of horizontal diagonal distances between legs 10 (3/8") (stab in) 20 (3/4")
21.4-1
Jc-Dc Elevation of plan 13 (1/2) 21.4-2 Jd -Dd Vertical level of braces in a horizontal plane 13 (1/2) 21.4-2 Je-De Vertical distance between elevations 13 (1/2) 21.4-2 Jf-Df Deviation from theoretical conductor guide centre line axis (line
from top to bottom elevation) and each conductor guide along that axis
10 (3/8") at top; 10 (3/8"
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Component / Item Tolerance mm (inches)
See Figure
(1/8" x (Total ft/10), not to exceed 3/8" in 40 feet
Jk-Dk Straightness of jacket legs between horizontal bracing plans 10 (3/8") 21.4-2 Jk-Dk Location of different wall thickness for braces 50 (2") 21.4-6 Jl-Dl Alignment of brace end chord, or structural member work
points 13 (1/2) 21.4-7
Jm-Dm Elevation at top of legs as compared to theoretical 13 (1/2) Jn Global pile guide centre line location at each elevation (applies
to pile guide sleeves) 10 (3/8") at top; 10 (3/8") 3 500, Jm = 10 mm
J = 10 minutes
21.4-13
Jw Global Positioning Tolerance for Tubular Nodes Radius of Sphere of error = 15
21.4-24
DECK
Dn Position of all beam centre lines 13 (1/2) V; 20 (3/4") H
21.4-9
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Component / Item Tolerance mm (inches)
See Figure
Do Horizontal distance between skid beams 10 (3/8") Dp Straightness of cap beams (See "DL" For Work points) 6 (1/4") V;
10 (3/8") H
Dq Elevation difference of work points on bottom of deck legs to each other for deck to pile connections.
13 (1/2)
Dr Elevation difference of work points on bottom of deck legs to each other for deck to jacket connections
6 (1/4")
Ds Vertical alignment of girders 13 (1/2) Dt Tolerance on stab in points for deck to jacket connections
without deck legs 3 (1/8") 21.4-25
Du Plate girder cross section depth = 0,12 t, 5 max flange width = 3 Due=0,015b, 5 max Duf=0,0125b, 10 max Dup=3 Duw=0,008h, 10 max
21.4-17
Dv Plate and box girder out-of-straightness, camber and sweep sweep = +0,001L, +15 max
camber = -0
21.4-18
Dw Plate girder stiffener a, p, and s = 5 21.4-19 Dx Box girder Diagonal = 0,005 g, 7
max;
Twist = 0,008h, 10 max w=0,008h, 10 max
21.4-20
Dy Node lengths on girders -0 +10 21.4-21
Dz Stiffened plate panels, entire panel, lateral sagging or hogging between girders = 0,015L, 20 max; between stiffeners = 0,01L1, 10 max
21.4-22
Dz Stiffened plate panels, stiffeners a and p = 5 s = 0,015L1, 5 max
21.4-22
Fencing and Handrails Stanchions
12 (1/2) in any 3m (10 ft)
5 (1/4) from vertical
PILES
Pa Straightness in 10 feet;
Straightness in 40 feet 3 (1/8"); 10 (3/8")
-
Pb Straightness greater than 40 feet 3 x (Total m/3) -
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Component / Item Tolerance mm (inches)
See Figure
(1/8" x (Total ft/10)
or L/960
MISCELLANEOUS
Ma Landing and stair elevations 50 (2") Mb Vertical distance between stair treads in one flight 3 (1/8") Mc Levelness of stair treads 3 (1/8") Md Horizontal locations of stairs and landings 50 (2") Me Location of anodes 300 (12")
10 Radially
Mf Levelness of deck floor plate and grating 6 (1/4") in 3000 (10 ft) Mg High/low of deck floor plate 3 (1/8") Mh Valleys in deck floor plate 12 max (1/2")
Mi Separation between adjoining longitudinal welds for tubular 90 minimum Mj Minimum Stagger between joint can longitudinal welds (only to
avoid brace member interference.) 300 (12") 21.4-10
Mk Minimum clearance between chord longitudinal welds and brace stub longitudinal welds
30 off centre line of Cord Longitudinal
21.4-10
Ml Minimum clearance between chord girth welds and longitudinal welds of brace stub ends
150 (6") 21.4-10
Mm Minimum clearance between tubular girth welds 915 (3 ft) of 1 OD
Mn Joint mismatch tolerance, rectangular, all thickness (except skid beams)
12 % t, but not >5 mm 21.4-23
Mn Joint mismatch tolerance, circular and long seams double sided welds: 10 % t not >6 mm
Single sided welds: 10 % t not >3 mm
21.4-23
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Figure 21.4-1
Figure 21.4-2
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Figure 21.4-3
Figure 21.4-4
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Figure 21.4-5
Figure 21.4-6
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Figure 21.4-7
Figure 21.4-8
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Figure 21.4-9
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Figure 21.4-10
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Figure 21.4-11
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Figure 21.4-12
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Figure 21.4-13
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Figure 21.4-14
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Figure 21.4-15
Figure 21.4-16
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Figure 21.4-17
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Figure 21.4-18
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Figure 21.4-19
Figure 21.4-20
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Figure 21.4-21
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Figure 21.4-22
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Figure 21.4-23
Figure 21.4-24
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Figure 21.4-25
Figure 21.4-26
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A.21 Fabrication
No guidance is offered.
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