global tolerances

ISO/CD 19902

ISO 2001 All rights reserved 245

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"

ISO/CD 19902

246 ISO 2001 All rights reserved


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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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) -

ISO/CD 19902



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.

ISO/CD 19902


global tolerances

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