Offshore Structure Platform Design - Offshore Structures: Design, Construction and Maintenance - page 206

note that the outer circle is not required if the D value is less than 22.2 m. The
centers of all the circles coincide with the center of the marking circle shown in
Figure 3.62 .

3.17 STRUCTURE ANALYSIS AND DESIGN QUALITY CONTROL
An offshore structure is complicated and not an easy structure to design, so it
requires many quality checks. One method is to use check lists to ensure that all
the factors are taken into account for design.
Table 3.19 is a check list for jacket in-place analysis and Table 3.20 is a
check list for topside in-place analysis.

TABLE 3.19 Check List for Jacket In-Place Analysis

Check
(yes/no)

Items Check Point

Computer Model

1 Framing dimensions according to the drawings or sketches

2 Framing elevations according to the drawings or sketches

3 Water depth and mud line elevation match the BOD

4 Member group properties: E, G, density match the BOD

(a) Section details, segment lengths, member offsets

(b) Corrosion allowance in splash zone

(c) Zero density for wishbone elements in ungrouted jackets

(d) Grout density corrections for grouted leg and pile

5 Member properties: Kx, Ky, Lx, Ly

6 Member end releases where applicable

7 Flooded members (legs, risers, J tubes, caissons, etc.)

8 Dummy members (relevant joints kept, rest deleted)

9 Plate/membranes modeled correctly

10 Boundary conditions

11 Drag and inertia coefficients (smooth, rough members)

12 Marine growth data as per BOD

13 Member and group overrides