封头成型程序

1.0 SCOPE

The procedure defines the minimum requirements of material,manufacture and

inspection of heads forming for FPSO-BLOCK 12W DEVELOPMENT Project.

2.0 RESPONSIBILITY

The head forming subcontractor is responsible for head forming, final preparation fully in accordance with the ASME CODE SECTION Ⅷ and Jutal Process & Check List for Head.

3.0 HEAD DESCRIPTION

3.1Manufacture and Inspection Code

ASME SEC. VIII, V. 1 - ED200 DI7 & ASME Code Section VIII, Div.1, Para UCS-79

3.2Design Parameter

Material: SA-516 Gr.70N

Design pressure 16 Bar

Design temperature80ºC

Joint efficiency: 1.0

MDMT :0ºC

3.3 Head demission and quantity

Head type Semi-ellipsoidal head

Dimension (mm)I.D. 2000 X THK16.2

Quantity 6 pcs

Cutting dim.(mm)2540

Forming type Heat forming(Heat forming temperature: 900ºC~950ºC)

4.0 TECHNICAL REQUIREMENTS

4.1Head plates shall be inspected before forming, any defects is not permitted such as

laminations, shearing cracks, etc .

4.2The edge of plate should be radiused, without sharp and burr;

5.0 TOLERANCES AND SOLUTION TREATMENT

5.1Inner surfaces shape deviations “E”

The inner surfaces of ellipsoidal head shall not deviate outside of the specified shape by more than 1.25% of D nor inside the specified shape by more than 0.625% of D, where D is the nominal inside diameter of the vessel shell at point of attachment.

5.2Difference between the maximum and minimum diameters “e”

The skirt of heads shall be sufficiently true to round so that the difference between the maximum and minimum diameters shall be less than 0.5% of the nominal inside diameter ;

5.3Minimum thickness “T min”

The reduction of the plate thickness shall be less than 10% , minimum thickness after

forming shall not be less than 16.2(mm) ;

5.4Total height tolerance “△H”

It shall not exceed -0.2~0.6%(mm) of the nominal inside diameter;

5.5Skirt height tolerance “△h”

For all heads with skirt ,the upper value of tolerance is -5~10%(mm) of skirt height

5.6Gradient of the skirt “h og ,h ig”

The outward gradient value of the head skirts shall not exceed 6% of skirt height ,the inward shall not exceed 4% of skirt height ;

The manufacture tolerances of the heads is shown as follows:

6.0 CERTIFICATION

The head forming subcontractor shall provide quality certificate of the head forming, including the inspection reports of dimension and shape, and thickness examination.

7.0 ATTACHMENT

Head drawing for Fine Filter VESSEL(S-38-02A/B/C)

8.0 PROCESS CONTROL

1.How is the head pre-formed?

2.How many times pressing operation? All done consecutively?

3.What method to detect temperature drop?

4.How is heating / cooling carried out?

5.How is normalizing temperature maintained?

6.Show sketch of forming sequence (or flow chart).