40

Notes:

1. The governing thickness (or heads is based on that portion of the head which is in tension. For a 2:1 S.E. head this is the crown position where R = 0.90.

2. Includes pipe 12%% under tolerance.

3. Thickness exclusive of C.a.

4. Thickness at the hub (weld attachment) governs.

5. The governing thickness of flat heads and blind flanges is 1/4 of actual thickness.

6. Since the tension stress in the wear plate is less than the tension stress in the shell, the MDMT for the shell will govern.

Notes:

1. The governing thickness (or heads is based on that portion of the head which is in tension. For a 2:1 S.E. head this is the crown position where R = 0.90.

2. Includes pipe 12%% under tolerance.

3. Thickness exclusive of C.a.

4. Thickness at the hub (weld attachment) governs.

5. The governing thickness of flat heads and blind flanges is 1/4 of actual thickness.

6. Since the tension stress in the wear plate is less than the tension stress in the shell, the MDMT for the shell will govern.

Design Conditions (for example)

P =400 PSIG C.a. =0.125 Fti = 30" E (Shell) =0.85 E (Head) = 1.00 MDMT for vessel = + 11°

NPS 10 SCH 80 PIPE (I O.S84c) (SA-53, OR-a, WELDED)

NPS 10 SCH 80 PIPE (I O.S84c) (SA-53, OR-a, WELDED)

Figure 2-53. Dimensions of vessel used for MDMT example.

SEAMLESS 2:1 ELLIPSOIDAL HEAD , . ix« (0 657'MIN THK

Figure 2-53. Dimensions of vessel used for MDMT example.

1. SELECT UCS 66 MATERIAL

2. UG-20 DESIGN TEMPERATURE

3. UG-22 LOADINGS

4. DESIGN FOR INTERNAL AND/ OR EXTERNAL PRESSURE

1. SELECT UCS 66 MATERIAL

2. UG-20 DESIGN TEMPERATURE

3. UG-22 LOADINGS

4. DESIGN FOR INTERNAL AND/ OR EXTERNAL PRESSURE

Figure 2-56. Flow chart showing decision-making process to determine MDMT and impact-testing requirements.
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