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NDT or Total Cost Difference Between VIII-1 & VIII-2

NDT or Total Cost Difference Between VIII-1 & VIII-2

(OP)
Assume the design data (oil separator) given:
- Design pressure, P= 6 Mpa
- No cyclic load.
- Design temperature= 60 deg. C
- Weld joint eff. = 1.0 (RT-1, client requirement
- Design MDMT = -29°C
- Material: A-516 Gr 70 (normalized)
- Inside diameter, D = 3200 mm, TL/TL=5000 mm
- Corrosion allowance, CA = 3 mm
Thickness required of cylinder= 84 mm (by using VIII-1)
Thickness required of cylinder= 70 mm (by using VIII-2)
Question:
1. Except MT additional requirement, what is the differences in NDT requirement between VIII-1 & VIII-2 when RT-1 required?
2. Whether VIII-1 or VIII-2 which is cheaper in total cost for this case?
Wecome experienced estimation engineers give an instrustion/guidence - how to make decison whether using VIII-1 or VIII-2 for design pressure <=20 MPa of pressure vessels.

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