Use case

For lead engineers and quality managers.

Compliance and auditable reports: a design you can check line by line, and hand on to the Authorized Inspector with confidence.

Line drawing of the reference exchanger cut open from the rear end, showing the shell cover, the floating head, the tubes, and the baffles inside the shell.

What you review

Every result with its working.

The 2:1 ellipsoidal head of the teaching example, as a reviewer sees it in the package.

Shell cover head, 2:1 ellipsoidalASME Section VIII, Division 1, UG-32

Formula

t = P D / (2 S E - 0.2 P)

Inputs

P	300 psi	design pressure
D	40.25 in	inside diameter, corroded
S	20,000 psi	SA-516 Grade 70, ASME Section II, Part D
E	0.85	joint efficiency, spot radiography (UW-12)
c	0.125 in	corrosion allowance (UG-25)

Working

t = 300 × 40.25 / (2 × 20,000 × 0.85 - 0.2 × 300)
t = 12,075 / 33,940 = 0.356 in
t + c = 0.481 in

Result

After formingat least 1/2 in

Meets the requirement

The plate is ordered a little thicker, to allow for thinning in forming.

Reviewing a design

From the result back to the rule.

In the calculation package, each result stands with its formula, its inputs, and its code reference. A reviewer can follow any number back to where it came from, which makes the internal review, and the Authorized Inspector’s check after it, easier to follow.

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