Re: [MW:29447] Heat Treatment : Dish End

According to UG-79 Heat Treatment is required for Cold Forming heads when:

A- Extreme Fiber Elongation is more than 40%

B- Fiber elongation is more than 5% and any of the following condition exist:

 - Impact Test is not exempted according to UCS-66

 - Heads for lethal service vessel as restricted in UW-2

 - Head plate thickness before forming is 16 mm

 - Thickness reduction at any location after forming is more than 10% of actual thickness where extreme fiber elongation is more than 5%

 - Forming Temperature between 120-480 deg. C

You may calculate fiber elongation from formula given in Table UG-79.1 or better to consult with pressure vessel designer for this calculation. 

(Heat Treatment when applicable will perform by following UCS-56 requirements)

Hot Formed heads in no case does not require heat treatment after forming.

Regards,

On Sun, Mar 31, 2019 at 7:26 PM George Dilintas <dilintas@gmail.com> wrote:

Wrong,

you should read UCS-79 carefully. The HT is a function of P-No and extreme fiber elongation, and service conditions.

UCS is applicable for carbon steel materials

For high alloy (example stainless steel) pls refer to UHA-44

For enhanced ferritic steels pls read UHT-79.

Friendly advise: read the Code carefully

Στις Κυρ, 31 Μαρ 2019 στις 5:34 π.μ., ο/η Brijesh Maurya <brijeshmaurya492@gmail.com> έγραψε:

thickness above 16 mm as per UCS-79 of ASME sev.VIII div.1

On Thu, Mar 28, 2019 at 4:53 PM vikram saipogu <saipoguvikram@gmail.com> wrote:

Dear All,

Under which Condition,

Heat Treatment is mandatory for dish end ?

Thanking you.

Best Regards,

Vikram Saipogu

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