Dear Colleagues,

We have recently added a short ASME Code quiz to our website in connection with this autumn's seminar programme.

Although I am sure it will not be a real challenge to you experts feel free to have a look at the quiz and maybe forward the link to whoever might be interested in it.

http://www.onetb.com/quiz

As always any comment will be highly appreciated here.

Enjoy

Piotr

Dear Paluszkiewicz,

Answer to question no 5:

"What is the minimum thickness for a carbon steel pressure vessel shell for compressed air service, when there is no corrosion allowance specified?"

is mentioned as 1.5 mm which appears to be an error.

As per UG 16 (b) 4:

"The minimum thickness of shell & head used in compressed air service, steam service and water service made from material listed in table UCS 23 shall be 3/32 in (2.5 mm) exclusive of any corrosion allowance.

Regards

Sanjeev

Thank you for your advice, you are absolutely right. Now it shows the correct answer.

Best Regards
Piotr

Dear Sir,

Reply of Question no. 5 should be "1.3 x MAWP * (Stest/Sdesign) + value to cover the static head" due to below reason:

"In case the hydrotes performed in horizontal condition, the test pressure value shall be increased by the hydrostatic head with the eqipment in Vertical position, so that the bottom equipment section is stressed by the same pressure from which it should be stressed in case of test performed in vertical position (for future site test)".

Above is normal practice. Kindly reveiw the reply.

Regards,
Sunil Agrawal

Hi,
I suppose you are talking on question 9 regarding the test pressure. I´m afraid, although it´s normal practice, it´s no Code requirement. If your test procedure tells you to add the static head and you perform an additional calculation which covers this, you are on the safe side for future field site test. However, the Code requires that all parts have to be tested at...
... and this is answer B, isn´t it?

Michael

For question 9, the static head is included in the determination of MAWP and therefore included in the equation.

There is no need to add it a second time as a separate value. Ref UG-98(b)

UG-98(b) The maximum allowable working pressure
for a vessel part is the maximum internal or external pressure,
including the static head thereon, as determined by
the rules and formulas in this Division, together with the
effect of any combination of loadings listed in UG-22
which are likely to occur, for the designated coincident
temperature, excluding any metal thickness specified as
corrosion allowance

Question 6 is an excellent question that helped me remember the Code requirement... Thanks!

_________________
A question properly stated is a question half solved.

I agree with Fronhert and Jackal, there is a code interpretation VIII-1-95-27, which clarifies the same:

Interpretation: Vlll-1-95-27
Subject: Section VIII, Division 1 (1992 Edition, 1993 Addenda); UG-99(b)
Date Issued: January 12, 1995
File: Question (1): Does the last sentence of UG-99(b) of Section VIII, Division 1, “All loadings that
may exist during this test shall be given consideration,” require that the static head that exists in a
tower in the vertical position must be considered when determining the test pressure in the horizontal
position?
Reply (1): No.
Question (2): Does UG-99 specify in which position a vertical tower must be hydrotested?
Reply (2): No.

Hope this answers the query.

M