We have an example where PVElite 2009 (Jun Built) applied different UG-16 min. thickness on report of :
1] Internal pressure (Shell)
2] Nozzle

On case [1], PVElite report stated 1.5 mm as minimum shell thickness (UG-16 case) since calculated thickness using UG-27 is lower.

On case [2], PVElite report applied 1.5875 mm (UG-16 b) at UG45 area.

Refer to ASME VIII-1 2007 Editin Add 08, UG-16 b stated 1/16 Inch [1.5] excluding any corrosion allowance is minimum for shell and head after forming.

1/16" = 1.5875 mm by normal conversion practice. (25.4 / 16)
But ASME code's rule is only 1.5 mm if use S.I. unit, and shall be applied consistently.

We are wondering why PVElite applied 1.5 mm and 1.5875 mm in-consistently on same model.

Our case is right at border case now. Result of analysis is clean if PVElite applied 1.5 mm consistently on shell and nozzle calculation.

Wish Coade can advise something about this.

Thank you!

Hi SK Tan,

You are correct that there is a problem in application of UG-16 min. thickness in shell and nozzle design as it using different values.

To the best of my knowledge, The problem is already brought to their notice earlier and also corrected by COADE and is going to come in next version of PV ELITE i.e. PV Elite 2010.

Hope this will help you soon. Meanwhile you can have manual calculations of nozzles for the same or you can explain to your client during discussions.

Thanks.

Mukesh

To Coade,

Coade just launched PVElite 2010. We are waiting for the installation disc.

Meanwhile, check with Coade, has the above UG16 error be fixed on PVElite 2010 as informed by Mukesh?

We could not see this on the PVElite 2010 changes list.

Thank you!

S K Tan

Hello Folks

In the 2010 version of PV Elite this issue has been fixed. If the thickness of a component is less that 1.5 mm, and you have chosen metric units, and set the configuration dialogue screen to consistent metric units, you will get this note:

Note: The thickness required was less than the Code Minimum, therefore
the Code Minimum value of 1.5000 mm per UG-16 will be used.

One of the problems we have is that people do not use SI Metric units, and PV Elite can get confused. For example, in many countries, such as India, stresses are designated in kgf/cm^2. This is not a metric unit. Other counties may state pressure in psi, and stresses in N/mm^2. PV Elite has no problem with proper SI Metric units, but may not be able to handle other units. Make sure you set the configuration dialogue screen to consistent metric units.

This link provides the details about the new enhancements in PV Elite 2010,

http://info.coade.com/content/PVEliteRelease