Pressure Vessel Internals, Attachments, Clips and LugsPaul Daniel2019-03-14T14:01:40-04:00
Pressure Vessel Internals and Attachments
The COMPRESS Attach Menu allows designers to quickly include the mechanical effects of pressure vessel internals and attachments in their designs. It is also used to analyze common pressure vessel details such as clips and lugs. How COMPRESS deals with individual attachments varies depending on its type and location as described below.
Platforms, Ladders, Insulation and Piping
Adding attachments directly to a pressure vessel, including platforms, ladders, piping and insulation, adds weight and increases the vessel’s projected area and wind loads. In these cases, COMPRESS takes the attachment’s details and calculates its contribution to the vessel’s mass distribution, horizontal shears and overturning moments. The attachment loads are then combined with all other specified loads due to pressure, weight, wind and seismic in the final COMPRESS design report.
Trays, Packed Beds and Linings
Adding pressure vessel internals such as trays, beds and linings adds weight but does not increase the vessel’s projected exterior cross sectional area. COMPRESS uses the specified internals to calculate their contribution to the vessel’s mass distribution and period of vibration. This in turns flows through the combined weight, wind and seismic horizontal shears and overturning moment calculations as required.
Clips and Lugs
A very handy option on the COMPRESS Attach Menu is the ability to perform a local stress analysis on small attachments such as clips and lugs. The local loads and geometries specified are analyzed using WRC 107 / WRC 537.
The COMPRESS Attach Menu feature:
Lets you add as many attachments and internals as you want
Allows you to specify if attachments and internals are present in the empty, test, lift and shipping cases
Calculates the effects of the load combinations on pressure components such as cylinders and transitions
Determines the attachment’s and internal’s effects on pressure vessel supports including skirts, legs and lugs
Calculates the attachment’s and internal’s effects on skirt base rings, leg base plates, anchor bolts and foundations
Performs WRC 107 / WRC 537 local stress analysis on clips and lugs