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Dear all, we had a requirement from customer to design the pressure vessels for 200000 hrs of operating life. we have the materials using in the creep range, so how to calculate the allowable stress for ASME materials at 200000 hrs operation. ASME Sec II D has 100 Favg% rupture stress at...

hi, we are analyzing a vertical vessel of diameter 8400mm with height 26000mm, supported by skirt and cone section at bottom, while checking the junction of cone to cylinder at skirt location, we are doing reinforcement calculation as per ASME Sec VIII div 1 appendix 1-8 for external pressure...

we are designing closely spaced process columns for wind loading - size of columns are Dia 3000mm x 30m height, spaced at a distance of 5m between two cylindrical columns. Is there any special consideration needs to be done for the close spacing under wind loading conditions? Regards...

As per API 650 clause 5.12 tank anchorage, table 5-21a shows uplift load calculation formula including seismic case as (4xMrw/D)-W2(1-0.4Av). In this W2 is given as dead weight of the shell and roof. since for seismic moment (Mrw) calculation we are including the content weight(liquid weight)...

thanks for the reply

i am working on a project where i am using braced frames on x- direction and ordinary moment frame on y-direction. whether this structure needs to be designed as dual system or analysis with seismic + x with R value of braced frame and seismic +Y with R-value of OMF is enough for the seismic...

dear all, i am using colombian seismic code nsr-10 for one of my project. i have doubt, as per code i have calculated seismic base shear as Vs = Sa g M How to use the R-value in the seismic calculation. there is no formula given in code on using it in seismic base shear calculation. please...

thank you ron

we are using anchors bolts with bottom nut and washer. refer attachment. in order reduce the anchor rod bottom side threading and nut. we propose to use only bottom plate washer welded to anchor rod without nut. IS it OK in terms of pullout strength requirement? regards...

what will be the edge distance from the shear key pocket size to anchor bolts center.

i have been working on a pile foundations, I need to know what will be minimum time required for curing of concrete before commencement of following works after piling, 1.pile breaking to cut off level. 2. pile intergrity test 3. pile cap & pedastal concreting. 4. form work removal. 5. pile...

dears, we are designing the pile foundation, where there are requirement for pile testing for routine pile test and initial test pile. initial test pile to be done for 2.5 times the safe load and routine pile test to be done for 1.5 times the safe load i have a doubt whether the reinforcement...

i am designing a column base plate with large moment as per aisc design guide -1, P = 2000 kn Mu = 5000 kn-m due to higher moment, i am getting very large base plate dimension to satisfy inequality eqn. how to reduce it? regards,

thanks for your replies, this x-bracing is already in site, we want use with minimum repair, what would be the good solution? introducing the gusset at center, but the there is no enough length

hi we have been using x bracing in our support structure, refer the attached sketch where the support structure was designed as SCBF(special concentric braced frames) since there is no length at x-bracing intersection for making gusset conn, we have made direct pipe to pipe welding at...

dears, what is the American standard used for the SOx and Nox Emission performance test. thanks senthil

dears, we are designing a condensate storage tank with following properties, is this tank has to be code stamped as per asme sec viii div-1 Operating pressure - 2 bar temperature - 200 deg.c Capacity - 10 m3 thanks

hi we are using the star type columns, refer attached sketch for calculating the h/tw limit for section classification as per aisc, can we take half of column depth as h (H/2) for the calculation. Since this is symmetric t-sections about center. regards, senthil...

Dears, what is the equivalent American code for en14015 - Specification for the design and manufacture of site built, vertical, cylindrical, flat-bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperature and above?// thanks senthil

yes thats correct, thanks