Hi ALl,
We recently installed internal floating roofs (IFR) of the full-contact type in two new 150,000 bbl. regular gasoline tanks (145' diam. by 56'high). The IFRs were hydro tested per the request of the client. They were floated to the tanks critical height with successful results...
We are rehabilitating a tank as per API 653 and when the door sheet (cut by others) was re-installed, the welding produced a localized deformation (banding) on the top horizontal seam of the door sheet of 3/4". The project inspector claims that the banding should be not more than 1/2" as per API...
I have come across this situation many times lately and I would like to hear your opinion. Most of the designers, when writing specs for steel tanks, use "generic" specs just becasue they are not familar with API 650 or AWWA D100-05 Standards. When specifying the seimic design requirements...
I'm currently designing an API 650 tank to Appendix E. This tank will be set on top of and existing conrete base. The client is proposing the use of HAS rods with an epoxy adhesive (no welded nut nor hooked). However, section E.7.1.2 states that anchorage systems based solely on bond fricton...
When designing the anchor chairs in the API 650 tank that I'm currently designing, the stress in the shell (around the anchor chair location) exceeds the allowable stress (25,000 psi, per Table 3-21b). Options to decrease the stress are to increase the shell thickness, add more bolts or...
Hi,
I'm currently designing an API 650 tank that has been assigned to SUG I. Per Table E-7, the minimum required freeboard is 0.7d if SDS < 0.5g. What happens if SDS >= 0.5g? The table does not specify what to use if SDS >= 0.5g. Should the freeboard be equal to the wave height should this...
