IFR and all, happy new year !
Do the 4"apply on the radius or on the diameter ; shall we consider 8" on the total diameter, corresponding to 4" on each side when the EFR is centred ?
Thank you very much for your help
Refer to the answer posted on API Forum on 20-Dec-09
Geotech report highlights a predictible settlement of 8.4" (21 cm) at the edge and 15" (38 cm) at the centre of the tank ;
Do never consider a geotech report as conservative or not, as it is a factual report which results must be respected...
Concrete pouring for water tank wall height 5,5 m :
- No horizontal joints (not allowed by several codes)
- No problem to pour in one time ; depending on the method statement for concrete production + delivery + bucket lifting + pouring + vibrating, you have to plan vertical joints with...
If your new tank is to API 650 11th, foundation settlement mesured at full hydrotest shall comply with API 650 11th Art 7.3.6.6.
If your new tank is to API 650 10th, there is no foundation settlement criteria for a new tank at full hydrotest ; in that case, it is usual to consider Pr De Beer...
Attached are the anti-rotation device dwgs (2)
http://files.engineering.com/getfile.aspx?folder=1b590e6b-f9ca-4754-9eda-a94688afffab&file=21576-C09-1-F-GUIDAGE_VERTICAL_21576-C09-1_(1).pdf
Attached are the anti-rotation device dwgs
http://files.engineering.com/getfile.aspx?folder=768ec943-1e06-4c4f-950c-72e8348dc558&file=21576-C09-2-C-GUIDAGE_VERTICAL_DETAILS_21576-C09-2-C_(1.pdf
Thank you for your answer.
Attached are the anti-rotation device dwgs
I guess that with this device it will act as you describe
The PU foam seal will act as centring device on 125 mm gap on each side , but it is not designed for that and so it will be quickly damaged.
Thank you for your answer.
Some additional infos :
- The tank is 83 m diam, 20 m height, 18 m operating height
- The tank is 1 year new, with 6 months operations only, when at 11 m high the floating roof has sunken during loading
- Shell plumbness checking shows about - 78 mm inside horizontal...
I am looking for information related to design and new built or repaired API 650 tanks floating roof annular space tolerance criteria.
The point is :
- We have a new built deformed tank shell with identified out-of-roundness local areas,
- We have to design and built a new floating roof with an...
Geotech report highlights a predictible settlement of 8.4” (21 cm) at the edge and 15” (38 cm) at the centre of the tank ;
Do never consider a geotech report as conservative or not, as it is a factual report which results must be respected by each party involved ( civil contractor, customer...
Thanks a lot for your help.
In the mean time I have found an answer for the protection in API 650 11th Ed Art 5.4.5 and Fig 5.5 and for the sealing in Appendix B Fig B.1;
Regarding the protection system, I am more looking for an aluminium drip ring protection fitted outside on the shell about...
I am looking for API Std or RP requirements regarding tank bottom / foundation interface water ingress protection in order to specify criteria for a durable protection.
Could somebody help me ?
We are talking about API 653 - Appendix B - § B22 Shell settlement evaluation . The max allowable S defined at § B32 is related to the shell out-of-plane deflection, calculated from levelling measurement, then from the uniform settlement, then from the planar tilt settlement, then from the...
It depends on tank location and related temperature profile during the considered season
The CTR should explain and justify his query based on applicable codes & stds or professional practise
For the Client, tank verticality should be measured when the tank will present the maximum deformation...
Jacking is long and expensive, only for important foundation repair or replacement
When replacing the plate in the bulged area, you must repair the backfill underneath the plate, for instance by removing the existing up to 0,20 m deep and replacing by sand + 4 % cement compacted backfill prio...
Thank you. In reality, we have to make a temporary opening in the tank shell to enter with equipment for EFR removal, which seems to be considered as a major repair according to API § 3.20, so I guess we have to perform the hydrotest ; what do you think about ?
This is a 83 m diam x 20 m ht API 650 tank the external floating roof is to be dismantled and rebuilt with taking care about the bottom plate and no works within the critical zone; the rest of the tank is recent and was started up in May 2008 ; additionnaly a 2nd intermediate shell girder will...
Keeping the scaffolding inside and outside should not be allowed because during hydrotest, not only settlement but also verticality and ovalization should be checked for both new (API 650) and in service repaired (API 653) tanks
