As some of you may be aware, a very destructive earthquake has hit near Christchurch in NZ. The epicentre was almost in the Port of Lyttelton.
We have recently built a 30m diameter tank, 16m high, which has been fitted with an Internal Floating Roof (IFR). At the time of the quake, the tank was...
We have taken a coupon out of a tank to determine the weld efficiency to use in the calculations and have the following test results:
508 MPa - UTS Parent metal (both Long and Trans)
410 MPa - UTS Weld 1
417 MPa - UTS Weld 2
375 MPa - UTS Weld 3
The cross sectional area of the test specimen are...
I am looking for people's opinions on the practice of painting a tank prior to the hydrotest. I remember seeing a thread on this before, but can't seem to locate it again.
Due to the onslaught of winter, we have a contractor who would like to internally line the floor and first strake of a new...
I have been inspecting a tank which used to have an external pressuriser roof, which has a water trough over the top strake. We have taken some thickness readings on the inside of the tank (the only way to get the actual tank shell thickness readings in this area) and found readings between 2.9...
We have a tank due to come out of service shortly for an internal inspection. During the external inspection (and NDT) we found that there was a lamination in the corner of one of the plates - ie above a horizintal weld, and to the right of a vertical.
Although it is up in the 2nd-to-top...
API653 Section 12.3 relates to the hydrotesting of a tank after major repiars and states "A full hydrostatic test, held for 24 hours, shall be performed...."
What is the definition of a "Full Hydrostatic test". I have a client who just wants to go for the minimum possible. The only references I...
My questions are in 2 parts...
We are constructing a 32m dia floating roof tank to API650, with fire protection to NFPA11.
Part 1
NFPA11 Table 5.3.5.3.1 indicates spacing between the foam discharge outlets depending on the 'foam dam'. It is not clear if the measurements for the foam dam are...
I have a tank which has a very low nozzle which I have been asked to inspect to API653. It has never been inspected before, and the drawings have some references to API650.
This is a 6" nozzle, which has been installed touching the floor to shell joint. The strake is 17mm thick, and the nozzle...
When installing a new nozzle in a tank to API653 (and hence API650) is it permissible (to API) to add strengthening gussets that run along the nozzle and span between the tank and the nozzle flange?
(ie if the nozzle and tank produce an H,
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then...
I have just placed an order for the new API653 - Feb 08 revision - Addendum 3.
The Draft version (Jan 08) obviously flew through to the publishers pretty quick....
Can anyone tell me why API650 asks for a minimum 50mm (2 inches) floor plate projection from the outside of the shell?
I have a contractor who has ended up with 45mm (just less than 1-13/16") and hence the tank does not strictly comply with API650.
For tanks already in service, API653 would...
I have a tank currently underconstruction, which has had about 35% of the Radiographed welds fail. These failures are only small in nature (but still large enough to be a failure obviously) so not huge gaping holes etc.
I have scoured API650 and some of ASME IX but can not find if there is...
I have been asked to look in to the assessment of BST nozzles to API653. The code basically says to evaluate the thickness with the 'as-built standard'. However, often these tanks were built to an unknown code.
I have therefore been evaluating to both API650 (essentially Sched 80 pipe) and...
