API 650
API 650
(OP)
I am working on requesting quotes for shop fabricated steel tanks that will be used to hold various petrolium products. The tanks are 20000gal and smaller, and are LEG supported. I sent the request out and got responses, but while in the bid process I had conversations with some vendors (not all) that lead me to undersatnd API 650 is not applicable to leg supported tanks. Yet those vendors still gave me a cost to do the work ...?
I read the API code (I just ordered them) and I agree it does not seem to accomodate leg supported tanks.
Does anyone no what code covers leg supported petrolium holding steel tanks?
What is standard for my request? I know for a fact we have requested API certification for leg supported tanks and got it from vendors. How are they doing that? I think I am missing a very important part of the puzzel and am not able to find a reasonable and consitent answer from anyone I talk to.
Thanks in advance.
I read the API code (I just ordered them) and I agree it does not seem to accomodate leg supported tanks.
Does anyone no what code covers leg supported petrolium holding steel tanks?
What is standard for my request? I know for a fact we have requested API certification for leg supported tanks and got it from vendors. How are they doing that? I think I am missing a very important part of the puzzel and am not able to find a reasonable and consitent answer from anyone I talk to.
Thanks in advance.






RE: API 650
RE: API 650
RE: API 650
Sorry for the asking the same question 10 different ways.
THANKS
RE: API 650
RE: API 650
1.) By the original poster
2.) By the mfgr for not taking what I would consider clear and appropriate exceptions. Or, rereading, maybe faint whisperings of exceptions has something to do with the asking of the original question.
Plz see follwoing,
ht
Q: Does API certify tank manufacturers?
A: Yes, to Specifications 12B, 12D, and 12F. API does not certify manufacturers to Std. 650 at this time.
ht
Q: Does API issue a certificate to verify that a tank has been built to API 620 or 650?
A: No. The manufacturer is responsible for certifying that the tank has been constructed in accordance with API 650 (see API 650, Section 8.3)
Q: How do I get my tank certified by API to Standard 620 or 650?
A: API no longer certifies tanks built to API 620 or 650. The API Monogram Program does include tanks built to Specifications 12B, 12D, and 12F.
So, what is current practice then?
RE: API 650
There are a lot of tanks built that do not fully fall under the various tank standards. For example, API-650 is titled "Welded Steel Tanks for Oil Storage", but you'll find it used for water, wastewater, ethanol, molten sulfur, acids, food products, agricultural products, all manner of chemicals, etc.
In the case of leg tanks, AWWA D100 does include that configuration for municipal water towers. However, it really isn't any assistance in the design of the tanks, and there isn't any great advantage in specifying it for oil tanks (it's intended for water storage, of course). Similarly, API-620 could perhaps be applied to these tanks, but doesn't really include useful design information pertinent to the tanks, and is intended primarily for a different application (ie, pressurized tanks).
Unlike pressure vessels, there is not a requirement that all tanks be built to this or that code. Different industries have developed standards for the more common applications. Those standards are routinely applied to less common applications simply for lack of anything better. It may seem odd to apply API-650 to these tanks, but if the alternative is no standard at all, it makes more sense.
If you'll refer to Fig. 8-2 in the current API-650, the certification states that the tank "meets all applicable requirements of API Standard 650", and that statement could be made about tanks that deviated considerably from the type of tank API-650 is intended for.
RE: API 650
1) You're dealing with a salesman who doesn't know API 650 from his . . . well, you know. He's just noddin' his head to make the sale.
2) The vendor perfectly knows API 650 is not really applicable but he'll comply with the parts that are relevant and exercise good engineering judgement otherwise. He doesn't want to embarass you (or trouble himself maybe) by explaining that you've spec'd the wrong code.
3) The vendor is a complete moron and he doesn't realize the cook book formalus in API-650 won't apply to leg supported tanks and he's gonna apply them anyway. Buyer beware!
The bottom line is you really need to feel comfortable that the vendor knows what he is doing. You can help by not specifying codes that, IMHO, really aren't applicable.