9 replies to this topic

[Vignesh S]

One of my clients is asking for floating suction of HFO & LDO storage tank.
Type tank: Fixed roof
Tank Effective capacity: 1000KL for HFO /500 KL for LDO
Tank height: 10.8m for HFO/5.5m for LDO
No. of Tank: 2 Nos. for HFO/ 1 No for LDO

1. What is necessary of floating suction for storage tanks?
2. HFO tank is providing with steam outflow heater. Is it any problem if we are using steam outflow heater with floating suction?
3. What is the type of floating suction that we can use for this storage tank?

Thanks in advance.

Regards,
VignesH.

Edited by Vignesh S, 11 July 2012 - 06:32 AM.

[jrtailor09]

Dear Vignesh,

I don't have much idea about the floating suction but you can refer following link for your understanding & requirement.

http://www.landandma...Unit_copy1.aspx

Regards,

Jatin

Attached Files

•  floating suction.pdf   497.26KB   57 downloads

[Vignesh S]

Thank you Jatin. I have Google some information about this. I would like to share it.

http://www.hmttank.c...ing Suction.htm
http://www.opwftg.nl...764-765-766.jsp
http://www.gammontec...me/pdf/b059.pdf

Please note that we are going to proceed with double arm type floating suction.

Regards,
VignesH

Edited by Vignesh S, 19 June 2012 - 04:56 AM.

[Art Montemayor]

<sup>Vignesh:
This topic has been discussed in the past.
Perhaps you might be interested in what was mentioned then.

http://www.cheresour...ater#entry25317</sup>

[Vignesh S]

Thank you Mr.Art. I had gone through that link already. And I understood the type and need of floating suction. Now my main doubt is my 2nd question. (HFO tank is providing with steam outflow heater. Is it any problem, if we are using steam outflow heater with floating suction?)

Regards,
VignesH

[kkala]

A heavy slop floating roof tank (20000 m3) for local refinery (*) was designed with internal heating coils and floating suction, in addition to the normal suction (2008). Even though the tank was not constructed due to cancellation of the relevant project, no problem was anticipated from mechanical Department. I thought there could have been a construction problem, since heating coils (operating and standby) are extended quite close to tank bottom, thus making movement of floating suction difficult at low heights; but apparently it is not so.

(*) Max sg of slop products was ~1.05. Heating is not recommended for "fuels" of varying composition, and stored slops can be so; see http://www.cheresour...ng-and-handling '> http://www.cheresour...ng-and-handling .

[Art Montemayor]

VignesH:

I haven't used heaters in conjunction with a floating suction. However, I personally don't see how that could be a problem -- as long as you inform and specify it clearly to the floating suction supplier that you select. I strongly recommend that you not only inform the supplier of your specific plans to heat the contents - but also exactly how you plan to do it, complete with detailed drawings. Additionally, you should follow up and work together with both suppliers (floating suction and heating coils) in finalizing the issue for construction drawings, insisting on a written warranty from the floating suction supplier that there is no problem with the proposal and that the operation is safe and warranted.

[kkala]

For the slop tank of post no 6, one request for quotation comprised supply and erection of tank, heating coils, floating suction, as well as foundations / civil works. This was sent to several bidders (*), clarifications were exchanged, no problem was understood concerning floating suction and heating coils configuration.
(*) Project was cancelled about a year after receiving quotations.

[Vignesh S]

Mr.Art & Mr.Kkala:

Thanks for your post. This is project is in proposal stage only. I have taken a deviation ("Floating suction is not required as heating coil is at tank bottom, hence movement of floating suction is difficult at low heights") against client's enquiry.

Awaiting for my customer's response.

Thanks,
Vignesh.

[kkala]

No, floating suction "difficulty" has not been proved at low heights, at any case it is not a problem that cannot be settled. This is the meaning of previous posts.