Emergency overfill nozzle in external floating roof possible/advisable
Emergency overfill nozzle in external floating roof possible/advisable
(OP)
Hello,
I have a 44 m dia water buffer tank. Client is asking for a external floating roof and also an overflow nozzle. Considering seal system, is overflow nozzle advisable.
As per C.3.1.1 of API 650 overflow opening can be provided, SO what need to be considered when locating overflow nozzle, I mean it should be above HHLL, and any special consideration when selecting seal system, so that it doesn't interfere in operation of overflow nozzle
Regards,
Inam
I have a 44 m dia water buffer tank. Client is asking for a external floating roof and also an overflow nozzle. Considering seal system, is overflow nozzle advisable.
As per C.3.1.1 of API 650 overflow opening can be provided, SO what need to be considered when locating overflow nozzle, I mean it should be above HHLL, and any special consideration when selecting seal system, so that it doesn't interfere in operation of overflow nozzle
Regards,
Inam
RE: Emergency overfill nozzle in external floating roof possible/advisable
Apart from wondering why you have an EFR for a water tank, there are many types of overflow. - what's wrong with a dome roof or does the client like spending money he doesn't have to?
You could have holes simply cut into the tank shell will little spouts or you could have pipe(s) which extend through the roof with holes cut into the pipe at the required height if you're worried about roof seals which go down into the tank and out at the bottom through a nozzle. Less splashing that way.
All depends on your max inlet flowrate.
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RE: Emergency overfill nozzle in external floating roof possible/advisable
Mr. inammanj123,
Pls ask to the client to show a water tank constructed with floating roof.. Ask also the EFR seal manufacturers what type of seal is appropriate for water storage tank..
RE: Emergency overfill nozzle in external floating roof possible/advisable
Secondly the exact service is waster water, so maybe due oil in water they are asking for floating roof. what do you guys think.
Regards,
Inam
RE: Emergency overfill nozzle in external floating roof possible/advisable
As mentioned above tank is for waste water service. Additionally The tanks shall be also provided with an adequate overflow line to route any excess flow to the existing Firewater/Storm Water Basins. Overflow shall be constructed with an internal dip pipe so that the oil layer on the top of the tank is retained within the tanks. In case of floating roof tank, kindly suggest possible arrangement of overflow dip pipe with floating roof present.
RE: Emergency overfill nozzle in external floating roof possible/advisable
You might be able to come up with some sort of sliding collar, but it's quite odd. I'll sketch something up later.
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Also: If you get a response it's polite to respond to it.
RE: Emergency overfill nozzle in external floating roof possible/advisable
Thankyou for your feedback. If possible kindly send some data on the actuated valve or pump and how it can allow an overflow nozzle in a floating roof tank.
When you have time , kindly do send some sketch for sliding collar system.
Regards,
Inam
RE: Emergency overfill nozzle in external floating roof possible/advisable
However what this is a top hat sliding sleeve intended to be pulled up by the roof structure.
If you locate the holes in the right location and the sleeve the right length then it should allow a certain amount of liquid above the holes in the overflow.
Just an idea....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.