2 replies to this topic

[Anup87]

Dear All,

This is regarding UL-58 coded tanks. I am currently doing revalidation of vent adequacy check for UL-58 coded tank. In UL-58 code, I was not able to locate anything about venting requirement calculations. However, they do have provided table for minimum vent size requirement in Table 10.2. However, I don't think this vent is capable of handling relief loads in the event of overfilling. Can anyone guide me, how to deal with overfilling and blocked outlet cases on this type of tanks.

In addition, code doesn't talk about an emergency venting requirements. This might be due to, since these tanks are underground, they will not need any emergency venting. Am I right?

Thanks in advance,
Anup.

Edited by Anup87, 16 October 2012 - 01:33 AM.

[proinwv]

Emergency venting is generally for fire exposure, so if the tank cannot experience that condition E.V. would not be needed.

I do not know this code you reference. For me to understand it you will need to offer more information.

[fallah]

Anup87,

Paul is completely right on below statement:

Emergency venting is generally for fire exposure, so if the tank cannot experience that condition E.V. would not be needed.

But there may be an exception; suppose there wouldn't be any fire exposure but full open PCV (N2 blanketing valve) scenario might cause producing a very high relief load will lead to high size of conservation vent. In such cases it might, keeping the conservation vent at normal size and adding an emerjency vent for full open valve scenario, be more logical in technical/economical point of views.

Fallah