Vent Duct Modify Box

[ersoyci]

Hi,

We can't modify a vent duct line's Leakage Porosity, Leakage Intervals etc. as shown in attached picture.

In underground operations, we sometimes need to change intervals of a branch of vent ducts or some portion of vent duct leakage porosity is better or worse than rest. We need to partially modify leakage porosity, intervals etc. (in short, grayed attributes) of vent ducts.

In addition to this, it would be useful to modify the offsets of a vent duct as a group. In order to change the offset, we have to remove the vent duct, re construct it.

Thanks a lot.

Regards,

C.

[Martin Griffith]

Hi, 

For ducts, the duct and leakage network structure is built and fixed at the moment of the duct creation. When you create a new duct, if you don't specify any leakage then the leakage connections are not needed, so they aren't built. They can't be added in later. Similarly, the offsets relate to the network structure and can not be modified through the Duct Builder. 

So you need to specify some leakage when the duct is built. If you do this, then the option to modify it later will be available. 

You can move the ducts using the Move Tool, but if you do so, you may change the lengths of the duct and interval distances, meaning that you could change the leakage porosity. You might also accidentally detach the leakage connections. 

But you shouldn't have to change the offsets very often; they are only for visual purposes and have no effect on the simulation. If you really need to change the offset of the ducts, then it's probably better to rebuild the duct. 

[ersoyci]

9 hours ago, Martin Griffith said:

Hi, 

For ducts, the duct and leakage network structure is built and fixed at the moment of the duct creation. When you create a new duct, if you don't specify any leakage then the leakage connections are not needed, so they aren't built. They can't be added in later. Similarly, the offsets relate to the network structure and can not be modified through the Duct Builder. 

So you need to specify some leakage when the duct is built. If you do this, then the option to modify it later will be available. 

You can move the ducts using the Move Tool, but if you do so, you may change the lengths of the duct and interval distances, meaning that you could change the leakage porosity. You might also accidentally detach the leakage connections. 

But you shouldn't have to change the offsets very often; they are only for visual purposes and have no effect on the simulation. If you really need to change the offset of the ducts, then it's probably better to rebuild the duct. 

Hi,

It does not allow you to change the leakage for a part of the duct eventhough you specify some leakage when the duct is built. Attached file "1" is the Duct Edit box when we select the entire duct. It allows you to modify the Leakage Porosity. Attached file "2" is the Duct Edit box when we select some parts of the duct. It doesn't allow you to change the porosity. The reason we ask this to be enabled is that as I said in my earlier post, a branch of a duct network sometimes needed to be modified hence its leakage porosity changes.

The suggestion for leakeage and offset is just to make the software more user friendly, in any case if it doesn't change, we always rebuild the duct to be certain that we don't accidentally detach something.

Thanks.

C.

[Martin Griffith]

The reason you can't modify the leakage is because if you don't select the whole duct together, then the leakage connections are not included in the selection, so therefore the leakage fields are disabled on the form. If you want to be able to modify the leakage you need to include the leakage connections in your selection.

To do this, what you need to do is switch to wireframe mode so that you can see the leakage connections. Then select the portion of the duct you are interested in, but also select the relevant leakage connections. Now if you open the duct form, the option should be there. 

[ersoyci]

That's good to learn. It seems to be the answer I've been looking for.

Thanks Martin.

C.