Announcements
Welcome to the Revit Ideas Board! Before posting, please read the helpful tips here. Thank you for your Ideas!
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Pressure Loss through Tap always zero

Pressure Loss through Tap always zero

This issue has been outstanding for some years as described here;

https://forums.autodesk.com/t5/revit-mep-forum/pressure-loss-through-tap-always-zero/td-p/4952246

 

It is fundamental to our ability to use Revit as a design tool to be able to do a basic pressure loss calculation.
Please devote some resources to fixing this.

 

Thanks.

8 Comments
Kevin.Thickett
Enthusiast

We have global teams of users wanting to us this feature. I hope 6 years is long enough to wait to have this solved.

Martin__Schmid
Autodesk

Hi @Kevin.Thickett 

 

Thanks for participating in our Ideas site.

 

This issue was resolved in Revit 2017.

 

Note that while there is no pressure drop value listed in the properties palette for a tap, the value is computed and accounted for... you can see this in the Pressure Loss Report.  See image attached below.  The reason the value isn't in the properties palette is because there are two separate losses associated w/ the tap, and the properties palette doesn't permit showing the details of two separate values associated with the tap in a way that would make it clear which value is for which path (same is true for Tee fittings).

 

The image below shows that the tap (ID 1340996) is on section 4, 5, and 7.

The branch, section 5, has a loss as shown based on the flow rate through that branch.

The main section 7 shows the loss along the main based on the flow rate downstream of the tap.

The main section 4 shows 0 loss (you can intuit this because a loss through section 4 would imply that value applying to both downstream sections.. which would not be expected).

This method is consistent with how Tees report.

 

The focus of the improvement in 2017 was to overcome barriers due to 'correctness'... there still is room for improvement related to usability.. there are other ideas on here related to making it easier to interpret/navigate the pressure loss data.

2019-07-09_13-45-48.png

Martin__Schmid
Autodesk
Status changed to: Implemented
 
Kevin.Thickett
Enthusiast

Hi Martin,

Thanks for your reply that was very helpful.
I did believe this had been fixed & was somewhat surprised to get the query from our team.
Basically you're saying that straight through flow reports as zero, and branch flow reports a loss. Which is perfectly reasonable when you understand it.

Cheers,

Kevin.

Martin__Schmid
Autodesk

Hi @Kevin.Thickett - to clarify, in concept, there are three connectors on a tap just like there are on a tee.. .this is why on the pressure loss report you see three references to the same tap element ID (refer to my prior post).  Referring to the image below, with the arrows below representing the flow direction, and 0 indicating no loss for that connection, there is a loss along the main as well as the branch for a tap, just as there would be for a tee.

1.png

Tarek_K
Autodesk
Status changed to: Gathering Support
 
Tarek_K
Autodesk
Status changed to: Implemented
 
Anton_Welgemoed
Contributor

100% Agree

 

Can't find what you're looking for? Ask the community or share your knowledge.

Submit Idea  

Autodesk Design & Make Report


Autodesk Design & Make Report