Dear Rohr2 Support Team,
Is it possible to analyse preheating procedure for DH-pipe with single use compensator (SUC) in Rohr2 ?
(In situations where cold laying is not appropriate, preheating in open trench can be avoided by using single use compensators.)
Can you explain how?
I think the preheating procedure as a "line load" in Rohr2, uniform heating up (ADT) with load= +.....°C.
Best regards
Andras
EN 13941
-
rohr2admin
- Administrator
- Beiträge: 644
- Registriert: Di 13. Sep 2011, 14:03
Re: EN 13941
Hello,
in the soon-coming ROHR2 33.1 we implemented such component, here is the description from the changelog:
There is a new component "one-time compensator" for district heating systems. Disposable expansion joints are used in district heating pipelines to pre-stress the pipeline. After the initial heating of the pipeline to operating temperature, one-time compensators are welded and locked, this causes a pretension for the pipeline.
For one-time compensators, a calculation pre-stress is performed to determine the strains on the compensators. These strains are then taken into account as prestress loads for all operating load cases. The expansion joints themselves are then no longer considered in the calculation model.
Can you wait a bit longer before you need this function?
best regards
ROHR2support
in the soon-coming ROHR2 33.1 we implemented such component, here is the description from the changelog:
There is a new component "one-time compensator" for district heating systems. Disposable expansion joints are used in district heating pipelines to pre-stress the pipeline. After the initial heating of the pipeline to operating temperature, one-time compensators are welded and locked, this causes a pretension for the pipeline.
For one-time compensators, a calculation pre-stress is performed to determine the strains on the compensators. These strains are then taken into account as prestress loads for all operating load cases. The expansion joints themselves are then no longer considered in the calculation model.
Can you wait a bit longer before you need this function?
best regards
ROHR2support
-
Andras
- Beiträge: 2
- Registriert: Sa 20. Feb 2021, 12:13
Re: EN 13941
Dear Rohr2 Support Team,
Well, now I need this function.
I think, if I insert the point load ( eg. -60mm as a distance) it will be good, or am I mistaken?
And I have an other question.
When I use the stress reduction by prestressing in open trench the pipes are heated up to the preheating temperature. On the other hand Rohr2 is in reverse working. Necessary insert as a line load (ADT) as a negative temperature difference, or negative expansion load. This is a little bit troublesome. Why do not you inserted in the software a new function for DH-pipe eg. "prestressing by preheating"?
Best regards,
Andras
Well, now I need this function.
I think, if I insert the point load ( eg. -60mm as a distance) it will be good, or am I mistaken?
And I have an other question.
When I use the stress reduction by prestressing in open trench the pipes are heated up to the preheating temperature. On the other hand Rohr2 is in reverse working. Necessary insert as a line load (ADT) as a negative temperature difference, or negative expansion load. This is a little bit troublesome. Why do not you inserted in the software a new function for DH-pipe eg. "prestressing by preheating"?
Best regards,
Andras
-
rohr2admin
- Administrator
- Beiträge: 644
- Registriert: Di 13. Sep 2011, 14:03
Re: EN 13941
Hi,
you can also use the function under "edit|special assembly temperature" to model this. Like this the global assembly temperature will be overridden and the selected segments will get their own "origin" for the thermal expansion.
In case you need an urgent answer, just write to our support email adress, if you have an active maintanance contract, you will get your answers very quick.
Best regards
ROHR2support
you can also use the function under "edit|special assembly temperature" to model this. Like this the global assembly temperature will be overridden and the selected segments will get their own "origin" for the thermal expansion.
In case you need an urgent answer, just write to our support email adress, if you have an active maintanance contract, you will get your answers very quick.
Best regards
ROHR2support