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Half Pipe Coil Rupture


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#1 rikakose

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Posted 12 March 2019 - 05:06 AM

I have a reactor equipped with half pipe coil (DN 100)

 

Do I have to include the coil rupture case in to my reactor PSV calculation?

 



#2 latexman

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Posted 12 March 2019 - 06:05 AM

Do you have some sensible reasons not too?  You've given us nothing to go on.

 

What are the services/fluids?  Is any corrosion going on on either side?  What's the operating and design pressures?  What's the consequences?  What is the risk?  Is that risk acceptable?  



#3 Chemitofreak

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Posted 12 March 2019 - 06:06 AM

Hi,

 

Yes, if the coil ruptures and there is a possibility of over pressurization then you have to consider it.



#4 rikakose

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Posted 12 March 2019 - 06:54 AM

The comment is from our Engineering manager.  She said we need to include coil rupture case in the coil PSV calculation. I think her comment is non sense.

But the comment reminds me to think about the reactor PSV calculation since coil rupture was not included in the reactor PSV calc. Hazop study didn't indicate the rupture case.

 

Coil (design P 10 barg) will be used for both heating (steam 6barg) and cooling (water 12ยบC 6 barg)

Reactor side is atm for normal operating, design pressure 10 barg

Material is alloy, coil thickness 4 mm, ID 100mm

 

I was suggested that if the coil is bigger than 1"(DN25) it is considered as pipe, there is no rupture issue with a pipe. Only tube has the risk.

 

My question is actually: does half-pipe coil have the risk of breaking

 

 

 

 

Do you have some sensible reasons not too?  You've given us nothing to go on.

 

What are the services/fluids?  Is any corrosion going on on either side?  What's the operating and design pressures?  What's the consequences?  What is the risk?  Is that risk acceptable?  


Edited by rikakose, 12 March 2019 - 07:03 AM.


#5 rikakose

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Posted 12 March 2019 - 06:59 AM

There is no corrosion issue. This is special alloy. 

Consequence is steam or cooling water invades reactor and reaction would be quenched.  

Reactor is insulated with mineral wood.

Do you have some sensible reasons not too?  You've given us nothing to go on.

 

What are the services/fluids?  Is any corrosion going on on either side?  What's the operating and design pressures?  What's the consequences?  What is the risk?  Is that risk acceptable?  


Edited by rikakose, 12 March 2019 - 07:00 AM.


#6 latexman

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Posted 12 March 2019 - 09:16 AM

Is the half-pipe inside or outside the RX?  What schedule is the half-pipe?  How thick is the RX wall?

 

Both sides have 10 bar design pressure.  I'm beginning to think there is no credible rupture case.  More than likely a slow developing leak will occur well before any rupture.  For a slow developing leak we model that as a 1/8" diameter hole.  In our case, the leak is usually at the weld seams.






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