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Heater Material Specification


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#1 ABCDER

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Posted 10 April 2019 - 11:17 PM

Hi All,

 

As a part of my project, I came across a situation to calculate the heater duty of a electrical heater which is mounted on a tank ( To maintain temperature). I have done the same and obtained a value of 14.56kW (The steps which I followed are those in the attached file). Now, I have to specify the material. Could anyone in the forum provide me with necessary guidelines for the same. I tried the same with Predict software. But what prevented me in obtaining the result was, I have a Oxygen content of 4000ppb whereas we can only input a maximum of 1000 ppb in predict. Am I following a wrong way? Hope someone could help me .

 

 

Thanks in advance.

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#2 thorium90

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Posted 11 April 2019 - 04:40 AM

I thought the material of the heater would largely depend on the medium being heated.

Since this is an electric heater, i pretty much think the material would be a steel, possibly SS316 would be my first thought.. 

Is there something you are aware of in the medium that requires exotic materials such as high chlorides?



#3 breizh

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Posted 11 April 2019 - 05:43 AM

Hi ,

I believe the unit of specific heat is in Btu/lb F because all the other values are expressed in "British units"   table 2

Anyway  1 cal/g C= 1 Btu/lb F

 

Breizh



#4 ABCDER

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Posted 11 April 2019 - 11:05 PM

I thought the material of the heater would largely depend on the medium being heated.

Since this is an electric heater, i pretty much think the material would be a steel, possibly SS316 would be my first thought.. 

Is there something you are aware of in the medium that requires exotic materials such as high chlorides?

Thanks for the time which you has spent on my question.

 

as you said, the material of the heater depends on the medium being heated. As a part of Pre-bid engineering, we are not supposed to have a wild guess regarding anything since it can have a cost impact on detailed engineering. Also, I believe that  whatever we deliver, should have a basis So, as a part of my new project, I am supposed to find my heater material. On discussion with my team, they suggested me to use the software Predict. Since I started using this, I came across the problem which I have mentioned above.

 

As you asked, the chloride content is 6745 ppm in the produced water in crude and the oxygen content is 4000ppb. Could you please specify the limit of chloride content and oxygen content for different materials. Hope you would suggest a material for the heater.

 

Thanks in advance


Edited by ABCDER, 12 April 2019 - 12:40 AM.


#5 ABCDER

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Posted 11 April 2019 - 11:17 PM

Hi ,

I believe the unit of specific heat is in Btu/lb F because all the other values are expressed in "British units"   table 2

Anyway  1 cal/g C= 1 Btu/lb F

 

Breizh

 

Thanks for the time which you had spent on my question.

 

As you said, I corrected the unit of specific heat.

 

Could you help me more in specific to my question ?

 

Thanks in advance



#6 breizh

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Posted 12 April 2019 - 12:02 AM

Hi ,

Because of chlorides , I 'm thinking  SAF 2205 .

Good luck

Breizh



#7 ABCDER

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Posted 12 April 2019 - 12:45 AM

Hi ,

Because of chlorides , I 'm thinking  SAF 2205 .

Good luck

Breizh

Thanks for your guidance.

 

since you have highlighted only the chloride content, there won't be any effect due to oxygen content?  Also could you please elaborate the limit of chloride content for different materials.

 

Thanks in advance



#8 breizh

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Posted 12 April 2019 - 01:30 AM

Hi,

For more information about Duplex material , let you download Sandwick's  brochure .

https://www.material...ik-saf-2205.pdf

By the way you still have possibility to contact them and request support .

 

in addition , a link about SS 

http://www.ssina.com...ons/design.html

 

Good luck , I cannot offer more.

Breizh


Edited by breizh, 12 April 2019 - 01:36 AM.


#9 ABCDER

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Posted 12 April 2019 - 03:36 AM

Hi,

For more information about Duplex material , let you download Sandwick's  brochure .

https://www.material...ik-saf-2205.pdf

By the way you still have possibility to contact them and request support .

 

in addition , a link about SS 

http://www.ssina.com...ons/design.html

 

Good luck , I cannot offer more.

Breizh

Thanks for your valuable info



#10 thorium90

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Posted 12 April 2019 - 08:58 AM

The temperature will also make a difference. Based on the pdf file, I think you are trying to keep the tank contents at 35C?

Based on the chlorides of 6475ppm and a temperature of 35C, I would agree that duplex steel 2205 would be more suitable than SS316.






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