Tantalum Tubes for shell and Tube HX- code and Testing Info
Tantalum Tubes for shell and Tube HX- code and Testing Info
(OP)
Hello All,
I am a Green Horn, Mechanical Engg.(10 month old in Proff.career). I am preparing Eng-Specification for the shell and Tube Heat exchanger.
This one is small size exchanger(AEL Type-Shell & tube 1 Pass each) ( over all Surface area 143 sq.ft) w/Tube Length 10 ft , No of Tubes =109) Design temp= 250 dg F and Design press= 150 psig /FV(shell side) & 150 psig (Tube side).
Material's are as follows:
Tubes: Tantalum
Shell: Carbon steel
Tubesheet: Haste alloy C276 (Claded with Tantalum)
Flanges & Channels: Haste Alloys w/ Tantalum Liner
Here are the Array of questions:
1) What should I include in my Eng-Spec as far as testing for the Tantalum tubes are concern. What are the important point’s should i need to include in my specification, concerned to the Tantalum Tubes Testing, Welding. Is there any special procedure that I need to include in my specification?
2) I am looking at two options for Tube sheet?
* Clade the Haste alloy C276 Tube sheet w/ Tantulum
* Is it okay to weld overlay to the Tube Sheet instead?
* Lines the Tube sheet w/ Tantalum (Is this same as cladding??)
Which option is much better and cheaper?
Please Guide.
Thanks a lot in advance.
Mechmania
I am a Green Horn, Mechanical Engg.(10 month old in Proff.career). I am preparing Eng-Specification for the shell and Tube Heat exchanger.
This one is small size exchanger(AEL Type-Shell & tube 1 Pass each) ( over all Surface area 143 sq.ft) w/Tube Length 10 ft , No of Tubes =109) Design temp= 250 dg F and Design press= 150 psig /FV(shell side) & 150 psig (Tube side).
Material's are as follows:
Tubes: Tantalum
Shell: Carbon steel
Tubesheet: Haste alloy C276 (Claded with Tantalum)
Flanges & Channels: Haste Alloys w/ Tantalum Liner
Here are the Array of questions:
1) What should I include in my Eng-Spec as far as testing for the Tantalum tubes are concern. What are the important point’s should i need to include in my specification, concerned to the Tantalum Tubes Testing, Welding. Is there any special procedure that I need to include in my specification?
2) I am looking at two options for Tube sheet?
* Clade the Haste alloy C276 Tube sheet w/ Tantulum
* Is it okay to weld overlay to the Tube Sheet instead?
* Lines the Tube sheet w/ Tantalum (Is this same as cladding??)
Which option is much better and cheaper?
Please Guide.
Thanks a lot in advance.
Mechmania
RE: Tantalum Tubes for shell and Tube HX- code and Testing Info
For your engineering specification, you need to be specific regarding tube material. Reference an ASTM material specification (for example ASTM B521-98) which is "Standard Specification for Tantalum and Tantalum Alloy Seamless and Welded Tubes”. Purchase and review this Standard Specification carefully - if you have any supplemental requirements you may want to consider invoking them in your Specification.
A weld overlay on the tubesheet would be my preference over cladding. Explosive cladding may be an option. Will the Ta tubes be seal welded to the tubesheet?
I would suggest you contact one or more chemical heat exchanger references to provide input to your specification.
http://www.titanmf.com/products/chemical/
dynamicmaterials.com/data/brochures/8-Wah Chang Zr clad paper 8-99.pdf
http://www.stoneprocess.com/
http://
RE: Tantalum Tubes for shell and Tube HX- code and Testing Info
All of the Ta units that I have seen were explosive bonded.
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http://www.trent-tube.com/contact/Tech_Assist.cfm