Bursting heat transfer jackets due to thermal variation
Bursting heat transfer jackets due to thermal variation
(OP)
In my company, each reactor has a jacket through which steam, cooling water & Brine (-30 deg. celsius ,CaCl2) is passed for process heating or cooling. this resuls in the jacket piping being subjected to excessive thermal variation. Also , Brine ( CaCl2) is highly corrosive to MS piping. Could you help me regarding the choice of material that I must use for these jackets and the type of weld joints.
Thanks
mgindia@indiatimes.com
Thanks
mgindia@indiatimes.com





RE: Bursting heat transfer jackets due to thermal variation
A plain jacket with large corrosion allowance could work, but will result in a very heavy expensive vessel.
Don't even consider a dimpled jacket. These WILL FAIL in alternating steam / water service. Thermal shock and/or waterhammer breaks the dimple welds. These will not always cause external leaks, and can crush the inner vessel if enough dimple welds fail.
RE: Bursting heat transfer jackets due to thermal variation
RE: Bursting heat transfer jackets due to thermal variation
A couple of comments here, I believe, are necessary...
- Is a "brine", a highly corrosive liquid, the best choice for a heat transfer fluid ? This does not sound like a good choice to me. Many chemical companies use a glycol liquid for jacketed vessels in heating and cooling service.
- The use of steam in a vessel jacket will lead to "hot spots" and venting problems. Usually, an injection heater that will mix steam with water is a better solution for a heating system design. ( Go to the PICK Heater website www.pickheaters.com or see "Chemical Engineering Progress" magazine - June 1997 issue)
- What the heck is "MS" piping ?? Main Steam ?
Keep us informed....
MJC
RE: Bursting heat transfer jackets due to thermal variation
As MJC points out, some of the design decisions in this arrangement seem doomed from the start. Maybe this is a better case of what not to do than a system with the hope of some convenient remedy.