Leakproof Envelope Around Pipe Having High Pressure Ammonia

Epoxy adhesives are very versatile.

High pressure Ammonia... I do not think that you want that to leak. Google "on line leaksealing". Hope that can help you. In South Africa it is widely used (sure world wide too). If you want more info you are welcome to get incontact with me.

Yes Dear,

I have clearly mentioned that the pipe contains high pressure Ammonia, so it can not be subjected to high temperature welding ( arc or gas welding), neither I wish, Ammonia to leak nor is there any arrangement for refilling Ammonia in the system. Suggested links like "On line leaksealing" does not help just because there is no leak, untilt we try to weld the MS envelope to the pipe and make it brust.

Dr. N P Singh

On line leak sealing uses clamps to fasten brackets/metal sheets/containers/boxes around pipes that leaks/are about to leak/broke.

On line leak sealing can be used on a variety of pipes and material types and uses no heat/welding what so ever.

Ammonia

More info is required...what is the pressure on the Amm.?, what is flow rate?, what is the diam of the pipe and number of valves (if any)...why do you think it is leaking

Who design the equipment which cannot be shutdown/shutin? and that cannot be re-filled??

Why do you need to use Mild Steel???

Consider the direct application of epoxy resins and fiber to the pipe (on-line sealing), then place a good Epoxy/Fiberglass shell around closed off at each end before the next flange, then injection stryofoam (polystrene) in the annulus - provide an injection point and then pipe the injection opening out of the building if the system is in a building...periodically put the vent pipe through a water or any NHOH reactive mixture to see if you are getting any pH or reaction changes...DON'T use your NOSE.

TOM

Dear TOM,

Thanks for replying. Additional information is given below.

Pressure inside the pipe is 60 Kg/cm² . Flow rate does not matter. Pipe diameter is half inch. No valve involved.

I do not think it is leaking because it is leaking infact from the point where gap between the pipe and envelope is filled by soldering. Precisely the leaking is pin pointed between pipe and soldering material. Who so ever designed the machine, made it perfect, it is only me who is trying to modify it, to meet my requirement. Definitely the refilling can be done but the nearest station where the person is ready to refill the machine is 1500 Kms from my place.

I wish to use Mild steel so that the envelope can be made easily and the envelpe is already in place.

Please read the request carefully, I have clearly mentioned that the temp. requirement of 160- 170 deg.Cels. If you think any epoxy rein or fiber glass can withstand the mentioned temp. then I may try your sugesstion. Pl confirm.

Regards-

Dr N P Singh

I am an old Saggour (MP) wala and believe I know your condition. Many of the epoxies can withstand the temp and pressures (maybe)...A hot patch is difficult because of the curing time...and the small diameter 1.27cm OD ??

As an example check this or other web sites - muffle repair epoxy http://www.caswellplating.com/permatex/permrepairprods.html or other muffler repair kits you may have available at your location??

Elsewise try a pipe split on one side - clean-clean inner pipe - enclose smaller pipe in outer split pipe - weld outer split pipe - plug one end but leave a small hole to vent and fill with epoxy from the other end under pressure with ice/cold water over the outer pipe for curing cooler and hope

TOM