BF3 handling systems have to be designed and constructed to endure high pressure and also corrosion. Normally these systems are developed for an Optimum Allowable Working Pressure (MAWP) of 3,000 psig. BF3 is a Lewis acid gas as well as is exceptionally hygroscopic in nature. In the presence of also trace amounts of moisture, Boron Trifluoride creates acidic BF3 hydrates which will swiftly corrode typical steels. The solid metal deposits can be brushed up downstream and also cause fouling and/or pluggage of stress regulatory authorities and also control valves. All BF3 service lines have to therefore be protected from wetness when not being used.
The adhering to devices and also materials of building and construction are recommended for BF3 handling systems:
Piping
As a result of the possibility of moisture contamination, BF3 feed systems are generally fabricated of timetable 80 kind 316L stainless steel pipe to supply long term deterioration resistance.
Installations
Pipe fittings need to be of type 316L stainless steel building and construction. Butt weld fittings are preferred over screwed installations. Socket weld as well as compression installations are to be avoided.
Where feasible the variety of joints should be decreased. Threaded links can best be sealed utilizing a white lead pipeline joint compound over tape.
Trailer Connection Lines
Seamless kind 316L stainless steel tubing with a 3/8" O.D. x 0.065" wall surface thickness and an electropolished I.D. is suggested. End fittings must be butt bonded, preferably by the automatic orbital welding tungsten inert gas (TIG) procedure.
Gaskets
▸ for stress less than 300 psig metal strengthened PTFE gaskets.
▸ for stress more than 300 psig nickel-graphite spiral wound gaskets.
▸ for CGA 330 connections, 1/16" thick gaskets are preferred.
CARE: Natural or artificial rubber gaskets are not appropriate for BF3 service. Shutoffs in BF3 solution should be correctly created from a rust, pressure as well as temperature level cycling point ofview. Shutoffs may be of stainless-steel, light weight aluminum silicon bronze or monel building.
System Maintenance and also Evaluation
Visually evaluate all procedure lines and equipment on a routine, scheduled basis. Any kind of problem or sign of deterioration need to be remedied immediately. Prior to executing maintenance on any kind of BF3 process line, the area must be isolated, removed with an inert gas or completely dry air, and depressurized to ambient stress. Lines as well as equipment may fume when revealed to the atmosphere although an inert cleanup and depressurization were correctly carried out. Added line flushing with a solvent or water or line emptying might be required. Use of an adaptable line, appropriately tired to a scrubber might be practical in eliminating fumes from an initial line breaking.
Whenever feasible, stay clear of the introduction of water right into BF3 piping systems. All lines must be properly dried prior to reintroduction of a BF3 gas stream, as a result of the corrosion items that may form in the existence of water. Lines need to be steamed until the condensate is clear adhered to instantly by a dry, inert gas cleanup. A hydrophilic solvent flush (e.g. acetone) might also be used, adhered to by a hot, completely dry inert gas purge to get rid of all of the solvent. Lastly, a vacuum cleaner ought to be related to the system to eliminate wetness from holes which might be untouched by inert gas or solvent purge.
If range or rust deposits end up being a problem, the system might be heavy steam cleaned supplied the system is appropriately dried as described over. Routine heavy steam cleaning of BF3 process lines need to be avoided. Instead, count on appropriate completely dry, inert gas removes frequently before and also after upkeep and between BF3 supply adjustments to decrease deterioration as well as to avoid the formation of corrosion product range.
Safety and security precautions
Boron Trifluoride is irritating to the skin, eyes, as well as mucous membranes as well as may cause thermal or chemical burns. The burns are caused by the formation of the solid acid, Fluoroboric Acid upon reaction of BF3 with moisture on the skin. Breathing of BF3 gas is extremely suffocating as well as irritating to the breathing system. Prolonged breathing of vapors might cause severe poisonous results.
While acid haze air purifying respirators have been located to be efficient security against direct exposures to problem levels of BF3, air birthed concentrations are extremely hard to measure. It is for that reason suggested that a full face respirator with provided air be used where the possibility for breathing of BF3 vapor exists.
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