The oxygen valve leakage causes and troubleshooting: 1. Fault phenomenon of oxygen pipe connection normal operation after about one year, appear the leakage phenomenon. ( 1) Special valve closed lax DN250mm oxygen. Although valves are closed, but in the downstream side of the flange of gas leakage. ( 2) Root crack DN100mm oxygen tossing in Industrial Valves. The main reason is because of this pipeline is located in the piston oxygen compressor outlet section, vibration is larger, long-term vibration in the valve at the bottom of the connecting pipe and the main crack, medium-pressure oxygen massive loss of potential safety problems. Due to large production lines with oxygen, and 3 sets of 21000 m3 / h in air separation equipment side not installed valves will supply oxygen air supply pipe network is cut off, temporarily have no time to eliminate the potential safety hazard. So temporary made a steel clamp, oxygen pipeline tossing in place for the temporary treatment, and within the scope of around 10 m set up temporary warning area. 2. Treatment measures and process of oxygen producing process maintenance such as steel, iron and stainless steel has been related to the main process of maintenance. To deal with the security hidden danger, specific measures as follows: ( 1) The original special DN250mm oxygen valve used as a pipe, valve is fully open all year long; And on both sides of the flange, ensure no flange joint leakage of oxygen. In the line to install a pressure of 614 mpa DN250mm oxygen special cut-off valve, the valve as normal operation with a shut-off valve ( Contact between valve) 。 ( 2) Repair welding tossing in pipe cracking, and fixed of the pipe and valve; Replacement of 6000 m3 / h oxygen air separation equipment to send pipeline three-way valve. Before construction, prepare the relevant materials and spare parts, and the argon arc welding machine, chain hoist, such as equipment shipped to the site, in advance to skim, silenced, contact new oxygen valve to Φ 273 mm x 8 mm carbon steel pipe, stainless steel three-way Industrial Valves 90 °, 45 ° Angle 45 ° and y-shaped three-way valve cleaning, degreasing, and grind the groove. , according to the pipeline construction site situation in pipe cutting and adding oxygen valve in, making mobile service platforms or build the scaffold. In advance to make new contact oxygen valve closure. In contact with new oxygen valve on the inlet side of the flange welding length about 115 m of stainless steel pipe, stainless steel pipe at the other end a 4 mpa, DN250mm flange welding. Early removal of the original 4 mpa, contact DN250mm oxygen valve on the north side, on the east side support beams, and will need to dismantle pipe bottom plate removal, as well as the platform, set up necessary support, guarantee the removal of pipeline to plummet. Contact with 12 mm steel plate to make the oxygen valve blind flange, blind flange diameter, slightly larger than the flange diameter on the blind flange according to the flange bolt hole size, punch a hole and tapping. Once at the same time, in order to prevent oxygen pipe gas cannot be ruled out entirely caused by accident, at the scene in advance to prepare two blowers, ensure timely in the wind on the scene. Premature release of 6000 m3 / h oxygen air separation equipment 4 oxygen compressor to inside of the valve flange, and make the oxygen with corresponding interval between each valve and flange for networking pipeline blow. In the construction, according to the pressure relief, replacement for 1 hour, 2 hours removed 6 hours, new valves and piping with 6 hours, scavenging for 1 hour, 1 hour and restoring the plenum suppress leak ( Smoke blind plate and gas) 1 hour program of construction organization, a total of 18 hours. After the discharge pressure, displacement, the 3-way valve (pos. No. 6 on the connected piping construction personnel m in oxygen compressor outlet piping and over 6000 m3 / h air separation equipment to take oxygen pipe 6 m, bevel pipe cutting. And in more than two cut set baffle, prevent contact oxygen valve flange apart after discharged into the pipe. Demolition of the original contact oxygen valve 6000 m3 / h side flange screw air separation equipment, release flange, tighten blind flange on the valve flange, ensure the blind flange don't fall off. After dismantle piping vertical drop, to prevent contact discharged into pipe, valve flange apart after oxygen keeps pipe two bevel cut set of baffle, dismantling the original contact oxygen valve closure. The stainless steel nipple and flange to contact with the addition of oxygen valve ( The Industrial Valves is in open state) Liaison with the oxygen valve flange connection. Determine the flange after fastening, slow close contact new oxygen valve, and in contact with new oxygen valve of 6000 m3 / h air separation equipment set up side blind flange. After the completion of construction, polishing the pipe joint and welding on the oxygen compressor outlet piping Φ 273 mm x 8 mm, 45 ° elbow and send oxygen piping Φ 273 mm x 8 mm, 45 ° y-shaped three-way valve. After welding, maintenance staff, in conjunction with the crane will contact new oxygen valve outlet flange ( Flange with the export pipeline welding in advance) Connected with the valve. After the connection, will export pipeline at the other end and 45 ° y-shaped three-way valve welding, at the same time the oxygen compressor outlet piping with 45 ° y-shaped three-way valve welding. 3. Effect after the completion of construction, to restore gas operation, the demolition of new contact oxygen valve closure, oxygen spherical tanks blind plate, restore the oxygen compressor to oxygen valve, open the new oxygen valve, pipe residual nitrogen in displacement with oxygen. After 10 minutes, tossing in pipe for gas composition test, qualified returned to normal after oxygen. The oxygen pipeline tossing in root crack treatment and add contact valves technology reform success.
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