Leaks/leakage flange

The gas that accumulates inside the surface condenser is called the noncondensable load to the steam jets. Some of the noncondensable load consists of C02 accidentally produced when the boiler feedwater is vaporized into steam. Air leaks through piping flanges and valves are other sources of noncondensable vapors. But the largest source of noncondensable vapors is often air drawn into the turbine case, through the shaft s mechanical seals. To minimize this source of leaks, 2 or 3 psig of steam pressure is ordinarily maintained around the seals. However, as the turbine s shaft seals deteriorate, air in-leakage problems can overwhelm the jet capacity. This will cause a loss of vacuum in the surface condenser. 

LESS OF Less Flow 9. Flange leakage or valve stub blanked but leaking Decreased absorption. Lower product make. Covered by a),c), and d). 

A test leak (shown below) consists of a quartz diffusion barrier of length 70 mm, internal diameter (wall thickness (d) 1 mm. If the reservoir contains 400 mbar He and discharges into a vacuum via the vacuum connection flange, calculate the leakage at 20 °C (/cperm quartz glass = 5 x 10-5 mbar L s"1 mm m-2 bar). 

Whenever possible, the drawoff sump should be positioned at the column shell to minimize internal piping. Internal flanges should be avoided in the draw lines, because these may leak and deprive the draw-off of liquid. One troublesome experience of such leakage has been described (237). 

Leakage is the major hazard when pumping caustic. It is most likely at piping joints, valves, and pump seals. Many systems use flange guards and valve covers where leaks could endanger personnel. Valves are most likely to leak at their stems. Blowout-proof... 

Air can leak into a system around flanged joints, valve stems, pump and agitator shaft seals, instrument connections, and the like. Leakage can also occur through metal porosities and cracks along weld seams. Air leakage is unavoidable in commercial systems. 

In the absence of appropriate monitors, localized leaks may be difficult to detect unless the gas is odorized. Therefore, periodic checks should be made of connections and joints, flanges, and components subject to leakage. 

Equipment. Release can occur when valves, flanges, pumps, and oil/gas separators become brittle leading to a possible leak due to a lack of maintenance or poor materials. Corrosion, caused by chemical reactions of water with metal and H2S, can also cause H2S leakage. 

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