Gas-seal testing of a floating-drum plant
In the case of floating-drum plant, only the metal gasholder must be subjected to gas seal testing;
any leaks are detected with the aid of soap water.
Fig. 7.1: Water-seal testing of a digester. 1
Fill the plant with water, Check the fill
levels: 21 Inlet no water in the mixing pit,
22 Digester - at least 10 cm neck height
above water level. 3 Refill to compensate
for moisture absorbed by the masonry. 31
Mark the water level. 4 Measure the drop
in water level as basis for calculating the
water loss (W1 = p r² X h). 5 Repeat
measurements as necessary. (Source:
OEKOTOP)
Fig. 7.2: Seal testing (water and gas) of a
fixed-dome plant. 1 Fill the plant up to the
zero line; Check the fill levels: 21 Gas
extraction points at least 10 cm above
discharge level, 22 Water level in the
displacement pit. 3 Perform water-seal
test and level-drop check (cf. fig. 7.1). 4
Close the entry hatch. 5 Fill with gas up to
maximum a1lowable plant pressure a)
with air (pump), b) with exhaust gas
(vehicle exhaust), 51 . . . until the
displacement pit overflows, or 52 . . . until gas bubbles out of the inlet pipe. 6 Refill the plant to
compensate for saturation losses. 7 Measure the level drop (h) after one day, and calculate the gas
losses. (Source: OEKOTOP)
Fig. 7.3: Gas-seal testing of a metal
gasholder. 1 Place the gasholder in
position with the gas valve closed. 2 Mark
the top edge of the digester neck on the
gasholder. 3 Check the location of the
mark one day later. 4 If the mark is found
to have dropped by 1-3 cm, use soapy
water to check for leaks in the gasholder.
(Source: OEKOTOP)
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