. Management of dairy plants . Dairying. 42 MANAGEMENT OF DAIRY PLANTS the water seal enough to permit passage of gas. When this does occur, the gas usually passes in the form of bubbles and can be detected in that way. 2. Excessive suction may draw so much water out of the trap that the remainder faUs to act as a seal. 3. By evaporation, the water seal may be so lowered that gas is allowed to pass. 4. By absorption, the water may take up gas on the sewer side and liberate it on the house side. 2. Siphon Trap. — This is per- haps the most satisfactory of traps to be ventilated. The ventilator
. Management of dairy plants . Dairying. 42 MANAGEMENT OF DAIRY PLANTS the water seal enough to permit passage of gas. When this does occur, the gas usually passes in the form of bubbles and can be detected in that way. 2. Excessive suction may draw so much water out of the trap that the remainder faUs to act as a seal. 3. By evaporation, the water seal may be so lowered that gas is allowed to pass. 4. By absorption, the water may take up gas on the sewer side and liberate it on the house side. 2. Siphon Trap. — This is per- haps the most satisfactory of traps to be ventilated. The ventilator should be the same size as the pipe composing the drain. It is placed in the second curvature of the siphon. It is most satisfactory to place the ventilated trap in a local sewer before that enters the main sewer. Bell traps will then usually suffice for the floor traps. 3. S-Shapcd Trap. — This type, which can be ventilated, is used frequently under sinks and to some extent, also, in the main sewer system. Catch Basin. — It is well to have the large drain that leads out of a creamery connect with a catch basin a short distance from the building. This basin should be round, about 3 feet in diameter, and from 5 to 7 feet deep, depending on the slope of the ground. It may be built from either concrete or brick as happens to be most convenient. Its use is to catch all heavy materials, such as sand, nails, etc.; for this purpose, the bottom of the basin should be from 2 to 4 feet lower than the tile that carries the drainage away from it. This catch basin may be covered with plank and about a foot of dirt, thus preventing any odors from escaping. It should be inspected once or twice a year to make sure that it is in good working order. If filled up to any extent, it should be cleaned — the work of only a few Fig. 7. — Siphon Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdairyin, bookyear1921
