Water Seal


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water seal

[′wȯd·ər ‚sēl]
(engineering)
A seal formed by water to prevent the passage of gas.

Water Seal

 

a hydraulic device that prevents the reverse flow of gases in piping. It is used in sanitary engineering to prevent the entry of sewer gases into premises through sanitary equipment (sinks, toilet bowls, and so on). In gas welding, the water seal prevents penetration of the blast wave from the welding torch into the acetylene generator (“blow-back”). Water seals are sometimes used as a safety device in steam power installations and gas holders.

In gas welding, acetylene enters the water seal (see Figure 1) via a pipe (1) that is filled with water up to the level of the test cock (3) and, passing through the layer of water, exits

Figure 1. Diagram of a water seal used during gas welding: (a) normal operation, (b) in case of“blowback”

toward the torches via valve (2). When the gaseous mixture in the torch explodes, the gas enters the water seal via valve (2) and forces the water into pipe (1), forming a water lock. The water level in the water seal drops, uncovering the lower end of pipe (4), and the gas escapes through this pipe into the atmosphere, drawing after it the water in the water seal, which is retained by panel (5). The water lock in pipe (1) prevents the blast wave from entering the welding generator.

water seal

The barrier to the passage of air through a trap, 1 in a drain, which is provided by water in the trap; a seal, 3.
References in periodicals archive ?
Kozlowski of Thompson's Water Seal noted that white decks and outdoor living remain very popular, there is a lot competing for the homeowner's attention and discretionary funds.
For the water seal main plots, a temporary sprinkler system was installed after the postfumigation tillage operation and intermittent water seals were applied: 0.
Thompson's Water Seal began supporting the Cave of the Winds Decks at Niagara Falls, USA.
If there are water seals at the ends of each pipe, the displaced smelly drain air can suck the water out of the seals and leak the smelly air into the bathroom.
This resulted in the backflow of water from the water seal upwards towards the ball-valve at the top of the water-seal column.
ATHE look is an illusion - in fact frameless showers do have frames and in most cases the edges of the glass panels have a translucent plastic water seal attached.
Concentric has unveiled new water seal, fan and oil pump systems for new diesel engines.
The new compact wet end includes a POMix compact stock processor for blending the stock ahead of the paper machine, one POMp 400 unit for degassing the white water from the wire pit, a POMlocks suction water seal pit, and a flexible cascade cleaner plant based on Cyclotech cleaners.
Recent developments are low perm, water seal and hydrophilic foams.
Its patented convection heating dynamics reportedly transfer heat more effectively, and the fully enclosed and insulated blancher chamber with hydrostatic water seal eliminates evaporation -- the primary cause of lost efficiency in steam blanchers.
In 1890, the plant consisted of four gas retort benches, hot scrubber, tar extractor, ammonia washer, naphthalene scrubber, four gas purifiers, and two 70 Mcf, two-stage water seal gas holders.
I sell to professional, industrial, commercial and retail customers, and my brands include my own name as well as Dutch Boy, Krylon, Minwax and Thompson's Water Seal.