Dirt pockets

A further problem is that heating coils generally are located at the lowest point of the domestic HW heating system and act as dirt pockets for the accumulation of general dirt and debris, as well as corrosion products resulting from the various points of galvanic corrosion that inevitably takes place. 

External coil problems White calcium carbonate CaC03 Phosphate scale from threshold agents. Blue/green/black copper phosphate trihydrate Cu3(P04)2 3H20 Dirt pockets due to low level of coil. BW sludgei settles on external fins. Gasket weeping from inhibitor. Color stains from inhibitor dyes. 

Temporary circulation pumps are often necessary, as permanently installed pumps may be unsuitable or unable to provide the velocity necessary for flushing and cleaning work. Typically the water velocity necessary is 6 to 9 ft/sec (2 to 3 m/sec). Once in motion, debris velocity is virtually independent of particle size, but is clearly a function of water velocity. Relatively high velocities are needed to lift particles up from horizontal pipe surfaces and dirt pockets (dirt collection points at the base of riser pipes), and especially to overcome problems of particle retardation when moving from the horizontal through a vertically upward bend. Special provisions may need to be made to ensure the cleaning of dead-leg areas,... 

It is standard practice to provide a chamfer at the inside edges of tube holes in tiibe sheets to prevent cutting of the tubes and to remove burrs produced by drilling or reaming the tube sheet. In the lower tube sheet of vertical units this chamfer serves as a pocket to collect material, dirt, etc., and to serve as a corrosion center. 

Avoid loops or pockets that could collect vapor or dirt. 

No socket welding or other pockets that can accumulate dirt downstream of filter. 

Derham said of this phosphorus, I saw some of it, press d widi a Quill that was cut, and it fired Gun-powder about it. Mr. Concle [Kunckel ] writ also with it on Paper, and the Letters all shined in the Dark.. . . My Author says he had once wrapp d up a Knob in Wax, at Hanover, and it being in his Pocket, and he busy near die Fire, die very Heat set it in Flame, and bum d all his Cloaths, and his Fingers also for diough he rubbed diem in die Dirt, notiling would quench it, unless he had had Water, he was ill for 15 Days, and the Skin came off.. . ... 

She s Garudin s personal assistant for one thing. She must know bucketloads of dirt on his operations. And for another Fitz rummaged in a pocket and produced what looked like a painted miniature - she s the spit of this little lady. ... 

Fortunately, organic dirt deposits still exist underground, in pockets beneath the lava rock. These dirt deposits would be useful for growing food. A sufficient air supply, plant nutrients, and light will also be necessary in order to grow food. 

Methane formed millions of years ago from microscopic underwater plants and bacteria that dropped to the bottom of the ocean when they died. Over millions of years, they were crushed and heated by the pressure of layers of sand, dirt, and other materials that accumulated on top of them. The mineral components of the undersea mud gradually turned into a type of rock known as shale. Some of the organic components turned into natural gas, which is mostly methane. The natural gas became trapped in porous rocks called reservoir rocks and in larger pockets of the rock called reservoirs or geologic traps. Natural gas is now found in... 

Examine textiles for excessive dirt, particularly at collars, pockets, sleeves, and trouser legs. If textiles are to be dry cleaned check them particularly for stains originating from food or body secretions. 

The design of the system should eliminate all possible areas where water, dirt, and corrosion products can accumulate. The degree of shelter from particle fallout and rainfall can affect initial and ultimate corrosion rates. When pockets are present the time of wetness increases, which leads to corrosive conditions. The design should make maximum use of exposure to the weather. Sheltering from rain should be avoided. 

Avoid sharp corners, edges and pockets where dirt or debris could be collected. 

The observed structure of micelles permits the rationalization of the solubilization property of aqueous solutions of amphiphilic compounds. The interior of the micelles can be thought of as small pockets of essentially pure liquid hydrocarbon. The interiors of the micelles, the pockets of hydrocarbon, are then capable of dissolving other lipophilic or hydrophobic molecules added to the solution. The action of soap in cleansing materials of oily or greasy dirt or soil is precisely of this nature. 

---