Extended soak periods

Cleaning at lower temperatures is not recommended. Cleaning solutions are typically not effective at ambient temperatures and some components of the solution may even precipitate at these temperatures. Hence, a longer soak will not compensate for cleaning at lower temperatures. In fact, during extended soak periods at higher temperatures, a slow recirculation is recommended to maintain temperature. 

A typical two-stage RO skids can take 8-12 hours to clean, depending on the time it takes to heat up the cleaning chemical solutions. If an extended soak time is required, it can take even longer, up to 24 hours, including the soak period (see Chapter 13.2.2). Each stage in a skid should be cleaned independently of the other(s) so as not to contaminate one stage with foulants or scale from another, which is why it may take a day or so to clear an entire system. 

Extended shut-in is usually not a major concern in carbonate acidizing— at least not from the standpoint of unwanted reprecipitation reactions. However, it is best to prepare a well to be returned to production as soon as possible, if there is no reason to shut the well in or to allow for a soak period. Viscous acid systems, especially gels, should be produced back as soon as possible, especially at higher temperatures (>200°F). 

The soak time seems to have a less pronounced effect on porosity development during treatment at 800°C. A considerable porosity (VT = 1.04 cm3/g and Sbet = 2570 m2/g) is created within the early period of reaction and a limited change of the parameters occurs with prolonged heating to 3 h (Fig. 3a). Again, the widening of pores, as evidenced by an increase of both the mesopore ratio and the micropore width, is the most noticeable result of extended reaction time (Fig. 3b). 

For the reasons stated above, deep intrusion of degrading microbes into polysaccharide-plastic films is demonstrably and theoretically improbable. Since starch removal does occur when the films are buried in soil, the primary mechanism must be microbial production of amylase in or near a pore, diffusion of the enzyme into pores and diffusion of soluble digestion products back to the surface where they are metabolized (Figure 3). This mechanism would be the only choice when the pore diameter is too small to admit a microbial cell (i.e., at diameters < 0.5 /im). An alternative mechanism could be diffusion of a water-soluble polysaccharide to the film surface, at which point degradation would occur. None of the materials used in these investigations showed loss of starch even when soaked in water for extended periods with microbial inhibitors present. Therefore, diffusion of amylase to the substrate rather than diffusion of the substrate to the film surface is the more likely mechanism. 

Unfortunately, there are not many publicly released test results for portals (test results are generally classified). Testing is typically done by two methods. TSA testing is conducted using patches of cloth upon which calibrated quantities of explosives are deposited. These patches are adhered to various locations on people to test for collection and detection efficiency. The quantities of explosives placed on these patches represent levels of contamination the TSA has determined are typically for bomb carriers. Another method primarily used by overseas users is to place bulk explosives on individuals and test for the detection of actual contamination. In order for the test to be realistic, the concealed explosives must be on an individual sufficiently long for contamination to occur, though generally the soak time is only several minutes, rather than the more extended periods expected of an actual bomber. 

Hard water deposits could happen if assembled glassware is placed in a sink of water and left to soak for an extended period of time. 

Therefore, glassware should not soak in a base bath for an extended period of time, and the base bath should never be used for volumetric ware. 

This material can etch glass if it is left to soak for an extended period of time, therefore you might wish to select an old, worn beaker in which to do the mixing. You must use a glass beaker because of the exothermic reaction that is created when the mixture is first mixed. 

The whole system was soaked in water, counterions were added and molecular dynamics was conducted in periodic box. The final model of rhodopsin oligomer is shown on Figure 11-3. Phospholipids flow on the left and right side of the central double row in channels two phospholipids wide. Thinner channels one phospholipid wide, hidden below the extended cytoplasmic loops of TMH-V and TMH-VI, flow perpendicularly to the wider channels. 

Snap beans canned without NaCl were firmer, and their can liquor had less soluble pectin and Ca ", than was seen for beans where NaCl was present during canning. When beans, previously canned without added salts, were soaked for an extended period In their own can liquor augmented with NaCl the resulting soaked beans had an intermediate firmness and liquor Ca concentration between those of samples cooked with and without NaCl. No change was seen In the liquor pectin concentration from that seen when the snap beans had been cooked without NaCl,... 

In Vitro Studies. A series of elastomers were soaked in a 37°C synthetic plasma solution (Table I), based on a formulation developed by Carmen and Kahn (20), containing biologically important low molecular weight molecules in blood. The elastomer test samples were exposed to the synthetic plasma for periods extending from 20 weeks to one year. Gravimetric analysis was performed biweekly for 20 weeks and again at 52 weeks. 

In the majority of treated wells at Zybza Held, the amount of additional oil produced upon repetition of the steam soak showed a decrease from the amount of additional oil produced during the first treatment. In this study, the steam soak was systematically repeated over an extended period of time on 30 oil wells. The aim was to determine the ultimate effectiveness of a treatment restricted to the near bottomhole zone, and to determine the maximum final recovery of oil by this method. Altogether 73 individual "huff and puff" treatments were carried out in seven cycles. Not all of the 30 wells were treated during each successive cycle (Table 16). 

Some extractions take the form of oils. Herbal oil is prepared by soaking the dried herb in olive oil or vegetable oil and heating the herb for an extended period of time. Oils promote the concentration of the therapeutic material and, if properly stored, extend the therapeutic life of the material for months. 

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