Level glasses

Failures of level glasses and sight glasses have caused many serious incidents. A leak of ethylene and an explosion that destroyed a plant may have been due to a level glass failure [2],... 

Pull a vacuum (15 in Hg) on the solvent storage tank, and charge with solvent by sucking it from the appropriate drum. Check the tank level using the level glass. Periodically check the air for toluene by using colorimetric tubes. 

Table 3.5 shows some examples of the property effect ratios for mineral filler-reinforced polypropylene. The effect ratio is the performance of the reinforced polymer divided by the performance of the neat polymer. Properties of low-level glass fibre reinforced polypropylene are given for comparison. 

Add A level glass shall be provided in accordance with ISO 10438-3... 

What is the difference between a gauge glass and a level glass Simple There is no such thing as a level glass. The liquid level shown in a... 

The sample sheets were prepared by pouring a 10% solution of Kraton 102 in the appropriate solvent into a carefully leveled glass tray with a piece of plate glass cemented to the bottom. The entire tray was placed on a composite cork-rubber cushion to help damp out vibrations. The tray was covered with a piece of cardboard with numerous pinholes to allow the solvent to evaporate. After several days the sheet was removed and kept at room temperature for two weeks before strips were cut. To check for residual solvent, several strips were preweighed and then exposed to vacuum at room temperature for 48 hours. No change in weight was observed. 

Two-level glass etch was also performed first over photoresist for shallow etch (10 pm), and then over black lithographical masking tape for deep etch [117]. 

Reduction in the water holding capacity of the corneum can also make the corneocyte proteins brittle and vulnerable to cracking. Keratins in the corneum have a glass transition temperature just below the body temperature28 and this is sensitive to humidity levels. Glass transition temperature is the point below which the material is brittle. As the humidity/water content of the SC decreases, glass transition temperature increases to values above the body temperature thus making the corneocytes brittle at body temperature. 

An instrument used to indicate relative intensity of ground vibration. It consists of a level glass plate on which a series of 1//4" diameter steel pins (6" to 15" lengths) stand upright inside of metal tubes. The use of the falling pin seismometer is based on the theory that the length of the pin toppled depends upon the amount of ground vibration present. 

Rising level glass and in-pot melting (Developed at ORNL and Hanford)... 

Single boreholes in the floors of galleries are provided to hold high-level glass cylinders. The cylinders are carried in heavily shielded casks and are then lowered into the boreholes. Single boreholes can be arranged in a way that the heat is sufficiently dissipated to maintain maximum permissible peak temperatures in the salt,... 

Bradley, D. J. Leaching of Fully Radioactive High-Level Glass, Report PNL-2664, 1978. Burkholder, H. C., et al. Incentives for Partitioning"High-Level Waste, NucL TechnoL 31 202 (1976). 

Figure 5.3 Piping arrangements for level glasses, (a) Correct location for glass (6) glass below lower nozzle (c) glass above upper nozzle. Henry Z. Kister, excerpted by special permission from Chemical Engineering, July 28, 1980, copyright by McGraw-Hill, Inc., New York. NY 10020.)...

Figure 5.5 Recommended practice of installing ball check valves to isolate a level glass. (What Went Wrong Second Edition, by Trevor A. Kletz. Copyright 1988 by Gulf Publishing Company, Houston, TX. Used with permission. All rights reserved.)...

An armored level glass technique (Fig. 14.12c), which is capable of duplicating plant conditions of temperature, pressure, and composition. The level glass can be mounted either in the laboratory (50) or in the field (203). This technique is more reliable than any of the above, as it reproduces actual plant conditions. Both case histories above reported success with this technique where other techniques failed. 

Howlader, M. M. R., Suehara, S., and Suga, T., Room temperature wafer level glass/glass bonding. Sensors and Actuators A-Physical 127, 31-36, 2006. 

Plugged settler level glass Erratic reactor pressure control... 

Next, check the interface level. You may find that the level glass keeps filling up with a dirty-looking emulsion, no matter how many times it has been blown down. If so, you have found the cause of the carry-over. A layer of emulsified material consisting of heavy hydrocarbons, dirt, and amine has accumulated at the interface. Because its density is less than... 

A boiler generating 600-psi steam was destroyed when a laborer, cleaning up around the boiler s feed water pump, accidentally pushed the pump s stop button. The water level in the boiler started dropping. The low-level alarm sounded in the control room. An operator was duly dispatched to investigate. He reported that the liquid level glass was either completely full or empty (i.e., he could not see any interface). The chief operator went out to check for himself. Shortly thereafter, a boiler tube ruptured and high-pressure steam escaped into the fire side. 

Diffusion Studies. Diffusion membranes were prepared by spreading a chloroform solution of the polymer on a flat, level glass plate with a 2 inch wide Gardner adjustable knife (Gardner Labs). The membranes were air dried overnight. The dry membrane was hydrated with deionized water for 30 min. then removed from the glass plate and supported on a Mylar sheet. The thickness of the hydrated film was measured with a micrometer while on the support. Membranes -10 pm thick were used for the diffusion studies. 

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