Canister walls

Figure 11.26 shows a component removed from an air-conditioning compressor. Pinhole perforations in this component had allowed cooling water to leak into the freon. Many failures of this type had occurred previously. Examinations of the internal surfaces of both the canister and the tubes entering it revealed evidence of metal loss. Tiny perforations at the bases of deep grooves were noted in the tubes. Deep, general, smooth metal loss surrounded irregular islands of intact surface (Fig. 11.27). The canister walls displayed a similar metal loss and comet-tail-shaped depressions (Fig. 11.2).

Thermal expansion has to be looked on under one more aspect. Different expansion coefflcients of glass and canister material may cause stress in the canister wall. It has been observed that this may signiflcantly promote corrosion of the canister. 

Abstract The bentonite layer, which surrounds the canisters in a nuclear waste repository deep down in rock, experiences an initial drying and a resaturation from the outer rock side. These complex processes interact and a key question is the degree of initial drying and the time it takes to resaturate the bentonite. It is shown that the highly non-linear coupled equations may, when formulated in a special way, be linearized with a loss of accuracy of some 10% only. The paper presents an analytical solution for the linearized case. The solution involves two key parameters only, a time scale and thermodiffusive parameter a. The largest drying at the canister wall and the resaturation are obtained from a single set of curves with a dimensionless time and a as parameter. 

The moisture balance equation for water saturation S(r,t) in the radial case for the annular region between canister wall (r = ) and rock (r,) reads... 

The largest drying and the slowest resaturation occur at the canister wall r-r. The degree of saturation at the wall is from (12), (13) and (15)... 

Figure 4. The function

The detector used to measure indoor radon was the latest version of the passive activated carbon device developed at EML (George, 1984 Warner, 1986), which consists of a thin-walled aluminum canister with a screen cover to expose 80 g of carbon to the test atmosphere. Although not as physically rugged as earlier models, properly packed this monitoring device was as successful in conducting the surveys through the mail. 

The actuation chamber is made from stainless steel. It houses the canister within its adapter sleeve during dosing. A smooth surface provides a face seal between canister valve stem tip and sample injection passage. The close tolerance between the external wall of the adapter and the internal wall of the actuation chamber induces a partial vacuum which creates a controlled pumping action causing sample methanol to flush the injection passage after each dose. A replaceable 16 gauge needle fits onto a standard luer tapered tip. 

Loss of some organics to the walls of the canisters can occur, and these can subsequently desorb. Such negative changes depend on the nature, past use, and pretreatment of the canister surface, the nature of the compound, the canister pressure, the storage temperature, and interestingly, the water vapor present. The loss of organics to the walls is generally less in the presence of water, which has been attributed to water... 

Gaseous samples are typically taken by means of isolation techniques (using gas pipettes, ampoules, plastic bags, or canisters with walls lined with an inactive polymer) or aspiration techniques (absorption on solid sorbents or in appropriate... 

Figure 5.4. Hydrogen accident in Stockholm street 1983 (a, above), and analysis (b) of flow pattern and H2 concentration (shaded areas) after 10 s in a vertical plane halfway between the canisters on the truck and the building wall. (From A. Venet-sanos, T. Huld, P. Adams, J. Bartzis (2003).. Hazardous Mat. A105,1-25. Used by permission from Elsevier.)...

THREE. Adjust tiie mask to the face. Then pinch together the walls of the hose just above the canister nossle and inhale (Fig. 130-3). 

In the home Molded chairs Mattresses Decorative laminates Vinyl wall coverings Washbowls Canisters for food Buckets... 

Fire blankets For clothing fires, use the wall-mounted blanket accessible with a loop for inserting your arm. Insert your arm and rotate your body such that the container opens and the blanket wraps around you. For benchtop fires, remove the blanket from the wall-mounted canister through the bottom door, unroll, and cover the fire. 

A second method of sample acquisition, based on use of a solid-phase adsorbent as an analyte trap, is widely used for low volatility species that are less suitable for sampling using canister methods because of the increased capacity of analyte condensation on the container walls. The adsorbent used in the trap is chosen in such a way to introduce an element of selectivity to the trapping mechanism, although in practice a trap-all approach is commonly used. 

In the spray calciner, liquid waste is pumped to a nozzle at the top of the calciner where it is atomized by pressurized air, producing droplets with diameters less than 70 irni that are dried and calcined in-fli t in the 700 C-wall-temperature spray chamber. Sintered stainless steel dust filters collect a portion of the powder with a mean diameter of 10 fjm. They are periodically cleaned by a reverse pulse of air. Calcine from the spray chambers and filters drops directly into the melting canister. Frit is fed to the cone of the calciner. 

Abstract Results from the four-year long heating phase of the Drift-Scale Heater Test at the Exploratory Studies Facility at Yucca Mountain, Nevada, provide a basis to evaluate conceptual and numerical models used to simulate thermal-hydrological coupled processes expected to occur at the proposed repository. A three-dimensional numerical model was built to perform the analyses. All model simulations were predicated on a dual (fracture and matrix) continuum conceptualization. A 20-percent reduction in the canister heat load to account for conduction and radiation heat loss through the bulkhead, a constant pressure boundary condition at the drift wall, and inclusion of the active fracture model to account for a reduction in the number of fractures that were hydraulically active provided the best agreement between model results and observed temperatures. The views expressed herein are preliminary and do not constitute a final judgment of the matter addressed or of the acceptability of its use in a license application... 

---