Foot conditions

Dial-indicator readings taken as part of the alignment procedure can be different each time the hold-down nuts are tightened, loosened, and retightened. This can be extremely frustrating because each attempted correction can cause a soft-foot condition in another location. 

Move the dial indicator and holder to the next foot to be checked and repeat the process. Note The nuts on all of the other feet must remain securely tightened when a foot is being checked for a soft-foot condition. 

Referral for foot conditions is indicated in toenail involvement, diabetic patients and where foot colour and appearance are abnormal. 

The contractor is paid per foot drilled. Whilst this will provide an incentive to make hole quickly, the same risks are involved as in the turnkey contract. Footage contracts are often used for the section above the prospective reservoir where hole conditions are less crucial from an evaluation or production point of view. 

V (separator) = Separator vapor velocity evaluated for the gas or vapor at flotving conditions, ft/sec V = Vapor velocity entering unit, lbs, per minute per square foot of inlet pipe cross section Va = Maximum allowable vapor velocity across inlet face of mesh calculated by relation, ft/sec Van Actual operating superficial gas velocity, ft/sec or ft/min, for tvire mesh pad Vu = Design vapor velocity (or selected design value), ft/sec... 

For tanks with a capacity of 20,000 barrels or more, the requirements for the vacuum condition are very close to the theoretically computed value of 2 cubic feet of air per hour per square foot of total shell and roof area. For tanks with a capacity of less than 20.000 barrels, the requirements for the vacuum condition have been based on 1 cubic foot of free air per hour for each barrel of tank capacity. This is substantially equivalent to a mean rate of vapor-space-temperature change of 1(X)F per hour. 

Lobo et al. [47] proposed the packing factor, F, and experimentally determined that it better represented the data than the calculated a/e term. Values calculated using surface area per cubic foot and percent free gas space from manufacturer s tables can be as much as 40% off. The ralues are dependent upon the method of packing the tower, i.e., dry dumped, wet dumped, or wet dumped and shaken. The latter condition may approximate the situation after a tower has been running a while and the packing settled. 

As an alternate consideration, assume various pressure drops/foot of packing (same) and determine effect on calculated column diameter. Use the same input information as original stated conditions, then ... 

For certoin conditions, exchongers con be furnished with 12 foot long tubes. See selection chort. 

Foundations must consider ground conditions, location preparation, and supplemental footing as required to provide a stable base for mast erection and to support the mast during the most extreme loading encountered. A recommended location preparation to provide ground conditions for safe operations is shown in Figure 4-6. 

Acrylic resin systems developed in Germany are similar to polyester resins but, by careful formulation, the problems due to shrinkage have been largely overcome. The acrylic resin-based systems are currently based on highly flammable materials (flash point 10°C), which can present hazards during laying. However, there are systems available that can take foot traffic 2-3 hours after application and full service conditions within 24 hours, even at very low temperatures. 

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