Loss of Ventilation

Other wastes generate H2 and loss of ventilation may cause an explosive atmosphere. Control systems are needed to ensure concentrations are maintained at safe levels. 

Momentary power failure and subsequent loss of ventilation in the MDB. No confirmed agent detected in Category C areas. Corrective action JACADS on own separate power distribution system. 

Stack exhaust fans 4 5 (Transports the ventilation system filtered exhaust out of the HCF stack and controls flow rate through the stack HEPA filter.) Shutdown due to loss of electrical power, fen electrical failure, or plugged HEPA filter Onsite or offeite electrical or mechanical malfunction Control and monitoring system indications and periodic maintenance inspections Two parallel fens provide redundant flow. Complete loss of ventilation flow if both fens stop. Loss of flow forces shutdown of HCF ventilation system. 

The Zone 1 exhaust will remain open in the event of loss of power, and because of Its direct connection to the TA-V stack, a minimum negative pressure would be expected to be maintained in Zone 1, even in the event of loss of ventilation flow. Thus there is a tendency for the Zone 1 air to be drawn through the exhaust line and filtered before it is released. This effect has not been considered or credited in the analyses described below. 

Flight control computers must be particularly robust. They are protected against overvoltage, under-voltage, electromagnetic attacks, the indirect effects of lightning, various vibrations, shocks, etc. The computers are cooled by a ventilation system, but can operate correctly even in case of loss of ventilation. 

Conditions with the potential to functionally degrade the performance of safety systems and for which provisions have been made to retain the capability for performing safety functions (e.g. missile impact, pipe break, lire, loss of ventilation, spurious operation of fire suppression systems, operator error, failure in systems of different safety class) should be documented. 

Loss of filter box ventilation shuts off solvent feed... 

Critical switchgear ventilation equipment failure leading to loss of emergency buses... 

A workshop has a fabric and ventilation sensible heat loss of 30 kW, and the process requires that the room be maintained at 22 °C dry bulb. Determine the supply air volume required at 34 "C in order to maintain the space at design conditions. 

The metal itself, having an appreciable vapour pressure, is also toxic, and produces headaches, tremors, inflammation of the bladder and loss of memory. The best documented case is that of Alfred Stock (p. 151) whose constant use of mercury in the vacuum lines employed in his studies of boron and silicon hydrides, caused him to suffer for many years. The cause was eventually recognized and it is largely due to Stock s publication in 1926 of details of his experiences that the need for care and adequate ventilation is now fully appreciated. 

This is too hot an installation for V-belt drives. However, they may be used if ventilation is good and perhaps an insulated hot wall is interposed between the sheaves and fan housing. Allowance must be made for belt losses from manufacturers tables and also any other mechanical losses of the driver. If a motor is used, the shaft output should be 5 hp to cover losses and allow for nonoverload. The 0.2 overload at peak conditions does not justify a 7.5 hp motor because expected operations will be at 3.0, and a 5 hp motor can usually be overloaded 10% without difficulty. 

Overheating can be due to a number of causes, but is usually from solar gain and machinery heat losses. If ventilating to provide thermal comfort in a space for humans or animals there are a number of considerations apart from simply air temperature ... 

While the air distribution must match the heat distribution, the position of extracts is not important. Direct return to air-handling units mounted around the room in numbers necessary for reliability is common practice. In the event of loss of one or more cooling modules a well-designed ventilated ceiling adds to reliability by distributing the reduced amount of air in the same proportions throughout the room. 

Metabolic acidosis is characterized by a decrease in serum HC03. The anion gap is used to narrow the differential diagnosis, as this acidosis may be caused by addition of acids (increased anion gap) or loss of HC03 (normal anion gap). The compensation for metabolic acidosis is an increase in ventilation with a decrease in arterial C02. 

Metabolic alkalosis is characterized by an increase in serum HC03A This disorder requires loss of fluid that is low in HC03 from the body or addition of HC03 to the body. The compensation for metabolic alkalosis is a decrease in ventilation with an increase in arterial C02. 

To determine the suitability of fluorinated HDPE containers as packaging material for the solvent-based formulations, the containers were placed in well-ventilated ovens at 50°C for 28 days. During this period the mass loss of the contents was monitored. To date more than 130 liquid crop protection chemical formulations have been evaluated at the AEC by this method with at least 91 of them having serious permeation problems through the untreated HDPE containers. In only two cases fluorinated containers did not have acceptable barrier properties. 

Control of NH3 loss arising from winter-housed stock presents similarly difficult problems. Increased frequency of scraping and reduced ventilation are expected to restrict such loss. The use of chopped straw or other carbonaceous bedding may also reduce loss by increasing immobilisation of NH4+ as it forms. Losses of NH3 from slurry stores will be minimized when the surface area to volume ratio is low. Covering the store may also assist in reducing loss. 

Drying is an excellent way of preserving herbs many leaves and seeds keep their flavor well and, stored correctly, should last up to a year. Providing the ideal range of temperatures and ventilation for drying individual herbs is not easy in a domestic situation, and if you dry herbs at home you may find that the drying process results in some loss of flavor and color. Some herbs do not retain their flavor well when dried, and are best used fresh, or frozen. Check all the plant material carefully before you dry it and discard any parts that are diseased or damaged. 

There are two main methods of drying herbs either suspended in bunches, or lying flat on racks or trays. For the enthusiast, electric dryers are available. It is best to dry each type separately, as they tend to dry at different rates. Choose a dark, clean, dry, well-ventilated spot, free from dust and insects. Always dry herbs out of direct sunlight, which causes loss of color and flavor. 

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