If you have test data from the outlet of the control device, you can use it to estimate emissions rather than using the model. If you have a limited amount of data, but have conducted inlet and outlet testing, you can calculate the efficiency of the control device and apply it to emissions estimated by the model.

Landing losses occur from floating-roof tanks whenever the tank is drained to a level where its roof rests on its deck legs (or other supports). Vapors that occupy the space below the roof are emitted upon refilling the tank (filling losses). Emissions also occur while the roof rests on the supports (standing idle losses). Total landing loss emissions are therefore the sum of the daily standing idle losses and the filling losses over the entire period that the roof remained landed.

You should select the Horizontal Tank option and from the Physical Characteristics screen and answer "Yes" to the question, "Is the tank underground?" Since the surrounding earth limits the diurnal temperature change, the model assumes that there are no breathing losses from the tank (breathing losses from atmospheric pressure fluctuations are assumed to be negligible). Only working losses will be calculated.

All tank-flashing emission calculations must be supported with an analysis using the Vasquez-Beggs equations. When these equations are not appropriate for an operating situation, you must supplement the Vasquez-Beggs analysis with results from another estimating method that you believe is more appropriate, or the AQB may request that you do so.

No! The beauty of Regency Direct Vent technology is that you do not necessarily need to go up through your roof to terminate the venting. All you need is proximity to an outside wall, the distance to which depends on the model you choose. Not only does this make installation more flexible, but it also keeps the costs down. And with our sleek and attractive patented AstroCap horizontal termination cap, you won't be cluttering up the outside of your home either.

If a tank is heated, the vapor space can be assumed to be at a constant temperature and no breathing losses will occur. The tank must be heated to a uniform temperature and well insulated, thus isolating it from heat gains and losses due to insolation and variations in ambient temperature. Changes in atmospheric pressure are assumed to have only negligible contributions to breathing losses and are not considered.

An emissions estimate is expressed as a mass released per time (ug/minute for the entire source). A flux measurement is expressed as a mass per time and area source (ug/m2,min-1). Emission are estimated by multiplying the surface area (m2) of the area source by the representative flux (ug/m2,min-1) for the area source emission (ug/minute).

Following surgery, the patient is given the Medtronic Access Review unit, a hand-held battery-operated unit that can be used to determine if the device is on or off, to turn it on or off, and to check battery life. The device does not at this time allow the patient to control the intensity of stimulation. This is done in the physician's office. In the future, the newer pulse generator (the Medtronic Kinetra) will allow some patient control over the stimulation level.

Whether the tank is of fixed roof or internal floating roof design, no modifications to the equations are required. The gas blanket will not affect emissions if the tank is operated near atmospheric pressure. Low pressure conditions are defined by API as an operating range of just above atmospheric to 15 psig. The TANKS model uses equations developed under atmospheric conditions and is not programmed to estimate emissions from low pressure tanks.

Indoor studies are performed in one of two ways. A first estimate is made by collecting outdoor surface flux data along the structure foundation and applying an infiltration factor to the outdoor flux data. A more detailed assessment involves measuring flux on points of infiltration indoors and calculating an indoor flux. Indoor air concentration (or exposure) is estimated by using the indoor flux and a box model representing the structure ventilation.

Yes. If this means putting a couple of 45° bends in to get it around the eave, do so. If the vent terminates under an eave, the air from the vent will downdraft over the property possibly causing a urine smell to occur. Ideally the vent should be installed to 2-3 feet above the peak of the roof to prevent downdraft.

There were numerous styles used over the years – all of which are no longer available. The openings measured a standard 14 x 14”, all of which were made by Hehr. The late 1940’s “frying pan” version was replaced in the 1950's with the 2 part baking dish and integral seal, and then again in 1965/1966 with rounded corner slightly domed “Solardome”, a metal framework with plastic panels.

Emissions standards also vary from state to state, and even regions within states. Most states will require that your car meet the specifications for the year of your engine. Another reason to stick with an early engine. It is usually possible to title the car as a pre-emissions vehicle as described in our REGISTRATION faq above.

Try changing the distance between the remote control the HP-100 or the HP-100 and the device you want to control. Also try removing the plastic IR cover when recording and/or sending. IR is programmed to use 40KHz as the carrier frequency. There are some devices that use another frequency and therefore can not be controlled by IR.

Yes. The TightWatt2 can control your primary and auxiliary/booster pump. In most cases, the TightWatt2 can replace two mechanical timers. Yes. The battery back-up will keep the time and date accurate even when the power is shut off by your load control transponder.

We can't provide you with an estimate online. However, Butler Builders? and Roof Dealers are independent contractors authorized by Butler Manufacturing Company to distribute our products and services. They specialize in utilizing Butler? roof systems in reroof and new construction applications. These systems include reroofing over existing metal and nonmetal roofs, slope-enhancing framing systems, and architectural standing-seam roofs.

For a fixed roof tank, calculate emissions from one turnover with the turnover factor (Kn) = 1 to account for vapors displaced during filling and then add the emissions from 1 turnover calculated as if the tank had a floating roof to account for clingage. For a floating roof tank, calculate emissions for one turnover then add the emissions from the tank assuming it has a fixed roof with a height equal to the height of the legs (about 6 or 7 ft.

The model is programmed to handle cone and dome roofs which are the most common geometries. Other geometries must use one of these options to calculate the "Roof Outage" (the additional tank shell height in feet that would produce a volume of space equivalent to the space under the roof alone). The Roof Outage is one component of the Vapor Space Outage used in the breathing loss calculation. You must calculate the Roof Outage external to the program based on the geometry of the roof.