404 Page Not Found Looks like the page you're trying to visit doesn't exist.Here's how to select and install resistance heaters for reliable operation of motors in damp locations.You can avoid condensation problems in motors by maintaining a winding temperature 5 [degrees] C to 10 [degrees] C above the surrounding air temperature.For 3-phase AC motors operating in damp conditions, the best way to prevent condensation is to install resistance heaters inside the motor.The installation of flexible resistance heating strips or coils is by far the simplest and least expensive method.For example, a heater and its installation in a typical 60-hp, 364T-frame motor will cost approximately $210.These strip space heaters typically are installed inside the stator housing near the bottom of the motor or in the air chamber above the motor's feet.They should be at least 1/2 in.All motor manufacturers publish a recommended heater wattage for each frame size that varies with manufacturer for any given frame.

The differences are small enough to allow reference to a standardized table, such as shown here.Also, you can calculate the approximate wattage required by using the equation W=2DL, where "W" is the heat in watts, "D" is the outside diameter of the stator laminations in inches, and "L" is the length of the stator core in inches.If you don't have sufficient clearance for rigid strip heaters, flexible heaters can be laced to the outside diameter of the end turns of varnished windings.They should not overlap or be double layered.Larger motors often require a heater in each end.Heater leads are brought out through the motor terminal box and connected to the available single-phase voltage.A heater typically is activated by means of a motor control circuit relay contact, which energizes the heater when power to the motor is disconnected.Timers sometimes are used.Trickle heating can be tricky Another method is the application of a controlled low voltage to the windings.Although this application of AC or DC power to "trickle heat" the windings may be a viable alternative in a pinch, it's not practical as a permanent solution.

Trickle heating with single-phase 115V or 230V AC power will draw excessively high currents, thus requiring a large wire size, greater energy consumption, and potential degradation of the motor's insulation.For example, a 60-hp, 364T-frame, 1770-rpm motor tested on single-phase AC power draws 64A at 120V, 60A at 115V, 50A at 100V, and 15A at 40V.vaporizer jakarta kalimalangThe amount of heat that would be generated by a sustained draw of even 50A quickly begins to degrade the winding's insulation.vicks vaporizer v188 reviewFurthermore, this author is not aware of any generally accepted method to calculate the amperage that will produce the desired stabilized temperature, nor any technique to calculate the voltage that will produce that amperage.fuzion vaporizer dvr 500

Therefore, a variable power source is required, and a time-intensive trial-and-error process must be carried out to find each and every motor's individually correct voltage, amperage, and resulting rise in temperature.As a permanent installation, the use of a contactor between the low-voltage power source and motor is required, in addition to the relay at the motor control source.usa vaporizer svr 230You'll encounter the same difficulties when trickle heating with a DC power source (which would need to be individually variable at each motor or group of identical motors).d3 globe vaporizer reviewAlso with DC, the amperage drawn goes up more quickly per volt than with AC.tea vaporizer temperatureWhere DC trickle heating can come in handy is as a last-resort, quick-fix to dry out occasional winding dampness.personal vaporizer pekanbaru

For example (again using a 60-hp motor), if insulation resistance readings suggest winding moisture, the motor can be connected to a readily available temporary DC supply, such as a welder, whose rheostat can be adjusted until the ammeter shows an initial pull of 5A to 10A.jual garskin vaporizerWhat amperage to start at is a judgment call or an educated guess.vaporizer pekalongan(The above is a hypothetical example, not a recommendation.)Adjusting the amperage up or down from your starting point and determining how long to apply the current are also risky hit-or-miss guesses, even with temperature probes.Nonetheless, after a certain period of time at a certain amperage, test insulation resistance again, and then repeat the process until either acceptable readings are obtained.Hydro Instruments manufactures the world's highest quality gas chlorinators, gas chlorination systems and chemical metering equipment.

Hydro gas chlorinators & residual chlorine analyzers have become globally recognized as the most ruggedly designed, highest quality and longest lasting available.If you have been using another brand of gas chlorinator, spend a few minutes finding out why Hydro is the fastest growing gas chlorination equipment manufacturer in the market.Our product line includes: chlorine gas feeders, residual chlorine analyzers and chlorination equipment, ejectors, dechlorination systems, calibration columns and corporation stops for chemical injection.Download the Hydro Instruments product line overview here.Hydro Instruments also manufactures corporation stops in a variety of sizes and materials.All Hydro Instruments                 ISO 9001 products are made in the USA.Patient Care By Mar 11, 2015 This CE activity is approved by EMS World Magazine, an organization accredited by the Continuing Education Coordinating Board for Emergency Medical Services (CECBEMS) for 1 CEU.

To take the CE test that accompanies this article, go to to take the test and immediately receive your CE credit.Heart failure (HF) is a common medical problem in the United States.It’s experienced by approximately 5.1 million persons, with more than 650,000 new cases diagnosed annually.1–3 The incidence of HF increases with age,2 and for Americans over 40 the lifetime risk of developing HF is 20%.4 It occurs most frequently among black men and least frequently in white women.5 HF is the primary diagnosis in more than a million annual U.S.hospital admissions.1 Patients admitted for HF are at risk for rehospitalization, with a one-month all-cause readmission rate of about 24% and a six-month rate greater than 50%.6–8 There were 60,341 deaths from heart failure in U.S.in 2012, the last year for which data is available.9 Considering that in 2012 cardiovascular disease (the leading cause of death in the U.S.that year) killed 782,985 persons, we can determine that 7.7% of all cardiovascular deaths in 2012 were from HF.9 While survival rates for persons with HF have improved, the absolute mortality rates for HF are approximately 50% within five years of diagnosis.3,10 This month’s EMS World CE article uses three case scenarios to explore the evaluation and prehospital treatment of the patient with HF.

These cases explore the clinical context of all the elements of the history and clinical exam to form a “big picture” understanding of the event, and also discuss the appropriate management of the patient with chronic and acute HF in the prehospital setting.Heart failure is the inability of the heart to produce adequate cardiac output to meet the perfusion and oxygenation requirements of the body’s tissues.It is a complex clinical syndrome that can arise from any structural or functional cardiac disorder that impairs the ability of the ventricle to fill with or eject blood, resulting in decreased cardiac output.5 There are two mechanisms by which HF can occur: In systolic heart failure (SHF), the heart has impaired contractile function, resulting in a decreased stroke volume (SV) and cardiac output (CO) and subsequent low blood pressure.Patients with SHF also have a decreased ejection fraction (EF).The EF is the percentage of blood pumped out of the ventricle with each heartbeat.

A healthy adult would be expected to have an ejection fraction between 50%–75%.A patient with an EF less than or equal to 40% is said to have HF.5 A number of factors can lead to impaired myocardial contractile function.Acute myocardial infarction (AMI) can acutely lead to impaired contractility, as infarcted myocardium is significantly weaker than healthy myocardium.After an AMI the scarred, remodeled ventricular myocardium will have less contractile force than healthy myocardium.Dilated cardiomyopathy can result from many etiologies, including chronic hypertension.Chronically increased blood pressure stretches and dilates the ventricular tissue, making it weaker.Valvular disease and ineffective heart valves can allow the retrograde movement of blood during systole, resulting in decreased SV.In addition, faulty heart valves (such as the aortic and pulmonary semilunar valves) can impede the forward movement of blood, resulting in decreased SV as well as increased intraventricular pressures, which can cause further problems such as cardiomyopathies.11