Monthly Archives for May 2019

HVAC Vortex Shedding

Product research in controlling casing noise has developed a new method of reducing radiated noise. The technique is known as vortex shedding. When applied to terminal boxes, casing radiated noise is dramatically lowered. Casing radiation attenuation (CRA) vortex shedders can … Continue reading

30. May 2019 by admin
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HVAC Fire and Smoke Dampers

Ventilating, air-conditioning, and heating ducts provide a path for fire and smoke, which can travel throughout a building. The ordinary types of dampers that are often installed in these ducts depend on gravity-close action or spring-and-level mechanisms. When their releases … Continue reading

27. May 2019 by admin
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Straight Tube Boilers

The STRAIGHT-TUBE class of water-tube boilers includes three types: 1. Sectional-header cross drum 2. Box-header cross drum 3. Box-header longitudinal drum In the SECTIONAL-HEADER CROSS DRUM boiler with vertical headers, the headers are steel boxes into which the tubes are … Continue reading

17. May 2019 by admin
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Horizontal Return Tubular Boiler

A STATIONARY BOILER can be defined as one having a permanent foundation and not easily moved or relocated. A popular type of stationary fire-tube boiler is the HORIZONTAL RETURN TUBULAR (HRT) boiler shown in figure 1-4. The initial cost of … Continue reading

16. May 2019 by admin
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Scotch Marine Boiler

Figure 1-1 is a portable Scotch marine tire-tube boiler. The portable unit can be moved easily and requires only a minimal amount of foundation work. As a complete self-contained unit. its design includes automatic controls. a steel boiler. and burner … Continue reading

15. May 2019 by admin
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FLAME RECTIFICATION CIRCUIT FLAME-PROVING SIGNAL MEASUREMENT PROCEDURE

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15. May 2019 by matt
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THERMOCOUPLE VOLTAGE MEASUREMENT PROCEDURE

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15. May 2019 by matt
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Flame Rectification Sensor

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14. May 2019 by matt
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Thermocouple

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14. May 2019 by matt
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MOTOR OPEN, SHORTED, OR GROUNDED CIRCUIT MEASUREMENT PROCEDURE

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14. May 2019 by matt
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