Air Preheater Corp. v. Commissioner

36 T.C. 982, 1961 U.S. Tax Ct. LEXIS 80
CourtUnited States Tax Court
DecidedSeptember 13, 1961
DocketDocket No. 51624
StatusPublished
Cited by6 cases

This text of 36 T.C. 982 (Air Preheater Corp. v. Commissioner) is published on Counsel Stack Legal Research, covering United States Tax Court primary law. Counsel Stack provides free access to over 12 million legal documents including statutes, case law, regulations, and constitutions.

Bluebook
Air Preheater Corp. v. Commissioner, 36 T.C. 982, 1961 U.S. Tax Ct. LEXIS 80 (tax 1961).

Opinion

Tietjens, Judge:

The petitioner asks for a redetermination of the respondent’s denial of relief sought pursuant to section 722 of the Internal Revenue Code of 1939 from excessive and discriminatory excess profits taxes for the years 1940 to 1945, inclusive. Relief is claimed under the provisions of section 722 (b) (4) and also under section 711(b) (1) (J) and (K).

The petitioner’s excess profits tax returns for the taxable years were filed with the collector of internal revenue for the third district of New York.

FINDINGS OF FACT.

Some of the facts are stipulated and the stipulation of facts and exhibits thereto are incorporated by this reference.

The petitioner was incorporated in 1925 under the laws of New York as a wholly owned subsidiary of a Swedish company, Aktiebo-laget Ljungstrom Angturbin. At all material times petitioner’s principal office was in New York, New York, and its manufacturing plant in Wellsville, New York.

In 1933 the Superheater Company acquired the controlling interest in the petitioner and the Swedish company retained a minority interest. At the same time Superheater acquired control of Combustion Engineering, Inc., which was a manufacturer of boilers and of preheaters of the plate and tubular type. Superheater manufactured accessories for steam powerplants and boilers.

Petitioner is a manufacturer and seller of air preheaters for installation in public utility central generating stations, industrial power-plants, oil stills, and other plants.

The air preheater is a steam boiler accessory that adds heat to cold air to raise its temperature prior to combustion. The source of the heat is the waste gases from a boiler unit or furnace. The transfer of heat from the waste gases to the cold air is usually effected through the medium of metal surfaces. Preheated air gives better combustion in boiler furnaces, and increases boiler efficiency. At all times material hereto, every decrease of 35° F. to 40° F. in exit gas temperatures resulted in an approximate saving of 1 percent in fuel consumption.

The petitioner manufactured regenerative preheaters under a license granted in 1926 by its Swedish parent.

The Ljungstrom air preheater is a rotary type air preheater which permits continuous transfer of heat from waste gases to incoming air. It differs from the recuperative air preheater in scientific principle.

The recuperative air preheater is composed of tubes or plates which are exposed to waste gas on one side, and to cold air on the other. Heat must pass from the waste gas to the cold air through the plate or tube walls. The rate of flow depends upon the heat head, conductivity of the metal, conductivity of gas films on both sides of the metal, and upon the conductivity of any deposit that may have adhered to the metal.

The regenerative or rotary air preheater built by the petitioner does not require heat to pass through a film-deposit-metal-film barrier. Instead, heat from the waste gas is absorbed by a heating surface placed parallel to the direction of flow of gas and air which surface is then exposed to the incoming combustion air. The cold incoming air absorbs the heat from this surface.

Eegenerative preheaters are constructed for either vertical or horizontal flow of gases. In the vertical preheater with a center supported rotor, the weight of the rotor is supported by a thrust bearing above and guide bearings below. Prebeaters constructed for horizontal flow of gases have always been built with rotors supported by center shafts and driven by a pinion and gear rim drive.

In a vertical regenerative preheater the air currents pass vertically through a rotor which turns in a horizontal plane. The hot gases from the furnace pass through one side of the rotor and transfer heat to the metal in the rotor, this turns slowly and the incoming cold air passing through the other side of the rotor absorbs heat from the metal. The preheated air facilitates combustion in the furnace. In a horizontal air preheater the air currents pass horizontally through a rotor which turns in a vertical plane.

Prior to 1934, the rotor of the vertical regenerative air preheater was both rim supported and rim driven. The rim support consisted of carrying rollers supported on a track around the periphery of the rotor.

The size of a regenerative preheater depends upon the following factors: (1) The volume and temperature of exit gases from the boiler, (2) the volume and temperature of incoming air for combustion, (3) the desired exit gas temperature from the preheater, and (4) the allowable preheater draft loss. The larger the boiler, the higher the volume and temperature of exit gas and the volume of air needed for combustion. Consequently, as boilers increased in size, a need developed for preheaters with increasingly larger diameter rotors.

The preheater rotor contains individual elements which transfer heat from boiler exit gas to incoming air. During the base period, these elements were constructed of 24-gauge open hearth steel sheet metal. Some special purpose preheaters were constructed with stainless steel sheet metal elements.

The object of the preheater is to effect a transfer of heat from the waste gases to the incoming air to be used in fuel combustion. Increasing the amount of heat transferred tends to lower the exit temperature of the waste gas. The dew point of temperature is reached when a solid particle carried in the gas stream becomes wetted from condensation and will stick to a surface. As the temperature of the gas is lowered the dew point is approached. Waste gases enter the preheater at temperatures between 700° and 900° F. depending on the chemical constituents, such as sulphur, of the fuel. A deposit of solid particles adhering to the preheater elements will cause corrosion. The cold end of the preheater, that is, where the gases leave and the air enters, is more subject to corrosion than the other parts. By building preheaters with separate cold end sections, the problem of corrosion can be met by cleaning or replacing such sections easily or by making them of alloy steels having a higher degree of corrosion resistance.

A brochure published by the petitioner in 1982 contains the following statement:

A recent Ljungstrom development adopted to promote permanent cleanliness, sustained high efficiency and low-cost heating surface renewal where operating conditions invite excessive corrosion or deposit, consists in dividing each heating element into two sections, so that on assembling, two separate layers are formed in the rotor. * * * The layers are separated by a thin open grating.
Where fuel of high sulphur content is burned and the temperature in an air preheater of any malee and type drops below the dew point of the gases, the acid moisture precipitated on the heating surface tends to collect and bind floating solid particles of fly ash to the extent that such accumulations impede the draft, and the acid corrodes the metal, especially while the heater is out of service and cold.

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Related

Connecticut Light & Power Co. v. Commissioner
40 T.C. 597 (U.S. Tax Court, 1963)
Orangeburg Mfg. Co. v. Commissioner
37 T.C. 251 (U.S. Tax Court, 1961)
Air Preheater Corp. v. Commissioner
36 T.C. 982 (U.S. Tax Court, 1961)

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Bluebook (online)
36 T.C. 982, 1961 U.S. Tax Ct. LEXIS 80, Counsel Stack Legal Research, https://law.counselstack.com/opinion/air-preheater-corp-v-commissioner-tax-1961.