h 82,040 Watts W and storage capacities up to 100 gallons gal 379 liters L and constructed to Underwriters Laboratories, Inc UL or American Society of Mechanical Engineers ASME requirements.

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A-A-50549

3.5.2.2 For heaters with oil having heat content of 140,000 Btu/gal (502,306 kJ/L). The minimum recovery efficiency for heaters with thermal input of 105,000 Btu/h (30,765 W) or less shall be 75 percent and for heaters with thermal input greater than 105,000 Btu/h (30,765 W) shall be 70 percent.

3.6 Tank. The water storage tank shall be of the vertical type and shall withstand the applicable working pressure and test pressures specified in table II. Tanks shall also withstand the proof test pressure specified in table II without damage or failure of the lining due to such defects as

crazing, cracking, or spalling. The tank shall be constructed in accordance with ASME Boiler and Pressure Vessel Code, Section IV, Pressure Vessels. Tank shall be furnished with a handhole for inspection and cleaning. Type I glass-lined (porcelain-enameled) tanks shall be equipped with magnesium anodes for cathodic protection.

TABLE II. Design pressures.

Standard pressures

Requirement (psig min) (kPa [gage] min) Working pressure 150 1,034

Proof test pressure 150 1,034

Hydrostatic test pressure 300 2,068

3.6.1 Tappings and fittings. Tappings and fittings for glass-lined tanks shall be furnished with insulating bushing with instructions on their use attached to the units. For stainless steel tanks, the tappings and fittings shall be manufacturer's standard commercial product for the service required. Tappings and fittings shall have tapered threads in accordance with ANSI B21.1. A separate tapping for a pressure relief valve shall be furnished in the tank.

3.6.2 Tank linings for Type I, glass-lined steel tank (porcelain enamel coating). The glass lining shall be applied to all interior surfaces that are exposed to hot water including handhole and handhole covers when applicable. The thickness of the glass lining shall be in accordance with industry practice.

3.6.3 Type II, stainless steel tank. Stainless steel shall be manufacturer's standard commercial product.

3.7 Oil burners. The oil burners shall be in accordance with UL296. The minimum firing rate for the burners shall be as specified in 2 when firing No. 1 or No. 2 oil per ASTM D396 without exceeding No. 1 smoke limit as indicated on the Shell-Bacharach Scale with Model RDC Smokemeter. Unless otherwise specified (see 7.2), the burners shall operate on 115 volts, single phase, 60 hertz. When specified (see 7.2), a motor starter shall be provided as a separate item with overload protection.

3.8 Controls. Unless otherwise specified (see 7.2), controls shall operate on 115 volts, single phase, 60 hertz.