WW-H-191E
term "recovered materials" means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. Unless otherwise specified, none of the above shall be interpreted to mean that the use of used or rebuilt products are allowed under this specification.
3.5 Interchangeability. All units of the same classification furnished with similar options under a specified contract shall be identical to the extent necessary to ensure interchangeability of component parts, assemblies, accessories, and spare parts.
3.6 System of measurement. The dimensions used in this specification are not intended to preclude the use of the metric system of measurement in the fabrication and production of the material, individual parts, and finished product, provided form, fit, and function requirements are satisfied.
3.7 Design. Design pressure for both the shell and tube sides shall be not less than 125 pounds per square inch gage (psig) (862 kilopascal (kPa (gage)). Pressure loss of the water flowing through clean tube shall be not greater than 6 psig (41 kPa (gage)), and the water velocity shall be not greater than 7.5 feet per second (2.3 metre per second (m/s)). The acceptable nozzle steam velocity shall be not greater than 6,000 feet per minute (30.48 m/s). The rated heater capacity in gallons per minute (GPM) (litre per second (L/s)), temperature of inlet water and temperature of outlet water in degrees Fahrenheit ( F) (degrees Celsius ( C)), and the pressure of steam available at the shell nozzle (psig (kPa (gage)) shall be as specified (see 6.2).
3.8 Construction.
3.8.1 Shell. The shell shall be fabricated from carbon steel pipe conforming to ASTM A 53 grade B. The shell front end shall be a bolted flanged joint. The shell rear end for type I heater shall be welded integral with the shell cover. The shell rear end for type II heater shall be a bolted flanged joint. Unless otherwise specified (see 6.2), the nominal shell diameter and shell length (rounded off to the nearest inch (millimetre (mm)) shall conform to the manufacturer's standard dimensions. The shell length for type I heater is the dimension from the face of the front end flange to the tangent line of the rear end shell cover. The shell length for type II heater is the dimension from the face of the front and rear flanges.
3.8.2 Tubes. Tubes shall be seamless copper or copper alloy conforming to ASTM B 75, ASTM B 111, or ASTM B 395.
3.8.3 Tubesheet. Tubesheet material shall be comparable for tubes specified in 3.8.2 used in commercial practice and designed that the tube bundle be removable from the shell. Tubes shall
be rolled into a single tubesheet. When specified (see 6.2), tubes shall be seal welded or brazed to the tubesheet.
3.8.4 Heads. Heads shall be fabricated from carbon steel conforming to ASTM A 516, grade 70 or cast iron conforming to ASTM A 278, grade 30. The front head cover shall be a one-piece flanged bonnet. The rear head for type I heater shall be an integral bonnet cover. The rear head
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