Part 5 (2/2)

[Illustration: Longitudinal Drum Boiler--Front View]

A consideration of this furnace will clearly indicate its adaptability, by reason of its flexibility, for any fuel and any design of stoker The boiler lends itself readily to installation with an extension or Dutch oven furnace if this be deeneral it ement may be made in connection with a Babcock & Wilcox boiler for burning any fuel, solid, liquid or gaseous

The gases of combustion evolved in the furnace above described are led over the heating surfaces by two baffles These are formed of cast-iron baffle plates lined with special fire brick and held in position by tube clah the forward portion of the tubes to a chamber beneath the drum or drums It is in this chamber that a superheater is installed where such an apparatus is desired The gases h the central portion of the tubes, called the second pass, by e wall of brick and the second baffle, around which they h the rear portion of the tubes and are led to the stack or flue through a damper box in the rear wall, or around the drums to a damper box placed overhead

The space beneath the tubes between the bridge wall and the rear boiler wall forases in their doard passage through the second pass will be deposited and froh doors furnished for the purpose

The gas passages are ample and are so proportioned that the resistance offered to the gases is only such as will assure the proper abstraction of heat fro excessive draft

[Illustration: Partial Vertical Section Showing Method of Introducing Feed Water]

The h the front drumhead of the boiler is clearly seen by reference to the illustration

From this point of introduction the water passes to the rear of the dru tubes to the sections, upward through the tubes of the sections to the front headers and through these headers and front circulating tubes again to the drum where such water as has not been formed into steae through the tubes is liberated as the water reaches the front of the drum The steam so formed is stored in the steah a so-called ”dry pipe” The dry pipe in the Babcock & Wilcox boiler is misnamed, as in reality it fulfills none of the functions ordinarily attributed to such a device This function is usually to restrict the flow of stea In the Babcock & Wilcox boiler its function is siate area of the holes in it is greatly in excess of the area of the steam outlet from the druh this collecting pipe It extends nearly the length of the druth of the steam space

[Illustration: Cast-iron Vertical Header Longitudinal Drum Babcock & Wilcox Boiler]

[Illustration: Closed Open

Patented Side Dusting Doors]

The large tube doors through which access is had to the front headers and the doors giving such access to the rear headers in boilers of the vertical header type have already been described and are shown clearly by the illustrations on pages 56 and 74 In boilers of the inclined header type, access to the rear headers is secured through the chae doors in the sides of the setting give full access to all parts for inspection and for re doors are supplied for the side walls through which all of the heating surfaceslance These side dusting doors are a patented feature and the shutters are self closing In wide boilers additional cleaning doors are supplied at the top of the setting to insure ease in reaching all portions of the heating surface

The drus

The removal of the handhole plates th and gives the assurance that no defect can exist that cannot be actually seen This is particularly advantageous when inspecting for the presence of scale

Theinto the construction of the Babcock & Wilcox boiler are the best obtainable for the special purpose for which they are used and are subjected to rigid inspection and tests

The boilers are manufactured by means of the most modern shop equipanization of skilled ineers

[Illustration: Cast-iron Vertical Header Cross Drum Babcock & Wilcox Boiler]

ADVANTAGES OF THE BABcock & WILcox BOILER

The advantages of the Babcock & Wilcox boiler may perhaps be most clearly set forth by a consideration, 1st, of water-tube boilers as a class as compared with shell and fire-tube boilers; and 2nd, of the Babcock & Wilcox boiler specifically as cons of water-tube boilers

WATER-TUBE _VERSUS_ FIRE-TUBE BOILERS