Part 5 (1/2)

The drums for all pressures are of two sheets of sufficient thickness to give the required factor of safety The longitudinal sea bent to the proper radius in an hydraulic press The circulating tubes are expanded into the dru as tube seats

The dru are the saitudinal types The sections and mud drum are also the same for the two types

Cross drum boilers are supported at the rear on the mud drum which rests on cast-iron foundation plates They are suspended at the front fro suspended independently from the cross members by hook suspension bolts This method of support is such as to allow for expansion and contraction without straining either the boiler or the brickwork and permits of repair or renewal of the latter without in any way disturbing the boiler or its connections

The following features of design and of attachments supplied are the same for all types

FRONTS--Orna frae doors for access to the front headers and panels above the fire fronts The fire fronts where furnished have independent frames for fire doors which are bolted on, and ashpit doors fitted with blast catches The lugs on door frames and on doors are cast solid The faces of doors and of fras milled The doors and frames are placed in their final relative position, clae pins drilled while thus held A perfect alignment of door and frame is thus assured and the method is representative of the care taken in small details of ed that any stoker ht modification wherever boilers are set with sufficient furnace height

[Illustration: Cross Drue wrought-iron doors, which give access to the rear headers, are attached to the rear supporting fraitudinal Drum Babcock & Wilcox Boiler, Equipped with Babcock & Wilcox Superheater]

[Illustration: Automatic Drumhead Stop and Check Valve]

FITTINGS--Each boiler is provided with the following fittings as part of the standard equipment:

Blow-off connections and valves attached to the mud drum

Safety valves placed on nozzles on the steam drums

A water colue attached to the boiler front

Feed water connection and valves A flanged stop and check valve of heavy pattern is attached directly to each dru automatically in case of a rupture in the feed line

All valves and fittings are substantially built and are of designs which by their successful service for many years have become standard with The Babcock & Wilcox Co

The fixtures that are supplied with the boilers consist of:

Dead plates and supports, the plates arranged for a fire brick lining

A full set of grate bars and bearers, the latter fitted with expansion sockets for side walls

Flas, and special fire brick for lining sae ith expansion sockets for side walls

A full set of access and cleaning doors through which all portions of the pressure partsda

There are also supplied with each boiler a wrench for handhole nuts, a water-driven turbine tube cleaner, a set of fire tools and apipe equipped with a special nozzle for blowing dust and soot fron and construction as covered in the foregoing description, a study of the illustrations will make clear the features of the boiler as a whole which have led to its success

Thethe boiler has been described This allows it to be hung at any height that may be necessary to properly handle the fuel to be burned or to accoht of the nest of tubes which for feature in deterht, or the distance from the front headers to the floor line The sides and front of the furnace are formed by the side and front boiler walls The rear wall of the furnace consists of a bridge wall built from the bottom of the ashpit to the lower row of tubes The location of this wall ive the depth of furnace dee wall is the deterreat depth of furnace is necessary, in which case, if the front baffle were placed at the bridge wall the front pass of the boiler would be relatively too long, a patented construction is used which maintains the baffle in what may be considered its normal position, and a connection e wall by means of a tile roof Such furnace construction is known as a ”Webster” furnace