Patent GB-190525475-A (GB)
Title: Improvements in and relating to Marine Type Water Tube Boilers.
Inventor: JAMES PRENTICE SNEDDON
Filed: 1905-12-07
Abstract: 25,475. Sneddon, J. P. Feb. 25, [date applied for under Patents Act, 1901]. Void. [Published under Patents Act, 1901.] Marine water-tube boilers ; headers ; joints and jointing; tubes, water ; settings &c.-C o n s i s t s broadly in a watertube boiler having a water-jacketed lining connected with the water circulation, details in the boiler being also improved. The front headers 2, Figs. 1 and 2, communicate with the inclined watertubes 3 arranged as in the usual Niclausse type of boiler, the tubes being close - ended at their rear and resting in a rack 4. The intermediate front headers are preferably of serpentine form, while the corner front t headers 5 are reversely curved on their inner sides a and formed with flat or plain faces on their outer sides. They may, however, be the same as the intermediate headers. The front and rear ends of the furnace chamber are formed of water linings or boxes 6, 7, which may be constructed of pressed sheets. As shown, the rear sheet 8 of the rear box is flanged outwardly at its bottom and ends and preferably extended above the front sheet with an outward extension 9<1>. The front sheet 9 is flanged rearwardly and secured by bolts 10. The front face of the rear box and the rear face of the front box are embossed so as to receive the reduced ends of the squared or elliptical side water-tubes 12 which, extending to the level of the grate, form the side water casing of the fuel chamber. The front box is flanged similarly to the rear boxes, and rests upon frames 21, 22. The firing-holes are cut through the front box and closed by lining-rings 23. Balanced doors are provided. Hand-holes. 27 are provided in the front and rear. The connexion of the front headers with the front bar may be arranged in any suitable manner, as by U-shaped tubes 29. The intermediate headers are shown as resting upon adiustable double wedges 28. The corner front headers may be connected directly to the water box as shown in Figs. 10 and 11. The ring 31 is welded in the reduced circular end of the header and the portions of the ring between the bolt-holes cut away. Bolts 32 secure the header to the water box. A packing of copper corrugated gasket may be employed, The connexions between the side furnace tubes and the front and rear boxes may be of any desirable form. In Fig. 7, the end of the tube 12 enters a flange on the sheet 40 and is secured by bolts 36 which pass through the ring 37 and the ring 35 which is welded into the mouth of the tube to prevent steam from pocketing, portions of the ring between the bolts are removed. As shown in Fig. 9, the double cone 39 is interposed between the flange 40 and the-end of the tube. In a modification, the upper ends of the front and rear boxes are inclined in the same direction as the tubes, and the lining-ring of the fire-hole is extended downwardly to form the sides of the ash-pit door opening. The front and rear headers are connected to the water boxes by nipples. Baffles are also provided about the tubes in the gas chamber. Around the nipples which secure the front headers to the water box, #-shaped spacing-rings may be placed to assist in supporting the headers. Where the boiler is of considerable width, the front water-box may be made in two parts divided at the centre line of the boiler, and the front headers at the centre line may extend between the front water boxes or water jackets to assist in supporting the drum and intermediate parts, or the boxes may abut at their adjacent ends, the headers resting upon them. In such a case, a central row of tubes may divide the furnace. The corner headers may also extend down to the grate level in any of the forms, the side tubes then being secured to the corner water-legs formed by these extensions.