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Steam Stationary Engines, Traction Engines, Steam Boats

Water Tube Boiler Design

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Old 03-01-2011, 12:10:09 PM
bauereri bauereri is offline
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Default Water Tube Boiler Design

Hello All,

Does anyone know if there are sites out there that provide design details for small water tube boilers? I'm new to the steam community, but I know better than to design one of these myself for safety reasons. My ultimate project goal is to build a steam engine system that is about 10hp to generate electricity. I've visited many sites that talk about them in general terms, but nothing specific on design and build.

Thanks in advance for your thoughts.

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Old 03-01-2011, 01:14:40 PM
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Allan Crook Allan Crook is offline
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Default Re: Water Tube Boiler Design

Hi Eric

Try here

Cheers Al
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Old 03-01-2011, 01:27:01 PM
Oberon67 Oberon67 is offline
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Default Re: Water Tube Boiler Design

Have you seen this thread?

Does anyone make a modern steam genset?
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Old 03-01-2011, 04:58:54 PM
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Gary K Gary K is offline
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Default Re: Water Tube Boiler Design

I don't know if this will be of any help, but its good reading?

DOBLE. The generator is of the water-tube type, with the tubes arranged in rows, which are really separate sections, Fig. 40.

There are 28 of these sections in the generator part of the boiler. The tubes are made from seamless drawn-steel tubing of about 1/2" diameter and are swaged down to a diameter of about 3/8" at the ends. These ends are welded into the top and bottom headers, thus making each section a continuous piece of steel.

Besides the 28 sections of tubes in the generator portion, there are 8 more sections in the economizer or feed-water heater. The arrangement of all these sections is clearly shown in Fig. 41, the view being cut across each of the 36 sections, similar to Fig. 40. The picture does not show all the details but has been arranged to give an idea of the general layout and the direction of flow of the hot gases and of the water and steam. The boiler sections are completely covered over, except at the bottom, by a 3/4" wall of heat-resisting and insulating Kieselguhr material. Over this is a planished iron jacket.

All of these sections are connected together by headers, which run along the sides of the boiler. One of the features of the construction is that if anything should go wrong with a section of tubes, it can be very easily cut out of operation by means of the side headers, until such time as it is convenient to replace the section.

In Fig. 41, the direction of flow of the hot gases of combustion is shown by the heavy arrows, while the flow of the water and steam is indicated by the small arrows. From the combustion chamber at the bottom of the boiler, the gases pass upward and then over the top of the firewall between the generator proper and the economizer. Here they turn and pass downward in order to escape through the exhaust at the bottom. It should be noted that the power-driven feed pump forces the water in an upward direction in the economizer tubes, exactly opposite to that of the gas flow outside of the tubes.

From the top headers of the economizer sections, the water overflows through a manifold to the lower headers of the generator sections. An automatic valve controls the feedwater, so that the water in the boiler, under normal conditions, stands about half-way to the top. On the road, the usual pressure is around 600 lbs., which is maintained by an automatic valve controlling the fuel supply. Each section of the boiler is tested to a water pressure of 5000 lbs. The actual bursting pressure is said to be over 8000 lbs. As a precaution against any danger, however, a safety valve is attached to the boiler.
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