Maxims and Instructions for the Boiler Room / Useful to Engineers, Firemen & Mechanics; Relating to Steam Generators, Pumps, Appliances, Steam Heating, Practical Plumbing, etc.

by N. Hawkins

RIVETED OR SCREW STAYS.

Fig. 49.

In addition to palm and gusset stays, there are in use riveted or screwed stays, as shown in [Fig. 49].

This would not answer in furnaces, owing to the burning off of the heads, hence driven stays are used there.

Fig. 50.

These screwed stays, shown in [Fig. 50], are used (in marine and similar boilers) between the combustion chamber back and boiler back and also between the sides of the combustion chambers.

The general plan is to have a large nut and washer inside and outside the boiler with the outside washer considerably larger than the inside, so as to hold more efficiently the back and front ends together.

In marine boilers it is customary to place the stays 15 to 18 inches apart for ease of access to the parts of the boiler, and to make them of 2¹⁄₄ to 2¹⁄₂ inch iron of the best quality.