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Reg. 141
GIRDER STAYS

 

Breathing Space

a) Gusset stays shall be so arranged as to allow sufficient breathing space around furnace connections and tube nests.
b) For Lancashire boilers the proportions shown in the table below are recommended for the portion of the end plates above the furnaces and flues.

Thickness of End Plates L-
(Fig.8)
L-
(Fig.9)
Inches Inches Inches
½ 9 10
9/16 10 10
5/8 11 12
11/16
¾
13/16
12 13
Above 13/16 12½ 13½
c) Fig. 8 shows the breathing space recommended for the following conditions: Flat end, furnace or flues flanged for attachment to end plate, furnaces and flues formed with Adamson flanged seams.
d) Fig. 9 shows similar conditions to Fig. 8 except that the end plate is flanged outwards for the furnace or flue ring connection, the breathing spaces allowed being 1 inch more than those for the same thickness of plate in Fig.8.
e) Where a corrugated section not less than 6 feet long is included in each internal flue of a Lancashire boiler, the dimensions given in the table above may be reduced by approximately 1½ inches throughout.
f) It is recommended that the breathing space below the furnaces and flues shall be approximately one half the dimensions given in the table above. Whereas it is desired to use any other arrangement which gives a greater or less degree of flexibility, the amount of breathing space shall be specially considered and modified as the necessity of the case requires.
g) For gusset stays above tube nests, as fitted in waste heat boilers without internal furnaces, a breathing space of 8 inches from the centre line of the top tubes to the centre of the toe rivets of the gusset angles is recommended (see Fig. 9).
 
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