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Reg. 551, Reg. 552, Reg. 553

Girder stays for Firebox and Combustion Chamber Crowns

 

Where girder stays are attached with stay bolts and nuts, they shall be bedded to the corners or ends of side plates.

The attachment of girder stays welded directly to the crown plates shall comply with Figures XII/47, XII/48, XII/49, XII/50 or XII/51. Such girders shall be welded to the crown plate prior to stress-relieving.

Each girder shall be of sufficient strength to support its due proportion of the load on the crown plate independently of the crown plate, and the bolts or weld attachments shall have sufficient cross-sectional area to carry the applied load.

The waterways between the underside of the girder and the crown plate shall be as large as practicable, but in no case less than 1 ½ inches deep.






Reg. 552


Gusset stays

Gusset stays shall be flat and perpendicular to the end plates. Gusset plates shall not be subjected to cranking or setting.




Reg. 553

Access

At least one manhole or sight hole shall be provided in the upper part of the boiler, the dimensions being not less than those in Table XII/2 for the given size of boiler:-

TABLE XII/2

Dimensions of Manholes or Sight Holes

Diameter of boiler Minimum size of hole inches
Boilers not exceeding 2 feet and 6 inches 9 x 7
Boiler over 2 feet and 6 inches diameter and not exceeding 3 feet 12 x 9
Boiler over 3 feet diameter and not exceeding 3 feet and 6 inches 14 x 10
Boiler over 3 feet and 6 inches diameter and not exceeding 4 feet 15 x 11
Boiler over 4 feet 16 x 12

Where the size of construction of the boiler does not permit of entry for cleaning or inspection of all internal surfaces, cleaning holes sufficiently large and numerous shall be provided for this purpose. The cleaning holes shall be not less than 3 ½ inches x 2 ½ inches in size.

One cleaning hole shall be provided opposite at least one end of each crosstube in a vertical crosstube boiler. Where the water tubes are arranged in banks, an opening of sufficient size to permit of their replacement shall to be provided.

At the bottom of the narrow water space in vertical boilers where internal access is not possible, mud holes shall be arranged at equal distances round the circumference of the boiler not less in number than as given in Table XII/3.

TABLE XII/3

Number of Lower Cleaning Holes of Mud Holes

Diameter of boiler No. of holes
2 Feet and over but not exceeding 3 feet 3
Over 3 feet and not exceeding 5 feet 4
Over 5 feet and not exceeding 6 feet 5
Over 6 feet and not exceeding 7 feet and 6 inches 6
Over 7 feet and 6 inches and not exceeding 8 feet and 6 inches 7
Over 8 feet and 6 inches and not exceeding 9 feet 8

Cleaning holes or mud holes in loco-type boilers shall be provided at each bottom corner or as nearly as possible in the corners of the outer firebox casing and at the top corners above firehole opening and also at each corner of the saddle plate in line with the bottom of barrel. Smoke box tube plate shall be provided with a mud hole.

A manhole shall be provided in the lower part of front end plates of Lancashire boilers and in similar boilers with internal flues wherever practicable.


 
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