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Reg. 210, Reg. 211, Reg. 212
TUBE PLATES


Parts to be stayed

a) The stiffness of tube plates and pitch of stays within the nests of tubes where stay tubes are required and where marginal stay tubes are required in support of blank spaces adjacent to or between the nests shall be determined by flat plate rules under Regulation 195.
b) Tubes plates within the nests of tubes whether fitted with stay tubes or not shall comply with the requirements of Regulation 211 in regard to thickness and cross section between tubes.


Reg. 211
TUBE PLATES


Minimum thickness and cross-section

To provide a secure attachment for plain tubes in the tube plates the thickness and cross-section of the plate between the tube holes shall be not less than :-

Steel tube plate

.125D + .2 = minimum thickness in inches Eqn.(47)

.17 + .025 = minimum cross section in square inches Eqn.(48)

Copper tube plate,

.2D + .4 = minimum thickness in inches Eqn.(49)

.527D - .263 = minimum cross section in square inches Eqn.(50)

D is the diameter in inches of the tube at the part of attachment to tube plate.

Where the thickness and cross-section of the tube plates are less than the minimum the appropriate co-efficient in Eqn.(51) shall be reduced in proportion to the deficit.


Reg. 212
TUBE PLATES


Holding power of plain tubes

a) Where tube plates are not specially stayed in nests of tubes the working pressure, based on the holding power of the tubes shall not exceed that found by the following formula ; -

 

W.P. = C x D Eqn.(51)
A

Where
D = the diameter of tube at the part of attachment to tube plate in inches,

A = the area in square inches of the tube plate supported by each tube which generally may be taken as the product of the horizontal and vertical pitches of the tube less the area of the tube itself.

C = 470 for tubes expanded into parallel holes in steel or iron tube plates,

C = 530 for tubes expanded into taper holes in steel or iron tube plates.

For copper tube plates or copper or brass tubes the appropriate co-efficient should be deducted 20 percent.

b) In the unstayed tube plates of locotype boilers and in other tube plate in which stay tubes are not required the support afforded by the plain tube shall not be taken to extend beyond the lines enclosing the outer edges of the tubes. Parts of flat plate outside this line shall either lie in the plate margin or be separately supported. No account need be taken of the stiffness of tube plate in the nests of tubes when the above conditions are fulfilled.

Ordinarily the requirements of this clause are applicable only to expanded smoke and water tubes in flat continuous tube plates containing more than one row of tubes

(See Reg. 152 for attachment of tubes in Water Tubes Boilers).
 
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