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Reg. 509, Reg. 510, Reg. 511
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMISER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

CAST IRON, TUBES AND HEADERS

Standard test piece

The tensile test bar shall conform to the dimensions shown in the following drawing. Bars may be tested with either plain or screwed ends.

B D A P R C E F Lp Ls

In.
1.20

In.
0.798
Sq.in.
0.50
In.
2
In.
3-1/2
In.
2
In.
1-1/8
SF
1-1/8
SW
In
1-1/8
In.
8-1/4
In.
5-7/8

The test bars shall be cast as cylindrical bars of the diameters given in Col. B and machined to the dimensions given in Cols. D & P in the above Table.

See Figure



Reg. 510
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMIZER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

CONSTRUCTIONAL REQUIREMENTS

Cast Iron Economisers
 

The manufacturer shall, on the basis of design details, satisfy the Inspecting Authority regarding the design and the strength of all parts of cast iron economisers subject to the following maximum working pressure:-

  Max. W.P.
(1) Ordinary Vertical Tube 325 lbs. /sq. in.
(2) Ordinary Vertical Tube with strengthened tubes 375 lbs. /sq.in.
(3) Ring Stay Vertical Tube 475 lbs./sq. in.
(4) Gilled Tube type approved design 45.7 kg/cm² (650 lbs./sq.in.)
 

Reg. 511
STANDARD CONDITIONS FOR THE DESIGN AND CONSTGRUCTION OF ECONOMIZER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

CONSTRUCTIONAL REQUIREMENTS

Joint bolts and studs for Cast Iron Economisers
 
a) The maximum working pressure for the bolts and studs shall be calculated by Regulation 518.
b) The use of studs tapped into cast iron is permissible where:-

(i) The studs and nuts are not in the path of the flue gases.
(ii) The studs are carefully threaded to gauge and fitted into tapped holes of ample depth.

For economiser of Gilled Tube type of approved design made from 16.5 grade iron the limitation for a maximum working pressure may be increased to 52.7 kg/cm² (750 lbs./sq.in.)
 
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