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Reg. 524, Reg. 525
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMISER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

REGULATIONS FOR REGISTRATION AND INSPECTION OF ECONOMISERS AND FEED PIPES

Preparation for inspection
 

a)

At each inspection the economiser shall be emptied and thoroughly cleaned internally and externally and in the flues. All mountings shall be opened up and all caps, doors and blank flanges removed to permit adequate inspection.
b) The owner of an economiser to which this Regulation is applicable shall obtain the approval of the Chief Inspector in writing to the method of disconnection which he proposes to use and shall be responsible for ensuring that the method so approved is followed in practice.
 


Reg. 525

STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMISER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

REGULATIONS FOR REGISTRATION AND INSPECTION OF ECONOMISERS AND FEED PIPES

Procedure for Registration
a) On receipt of an application for registration the Inspector shall, after the economiser has been prepared for examination, take full particulars of the design and ascertain the working pressure allowed by the Regulations.
b)

The fitness of the economiser parts shall be determined as per the following formulae:-

(i)

Cast Iron Smooth Tube Economisers with Pressed Socket Joints.

WP = AZ + 225N Eqn.(124)
70a n

Where,

WP=Design pressure in pounds per square inch (gauge).
A= Area of contact surface of a single socket, square inches.
a= Cross sectional area measured on the mean diameter of a socket hole, in square inches.
Z=Breakdown load of an unreinforced socket joint in pounds.
N=Number of stays per header.
n=Number of sockets per header.

For existing standard designs the breakdown load of an unreinforced socket joint shall be taken as not greater than 13,500 lbs. For designs not already in use before the date of this standard the corresponding figure shall be taken as not greater than 75 per cent of the load as determined by experiment.
(ii) Headers of approximately rectangular cross section.

WP = C(t-2) Eqn.(125)
Where,

t = Thickness in thirty-second of an inch.
b = Distance between the sides of header supporting the surface, in inches.
WP= Design pressure, in pounds per square inch (gauge)
C = 11 where the water side surface is flat

= 22 where the water side surface is curved, provided that the curvature is continued without interruption and the thickness at each end of the side is not less than that determined with C=11.

In no case, however, shall the thickness of the side of a header be less than 16 thirty-seconds of an inch at any part.
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