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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 |
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a)
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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. |
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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.
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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