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Reg. 512
, Reg. 513, Reg. 514
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMIZER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

Constructional Requirements

Economiser water outlet temperature

The design conditions shall be such that the maximum outlet water temperature of the economiser shall be at least 40°F below the saturated steam temperature in the boiler drum:

Provided that this requirement shall not apply to economisers used on low pressure water heating systems working at pressure less than 120 ft. head of water.



Reg. 513
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMIZER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

STEEL ECONOMISER WITH OR WITHOUT CAST IRON SLEEVES ON THE TUBES

Tubes: Construction
 

a)

The tubes shall be manufactured in accordance with Regulation 151.
b) Suitable provision shall be made for supporting horizontal tubes at one or more intervals in their length to relieve bending stresses and these supports as well as the end connections must permit free expansion.
 


Reg. 514
STANDARD CONDITIONS FOR THE DESIGN AND CONSTRUCTION OF ECONOMIZER, FEED PIPES, FEED HEATERS AND OTHER SIMILAR VESSELS

STEEL ECONOMISER WITH OR WITHOUT CAST IRON SLEEVES ON THE TUBES

Tubes: Working Pressure
 
The working pressure of the tubes shall be calculated in accordance with Regulation 338(a), but the working metal temperature shall be taken as the maximum water temperature for which the part of the element is designed plus 11°C (20°F).
 
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