Estimating for Heating and Ventilating, 3rd Edition

44 SPECIFICATION AND DRAWINGS

Boiler pressure Magnesia Hard setting asbestos

bar

lb/in

2

mm in

mm

in

up to 3*45 up to 50 45

1*

19

i

3-52 to 6-90 51 to 100 60

2i

19

i

6-96 to 10-34 101 to 150 70

2*

19

i

Note: lb/in

2

χ6895x 10"

2

=bar

In the case of horizontal boilers of the Lancashire, Cornish

or Economic type, the front end plate is not to be covered.

The covering on all boilers must be finished with canvas and

painted as before specified.

When steel or iron flue connections are specified to be covered,

special high temperature non-conducting materials 65 mm

(2^

in) thick must be used, reinforced with wire netting and

painted two coat