MATERIALS - 15861N0019

g.

Minimum hopper side slope angle degrees from horizontal, [60]

[_____].

h.

Minimum casing design pressure at [260 degrees C] [500 degrees F]

[_____], Pa inches water gage [+3735+15] [_____].

i.

Minimum casing design vacuum at [21 degrees C] [70 degrees C]

[_____], Pa inches water gage [-6225-25] [_____].

j.

Minimum casing design temperature, degrees C F [_____].

PART 2

PRODUCTS

2.1

MATERIALS

**************************************************************************

NOTE: Select the applicable paragraph(s) from the

following:

**************************************************************************

NOTE: Use these paragraphs for multitube collectors

150 mm 6 inch diameter collecting tubes may cause a

plugging problem. Designer must investigate flue

gas particulate size, distribution and tendency of

particulates to adhere to each other for the

specific project before selecting diameter of

collector tubes.

**************************************************************************

Multitube collector parts exposed to flue gas shall have a multilayer

internal lining having physical characteristics suitable for the service

and able to withstand abrasive and chemical action of flue gas and fly ash.

Insulating properties of lining shall be such that metal skin temperature

shall not exceed 343 degrees C 650 degrees F. All parts subject to

deterioration shall be accessible for inspection, maintenance or

replacement. Materials used shall conform to the following requirements:

**************************************************************************

NOTE: Use ASTM A 242/A 242M steel when material is

subjected to continuous temperatures of 204 degrees C

400 degrees F or higher.

**************************************************************************

a.

Exterior shell: [ASTM A 242/A 242M Type 1] [or] [ASTM A 36/A 36M]

6 mm 1/4 inch minimum thickness.

b.

Hoppers:

[ASTM A 240/A 240M] 6 mm 1/4 inch minimum thickness.

**************************************************************************

NOTE: Use ASTM A 242/A 242M steel when material is

subjected to continuous temperatures of 204 degrees C

400 degrees F or higher.

**************************************************************************

c.

Collecting and outlet tube sheets:

[ASTM A 242/A 242M Type 1]

[or] [ASTM A 36/A 36M].

d.

Outlet tube:

[ASTM A 139 Steel] [or] [ASTM A 667/A 667M

SECTION 15861N

Page 19