FURNACES-HEAT TREATING, AND FORGING

TM 38-260

4-29. FURNACES-HEAT TREATING, AND FORGING

a. Removal of any large furnace from its installed position shall be considered only after determination by qualified

Government personnel that it can be reused elsewhere.

(1) Subassemblies, attachments, and accessories shall be removed to avoid damage or reduce cubage.

(2) Ceramic muffle boards and radiant tubes shall be removed and separately packaged and packed with

(3) Installation and operating instructions shall be placed in a greaseproof, waterproof envelope made from

barrier material conforming to MIL-B-121 grade A, class I. This envelope shall be marked, "Installation Operating

Instructions," and shall be securely attached to the furnace.

b. Remove and discard all firebrick and insulation in electrode type salt bath furnaces with ceramic pots.

c. Firebricking and refractory lining shall be removed entirely from any other type of furnace which has been in

uninterrupted service for 5 years or more, or if burned, cracked, or otherwise deteriorated sections are found.

d. A furnace which has been in service for less than 5 years, or has had interrupted service and been under

constant low heat while idle, shall be considered for transportation with its firebrick and refractory lining in place if it is

substantially free from any type of deterioration.

e. Lining shipped separately from the furnace will be packed in a domestic shipping container conforming to MIL-

STD-2073-1, table VII. Each piece of lining shall be separated from the other and from the inside face of the container

with cushioning material conforming to CID A-A-1898. Container specifications with regard to weight must be followed.

f. Blocking and bracing of brick and lining shall be in accordance with MIL-HDBK-701.

g. Records shall show whether firebricking or refractory lining has been removed.

h. Scale from exterior and interior surfaces may be removed by sandblasting or wire brushing. It is not necessary

to remove iron oxide (rust), except scale, by manual methods. These surfaces may be adequately prepared for the

application of preservatives by cleaning with cleaning process C-1 from paragraph 2-2. This includes the conveyor and

holding fixtures for projectiles on heat-treat furnaces. Scaly surfaces of conveyor chains that have been operating

through quenching oil need not be disturbed.

i. Disconnect supply lines from water cooled bearings and disassemble to the extent necessary to remove rust and

sludge. Disconnect piping serving other water-cooled components such as doors, door frames, and cooling chambers.

Drain the system and remove moisture from

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