Heat Exchanger

S.S. Heat Exchanger / Condenser Tubes to ASTMA - 249

Introduction and Scope This standard covers the manufacture and supply of welded austenitic stainless steel, boiler, super heater, heat exchanger and condenser tubes.

Materials Material, is ordered to comply with the requirements of ASTMA - 240 in grades 304, 304L, 316 and 316L in general other grades such as 310, 321, 304H, 316H are manufactured against specific requirements.

Size Range

OD: 9.52 mm to 101.60 mm
Thickness: 0.6 mm to 3.0 mm
Length: 14 mtrs. Maximum

Process Of Manufacture The tube is manufactured from colod rolled, annealed SS coil on continuous forming tube mills using TIG welding process under inert atmosphere. Subsequent to welding on mill, the weld metal is cold worked by bead rolling. All tubes ae then annealed to a minimum temperature of 104 degree Celsius, straightened, end finished, picked and passivated, tested and marked. Tubes are also drawn on draw benches wheenever Customer demands heavy cold working or closer & smooth ID.

Tolerances

OD Size Range	Over MM	Under MM
Under 25.4	0.10	0.10
25.4 to 38.1 Incl.	0.15	0.15
38.1 to 50.8	0.20	0.20
50.8 to 63.5	0.25	0.25
63.5 to 76.2	0.30	0.30
76.2 to 101.6	0.38	0.38

Test

Normal: Tensile , Reverse Bend , Hardness, Flattening, Flange, Hydrostatic Pressure
Optional: Pneumatic / Air leakage, Eddy Current , IG Corrosion

Marking All pipes are marked as folows: Bhandari, ASTM A-249, Garde, OD, Thickness, Length, Heat No.

Sl no.	Outside Dia		Wall Thickness (in mm)
	Inch	MM	0.5	0.6	0.7	0.8	0.9	1	1.2	1.5	1.6	2	2.5
1	3/8"	09.52	0.113	0.134	0.155	0.175
2		10	0.119	0.141	0.163	0.184
	1/2"	10.00	0.153	0.182	0.21	0.238	0.266	0.293	0.345
4	5/8"	12.70	0.192	0.229	0.265	0.302	0.337	0.372	0.441	0.54

Due to variations between different specifications comparisons made exactly, physical, chemical and mechanical values are also typical and should not be taken as being accurate.