Purchasers must specify the following when ordering:

• Quantity (total length or number of tubes)
• Material (seamless carbon steel boiler tube)
• Dimensions (nominal outside diameter and minimum wall thickness, in inches [A192] or millimeters [A192M])
• Length (cut lengths with tolerances or random lengths)
• ASTM Designation (A192 for inch-pound units, A192M for metric)
• Testing Requirements (hydro-static test, nondestructive electric test, or expanded flattening test)
• Certification (if mill test reports are required)
• Additional Requirements (special marking, heat treatment, or supplementary testing)

• Steel making Process: Open hearth, electric furnace, or basic oxygen process.
• Manufacturing Method: Tubes are hot-finished or cold-drawn, then stress relieved or annealed to ensure ductility and strength.
• Heat Treatment: Mandatory to meet mechanical property requirements.

Mandatory Tests:

• Hydro-static Test: Each tube must withstand a specified water pressure (≥ 70 bar / 1,000 psi for 5 sec) without leakage.
• Nondestructive Electric Test (NDE): If hydro-static testing is waived, eddy current or ultrasonic testing must be performed.

Optional/Special Tests:

• Flattening Test: A sample must flatten to a specified distance without cracking.
• Flaring Test: A cone expansion test to verify ductility (if required).
• Hardness Test: Optional, per agreement.

• Outside Diameter: Permissible variations (±0.8% for cold-drawn, ±1.0% for hot-finished).
• Wall Thickness: Must meet minimum requirements with tolerances (±10% for most sizes).
• Length (Cut): ±3.2 mm (1/8 in.) for lengths ≤ 7.3 m (24 ft).
• Length (Random): 4.9–12.2 m (16–40 ft).