Monel Alloy 400 Tubing Pressure Ratings

Monel Alloy 400 Tubing Pressure Ratings
Maximum Allowable Working Pressure (PSIG)

Calculation Basis: Annealed, seamless Monel Alloy 400 tubing ASTM B-165 or equivalent. System temperatures between -20°F and 100°F with allowable stress of 18,700 psi. Ultimate tensile strength of 70,000 psi. Table values are per the ANSI / ASME B 31.3 Code for temperatures from -325°F to only 100°F. Monel derates fast at elevated temperatures.

(For more specific working pressure information regarding a particular tubing, consult with the our manufacturer suppliers of the tubing.). Suggested Tube Ordering Information: Specify the outside diameter and wall thickness of annealed, seamless Monel Alloy 400 tube of ASTM B-165 or equivalent specification. Also specify high quality tubing to be free of scratches, and suited for bending with material hardness not to exceed Rb 75.

Factors Affecting Pressure Ratings

Temperature Derating: As temperature increases, the allowable stress decreases. For service at 600°F, multiply the room-temperature pressure by 0.79.

Welded vs. Seamless: ASME SB 163 (Seamless) typically carries a higher pressure rating than welded equivalents due to the lack of a longitudinal weld seam (Weld Joint Factor E=1.0).

Corrosion Allowance: Always factor in a "corrosion wall thickness" if the medium is aggressively acidic, as thinning walls will lower the pressure capacity over time.

Alloy 400 Tubing Pressure Ratings

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