Low-Temperature Tube Bundle with ASME SA350 LF2 CL1 Tubesheet ASME SA334 Gr.6 U

Product Specification

Low-Temperature Tube Bundle ASME SA350 LF2 CL1 Tubesheet ASME SA334 Gr.6 U Bend Tube For Heat Exchanger

Product Overview
This is a complete U-tube bundle assembly engineered for reliable performance in low-temperature and high-pressure heat exchanger services, such as those found in gas processing, cryogenic, and high-pressure interchangers. The bundle combines a SA350 LF2 CL1 forged carbon steel tubesheet with excellent low-temperature toughness, and SA334 Gr.6 seamless steel tubes that are impact-tested for sub-zero service. This material specification ensures compliance with ASME BPVC Section VIII for pressure boundary components operating at low temperatures, providing a robust and code-compliant solution.

Key Features & Advantages

Engineered for Low-Temperature Integrity: Both core components are specifically rated for low-temperature service. The SA350 LF2 CL1 tubesheet is an impact-tested forging with guaranteed toughness at -46°C (-50°F), preventing brittle fracture. The SA334 Gr.6 tubes are seamless and normalized, also impact-tested to withstand low-temperature stresses during operation and upsets.

Optimal Design for Thermal Expansion: The U-bend tube design allows each tube to expand and contract independently, eliminating thermal stress issues associated with fixed-tube sheet designs. This is critical for applications with large temperature differences between the shell and tube sides.

High-Pressure Capability & Reliability: The forged LF2 CL1 tubesheet provides superior integrity under high pressure and mechanical load compared to cut-from-plate alternatives. Coupled with the seamless Gr.6 tubes, this bundle delivers dependable performance in demanding pressure cycles.

Material Traceability & Certification: The bundle is supplied with full Material Test Reports (MTRs). The tubesheet certification includes chemical analysis, mechanical properties, and Charpy Impact test results at specification temperature. Tube MTRs include impact test certification as per SA334 requirements.

Precision Manufacturing for Perfect Fit: Tubes are precisely bent to maintain uniform radius and minimize thinning. The tubesheet is accurately drilled and grooved to match the U-bend layout, ensuring leak-free rolling or welding of the tubes.

Typical Applications

Oil & Gas: Gas processing plants (amine gas coolers, gas dehydration chillers), LNG pre-coolers, high-pressure feed gas exchangers.

Petrochemical: Low-temperature process coolers, ethylene and propylene chillers.

Industrial: Cryogenic air separation units, high-pressure interchangers in chemical synthesis.

Technical Specifications (Summary)

Bundle Type: U-Tube (Removable).

Tubesheet Material: ASME SA350 LF2 Class 1 (Low-Temperature Carbon Steel Forging).

Tube Material: ASME SA334 Grade 6 (Seamless, Normalized Carbon Steel Tube for Low-Temperature Service).

Key Compliance: Manufactured in accordance with ASME BPVC Section VIII, Division 1, and TEMA standards.

Design Service Temperature: Suitable for services down to -46°C (-50°F) and lower, depending on specific design.

Certification: Certified MTRs for all materials, including impact test reports.

Why Choose This U-Tube Bundle?
We provide more than just components; we deliver a fully integrated, code-compliant assembly where material selection and mechanical design are optimized for your low-temperature and high-pressure duty. Our expertise ensures that the critical interface between the impact-resistant tubesheet and the tough U-bend tubes is executed flawlessly for long-term reliability.