Titanium Tube Bundle Heat Exchanger ASME Certified

Product Overview

Reviewed and maintained by the Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd.

Titanium Tube Bundle Heat Exchanger ASME Certified | ASTM B338 Gr2/Gr7/Gr9/Gr12, U-Bundle, MTC 3.1

Meta Description: ASME-certified titanium tube bundle heat exchangers — ASTM B338 Gr2/Gr7/Gr9/Gr12 U-bundles and straight bundles. ASME BPVC Section VIII Div.1 + TEMA, hydraulic roll + orbital TIG welded tubesheet joints, 100% ET/hydro, PMI per heat, EN 10204 3.1, 3.2 TPI PO-fronted. Grade matched to duty, not to price.

"ASME Certified" Does Not Choose the Grade for You

ASME certification covers how the bundle is designed and built — calculation, welding, NDE, stamp. It does not decide whether your bundle should be Gr2, Gr7 or Gr12.

That decision belongs to the process stream:

• Oxidizing chloride / seawater / aerated brine → Gr2 (R50400)
• Hot crevice, boiling concentrated brine, reducing acid wash → Gr7 (R52400, Ti-0.2Pd)
• High-pressure / thin-wall U-bundle → Gr9 (R56320, Ti-3Al-2.5V)
• Hot brine needing extra strength → Gr12 (R53400, Ti-0.3Mo-0.8Ni)

A stamped bundle with the wrong grade is still a failure. We separate the code question from the metallurgy question — and answer both.

What "ASME Certified" Actually Covers on a Titanium Bundle

ASME is the manufacturing discipline. The alloy choice is a separate engineering decision that must be stated on the PO.

Grade Selection by Service (not by price)

Tube Bundle Specifications

U-Bend & Tube-to-Tubesheet — Where Bundles Live or Die

• U-bend radius: 1.5–2×OD (≤25mm), 2–2.5×OD (>25mm); mandrel bend, PT after bend
• Bend thinning: wall-thickness check at extrados; replacement if below min-wall calc
• Joint sequence: hydraulic roll to seat → orbital TIG seal weld → PT on weld cap
• Argon backing: ≥99.999% purity, measured dewpoint; no air-entrained welds
• Weld map: every joint numbered, WPS/PQR referenced, heat numbers cross-linked

QC & Traceability (every bundle, every heat)

1. ASTM B338 MTC EN 10204 3.1 — heat-specific chemistry + tensile + flatten/flare or reverse-flatten
2. Eddy-current or hydrostatic per B338 election (stated on PO)
3. PT on U-bends and tubesheet welds
4. PMI on tubes and tubesheet — grade verified, not assumed from tag
5. Heat No. = tube tag = MTC = weld map = bundle dossier
6. Hydro test per ASME VIII; passivation/cleaning validated
7. 3.2 (SGS/BV/TÜV/DNV) TPI PO-fronted for PED/offshore/mega-project

Replacement Bundle Service

• Reverse-engineer from old bundle or OEM drawing — tube count, pitch, pass, support-plate spacing
• Match existing grade or upgrade (e.g. Gr2 → Gr7) with written justification
• Supply bundle only or bundle + tubesheet + channel cover as required
• Spare tubes, support plates and tie-rods included on request

Hard Boundaries (no overclaim)

• ASME stamp does not excuse wrong grade selection — PO must name UNS + service chemistry
• No HF / fluoride service on titanium surfaces; separate alloy review required
• Gr2 not for hot deaerated reducing acid — Gr7/Gr12 only
• Dry chlorine excursion → separate review; titanium needs moisture to stay passive
• 3.2 cannot be issued after production; TPI named at PO

RFQ Template (copy-paste)

Service fluid (tube side): ___
Shell-side fluid: ___
Chemistry: Cl⁻ ___ppm, pH ___, fluoride ___ppm (NO HF confirmed ___)
Max tube-wall temp: ___°C   (upset excursion ___°C)
Duty: Q = ___kW, heating/cooling/evaporation
Tube: ASTM B338 Gr___, OD×wall ___, straight / U-bend qty ___
Pitch / layout: ___mm, triangular/square
Tubesheet: Gr___, thickness ___
Code: ASME VIII Div.1 + TEMA Class ___
Joint: roll / weld / roll+weld ___
NDE: ET / hydro / PT / PMI ___
Cert: 3.1 / 3.2 TPI (SGS/BV/TÜV ___)
Incoterm: EXW / FOB / CIF / DAP ___

FAQ — Titanium Tube Bundle ASME Certified

Q1: Does ASME certification mean the bundle is corrosion-proof?
A: No. ASME certifies the design and fabrication. Corrosion resistance comes from choosing the right grade for the actual stream. Both must be specified.

Q2: Gr2 or Gr7 for my brine service?
A: Aerated, oxidizing brine → Gr2. Boiling, concentrated, crevice-heavy or acid-wash segments → Gr7. We recommend per segment, not per price.

Q3: Seamless or welded tube?
A: Both are B338-valid. Welded + annealed is cost-effective for most bundles; seamless when the PO mandates it or for high-vibration duty.

Q4: Can you replace an existing bundle?
A: Yes — from drawing or sample bundle. We match or upgrade the grade with written justification.

Q5: What does 3.1 MTC actually contain?
A: Heat-specific chemistry, tensile results, test results per B338, QA-independent signature, and heat number cross-linked to every tube tag.

Q6: How is wall thinning at U-bends controlled?
A: Mandrel bending, PT on every bend, ultrasonic or pin-gauge wall check at extrados, replacement if below minimum calculated wall.

Q7: What about fluoride in the brine?
A: Titanium is excluded where HF or free fluoride contacts the surface. Alternative alloys or lined construction must be reviewed case by case.

Q8: Lead time for a replacement bundle?
A: Stock tubes can be bundled in days; custom wall, grade or U-bend geometry gets a firm production slot — never a fake "24h" promise.

Q9: HS code?
A: Bare tube bundle and complete exchanger follow different headings; Broker confirms by configuration and destination.

Q10: Biggest procurement mistake?
A: Writing "titanium tube bundle, ASME" on the PO with no UNS, no service chemistry and no temperature. That buys a certified bundle for the wrong stream — and ASME cannot be held responsible for that.

Request a Quote

Email: sales@[yourdomain].com

Send service fluid, chemistry, temperature, duty, tube spec and code level. We return a grade-per-pass recommendation with ASME documentation scope — not a one-grade quote.

About: Baoji titanium tube-bundle desk — ASME BPVC Section VIII Div.1 + TEMA shell-and-tube bundles in ASTM B338 Gr1/Gr2/Gr7/Gr9/Gr12. U-bend, straight, fixed and floating-head bundles; hydraulic roll + orbital TIG tubesheet joints; 100% ET/hydro; PMI per heat; EN 10204 3.1; 3.2 TPI PO-fronted. Grade chosen by process chemistry, not by catalog. Heat No. = tube tag = MTC = weld map.