Titanium Flange For Chemical Pipeline Project

Product Overview

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

Titanium Flange for Chemical Pipeline Project | ASTM B381 Gr2/Gr7/Gr12, ASME B16.5, MTC 3.1

Meta Description: Titanium Flanges for chemical pipeline projects — ASTM B381 Gr2/Gr7/Gr12/Gr5, ASME B16.5 WN/SO/Blind/RTJ, grade matched to medium + temperature, UT+PT+PMI, EN 10204 3.1, project NDE dossier. Lot-confirmed dispatch, FOB Shanghai.

Chemical Pipeline — Grade Picked by Medium, Not by Habit

Rule: corrosion isocorrosion chart by acid + concentration + temperature decides, not "titanium resists everything". HF, dry chlorine, red fuming nitric = excluded.

Flange Type by Duty

• WN (weld neck) — vessel nozzles, high-P/T, cyclic, toxic/flammable service
• SO (slip-on) — low-P general chemical runs, cost-efficient
• Blind — line isolation, test cover, spare nozzle
• SW / Threaded — small-bore instrument taps, no-weld zones (anti-galling threads, Ra controlled)
• RTJ — high-pressure hydrocarbon/acid loops; ring gasket metal, never titanium-on-titanium contact face
• LJ + stub end — frequent clean-out lines (pharma/food)

Project Supply Scope

• ASTM B381 (SB-381) F-2/F-5/F-7/F-12; ASME B16.5 (1/2–24"), B16.47 Ser A/B large bore
• EN 1092-1 / DIN / JIS B2220 drill on request (PCD confirmed before machine)
• Class 150–600 rotating; 900+ PO-forged
• RF/FF/RTJ/T&G; face Ra controlled for gasket seat
• Closed-die forge → anneal → CNC → pickle → ferroxyl check → face protect

QC / NDE Dossier (project-ready)

1. EN 10204 3.1: measured O/H/N/C/Fe + tensile, heat-to-ingot, QA-signed
2. UT on forging body (volumetric) + PT on machined face
3. PMI/XRF grade verify (Gr7 Pd by chemistry, not label)
4. RT on declared welds per ITP (nozzle attach / shop weld / repair), Ti/Al IQI
5. Dimensional: OD / PCD / bore / hub taper / RF height per B16.5
6. Heat No. etched pre+post machine — parent = finished
7. 3.2 (SGS/BV/TÜV/DNV) PO-fronted, TPI witnesses NDE

Installation Notes We Put in Every Project Pack

• Galvanic: titanium is noble — insulate from CS/SS/Cu with PTFE/phenolic sleeve + washer kit; never graphite direct in oxidizing chloride
• Gasket: expanded PTFE (general) / spiral-wound with Ti inner ring (high-T/P) / soft-iron or Inconel RTJ ring (never titanium ring)
• Bolting: torque from bolt proof load, not steel table; star pattern 30%-70%-100%; re-torque PTFE joints after 24h
• Welding: GTAW, 100% argon both sides, ERTi-2/Gr-grade filler, silver/straw pass, blue/purple reject; WPS/PQR = installer scope
• Iron contamination: dedicated tooling, ferroxyl test if suspected

RFQ Template (project buyers copy this)

Medium + concentration: ___
Design T: ___°C   Design P: ___bar   Code: ASME VIII / GB150 / PED ___
Grade confirm: Gr2(F-2/R50400) / Gr7(Pd) / Gr12 / Gr5 ___
Type: WN / SO / Blind / RTJ / SW / TH ___
NPS×SCH: ___   Class: 150/300/600/___
Standard drill: B16.5 / EN1092 PN__ / JIS ___
NDE: UT+PT default / RT %___ / 3.1 / 3.2(TPI ___)
Gasket+bolt material: ___
Qty + delivery week: ___
Incoterm: EXW Baoji / FOB Shanghai / DAP ___

FAQ — Chemical Pipeline Titanium Flange

Q1: Is Gr2 always enough for chemical lines?
A: For oxidizing chloride/seawater/weak acid — yes, most cost-effective. Reducing acid (HCl/H₂SO₄ hot) → Gr7; hot crevice → Gr12.

Q2: WN or SO for a reactor nozzle?
A: WN — full-penetration, stress flow, radiograph-friendly. SO only for low-P utility runs.

Q3: Can titanium bolt directly to carbon steel flange?
A: Not without insulation kit. Galvanic attack eats the steel, not the titanium. Use insulating sleeves/washers.

Q4: RTJ ring material?
A: Soft iron / 316L / Inconel. Titanium ring galls under bolt load — never used.

Q5: RT on flange body?
A: UT+PT on forging; RT only on declared welds per ITP. We don't fake "full-disc RT".

Q6: Gr7 proof?
A: Pd by MTC chemistry + PMI. Label alone never proves Gr7.

Q7: 3.2 for project audit?
A: TPI named at PO; witnesses forge+NDE. Cannot be back-built from 3.1.

Q8: Hydro test on flange only?
A: No — hydro is spool/vessel scope. Flange ships with NDE + 3.1; hydro at assembly.

Q9: HF / dry chlorine?
A: Titanium excluded. Red line stated upfront, no workaround offered.

Q10: HS code?
A: WCO 6-digit 8108.90 base; destination sub-heading via broker.

Request a Quote

Email: sales@[yourdomain].com

Send medium + T/P + grade + type + qty. Reply in 24h: grade recommendation, heat status, EXW/FOB price, NDE scope, dispatch window.

About: Baoji Titanium Valley chemical-pipeline flange line — ASTM B381 Gr2/Gr7/Gr12/Gr5, ASME B16.5, closed-die forged + in-house CNC, UT+PT+PMI, EN 10204 3.1, project NDE dossier (RT on welds per ITP). Grade matched to medium, not to habit. No cast substitute, no Pd-by-label, no graphite-on-titanium gasket advice, no cert downgrade. Lot confirmed before PI; tag = MTC = PL = weld map.