Design Rules for Titanium Piping Systems
Titanium
Design Rules for Titanium Piping Systems
Nickel
Stainless
Carbon
Alloy
Copper, Brass and Bronze
Design Rules for Titanium Piping Systems
Practical Engineering Rules for Reliable Corrosion-Resistant Piping
Titanium piping systems are typically selected to eliminate corrosion-related failures in seawater, brine, and aggressive chemical service.
However, titanium piping reliability depends on system design discipline—especially in flow management, crevice avoidance, galvanic isolation, fabrication control, and commissioning.
The following rules summarize field-proven practices for designing and operating titanium piping systems.
Rule 1. Define the True Service Conditions Before Selecting Grade
Titanium grade selection must be driven by the worst credible operating condition—not the average.
Confirm:
Medium: seawater / brine / process chemical / mixed streams
Temperature range (including start-up and upset)
Flow regime: continuous / intermittent / stagnant
Solids/fouling risk and cleaning method
“Standby” periods and preservation plan
Apply the Selection Guide only after service conditions are fully defined.
Rule 2. Treat Low-Flow and Stagnation as Primary Design Risks
Titanium relies on a stable passive film; oxygen replenishment and flow help sustain it.
Design to avoid:
Dead legs
Oversized lines operating at very low velocity
Long standby with liquid-filled piping
Low-point pockets that trap stagnant liquid
Stagnation management is corrosion management.
Rule 3. Eliminate Dead Legs and “Hidden Crevices”
Crevice conditions often occur at:
Socket-like geometries and sharp recesses
Threaded interfaces and tight gaps
Gasketed joints with poor compression
Deposits behind supports or clamps
Engineering actions:
Use full-bore branch design where possible
Minimize pockets and non-draining sections
Prefer designs that can be flushed and drained
Rule 4. Design for Drainability and Venting
A titanium line that cannot be drained or vented is a future maintenance problem.
Include:
High-point vents for air removal
Low-point drains for complete draining
Sloped lines in services prone to deposits
Access points for flushing and chemical cleaning
Drain/vent design is especially critical in seawater, brine, and intermittent duty.
Rule 5. Control Galvanic Coupling with Dissimilar Metals
Titanium is electrochemically noble; when coupled to less noble metals in conductive fluids, the other metal may corrode rapidly, compromising joints and interfaces.
Control measures:
Electrical isolation (insulating gaskets, sleeves, washers)
Avoid mixed-metal bolting where feasible
Use compatible flange strategies and isolation kits
Manage grounding and bonding intentionally
Galvanic control is a system responsibility, not a titanium “feature.”
Rule 6. Use Flange, Gasket, and Fastener Systems as an Engineered Set
Avoid treating sealing as a commodity detail.
Consider:
Gasket compatibility with the fluid and temperature
Compression control and bolt preload strategy
Creep/relaxation behavior under thermal cycling
Avoidance of crevice-prone gasket geometries
Practical principle:
Most leaks are joint-system problems, not pipe problems.
Rule 7. Prefer Welding Over Threads for Critical Service
Threaded joints introduce:
Crevices
Stress raisers
Sealant variability
Potential for galling and assembly damage
For corrosion-critical lines:
Prefer butt welds where possible
Use qualified procedures for titanium welding
If threaded connections are unavoidable, treat them as high-risk points and manage with inspection and service limits
Rule 8. Titanium Welding Must Be “Procedure-Driven”
Titanium is highly reactive when hot. Poor shielding and contamination can reduce corrosion performance.
Mandatory controls:
Cleanliness (oil, dust, iron contamination)
Full inert gas shielding during welding and cooling
Qualified WPS/PQR and trained welders
Proper purge for ID shielding (where applicable)
Engineering rule:
A great grade with poor welding behaves like a bad material.
Rule 9. Support Design Must Consider Thermal Expansion and Vibration
Titanium piping may experience significant thermal movement depending on temperature swing and layout.
Design considerations:
Allow for expansion loops or flexible sections
Avoid over-constraining supports
Prevent vibration in high-velocity or pump discharge sections
Use non-contaminating clamp materials and avoid crevice traps at supports
Rule 10. Maintain Internal Cleanliness and Prevent Cross-Contamination
Titanium is sensitive to contamination during fabrication and installation.
Controls:
Dedicated handling procedures
Avoid carbon steel tooling contact (iron pickup risk)
Cap ends to prevent dirt ingress
Clean and dry lines before commissioning
Contamination control is part of quality assurance, not housekeeping.
Rule 11. Commissioning, Preservation, and Standby Plans Must Be Defined
Many failures occur during:
Commissioning
Extended standby
Low-load operation
Include in design and procedures:
Flushing and cleaning protocol
Hydrotest medium quality control (as required by project)
Dry-out / preservation method for standby
Drain-and-vent strategy for long outages
Rule 12. Grade Escalation Does Not Replace Good Design
Common misconceptions:
“Use Grade 7 everywhere to be safe.”
“Higher grade fixes dead legs.”
Reality:
Grade escalation increases cost
Does not remove crevice geometry or stagnation
May hide the root cause in design review
Use grade escalation rationally:
Practical Review Checklist (Quick Use)
Before releasing a titanium piping design, verify:
No dead legs without mitigation
Drain/vent points included where needed
Galvanic isolation strategy documented
Flange/gasket/bolt system specified coherently
Welding procedures qualified and purge plan defined
Support/expansion analysis completed
Commissioning and standby preservation plan defined
How This Page Fits into the Titanium Knowledge System
This page supports and links to:
Products → Titanium Pipes (product form and standards)
Titanium Grade Selection Guide (grade decision logic)
Why Titanium Still Fails (failure mechanism context)
Standards & Quality (inspection and certification requirements)
It represents the rule-based execution layer for titanium piping reliability.