Double-Pipe & Hairpin Exchangers NDT Guide
Authoritative engineering reference for concentric tube-in-tube and multi-hairpin heat exchangers. Inspect high-pressure differential U-bends, longitudinal finned inner tubes, and return bend girth welds.
Ideal for extreme temperature crossovers and high operating pressures where shell-and-tube thermal expansion would cause severe tubesheet stress.
How B2B Project Workflow Works
From initial RFP scope to direct client sign-off. NDT EXCHANGE does not charge commissions or manage project payments.
RFP Scope
Asset Owner posts turnkey B2B inspection scope with technical specifications, asset list, and required NDT methods.
Competitive Bids
Certified NDT agencies submit competitive proposals (Fixed-Bid / T&M) detailing technician rosters and day rates.
Direct Settlement / Escrow
Client awards bid and sets up direct milestone payment or escrow — NDT EXCHANGE never holds or manages project funds.
Field Execution
Level II/III inspectors perform on-site testing (PAUT, TOFD, MFL, UT), capturing flaw data and calibration overlays.
Sign-Off & Payout
Level III auditor reviews findings; upon client sign-off, funds release directly to agency with 0% platform commission.