PTFE Lined Steam Header RFQ Checklist for EPC and Procurement Engineers
A request for quotation that says only PTFE lined steam header and distribution manifold leaves too many engineering questions unanswered. Suppliers may quote completely different constructions, making commercial comparison difficult and potentially unsafe. An effective RFQ should define the flow circuits, real operating conditions, acceptance requirements, and documentation expected from the manufacturer.
Start by clarifying the equipment description
Ask whether steam flows through the lined bore, through a separate heating jacket, or through an unlined distribution header alongside lined chemical-service lines. This single distinction determines which material system is exposed to steam.
For a conventional steam-only header, a metallic construction may be more appropriate. PTFE-lined construction should be proposed for direct steam contact only when the manufacturer can document suitability for the exact pressure-temperature-cycle envelope.
Supply complete process data
State the medium and chemical composition, design and operating pressures, minimum and maximum temperatures, total mass flow, and individual branch loads. Include normal, peak, and minimum operating cases. Identify condensate quality, steam dryness where relevant, and the expected number of startups.
For jacketed systems, provide separate process-core and jacket data. Do not rely on a single temperature line for two different pressure circuits.
Define the mechanical configuration
Include a simple piping and instrumentation diagram, inlet and outlet sizes, number of branches, branch orientation, valve arrangements, flange drilling, face-to-face dimensions, available installation space, and support points. Identify all drains, vents, instruments, and connections required for pressure protection.
If a header will distribute steam, require a condensate drainage philosophy and review top-mounted branch takeoffs. Specify how trapped condensate will be removed at startup and low load.
Ask for material and lining details
The manufacturer should list shell material, pipe schedule or design thickness, welding requirements, liner material and manufacturing method, nominal liner thickness, lined-face construction, and venting arrangement. If chemical resistance justifies PTFE, provide the actual wetted medium and seek compatibility confirmation.
Request the complete assembly's pressure-temperature rating, including liner, flanges, branch pieces, and seals. A metal shell rating alone is not the rating of the lined package.
State codes and inspection requirements
Identify the governing piping code, such as ASME B31.1 for applicable power piping or ASME B31.3 for relevant process piping. ASTM F1545 may be relevant for factory-made plastic-lined ferrous piping. Its qualification tests do not establish universal steam suitability.
Define material certificates, weld records, dimensional inspections, liner integrity checks, hydraulic testing, and functional checks as required by the project. Avoid inventing a mandatory test pressure without confirming design conditions and the applicable code.
Request meaningful vendor deliverables
Require a general arrangement drawing, data sheet, bill of materials, pressure-temperature limitations, installation instructions, operating restrictions, and applicable test reports. For lined equipment, request guidance on thermal cycling, vacuum limits, flange bolt torque, and vent access after insulation.
Commercially, compare scope boundaries, spare parts, documentation, inspection costs, delivery terms, and exclusions. An apparently lower price may omit drains, supports, insulation interfaces, or critical qualification evidence.
Frequently overlooked questions
What happens during sudden cooldown? Can steam condense in dead legs? Are vents safely routed and visible? How is the assembly drained before maintenance? Is the liner qualification representative of the branch geometry?
Use a structured technical bid evaluation
Prepare a compliance matrix with each operating condition, design requirement, and requested document on a separate row. Ask suppliers to mark compliance, deviation, or clarification. Review temperature limits, liner suitability, drain arrangements, and shutdown behavior before awarding technical approval. This process helps procurement teams identify whether the quotations actually represent comparable products, not merely similar names and flange sizes.
Conclusion
The strongest RFQ describes the duty, not merely the product name. Clear operating data help manufacturers recommend a credible steam header, a qualified lined manifold, or a steam-jacketed process assembly. Better questions before ordering reduce costly changes and protect the people who operate the system.
