Complete Packed-Tower Internals Packages: How Should the RFQ Define Package Boundaries?
A complete packed-tower package may include:
packing, distributors, support grids, collectors, bed limiters, demisters, gas distributors, and attachment hardware.
The phrase:
complete tower internals
sounds convenient.
It is also one of the easiest phrases to misunderstand commercially.
The RFQ should define where the package begins and ends.
Create an Internal-by-Internal Scope
Instead of relying on one package name, the procurement document should identify each internal by:
equipment tag, elevation, quantity, material, and scope.
This creates a common reference for all suppliers.
Packing Scope
State:
packing type, material, bed height, quantity, and number of beds.
If structured packing is included, layer and segmentation information may also be required.
Distributor Scope
Clarify whether the package includes:
main distributor, redistributors, feed pipes, supports, and fastening hardware.
Mechanical Supports
Define whether the supplier provides:
support grids, beams, bed limiters, clips, bolts, and vessel-side attachments.
A supplier cannot safely assume which items are already welded to the tower.
Demister Scope
State whether the demister includes:
mesh or vane unit only, support, hold-down, frame, and installation hardware.
Nozzle Connections
Identify which internal pipes or collectors terminate at vessel nozzles and which party is responsible for the connection.
Vessel-Side Components
The tower fabricator may provide:
support rings, clips, nozzle necks, and welded brackets.
These responsibilities should be separated from removable internals.
Drawings
A complete package normally requires:
overall internal arrangement and individual fabrication drawings.
This helps identify clashes between components before production.
Commercial Breakdown
Even when the buyer wants one package price, individual component pricing can be useful for:
technical changes and future spare purchases.
Procurement can request both:
total package price and itemized component values.
Engineering Takeaway
“Complete tower internals” should never be the only scope definition.
The procurement package should identify every internal, interface, vessel-side responsibility, removable component, hardware item, and documentation requirement.