Compare the same material package first
For an engineering, procurement and construction (EPC) buyer, the first question is how to place the material orders. A whole package has one commercial supplier; a split package places separate orders by product family; a hybrid groups some items and buys the rest separately. None of these labels tells you how many factories are involved.
Use the same baseline for every offer. Otherwise an apparently attractive package may simply leave out work included by another bidder. Keep buyer-supplied equipment, project design and site installation outside the material comparison unless they are expressly part of the requested supply.
- One bill of materials (BOM): item references, quantities and units for pipe, fittings, valves and support steel. Identify the buyer-supplied pump separately.
- One preparation basis: required end work, fabrication and supplied finish, tied to the applicable specifications and drawing revisions.
- One document and inspection schedule: required product records, item-to-record references and purchase-release conditions.
- One delivery basis: the named receiving point, required lot contents, requested milestone and the tasks left to the buyer.
Use the relevant product information to assemble that baseline: pipe fittings, valves and pumps need component and connection descriptions, while industrial support structures need the specified steelwork and fabrication basis. The enquiry should identify what is actually being purchased in each family.
When should you choose one supplier, split orders or a hybrid?
Select the Feasible Contracting Arrangement
Apply three tests in order. First, eliminate arrangements that lack an accepted supply route for a required product or cannot meet the delivery basis. Second, check whether the supplier and EPC team have the people and time to integrate the proposed orders. Third, compare the remaining arrangements on the same evaluated cost basis. A lower subtotal cannot make an unqualified or unmanageable arrangement suitable.
The following matrix is an editorial purchasing framework. Use the project’s actual acceptance requirements and delivery dates for the pass-or-hold decision.
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| Controlling project condition | First arrangement to evaluate | Evidence needed to proceed |
|---|---|---|
| Every product family has an accepted supply route within one offer; one package contact can manage its promised complete delivery lot | Whole package / one supplier | Itemized coverage and exclusions; actual manufacturing or processing routes; required product qualification records; an agreed document and delivery plan |
| The scope needs separate specialists; the EPC team has allocated cross-order integration work and can assemble the required lot | Split orders / multiple suppliers | Accepted evidence for each family; order boundaries; a named EPC coordinator with allocated time; aligned supplier delivery and record schedules |
| Closely connected pipe, fittings and valves can form one qualified package, while steelwork requires a different specialist | Hybrid / grouped piping plus separate steelwork | Accepted coverage for the grouped items; separate steel qualification; a defined piping-to-steel boundary; an owner for that remaining interface |
| A critical item’s supply route, controlling drawing revision, delivery feasibility or necessary cost input is unresolved | Hold the award; keep only provisional options | Obtain the missing document, supplier response or supported buyer-cost estimate. Record the gap explicitly before approving the purchase |
Separating product families is not the same as keeping two approved sources for one critical valve or pipe item. Assess backup sources against the same product requirement, upstream route and recovery need in a separate continuity decision.
Worked example: choose a hybrid package for a pump station
Illustrative scenario: all suppliers, documents and project conditions below are hypothetical. The EPC team is buying pipe, fittings, valves and fabricated support steel; the buyer purchases the pump separately. The three arrangements use the same approved BOM, preparation requirements and receiving milestone.
Assume the buyer has accepted supplier A’s product-specific evidence for the pipe and component routes in its offer. A has an agreed contact and document schedule for that piping package, but has not substantiated its proposed support-steel source. Specialist D has accepted evidence for the specified steelwork. An alternative fully split route uses qualified pipe supplier B, component supplier C and steel supplier D.
The EPC team has allocated an owner and review time for the boundary between a complete piping package and the steelwork. It has not allocated the additional work needed to reconcile pipe and component inputs across B and C’s separate orders. The proposed delivery plans can meet the receiving milestone; the quoted scopes still need the cost checks in the next section.
Preferred procurement arrangement: place the pipe, fittings and valves with A, and the support steel with D. This hybrid uses the evidenced coverage already available and leaves the EPC team with the cross-package work it has actually planned. Eliminate A’s whole-package proposal until its steel route is accepted. Keep the fully split B/C/D alternative on hold until its additional integration work is staffed and costed.
Proceed with the hybrid enquiry and close its commercial gaps before award. This is a choice of procurement arrangement, with a defined award hold, rather than a claim that the hybrid is cheapest. The quotation example below identifies what remains to be priced.
What would change the decision? A whole-package offer becomes eligible if A substantiates the steel source and covers the agreed delivery scope. The split route becomes eligible when the EPC team allocates its additional integration work. Once both routes pass those tests and their costs are complete, an evidenced cost or delivery advantage can change the preference. If the pump connection drawing changes, reopen the affected interface record before releasing its parts.
Put the quotations on the same cost basis
Price the Included and Separate Work
Continue the hypothetical pump-station enquiry. Compare the hybrid offers from A and D with the separate B/C/D offers, using the same BOM, required preparation and named receiving warehouse. Keep the currency, quantity basis, quotation validity and delivery rule consistent. The buyer’s pump, project design and site installation remain outside both supply comparisons.
Mark each cost once: Included means it is already inside the identified quote price; Separately quoted means add the referenced price once; Buyer borne means the EPC budget must carry a supported estimate; Pending means the necessary scope or price is still unresolved. Buyer borne identifies responsibility—it does not mean the cost is known.
For offers using Incoterms, record the rule, named place and version. ICC’s Incoterms 2020 explanation identifies A9/B9 as the consolidated cost-allocation location. Match that delivery allocation to the enquiry’s actual logistics tasks.
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| Common cost item | Hybrid A + D | Split B + C + D |
|---|---|---|
| Listed pipe, fittings, valves and support steel | Included — identified piping-package and support-steel quotes | Included — identified pipe, component and support-steel quotes |
| Required pipe preparation and support-steel finish | Included — within the identified product quotes | Pipe work included; support-steel finish separately quoted |
| Specified product records and inspection | Included — records and inspection identified in the product quotes | Pending — component inspection scope and charge; other listed records included |
| Agreed export packing | Included — within the quoted product prices | Included — within the quoted product prices |
| Freight to the same named warehouse | Separately quoted — complete package freight | Pending — component freight; pipe and steel freight quoted |
| Receiving and unloading at that warehouse | Buyer borne — receiving/unloading estimate needed | Buyer borne — receiving/unloading estimate needed |
| EPC integration work outside supplier scope | Buyer borne — integration effort and rate estimate needed | Buyer borne — cross-order integration effort and rate estimate needed |
For the hybrid, add the piping-package quote, support-steel quote and separately quoted package freight. For the split route, add the pipe, component and support-steel quotes, the separate steel-finish charge, and quoted pipe/steel freight. Preparation, packing or records already included in a product price stay inside that price.
Complete the split subtotal with the pending component inspection and freight charges. For each route, then add supported buyer estimates for receiving/unloading and integration work. If a revised component price includes inspection or freight, remove that separate charge from the addition. The completed total must cover each common-scope task once.
Comparison result at this stage: the hybrid supplier scope is priced, its remaining buyer work is not yet budgeted, and the split offer has two supplier-price gaps as well as unbudgeted buyer work. Do not rank the two known subtotals as final costs. Ask C for the inspection and freight response, obtain supported receiving and coordination estimates for each route, then compare the completed totals. No monetary saving can be concluded from this example.
Keep possible delay or recovery exposure in a separate risk note unless there is a defensible estimate. An unpriced risk is a recorded uncertainty, not a zero-cost assumption.
Turn the choice into an RFQ and a usable interface record
For the selected hybrid enquiry, send A the pipe and component item list, required equipment-interface drawings and inspection schedule. Send D the support-steel item list, specified fabrication basis and finish. Give both the controlled piping-to-steel references and receiving-lot schedule. Request itemized coverage, exclusions, price references and the person responsible for each supplier response.
Use the steel pipe RFQ checklist for the pipe line descriptions and attachments. Use steel pipe buying and inspection for the pipe-specific order-to-record and receiving checks. The interface record below adds the cross-package evidence needed by this enquiry.
Keep three responsibilities distinct in this record: the evidence provider supplies the drawing or schedule, the coordinator reconciles the inputs, and the project-appointed approval owner accepts the technical result. A supplier contact collecting documents does not by itself accept project design responsibility.
For the pump connection, read the equipment drawing together with the proposed flange, gasket and bolting details. KSB’s flange-type reference describes different sealing-face arrangements and separate sealing-element specifications. The connection review therefore needs the complete proposed set, rather than only a nominal pipe size.
Hypothetical interface record — acceptance applies only to the listed revisions.
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| Record field | Illustrative entry |
|---|---|
| Interface | IF-01: buyer-supplied pump P-101 nozzle N1 / piping line L-101 |
| Document basis | Equipment drawing ED-101 Rev B; line sheet LS-101 Rev C; supplier proposal CP-101 Rev 02 |
| Who provides and reviews | Buyer equipment-data owner and supplier A provide their inputs; the EPC coordinator reconciles them; the project-appointed piping reviewer accepts the technical result |
| Accepted connection and supply | IR-101 Rev 02 records acceptance of the connection; accepted quote A-S01 Rev C includes the gasket and bolting |
| Closure and recheck | This interface is closed against those revisions only. Reopen it if the equipment or line basis changes; other package and award checks remain separate |
Frequently asked questions
What should the RFQ say when a bidder cannot substantiate one product family?
Request a revised offer that either identifies an acceptable supply route with the required evidence or removes that family from its priced scope. Keep the excluded items visible in the common BOM and seek a qualified separate offer for them. Any proposed substitute follows the project’s acceptance process before it is treated as equivalent.
Can the same bidder quote both a complete package and separate lots?
Yes. Request clearly labeled alternatives against the same quantities, preparation, document schedule and delivery basis. Identify shared charges and discounts in each alternative so you do not combine incompatible prices. Those options compare commercial packaging; they do not establish independent backup sources.
Can the supplier ship part of the package before the rest is ready?
Yes, if the order permits partial delivery or the buyer agrees to it. Define each shipment’s items, quantities and required records, and confirm any extra logistics costs before dispatch. At receiving, record shortages, damage and rejected items against that shipment. Keep the remaining balance visible; receiving one lot does not complete acceptance of the entire package.
What should a change order include after award?
Identify the affected BOM lines and drawing revisions, then obtain the supplier’s response on price and delivery. Check whether fabrication has started and whether existing materials can still be used. Follow the purchase order’s change terms and agree the revised scope in writing before releasing changed work. Update connected orders when the change affects their dimensions, quantities or timing.
Does a successful trial order qualify a supplier for the full package?
No. Use it as evidence for the products, processes and shipment size actually tested. For the full order, check the planned production capacity, manufacturing routes, delivery commitments and required records. Review differences in grades, fabrication, finishes and quantities. Treat a move from a trial lot to the full project package as a separate purchase decision.
Who handles defect reports if a package includes products from several factories?
The purchase order should name the contact at the commercial supplier and explain how claims will be handled. Send that contact the affected item references, quantities, receipt details and inspection evidence. Request a written response with the proposed investigation, correction and timing. Specify these arrangements before award so factory involvement does not leave the reporting route unclear.
Technical Basis and Source Scope
Source basis: ICC, Incoterms 2020 rules, named delivery rule and cost-allocation framework; KSB Centrifugal Pump Lexicon, Flange type, for sealing-face and sealing-element distinctions. The pump-station choice, document references and cost worksheet are hypothetical, not supplier performance data.
