Requesting Bids for Stainless Steel Process Piping Installation

When requesting bids for stainless steel process piping installation, the RFQ must define its technical scope and its commercial boundary, or the bids you receive will not be comparable. Paul Industries bids, fabricates and installs cGMP sanitary process piping nationwide, to ASME B31.3, ASME BPE and ASME Section IX. This is the checklist we wish every RFQ used.

Generic construction RFQ advice does not work for hygienic process piping. The commercial sections are the same; the technical sections are not, and the items that generic templates omit are exactly the ones that make bids incomparable. This is a checklist for requesting bids on stainless steel sanitary process piping, written from the receiving end – Paul Industries bids and installs this work across the United States.

The single most valuable thing an RFQ can do is define its scope boundary. If one bidder includes passivation, examination and qualification support and another does not, the cheapest bid is simply the one that excluded the most. Everything below exists to prevent that.

Section 1 – Technical scope: the items generic templates omit

Section 2 – Documentation deliverables

List these explicitly. A turnover package assembled as an afterthought is the most common source of post-completion disputes, and the cost of producing it properly is real and belongs in the bid.

• Material test reports traceable to heat number for every product-contact component
• Welding procedure specifications and procedure qualification records (ASME Section IX)
• Welder performance qualifications, current at the date of each weld
• Weld map and weld log, every weld identified
• Examination and borescope records, with images retained against weld ID
• Retained weld coupons
• Passivation record with the acceptance test result
• Slope and drain verification records
• Pressure test records
• As-built drawings and isometrics
• Instrument index with calibration certificates

Full detail on each of these and the regulation it answers to is in what a turnover package should contain.

Section 3 – Commercial and boundary items

Section 4 – A scope-of-work skeleton you can copy

Adapt the bracketed items. The point is not the wording but that every bidder answers the same questions.

1. Project and location. Facility, area, product or process served, regulatory context (cGMP, FSMA, USDA).
2. Scope summary. Approximate footage by line size, number of tie-ins, equipment to be connected.
3. Codes and standards. Named by number, with fluid service category.
4. Materials. Grade, specification, traceability requirement.
5. Fabrication and welding. Method, examination percentage, coupon regime, witness requirements.
6. Surface treatment. Finish, passivation designation, acceptance test.
7. Testing and acceptance. Pressure test, drain test, final flush endpoint.
8. Documentation. The deliverable list, and when it is due relative to final payment.
9. Commercial boundary. The inclusions and exclusions from Section 3.
10. Schedule. Access windows, milestones, shutdown constraints.
11. Bid format. Require a common breakdown so bids can be compared line by line.

The five omissions that make bids incomparable

In practice, most unexplained price spread between sanitary piping bids traces to the same short list. If you fix only five things in your RFQ, fix these.

Related: how to choose a process piping contractor covers evaluating the firms that respond, and sanitary process piping cost covers what drives the number itself.

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Standards referenced: ASME BPE · ASME B31.3 · ASME Boiler and Pressure Vessel Code · ASTM A967 · 21 CFR 211

Related: Pharmaceutical Process Piping Installation (ASME BPE) · Process Engineering and Design Services for Hygienic Systems

Lump sum vs unit price: how the contract form changes the bids you get

The commercial form of the request shapes the numbers as much as the technical scope does, and it is usually decided by habit rather than by design.

A lump sum asks each bidder to carry the risk of quantity. It suits a package where the isometrics are complete, the tie-in points are surveyed, and the plant is empty. Everyone prices the same drawing set, comparison is simple, and the contractor owns the consequences of misreading it. Where the design is not finished, the same form produces bids padded with contingency you cannot see, and then a change order stream once the drawings catch up.

Unit pricing asks for a rate per documented weld by diameter, a rate per foot of installed tube by size, and rates for supports, tie-ins, and testing. Quantity risk stays with the owner, and the bids become directly comparable on rate rather than on assumption. It suits phased work, tie-ins into a running plant, and any scope where the final weld count will be settled during construction. Its weakness is that it rewards volume, so it needs a measured quantity procedure and someone on the owner’s side counting.

The arrangement that works on most regulated projects is a lump sum for the defined shop scope and unit rates for the field scope, with the boundary between them written into the request rather than negotiated afterward.

Estimating the job yourself before the request goes out

An owner with no private number cannot tell an aggressive bid from an incomplete one, and the quickest private number on this work is arithmetic on the isometrics. Our orbital welding cost guide makes the point directly: a loop with 200 joints at $250 a joint is $50,000 in welding before a single length of tube is bought. Count the joints, apply a rate, and you have a figure to hold each welding line against.

Check it a second way against footage. Installed sanitary process piping runs roughly $150 to $400 or more per linear foot according to our sanitary process piping cost guide, so a routing take-off gives an independent bracket. When the two methods disagree badly, the routing is usually denser in fittings than the footage suggests, which is itself worth knowing before bids arrive. A proposal that lands well below both brackets has either found an efficiency you want explained or has not read the same drawings.

What to require from bidders in their response

The request fixes the scope. A mandatory response format fixes the comparison, and it costs a bidder nothing honest to provide.

• A priced schedule in the layout you supply, so the same line numbers appear in every submission and can be read side by side.
• The bidder’s own weld count taken from your isometrics, since a count that differs from yours reveals a reading of the drawings you need to hear about now.
• A list of exclusions written as exclusions, with a signed statement that nothing outside the list has been assumed away.
• Your responsibility matrix returned completed and signed rather than acknowledged in a cover letter.
• Crew composition and shift pattern assumed in the price, because a schedule built on two shifts and priced on one will fail on one of them.
• A durations-based schedule tied to the access dates you provide, showing what slips if an area is handed over late.
• Named welding supervisor and quality representative for the job, with their qualification records attached to the bid.
• A redacted sample of a turnover package from comparable completed work, so the deliverable is seen rather than described.
• Certificates of insurance and the site-specific safety plan submitted with the bid, not after award.
• Price validity period with the escalation basis stated, naming the material index or the mechanism, so a long award cycle does not reopen the number informally.

Frequently asked questions

How do I request bids for stainless steel process piping installation?

Issue an RFQ that defines both the technical scope and the commercial boundary. Technically: name the codes by number, the material specification and traceability, surface finish, welding method, weld examination percentage, passivation designation, slope and drain acceptance, and the documentation deliverables. Commercially: state what is included and excluded, particularly scaffolding, commissioning support and qualification support. Require a common bid breakdown so responses can be compared line by line.

What should be in an RFQ for sanitary process piping?

Twelve technical items and roughly nine commercial ones. The technical set is codes by number with fluid service category, material and heat traceability, surface finish with measurement records, welding method, weld examination percentage and witness, weld documentation, coupon regime, passivation designation and acceptance test, slope with a witnessed drain test, dead-leg limit with its measurement basis, pressure testing including test water quality, and cleanliness at handover.

Why do sanitary piping bids vary so much?

Almost always because the scope boundary was left undefined, so bidders included different things. The five biggest levers are weld examination percentage, passivation designation, documentation scope, what “validation” was taken to mean, and site access assumptions. When these are unstated, the lowest bid is usually the one that excluded the most rather than the one offering the best value.

What is the difference between an RFQ and an RFP for piping work?

An RFQ asks for price against a scope you have already defined, so it suits work where you know exactly what you want built. An RFP asks bidders to propose an approach as well as a price, which suits work where the solution is still open. For sanitary piping installation with drawings in hand, an RFQ is normally correct – provided the scope really is defined, which is what the checklist above is for.

Should I require 100% weld inspection?

Rarely, and requiring it without thinking is expensive. What matters more is that the percentage is stated, that it matches the fluid service category under ASME B31.3, that a named party witnesses it, and that images are retained against weld ID. A stated 20% properly documented and witnessed is worth more than an unwitnessed claim of 100%.

How do I compare bids that include different things?

Normalize them to one boundary before comparing totals. Ask every bidder for the same breakdown – fabrication, installation, examination, passivation, testing, documentation, commissioning support – then add back the items each one excluded. The comparison only becomes meaningful once every bid covers identical scope, which is why requiring a common format in the RFQ matters more than any single specification.

Do I need to specify the welding standard in the RFQ?

Yes, by number. For pharmaceutical and bioprocessing work that is ASME B31.3 with the fluid service category stated, ASME BPE, and ASME Section IX for welder and procedure qualification. For food and dairy work it is AWS D18.1 with D18.2 for discolouration acceptance. A bidder who cannot name these has probably not worked to a written specification.

When should the turnover package be delivered?

Tie it to final payment and say so in the RFQ. Documentation assembled after the crew has demobilized is harder to produce, less accurate and frequently incomplete. Requiring the package as a condition of final payment is the single most effective way to ensure records are captured contemporaneously rather than reconstructed.

Attachments the RFQ should carry

A scope narrative alone forces every bidder to make the same assumptions privately, and they will make different ones. These attachments are what turn a description into a quantifiable scope.

Material specification items people leave out

Three items belong in the material section of a stainless piping RFQ and are frequently missing, each of which changes the price and one of which changes what you actually receive.

Tie-ins: define the boundary or own the risk

Tie-ins to existing systems are where brownfield projects lose their budgets, because the conditions behind an existing flange are unknown until it is opened. The RFQ should state, for every tie-in, five things: the boundary (where the contractor scope starts and stops), the isolation method and who provides it, the schedule window in which the system can be down, inspection and testing requirements at the joint, and who is responsible for return to service.

That last item is the one omitted most often and disputed most bitterly. If the contractor breaks into a line, who is accountable for the system working correctly afterwards – and for the product made through it? State it at RFQ stage, because after the fact it is a negotiation rather than a specification.

Responsibility matrix: the fastest way to make bids comparable

If you include only one thing from this page, include this. Ask every bidder to complete the same matrix. It surfaces the scope boundary explicitly instead of leaving it buried in exclusions nobody reads.

A bidder who returns this matrix fully completed has read the scope. A bidder who returns it partly blank has told you where the change orders will come from.

What should an RFQ for stainless steel process piping include?

A comparable bid set requires you to state the code and edition, material grade and specification, surface finish designation, weld examination level and who judges acceptance, passivation standard and verification method, the documentation package and its index to your IQ checklist, site access and shutdown constraints, and who is responsible for correcting a failed qualification test. Omitting examination level and documentation scope is why two bids for the same work differ by so much.

Writing a specification that gets comparable bids

Most bid comparisons fail because the specification left the expensive parts implicit. State these explicitly and the bids become comparable; leave them out and the cheapest bid is simply the one that assumed the least.

The single highest-value line to add to any specification: “the contractor shall supply a turnover index mapping every document to the IQ checklist item it satisfies.” It costs nothing, it is trivially auditable, and it separates contractors who document as they build from those who assemble paperwork afterwards.