What Is a PO? Purchase Order Terms

A Purchase Order (PO) is the formal, legally binding document issued by a buyer to a vendor that authorizes the supply of specified materials or equipment at an agreed price, delivery schedule, and set of commercial terms. The PO is the culmination of the procurement cycle—from MRQ through RFQ, technical bid evaluation, and commercial bid evaluation.

Once the vendor acknowledges the PO, it becomes a contract. Both parties are bound by its terms.

Standard PO Sections

Section	Content
PO number	Unique identifier for tracking (e.g., PO-PROJ-PIP-0042)
Vendor details	Supplier name, address, contact, bank details
Buyer details	Purchasing entity, project name, authorized representative
Scope of supply	Line items with description, specification, quantity, unit price, total price
Incoterms	Delivery basis (e.g., FOB Shanghai, CIF Jubail). See Incoterms guide
Delivery schedule	Required dates for manufacturing milestones and shipment
Payment terms	Advance %, progress payments, final payment trigger
Inspection requirements	ITP, hold/witness points, third-party inspection agency
Documentation	Required shipping documents, MTCs, test reports
Warranty	Period, scope, defect remedy obligations
Liquidated damages	Penalties for late delivery (typically 0.5-1% per week, capped at 5-10%)
General terms and conditions	Project-specific T&Cs or company standard T&Cs

PO Commercial Terms

Term	Typical Range	Notes
Advance payment	10-30% of PO value	Against bank guarantee or standby LC
Progress payment	20-40% at material readiness	Against inspection release note
Balance payment	30-50% after shipment	Against bill of lading and document presentation
Retention	5-10%	Released after warranty period or mechanical completion
LD cap	5-10% of PO value	Maximum liquidated damages for late delivery
Warranty period	12-24 months from delivery or MC	Whichever comes first
Payment method	Wire transfer, letter of credit	LC common for orders above $100,000

Common Mistake

Issuing a PO without specifying the exact Incoterm and named place. “FOB” alone is incomplete—it must be “FOB Shanghai” or “FOB Mumbai.” Without the named port, the risk transfer point is undefined, and disputes arise over who bears inland transport and port handling costs. Always specify the full Incoterm per ICC Incoterms 2020.

PO Lifecycle

Phase	Activity	Duration
Issuance	PO sent to vendor	Day 0
Acknowledgment	Vendor confirms acceptance (or raises clarifications)	3-5 days
Kick-off meeting	Align on schedule, ITP, documentation requirements	Week 1-2
Manufacturing	Production per PO specifications	8-24 weeks
Inspection	Per ITP; hold points for witness/third-party inspection	During manufacturing
Shipment	Delivery per Incoterms; shipping documents issued	Per schedule
Document submission	Vendor submits final documentation package	Within 4 weeks of shipment
Payment completion	Final payment against compliant documents	Per payment terms
Warranty	Defect liability period	12-24 months

PO Amendments and Variations

Scope changes after PO issuance are managed through PO amendments (also called change orders or variation orders). Each amendment must be formally documented and agreed by both parties.

Change Type	Example	Impact
Quantity increase	+50 tons of pipe added to MTO	Price adjustment, delivery extension
Specification change	Upgrade from Sch 40 to Sch 80	Price increase, possible lead time change
Delivery acceleration	Move shipment date forward by 4 weeks	Expedition premium (5-15% typical)
Incoterms change	FOB to CIF at buyer request	Price adjustment for freight and insurance

The PO is the backbone of EPC procurement. Every downstream activity—expediting, inspection, shipping, payment—references the PO number. For the complete procurement document flow, see the project procurement documents guide.

Read the full guide to pipe classes and specifications