Oil field pipe is the steel line pipe used at and around the wellsite, flowlines, gathering lines, and tank battery piping that move oil, gas, and produced water from the wellhead to initial processing or storage. This covers surface line pipe built to API 5L, not downhole casing or tubing (API 5CT), which B&W Pipe does not stock. B&W Pipe has supplied API 5L line pipe for oilfield gathering and distribution since 2001, with Mill Test Report certification on every order.
Oil Field Pipe Specifications at a Glance
| Spec | Detail |
|---|---|
| Material Standard | API 5L |
| Grades Available | Grade B through X70 |
| Types | ERW/HFW, SMLS, DSAW, Rolled & Welded |
| OD Range | 2⅜” through 24″ (flowline and gathering-relevant sizes) |
| Governing Design Codes | ASME B31.4 (liquid/oil gathering), ASME B31.8 (gas gathering), API 5L |
| Typical Service | Flowlines, gathering lines, tank battery piping |
| Certification | Mill Test Reports (MTRs) on every order |
| Availability | Katy, TX; Houston, TX (Patriot Pipe Services); New Braunfels, TX |
What Is Oil Field Pipe?
Oil field pipe refers to the network of surface piping connecting a well to the rest of the production system, not the tubulars run downhole inside the well itself. It includes flowlines carrying fluid from the wellhead, gathering lines consolidating flow from multiple wells, and the piping within a tank battery or facility where oil, gas, and produced water are separated and stored.
What Is Oil Field Pipe Used For?
- Flowlines: Moving fluid from the wellhead to initial separation or treatment equipment.
- Gathering lines: Collecting from multiple wellheads and routing to a central point or trunk line.
- Tank battery and facility piping: Interconnecting piping at the storage and separation site.
It’s worth being direct about scope: oil field pipe in this sense is surface line pipe. Casing and tubing, the pipe run inside the wellbore itself, fall under a separate specification (API 5CT) that B&W Pipe does not supply.
Pipe Types Matched to Oil Field Applications
- ERW/HFW: The most common choice for flowlines and gathering, covering moderate diameter and pressure requirements efficiently
- SMLS (Seamless): Specified where higher-pressure or higher-stress wellsite conditions call for it
- DSAW / Rolled & Welded: Used on larger-diameter gathering trunk lines feeding into a battery or compressor station
Grade Selection for Oil Field Pipe
API 5L grades run from Grade B through X70. Higher grades increase allowable pressure capacity independent of wall thickness, meaning a higher-grade pipe can sometimes meet the same pressure requirement at a lighter wall than a lower-grade pipe would need. For the full grade-and-schedule interaction, see our Carbon Steel Pipe Schedule Chart Explained guide.
Why Source Oil Field Pipe from B&W Pipe
Niche & Hard-to-Find Sizing
When a project needs an uncommon OD or wall combination that standard distributors have run out of, B&W Pipe’s mill relationships are built to source it.
Full Material Traceability
Every order ships with Mill Test Reports and heat certifications, giving your project the documentation trail it needs for compliance and QA records.
Three Storage Locations
Inventory across Katy, Houston (Patriot Pipe Services), and New Braunfels supports faster regional fulfillment across Texas oilfield projects than a single-yard distributor can offer.
In-House Machine Shop
Beyond straight pipe supply, B&W Pipe machines valve pups to spec in virtually any grade, wall, or diameter, relevant wherever battery or facility tie-ins need connecting components alongside the pipe itself.
Ordering Process
Step 1 – Contact Sales
Share your pipe size, grade, quantity, and delivery timeline.
Step 2 – Receive Your Quote
Get pricing and lead time on your oil field pipe order.
Step 3 – Confirm & Process
once approved, we pull from stock or source through mill partners.
Step 4 – Delivery with Documentation
pipe arrives on time with MTRs and quality records for your project files.
Related Resources
Full dimensional reference across NPS and schedule
Verify wall thickness and weight before you order
Current inventory across all three locations
Request an Oil Field Pipe Quote
Ready to source oil field pipe for your project? Contact our team for pricing and lead time.
Frequently Asked Questions
What is oil field pipe used for?
Oil field pipe moves oil, gas, and produced water from the wellhead through gathering systems to processing and storage — covering flowlines, gathering lines, and tank battery piping at the surface.
Is oil field pipe the same as casing or tubing?
No. Oil field surface pipe is built to API 5L. Casing and tubing are downhole tubulars built to API 5CT, run inside the wellbore itself, a different specification that B&W Pipe does not supply.
What pipe grade is used for oil field flowlines and gathering lines?
Grades typically range from API 5L Grade B through X70, with the specific grade selected based on the pressure and diameter requirements of that section of the gathering system.
Does oil field pipe need to be coated?
Buried flowlines and gathering lines commonly use FBE or other O.D. coatings to protect against corrosion in underground service, especially where the line will remain in the ground for the life of the well or field.
