Shop Pipe Spool Fabrication
Pipe Spool Fabrication in Houston, TX
WeldIT has fabricated pipe spools to ASME B31.1 and B31.3 for 20 years from our 40,000 sq ft shop at 12243E-1 FM 529 in northwest Houston. Spools arrive tagged, inspected and documented, in the order your crew will set them, so your field welders tie in instead of cutting. Quotes in 48 hours; standard packages in about a week.
ASME B31.1 and B31.3 Pipe Spools, Built in Our Houston Shop
We build from your P&IDs, isometrics or 3D model, break the system at the points your install plan needs, and fabricate every spool under shop control: fixtured fit-up, welding to the qualified WPS, in-process visual inspection by our AWS Certified Welding Inspector, and third-party NDE to your spec.
Fewer field welds means less hot work inside a live unit, shorter tie-in windows during a turnaround, and a documentation package your owner’s inspector can sign off without chasing anyone. We serve refineries, terminals, power plants, marine yards and commercial mechanical contractors across Greater Houston and the Gulf Coast.
What We Fabricate
Shop-built spools and assemblies from your drawings, in the materials and pressure classes Houston industry runs on.
| Pipe sizes | Small-bore through large-bore, any schedule. No shop diameter limit; two 15-ton overhead cranes handle heavy-wall and large-OD spools. |
| Materials | Carbon steel (A106, A53, A333 Gr. 6 low-temp), stainless (304/304L, 316/316L), chrome-moly (P11, P22), nickel alloys (Inconel, Monel). See exotic alloy fabrication. |
| Pressure classes | 150# through Class 900 routinely; higher classes quoted to spec. |
| Assemblies | Headers, manifolds, reducers, tees and branch connections, flanged spools, valve assemblies (API 6D, Cameron and similar), nozzles and instrument taps, pipe shoes and supports, tie-in pieces. |
| Services | Steam, condensate, chilled and hot water, cooling water, fuel gas, process gas, hydrocarbon, cryogenic and low-temperature, acid and caustic, raw water and wastewater, fire protection. |
| Welding processes | GTAW (TIG), SMAW, GMAW, FCAW. TIG root with SMAW or FCAW fill where the spec calls for it. |
| Skid-mounted piping | Spools built onto structural skids in the same shop. See skid packages. |
Codes, Procedures and Welder Qualifications
Every spool is built to the code on your line list and to your owner specification where it is stricter.
- ASME B31.1 power piping and B31.3 process piping
- Welders qualified to ASME Section IX; API 1104 for pipeline tie-ins; AWS certified in SMAW, GTAW and GMAW with 6G position qualification
- We weld to your WPS and PQR. If you have none, we supply qualified procedures for carbon, stainless, chrome and nickel alloys
- AWS Certified Welding Inspector on staff reviews fit-up and finished welds
- Heat numbers tracked from receipt through shipment; every pipe, fitting and flange backed by an MTR
Spools are tagged by line number and install sequence, open ends capped, and loaded in the order they come off the truck.
Quality and Capacity
Inspection, Documentation and Shop Capacity
100% visual inspection by our AWS CWI and a dimensional fit-check of every spool against the drawing or model before it ships.
Hydrostatic testing in our shop on NIST-traceable gauges, to the test pressure your spec calls for.
Radiography (RT), ultrasonic (UT), liquid penetrant (PT), magnetic particle (MT) and PMI through an independent inspection company, so results are impartial and accepted by owners and Class surveyors.
Hold points are set at quote stage so testing never surprises the schedule.
Per spool: weld map, weld log with welder IDs, heat number log, MTRs, third-party NDE reports, hydrotest certificate and as-built spool drawing.
Delivered with the spools, not after, so your QA team and the owner’s inspector can close out on receipt.
40,000 sq ft shop with two 15-ton overhead cranes and two 1-ton jibs; 25 welders and fitters on the floor, 8 in the office on estimating, QC documentation and scheduling.
Heavy-haul access at 12243E-1 FM 529 near Highway 290 and Beltway 8. Standard spool packages in about a week; 24-hour response line for shutdowns and emergency changeouts; quotes within 48 hours.
Recent Work
Pipe Spool Projects
Class 900 MSO Line Spool, Energos Freeze
3” Sch 80 A333 Gr. 6 low-temperature carbon steel, 992 mm overall, with two API 6D trunnion-mounted ball valves (NACE MR0175) and ANSI Class 900 flanges. Fabricated to ASME B31.3; 100% RT and PT with zero relevant indications; hydrotested to 3,000 psig. Delivered to the Port of Houston with a full data package for shipboard installation.
Carbon Steel Process Spools, New Gulf Coast Refinery
Thirty 4” Sch 40 carbon steel pipe spools with welded elbows and branch connections for a new refinery unit on the Gulf Coast, fit up on stands and welded by our rig crew to ASME B31.3. 100% visual inspection by our CWI, radiographic testing (RT) on pressure welds, and full MTR traceability. Spools were tagged by line number and staged in install order so the site crew could set and tie in without field cutting.
Webster Aeration Improvements Project
Twenty-one 4” Sch 80 316L stainless spools repaired and re-fabricated in the shop for the Webster Aeration Improvements Project at the Webster, TX wastewater treatment plant, then tied in on site by our mobile crew to keep the plant’s shutdown window short.
Industries
Who We Build Pipe Spools For
Refining, Petrochemical and Midstream
Process, utility and offsite piping for refineries and chemical plants along the Ship Channel; tank farm and terminal piping; pipeline tie-ins to API 1104. Crews are HASC-vetted and TWIC-carded for plant and terminal access.
Power and Commercial Mechanical
Boiler, steam and condensate loops for cogeneration and utility plants; chilled water, hot water and steam risers for hospitals, data centers, high-rises and central plants, where spools have to fit a mechanical room on the first try.
Marine, Water and Food Plants
ABS/DNV-documented spools for vessels at Texas ports; 304 and 316L process piping for water and wastewater treatment; sanitary stainless for food and beverage facilities.
How a Spooling Job Runs
Drawing Review
We check line classes, codes, tie-in points and shipping limits, and call out anything that won’t fit the truck or the door. Field verification of tie-in dimensions on request.
Spool Breakdown and Quote
We mark spool breaks on your isos, build the cut list, and return a quote with lead time within 48 hours.
Material, Fit-Up and Welding
Material from your supply or ours, heat numbers logged at receipt. Fixtured fit-up, welding to the qualified WPS, in-process visual inspection by our CWI.
NDE and Documentation
Third-party NDE and hydrotest per spec. Weld maps, heat logs, MTRs, NDE reports and test certificates assembled per spool.
Tag, Protect and Ship
Loaded in install sequence with ends capped. Our mobile welders are available for tie-ins and adjustments at your site.
Frequently Asked Questions
Isometrics or P&IDs, the line list or spec with codes and materials, quantities, and your need date. A 3D model helps but isn’t required; photos and field sketches are fine to start.
Yes. We build to ASME B31.1 and B31.3, with owner specifications applied on top where they are stricter.
Yes. If you don’t have procedures for a material, we supply qualified ones.
Radiography, ultrasonic, liquid penetrant, magnetic particle and PMI through an independent third-party inspection company; hydrostatic testing in our shop. Our CWI performs 100% visual inspection.
Weld maps, weld logs, heat number logs, MTRs, NDE reports and hydrotest certificates, organized per spool.
Carbon steel including A333 low-temperature grades, 304/316 stainless, chrome-moly, and nickel alloys such as Inconel and Monel.
About one week for a standard spool package once drawings are approved. Shutdown and emergency changeouts go on the 24-hour line and are scheduled around your outage.
Yes. We send a fitter to field-measure tie-ins before fabrication when drawings don’t match existing conditions.
Yes. Our mobile crews handle tie-ins and adjustments at your site.
The shop is at 12243E-1 FM 529, Houston, TX 77041, near Highway 290 and Beltway 8. We deliver across Greater Houston and the Gulf Coast, including the Ship Channel, Baytown, Pasadena, Deer Park, La Porte, Beaumont and Port Arthur.
Send Us Your Isos
Send your drawings or spec and we’ll return a spool breakdown, lead time and price within 48 hours. Shop at 12243E-1 FM 529, Houston, TX 77041. 24-hour emergency line: (866) 338-0491.
Safety is built into the shop layout, not added at the end. Dedicated fit-up bays, two 15-ton overhead cranes rated and inspected for heavy-wall and large-OD spools, engineered rigging for every lift, and fume extraction at each welding station. Crews carry current HASC and TWIC credentials, so the same procedures travel with our field welders onto refinery and terminal sites. Every job starts with a JSA; hot work, confined space and lockout follow your site rules.
25 welders and fitters on the shop floor, qualified to ASME Section IX and API 1104 with 6G position certs in GTAW, SMAW, GMAW and FCAW, supported by 8 estimating, QC-documentation and scheduling staff. An AWS Certified Welding Inspector reviews fit-up and finished welds. Our rig crews are the same people who build the spools, so field tie-ins are done by welders who know the package.
One shop, one standard, from drawing review to field tie-in. Quotes in 48 hours from your isos. Standard spool packages in about a week. Spools tagged by line number and loaded in install order, with the MTRs, weld maps and NDE reports in the truck, not in the mail. When one supplier owns the shop fabrication and the field welding, fit-up problems stop being someone else’s fault.
Pipe spools fabricated to ASME B31.1 and B31.3, with owner specifications applied where stricter. Welders qualified to ASME Section IX and API 1104; AWS Certified Welder credentials in SMAW, GTAW and GMAW. Structural skids and supports to AWS D1.1. Marine spools documented for ABS and DNV surveyor sign-off. Third-party RT, UT, PT, MT and PMI through an independent inspection company; hydrotest in our shop on NIST-traceable gauges.
40,000 sq ft at 12243E-1 FM 529, Houston, TX 77041, with heavy-haul access to Highway 290 and Beltway 8. Ship Channel, Baytown, Pasadena and Deer Park plants are within about an hour; Beaumont, Port Arthur and the Texas ports on the same day. Your engineers and inspectors are welcome in the shop for hold-point witness and fit-checks before anything ships.
Need the work done at your site instead? Our rig crews handle tie-ins, emergency pipe repair, field spooling and turnaround support. On-site pipe welding, tie-ins and repair →
TESTIMONIALS
What Our Clients RAVE About!
Serving Houston & the Gulf Coast with Certified Expertise
WeldIT is strategically located to provide rapid mobilization for industrial and commercial projects across the Greater Houston area. Our central location allows our certified welders to efficiently serve plant managers and owners in Houston, Spring, and surrounding municipal districts.
Ready to Start Your Project?
From emergency mobile repairs to complex ASME pipe spooling, WeldIT has the capacity and certification to get the job done right. Send us your drawings or call us for immediate dispatch.