FABRICATION INSIGHTS FROM PASCAGOULA, MS

Practical guidance from JMC Fabrication on pipe spool vs stick-built tradeoffs, material selection, code compliance, and project planning for commercial, marine, and oil & gas work across the Gulf Coast.

• October 6, 2026Vaned Elbows vs. Radius Elbows: Which Should Your Duct Use?Mitered elbows with turning vanes and smooth radius elbows both turn air 90 degrees, but they differ in pressure loss, space, noise, and cost. Here's how to choose for rectangular duct.
• October 6, 2026Pre-Galvanized vs. Hot-Dip Galvanized Steel: What's the Difference?Pre-galvanized sheet is coated at the mill before fabrication. Hot-dip galvanizing after fabrication dips the finished part. Coating thickness, cut edges, welds, cost, and which one a Gulf Coast project needs.
• October 6, 2026What Is an Equipment Skid Base, and How Is It Built?A skid base is the structural steel frame that equipment is mounted, piped, and shipped on. Here's how skid bases are designed and fabricated, from the frame and drip lip to lifting points, flatness, and coating.
• October 6, 2026Sheet Metal Gauge Chart: How Thick Is Steel, Galvanized, Stainless, and Aluminum?The same gauge number means a different thickness in steel, galvanized, stainless, and aluminum. A 10 to 26 gauge thickness chart in inches, plus how gauge gets specified for duct and fabricated parts.
• September 24, 2026What Is a Pipe Spool Drawing, and What Should It Include?A pipe spool drawing is the shop-ready isometric a fabricator builds from. Here's what belongs on one, where the information comes from, and the details that cause the most rework when they're missing.
• September 24, 2026What Should You Look for in a Pipe Fabrication Contractor for Oil and Gas Projects?How EPC firms and owners vet a pipe fabrication subcontractor for oil and gas work: weld procedures, welder qualifications, traceability, NDE, testing, turnover documentation, and Gulf Coast logistics.
• September 24, 2026Which Corrosion-Resistant Alloys Work Best in Marine Applications?A practical comparison of corrosion-resistant alloys for marine environments: 316L and duplex stainless, marine aluminum, copper-nickel, titanium, and galvanized steel, and where each one belongs.
• September 24, 2026Which Stainless Steel Grades Can Be Fabricated and Welded? 304, 316, 420, and 440 ComparedNot every stainless steel welds the same. How 304 and 316 compare with ferritic, duplex, and martensitic grades like 420 and 440, and what to expect when a drawing calls for a hard-to-weld grade.
• September 24, 2026How Do You Design a Steel Fabrication for Hot-Dip Galvanizing?Hot-dip galvanizing works best when the fabrication is designed for it. Vent and drain holes, overlapping surfaces, kettle size, distortion, surface prep, and what to do about welding after galvanizing.
• September 2, 2026How Much Lighter Is Aluminum Than Steel for Fabrication?Aluminum weighs roughly a third of steel for the same volume. What that actually means for a fabrication project, and when the weight difference is worth the higher material cost.
• September 2, 2026What Tolerances Should You Expect from a Structural Steel Fabricator?Real AISC-standard tolerances for structural steel fabrication: mill tolerances, camber and sweep, column length, and connection hole alignment, and why erection problems usually trace back to tolerance stacking.
• September 2, 2026What Aluminum Alloy Should You Use for Marine and Coastal Fabrication?5052, 5083, 6061, or 6063: which aluminum alloy actually fits a marine hull, a coastal structure, or an architectural piece, and why the wrong choice shows up as corrosion years later.
• September 2, 2026What Is an MTR? Material Test Reports and CMTRs ExplainedAn MTR is the mill's certified record of a material's chemistry and mechanical properties, tied to a heat number. Here's what's actually in one, and when a project needs full heat-level traceability versus a basic mill cert.
• August 19, 2026Carbon Steel vs. Galvanized Steel Fabrication: Which to SpecifyThe practical difference between bare carbon steel and galvanized steel for fabrication projects, when each one is the right call, and where the line actually is.
• August 19, 2026Pipe Spool Fabrication Tolerances and Quality ChecksWhat dimensional tolerances matter on a fabricated pipe spool, the quality checks that happen before it ships, and why a spool that's slightly off can stop a field crew cold.
• August 19, 2026Specialty Weldments: What They Are and When You Need Custom FabricationWhat separates a specialty weldment from a standard fabricated part, when a project actually needs custom weldment fabrication, and what to give a shop to get an accurate quote.
• August 19, 2026Wall and Deck Penetration Fabrication for Marine and Industrial ProjectsHow structural and pipe penetrations are fabricated for marine bulkheads, decks, and industrial walls, what information a fabricator needs, and why fit matters more than it looks.
• August 19, 2026Pump Skid Design and Fabrication: What's Included and How It's BuiltWhat goes into a fabricated pump skid, how the build process works from drawings to delivery, and what to include in an RFQ to get an accurate quote.
• July 22, 2026Commercial Duct Fabrication Lead Times: What Drives Them and How to Compress ThemThe real drivers of commercial duct fabrication lead time and how mechanical contractors can compress it, covering drawings, material, and shop capacity.
• July 15, 2026Rectangular, Round, and Spiral Duct: Choosing the Right Shape for Commercial HVACHow duct shape affects airflow, leakage, space, noise, and cost, comparing rectangular, round, spiral, and flat-oval duct.
• July 13, 2026Commercial Duct Gauge and Static Pressure ExplainedHow duct gauge is selected from duct size and SMACNA static pressure class, why pressure class drives reinforcement and sealing, and how it controls cost and compliance.
• July 13, 2026How to Spec a Commercial HVAC Duct Package for FabricationWhat a duct fabricator needs to quote and build a commercial package accurately, and how a complete spec prevents rework, RFIs, and schedule slips.
• July 13, 2026SMACNA Seal Classes A, B, C and Duct Leakage ClassesHow seal class and leakage class differ, why they tie to pressure class, common sealing methods, and when commercial jobs require leakage testing.
• July 13, 2026Marine and Shipboard HVAC Duct FabricationHow shipboard HVAC duct differs from commercial building duct, and why Gulf Coast fabrication and marine welding experience matter for shipyard work.
• July 13, 2026Stainless Steel Duct for Corrosive and Washdown EnvironmentsWhen galvanized duct is not enough, stainless is the right call. Grade selection, finish, welding, and cost tradeoffs for corrosive and washdown duct.
• July 13, 2026Duct Fittings and Accessories: Elbows, Transitions, Takeoffs, and DampersThe custom fittings a fabricator builds beyond straight duct, why shop-fabricated fittings beat field-cut work, and how complexity drives lead time.
• July 13, 2026HVAC Duct Fabrication for Gulf Coast Commercial ProjectsWhy sourcing commercial HVAC duct from a regional Gulf Coast SMACNA fabricator beats shipping it in: shorter lead times, lower freight, and easier coordination.
• July 8, 2026Galvanized vs. Stainless Steel Duct: Choosing the Right Material for Commercial HVACWhen commercial HVAC duct calls for galvanized and when it needs stainless, covering corrosion, environment, grade selection, and cost.
• July 2, 2026Industrial Exhaust and Dust Collection Duct Fabrication: How It Differs from HVAC DuctWhy industrial exhaust, dust collection, and process ventilation duct is built differently from commercial HVAC duct, and how JMC Fabrication approaches industrial ductwork.
• July 2, 2026Double-Wall and Insulated Duct: When You Need It and How It Is BuiltWhen to specify double-wall or insulated duct, how it is constructed, and the tradeoffs versus single-wall duct with an external wrap.
• July 1, 2026SMACNA Duct Construction Classes Explained: Pressure Class, Gauge, and ReinforcementA plain-language guide to SMACNA duct construction classes covering pressure class, gauge, seams, joints, and reinforcement for commercial HVAC duct.
• May 13, 2026Carbon Steel vs. Stainless Steel Fabrication: Choosing the Right Material for Marine and Industrial ApplicationsHow carbon and stainless steel compare on corrosion, weldability, and cost, and how to choose between them for marine, oil and gas, and commercial HVAC fabrication.
• May 8, 2026Spooled Piping vs. Stick-Built Piping: When Each Makes Sense for Your ProjectA practical framework for when shop-fabricated pipe spools beat stick-built field piping, and the scenarios where field assembly is still the right call.

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  Pipe spools, HVAC duct, custom metalwork, and material-specific capabilities.

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  Marine, oil & gas, and commercial vertical pages.