Stock house and gas ducts
Round and rectangular ducts for stock house dedusting, gas cleaning and ventilation in steel plants.
About stock house and gas ducts
Duct packages run to many pieces and tonnes, so match marking and dimensional control matter as much as welding. Every piece is match-marked to the layout drawing for site erection, and painted to your specification.
Send your GA drawing for a fabrication quote
Drawings, QAP and quantities to info@teshigroup.com, or use the form. We review and reply with price and schedule.
How a fabrication job runs
Drawing and QAP review
We check your GA drawings, QAP and specification, and raise queries before material is ordered.
Material and cutting
Plate is checked against mill certificates, then cut with heat numbers transferred to each part.
Rolling, fit-up and welding
Parts are rolled, fitted and welded to qualified procedures by qualified welders.
Testing and dispatch
NDT, any PWHT and dimensional checks are completed, then the job ships with its dossier.
Welding, NDT and documents
Welding
Procedures and welders qualified to ASME Section IX. WPS and PQR submitted for approval with the QAP.
NDT
- Radiography and ultrasonic testing
- Dye penetrant and magnetic particle testing
- Extent as per your QAP and design code
Heat treatment
Post-weld heat treatment where the code or specification requires it, with recorded charts.
Dossier
Material certificates, weld maps, NDT reports, dimensional reports and test records, compiled per item.
Plate materials
| Material | Specification |
|---|---|
| Structural and boiler plate | IS 2062 E250 / E350, ASTM A516 Gr 60 / 70, ASTM A36 |
| Chrome-moly plate | ASTM A387 Gr 11 / 22 |
| Stainless plate | ASTM A240 304L, 316L, 321, 310S |
| Super-austenitic and duplex | ASTM B625 904L, A240 S31254, S32205, S32750 (guide) |
| Titanium and nickel alloys | ASTM B265 titanium; B443, B424, B575 nickel-alloy plate (guide) |
Questions buyers ask
Do you paint ducts before dispatch?
Yes, surface preparation and painting are done to the paint specification in your order. State the system and DFT required.
Get a quotation from the manufacturer
Send your BOQ, drawing or tender reference. You deal directly with the manufacturer.
- Reply from our estimation team, usually within one working day
- Carbon steel to titanium on one order
- EN 10204 3.1 or 3.2 certificates, third-party inspection welcome
- ISO 9001:2015 certified and IBR approved, since 1971
Drawings and BOQ spreadsheets are easiest by email. Mention your project name.