Lines in an iron and steel plant carry three difficult conditions at once: high temperature, abrasive dust and continuous thermal cycling. Furnace surroundings, gas cleaning, cooling water, oxygen and compressed air lines each call for a different material class. Alloy pipe comes forward on hot lines, wear allowance on dust laden lines, and large bore, quickly available items on the cooling circuit.
| Line | Driving condition | Common choice |
|---|---|---|
| Furnace and stack area | High temperature, cycling | A335 P11/P22, stainless grades |
| Gas cleaning | Abrasive dust | Heavy wall carbon steel, wear allowance |
| Cooling water | Large bore, continuous duty | Welded pipe, butterfly valves |
| Compressed air and oxygen | Cleanliness, oil free | Degreased items, suitable gaskets |
| Hydraulics and lubrication | Pressure, vibration | Stainless pipe, forged fittings |
Oil free delivery for oxygen lines needs special preparation and must be stated with the enquiry.
A line that heats and cools loosens its flanged joints far faster than one at steady temperature. The leak causes we see most often are:
During planned outages, lead time turns directly into lost production. We hold fast moving flanges, gaskets and studs and nuts in stock, and plan alloy and large bore items against the outage schedule. Share your annual consumption list and we can prepare framework pricing and a stock plan for repeating items.
Which gasket is used on high temperature lines?
Spiral wound gaskets are the common answer. Above 450 °C graphite filler is more stable than PTFE, and the winding material is matched to the line material.
Do you supply oil free items for oxygen lines?
Yes, on request items are degreased and separately packed. Because this preparation takes extra time it should be stated with the enquiry.
Do you prepare stock plans before outages?
Yes. When an annual consumption list is shared we prepare framework pricing and a stock plan aligned with the outage schedule.
Share your item list, isometrics or MTO file for your iron and steel requirement; we reply with price and lead time the same day.