We supply steel systems for primary heating and mechanical distribution where larger bore routes and higher service loading make steel the right choice over copper, stainless, or plastic. These systems sit on main flow-and-return and core building-services distribution lines feeding plant and terminal services across commercial buildings.
We supply carbon steel tube for threaded and welded mechanical services where steel is selected over copper or plastic on larger bore pipework and higher duty systems. These tubes are widely used across heating distribution, plant room installations, and service mains where durability and compatibility with threaded fittings or welded fabrication are required.
Applications
Examples include:
LTHW heating distribution systems
Mechanical services pipework
Compressed air distribution systems
Fire protection pipework
Supply Support
Core steel tube lines are held in stock in common nominal bore sizes, with additional sizes sourced through established supply networks with confirmed lead times.
Red oxide coated steel tube in medium and heavy series
Hot-dip galvanised steel tube for corrosion resistant services
Screwed and socketed tube for threaded pipe installations
Plain-end tube for welded pipework fabrication
Typical sizes / options
½″ – 2″ medium series screwed and socketed tube in 6.4 m and 3.2 m mill lengths
½″ – 2″ heavy series screwed and socketed tube in 6.4 m and 3.2 m mill lengths
2½″ – 4″ heavy series plain-end tube supplied in mill lengths for welded systems
½″ – 2″ galvanised medium series screwed and socketed tube in 6.4 m and 3.2 m mill lengths
Specs / standards
EN 10255 carbon steel tube for threaded and welded pipe systems
EN 10217-1 electric welded carbon steel tube for pressure purposes
EN 10217-2 P235GH electric welded steel tube suitable for elevated temperature service and hot works
Legacy compatibility with BS 1387
Availability & warranty
Common nominal bore sizes are typically available from stock in standard mill lengths, with larger diameters supplied to order depending on project requirements.
Warranty: Warranty terms follow the relevant manufacturer specification and applicable product standards.
Malleable BSP Fittings
We supply BSP malleable iron fittings for screwed steel pipework where threaded assembly is preferred over welded fabrication on small and medium bore systems. These fittings are commonly used when extending or modifying existing threaded steel pipe networks where matching thread forms and fitting geometry are required.
Applications
Examples include:
LTHW heating distribution systems
Mechanical services pipework
Pump set and plant connection lines
Threaded steel pipe installations
Supply Support
Core threaded fitting patterns are held in stock in common sizes, with larger sizes and specialist configurations sourced through established supply networks with confirmed lead times.
Elbows, tees, and sockets for threaded steel pipework
Hex nipples and Unions including female–female and male–female patterns
Bushes, plugs, and caps for threaded line termination
Many fittings available in reducing sizes and male/female thread combinations
Typical sizes / options
Black threaded fittings available from 1/8″ – 4″ BSP
Galvanised threaded fittings available from 1/8″ – 2½″ BSP
3″ – 4″ galvanised fittings available to order
BSP threaded connection patterns across common fitting types
Specs / standards
EN 10242 malleable cast iron threaded pipe fittings
ISO 7-1 BSPT tapered pipe threads
ISO 228 BSPP parallel pipe threads
Black (self colour) and hot-dip galvanised finishes available
Availability & warranty
Common fitting patterns are typically available from stock in standard BSP sizes, with larger diameters and specialist configurations supplied to order.
Warranty: Warranty terms follow the relevant manufacturer specification and application limits.
Grooved Systems
We supply grooved mechanical pipe joining systems for steel pipework where faster installation is preferred over welded or fully threaded construction. Grooved couplings join grooved-end steel pipe using mechanical housings and elastomer gaskets, allowing rapid assembly, simplified maintenance access, and controlled pipe alignment across larger bore service mains.
Applications
Examples include:
Fire protection pipework systems
Mechanical services pipework
Plant room distribution headers
Compressed air pipe installations
Supply Support
Grooved system components are supplied to order through established supply networks, with confirmed lead times depending on size, coupling type, and system specification.
Coupling gaskets, bolts, and installation hardware
Typical sizes / options
1″ – 24″ (DN25 – DN600) grooved pipe connection sizes depending on fitting type
Compatible with roll-grooved and cut-grooved steel pipe
Suitable for standard schedule pipe including Schedule 10 and Schedule 40 steel pipe systems
Multiple gasket materials available depending on service media
Specs / standards
Grooved mechanical pipe joints manufactured to controlled groove dimension standards
Pressure-rated couplings depending on fitting type and gasket selection
Elastomer gasket materials including EPDM and nitrile for different service conditions
Availability & warranty
This range is supplied to special order with confirmed lead times depending on system size and configuration.
Warranty: Warranty terms follow the relevant manufacturer specification and approved installation methods.
Primofit Compression Fittings
We supply Primofit compression fittings for steel pipework where a mechanical connection is preferred over welded or threaded joints. These fittings allow steel pipe to be joined without hot works, making them suitable for repairs, tie-ins, and system modifications on existing steel services.
The compression joint grips the pipe mechanically while sealing using an elastomer gasket, providing a detachable connection capable of carrying full pipe end load.
Applications
Examples include:
Mechanical services pipework
Compressed air distribution
Heating system pipework
Repair and modification of existing steel pipe lines
Supply Support
Selected Primofit fittings are held in stock in common adaptor sizes, with additional fittings and connection types supplied to order depending on pipe size and configuration.
Galvanised MDPE transition female adaptors 1/2″ × 20 mm – 2″ × 63 mm with NBR seals
Specs / standards
Malleable cast iron body EN-GJMW-400-5 to EN 1562
Corrosion protection by hot-dip galvanising to EN 10344
Compatible with EN 10255 and EN 10220-S1 steel pipe systems
Maximum operating pressure up to 16 bar depending on media and seal type
Operating temperature range typically up to 80 °C (NBR), 95 °C (EPDM), or 150 °C (FKM) depending on gasket selection
Availability & warranty
Common adaptor sizes are available from stock, with additional Primofit fittings supplied to order depending on system configuration.
Warranty: Warranty terms follow the manufacturer specification and installation requirements.
Weld Fittings & Flanges
We supply carbon steel weld fittings and flanges for fabricated steel pipework systems where welded construction and flanged equipment connections are required. These components are typically used when building new pipework assemblies, flanged headers, and equipment connections into existing steel mains.
Applications
Examples include:
LTHW heating distribution
Mechanical services pipework
Pump and plant room equipment connections
Fabricated flanged pipe headers
Supply Support
Heavy weld fittings and common flange sizes are held in stock for routine fabrication work, with larger sizes and specialist components supplied to order.
Carbon steel butt weld fittings including elbows, tees, reducers, and caps
Heavy branch fittings including reducing outlets and branch connections
Steel flanges including slip-on weld, screwed, and blank flanges
Flange sealing and bolting sets including gaskets, stud bolts, nuts, and washers
Typical sizes / options
BS1965 heavy weld fittings (EN 10253-2) 1/2″ – 6″ from stock
Larger weld fitting sizes supplied to order
Slip-on weld flanges 1/2″ – 6″ PN16/5 from stock
Screwed flanges 1/2″ – 4″ PN16/4 from stock
Blank flanges 2″ – 4″ PN16/8 and slip-on PN6/5 available from stock
Specs / standards
Heavy weld fittings manufactured to BS 1965 / EN 10253-2
Carbon steel materials including P235GH
Flanges manufactured to BS EN 1092-1 pressure rating standards
Flange bolting assemblies supplied to suit selected flange specification
Availability & warranty
Heavy weld fittings and common flange sizes are held in stock for routine fabrication work, with larger sizes and specialist components supplied to order.
Warranty: Warranty terms follow the relevant manufacturer specification and installation conditions.
Mechanical Couplers and Flange Adaptors
We supply mechanical couplers and flange adaptors for steel services where mechanical joining is preferred to welded tie-ins for sectional connections. They are typically used where existing steel mains need compatible branch and equipment interface connections.
Applications
Examples include:
Flanged service headers
Pump set connection lines
Mechanical services pipework
Compressed air distribution
Supply Support
Core lines held in stock, extended options sourced with confirmed lead times.
