Weld Neck Flanges
Designed around a butt-welded hub and commonly used where alignment and a robust pressure connection are important.
Bolted Pressure Connections
Flanges
Flanges create serviceable, bolted joints between pipe, valves and equipment. Flowline organises the selection around flange type, nominal pipe size, pressure class, material, facing and drilling standard so drawings and purchase descriptions stay aligned.
Weld neckSlip-onBlind
Common formsWN, SO, blind and socket weld
PressureClass / table selection
Key dimensionsOD · PCD · holes · thickness
Catalogue referenceANSI B16.5 Class 150 / 300
Technical guide
Build the flange description around the joint.
Flange type, nominal size, class, facing, material and bore are the key anchors for a connection that must line up with the piping class and equipment.
Flowline’s catalogue includes dimensional flange tables as well as forged flange references for ANSI B16.5 Class 150 and Class 300. This makes the flange page a natural place to compare the connection type with pressure class and drilling information.
When requesting a flange, include the flange type, nominal size, class or table, facing, material, bore or schedule requirement and quantity. For replacement work, a drawing, existing flange dimensions or equipment-nozzle details can remove ambiguity.
Weld neckSlip-onBlindSocket weldRaised-face / project-facing requirements
Forged pipe flangesANSI / ASME B16.5
Catalogue classes150 and 300 lb forged flange references
Legacy table drillingTable D / Table E references shown in Flowline catalogue
MaterialsCarbon / stainless / project-specific forging grades
Valve connectionsPump and equipment nozzlesProcess pipingUtility headersMaintenance break pointsSkid and package piping
Within Flanges
Select the flange type before the drilling details.
Weld neck, slip-on, blind and socket-weld forms solve different connection needs. Once the type is clear, pressure class, facing and material complete the description.
Slip-On Flanges
A practical flange form for compatible services, selected by pipe size, pressure class, facing and material.