Product illustration; final geometry follows the approved drawing.
Confirm the neck bore, weld preparation and mating pipe wall together. Identify the required flange facing on the drawing.
Selection reference: Weld neck flanges / Blind flanges / Plate flanges Product series — GOST 33259 / GOST 12820 / GOST 12821 · Carbon steel / Stainless steel.
The listed values are alternatives within a series, not one combined specification. Identify the required combination.
Selection identifiers: Specified standard: GOST 33259 / GOST 12820 / GOST 12821; Material / grade: Carbon steel / Stainless steel · Q235 / ST20 / 304 / 316; Facing: RF / FF.
Confirm the neck bore, weld preparation and mating pipe wall together. Identify the required flange facing on the drawing.
For a closed pipe end, confirm the mating flange drilling, facing and required thickness. State whether any tapping or opening is required.
Compare the flange bore, plate thickness, bolt circle and facing with the mating connection. Include a dimensioned drawing for nonstandard drilling.
Please confirm before quotation: Size designations.
| Product forms | Weld neck flanges / Blind flanges / Plate flanges |
|---|---|
| Specified standard | GOST 33259 / GOST 12820 / GOST 12821 |
| Material / grade | Carbon steel / Stainless steel · Q235 / ST20 / 304 / 316 |
| Facing | RF / FF |
| Catalogue reference | HC-0231 |
Confirm the material grade, dimensions, pressure class and standard together against the approved drawing before ordering. Schedule denotes wall thickness, not a pressure rating.
Send a bill of materials or drawing with item quantities, material grades, dimensions, standard and edition, inspection documents, packing and destination. Identify any requirements that still need technical review.
Contact our sales teamWeld neck flanges / Blind flanges / Plate flanges Product series — GOST 33259 / GOST 12820 / GOST 12821 · Carbon steel / Stainless steel — Include the material grade, dimensions, applicable standard and quantity.
Specified standard: GOST 33259 / GOST 12820 / GOST 12821; Material / grade: Carbon steel / Stainless steel · Q235 / ST20 / 304 / 316 The applicable standard, mating components and project design conditions must be reviewed together. Size, rating and material combinations are confirmed in the agreed quotation or drawing.
List the material certificates, inspection records and traceability documents required by your project. Their scope and availability must be agreed before ordering.
Include the material grade, dimensions, applicable standard and quantity.
Specify the mating flange, nominal size, drilling pattern and facing together. A matching nominal size alone does not establish interchangeability between different flange standards. For weld neck flanges, include the pipe bore and wall thickness; for threaded designs, identify the thread standard. Select the gasket and bolting as part of the complete joint.
Confirm the neck bore, weld preparation and mating pipe wall together. Identify the required flange facing on the drawing.
Specify the mating flange, nominal size, drilling pattern and facing together. A matching nominal size alone does not establish interchangeability between different flange standards. For weld neck flanges, include the pipe bore and wall thickness; for threaded designs, identify the thread standard. Select the gasket and bolting as part of the complete joint.
Send us your drawings or specifications — our engineers will reply with a competitive quotation within 24 hours.
