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Overview
GOST 12836-67 Blind Flanges are manufactured in accordance with the Russian standard GOST 12836-67, specifically designed to close the end of pipelines, valves, or pressure vessel nozzles.
With a solid construction and no central bore, blind flanges provide secure isolation, pressure containment, and long-term sealing performance.
These flanges are widely applied in oil & gas, petrochemical, power generation, district heating, water supply, and industrial pipeline systems, particularly in Russia, CIS countries, and Eastern Europe.
Product Description
A GOST 12836-67 Blind Flange is a solid circular plate with precisely drilled bolt holes that match mating GOST flanges of the same pressure rating.
Standard: GOST 12836-67
Type: Blind Flange (BL)
Nominal Diameter: DN10 – DN1600
Pressure Rating: PN6 / PN10 / PN16 / PN25 / PN40/PN63/PN100/PN160/PN200
| Model Number: | Cost Blind 12836-67 Flange |
| Standard: | Cost 12836-67 |
| Product name: | BLIND Flange |
| Material: | Carbon steel: CT20 Stainless steel: 12X18H10T, 10X17H13M2T |
| Pressure: | PN6, PN10, PN16, PN25, PN40, PN63 |
| Technics: | Forged |
| Connection: | Welding |
| Surface Antirust: | Antirust light oil、 Black paint coating、Yellow paint coating or Red paint coating、Galnavized (Hot galvanized or Cold galvanized or Electro Galvanized) |
| Certificate: | ISO, CE, PED, BV, KS |
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Flange production process
Factory Showcase
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For safe installation and optimal sealing performance, follow these steps:
Check Specifications
Verify DN size, PN40 rating, material grade, and bolt pattern before installation.
Inspect Flange Faces
Ensure both flange faces and sealing surfaces are clean and undamaged.
Select Proper Gasket
Choose a gasket suitable for PN40 pressure and service media
(spiral wound, graphite, PTFE, or metal-reinforced gasket).
Align Bolt Holes
Position the blind flange accurately against the mating flange.
Tighten Bolts Evenly
Use a cross-tightening pattern and apply torque gradually and uniformly.
Pressure Test
Perform hydrostatic or pneumatic testing to confirm leak-free installation.
Tip: Always follow recommended torque values and gasket manufacturer instructions.
FAQ
Q1: What is GOST 12836-67 used for?
It defines the dimensions and requirements for blind flanges used in Russian-standard pressure piping systems.
Q2: Can GOST 12836-67 blind flanges be used permanently?
Yes. They are suitable for both permanent sealing and temporary pipeline isolation.
Q3: Are GOST flanges interchangeable with EN or ANSI flanges?
No. GOST flanges differ in dimensions and bolt patterns and are not directly interchangeable with EN or ANSI standards.
Q4: Which gasket is recommended for GOST blind flanges?
Gasket selection depends on PN rating and service conditions; graphite or metal-reinforced gaskets are recommended for higher pressures.
Q5: Are custom sizes, materials, or markings available?
Yes. Custom materials, coatings, pressure ratings, and project-specific markings can be supplied upon request.
