Haihao Group ensures safe and efficient selection of blind flanges

Haihao Group prides itself on providing comprehensive solutions for the seamless integration of blind plates for various piping systems. This article will introduce to you the classification, selection criteria and strategic layout of blind boards.

Blind Flange Classification and Selection: Blind flanges serve the essential purpose of completely isolating production mediums, preventing any disruptions or accidents that may occur due to inadequate valve closure. Among the common blind flanges used in pipelines are the figure-eight blind flange, spectacle blind, and the use of spacers and blanks (with spacers and blanks serving as blanks alternately).

ANSI B16.5 ASTM A182 F304 blind flange

For situations requiring complete separation, the figure-eight blind flange is recommended, while spectacle blinds are suitable for one-time use scenarios.

Strategic Placement of Blind Flanges:

Pipeline Testing Phases: During the strength or tightness testing phases of pipelines, blind flanges are strategically placed at the connection points between equipment and pipelines to avoid simultaneous testing disruptions.

Connecting External to Internal Zones: In scenarios where various process material pipelines connect from external to internal zones, blind flanges are placed at the shut-off valve locations when the facility is at a standstill.

Multi-Series Facilities: In facilities with multiple series, blind flanges are positioned at shut-off valves for each respective branch pipeline.

Isolation for Maintenance, Inspection, or Switching Operations: When equipment requires complete isolation for maintenance, inspection, or switching operations, blind flanges are installed at shut-off valves.

Pressurized or Gas Replacement Pipelines: Blind flanges are placed at shut-off valves when connecting pressurized pipelines, gas replacement pipelines (e.g., nitrogen, compressed air), and process pipelines with low-point drainage needs to equipment.

Exhaust, Drainage, and Sampling Pipes: For exhaust pipes, drainage pipes, and sampling pipes, blind flanges or threaded plugs are applied after the valve unless the involved materials are non-toxic, non-hazardous, and non-explosive.

Stainless steel SS316 spectacle blind flange

Staged Construction of Facilities: In phased construction scenarios, interconnecting pipelines have blind flanges installed at shut-off valves to facilitate subsequent engineering construction.

Normal Production Situations: Even during normal production phases, auxiliary pipelines requiring complete shutdown are equipped with blind flanges.

Other Process-Specific Requirements: Blind flanges are strategically placed wherever specific process requirements demand their installation.

Blind flanges play a vital role in pipeline systems by ensuring isolation and safety. Choosing the appropriate type of blind flange and strategically placing them based on different processes and requirements is paramount. At Haihao Group, we excel in providing tailored blind flange solutions to meet these critical needs, fostering safety and efficiency within pipeline infrastructures.