QJB-B01.02-2013 arch cover quick opening atmospheric manhole

12.29,20256

Brief Introduction

QBJ-B01.02-2013 is an enterprise standard that specifiesArch cover quick opening atmospheric manholeIt is commonly used as a maintenance channel for storage tanks, containers, and other atmospheric pressure conditions. Its core is a quick opening structure and atmospheric pressure seal, suitable for fields such as food, chemical, pharmaceutical, etc. that require hygiene or convenient maintenance.

1、 Standard Basic Attributes and Core Positioning

project	content
standard type	Enterprise Standard (QBJ is the enterprise code, 2013 is the year of publication)
Applicable working conditions	Normal pressure (design pressure ≤ 0.1MPa), not suitable for pressure vessels
core structure	Arch cover type+quick opening mechanism (such as clamps, locks), balancing sealing and quick opening and closing
main purpose	Personnel entry and exit, equipment maintenance, ventilation, adaptation to atmospheric pressure vessels such as storage tanks and reaction vessels
Typical materials	Carbon steel, stainless steel (304/316L, etc.), suitable for different media corrosion requirements

2、 Key technical parameters (common specifications, subject to enterprise technical documents)

Nominal diameter: commonly DN500, DN600, DN800, suitable for different personnel and maintenance tool entry and exit needs.
Sealing form: mostly flat sealing, equipped with food grade or medium resistant sealing rings (such as silicone, fluororubber) to ensure no leakage under normal pressure.
Quick opening method: common hinge+lock buckle type, single person can quickly open and close, improving operational efficiency.
Design temperature: generally -20 ℃~120 ℃, suitable for conventional working conditions, and can be customized for special working conditions.
Execution requirements: Dimensional tolerances, welding processes, and surface treatments (such as polishing and sandblasting) must comply with the company's internal control indicators and meet hygiene or industrial grade requirements.

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