Technical Solution for Over-limit Alarm and Interlock Shut-off at the End of the Gas Main

Technical Solution for Over-limit Alarm and Linkage Shut-off of Gas Main End Pressure

(According to Emergency Management Department Order No. 10)
— Based on Beijing Hengtaishi Instrument Co., Ltd. QD7 Series Equipment

I. Project Background and Regulatory Requirements

1. Mandatory Regulatory Clauses

According to (Emergency Management Department Order No. 10):

① "If an industrial and trade enterprise's gas pipeline system does not have an end pressure monitoring and over-limit alarm device, which may lead to pressure loss of control and cause leaks or other accidents, it shall be identified as a major accident."

② Enterprises that fail to install pressure over-limit alarm devices as required by regulations will face risks such as rectification within a time limit, administrative penalties, or suspension of production and business.

2. Risks and Necessity

Abnormal gas main end pressure (overpressure/underpressure) is directly related to major safety accidents:

Overpressure: Pipeline rupture → Gas leakage → Risk;

Underpressure: Incomplete combustion → CO poisoning, flashback;

Traditional manual inspections cannot monitor in real-time. The QD7 pressure linkage shut-off alarm device enables automated monitoring and emergency response.

II. Solution Design Objectives

1.Compliance Objective

Meet the mandatory requirements for gas pressure monitoring under Emergency Management Department Order No. 10, eliminating major accidents.

2. Technical Objectives

Real-time pressure monitoring with accuracy ≤ ±0.5% FS, alarm response ≤ 2 seconds;

Automatically shut off gas supply when limits are exceeded, while simultaneously pushing alarm information to responsible personnel.

III. Core Equipment: QD7 Pressure Linkage Shut-off Alarm Device

1. Product Overview

An integrated intelligent device designed specifically for gas safety by Beijing Hengtaishi Instrument Co., Ltd. It combines pressure monitoring, alarm, and linkage shut-off functions, meeting the explosion-proof and corrosion-resistant environmental needs of industrial and trade enterprises.

2. Technical Parameters and Advantages

3. Functional Highlights

Intelligent linkage shut-off: Automatically closes gas valve when pressure exceeds limits, avoiding delays in manual intervention;

Multi-level alarm thresholds: Supports hierarchical management of pre-alarm (maintenance reminder) and emergency alarm (triggering shut-off);

Industrial-grade protection: IP67 protection rating, operates in a wide temperature range of -40℃~85℃, suitable for harsh working conditions;

Zero false alarm design: Uses digital filtering algorithms to avoid false triggers from instantaneous pressure fluctuations.

IV. System Design and Implementation

System Architecture Diagram

[Gas Main End] → [QD7 Pressure Transmitter] → [QD7 Controller] → [Sound and Light Alarm]  

↓  

[Emergency Shut-off Valve]  

↓  

[Enterprise Monitoring Platform/Mobile APP]  

Installation Plan

Installation location: At the main end, ≤2 meters from the gas-using equipment, installed vertically to avoid medium deposition;

Construction process:

1. Shut off gas and depressurize → 2. Weld flange/thread install QD7 transmitter → 3. Connect shut-off valve and controller → 4. Pressure calibration → 5. Linkage function test.

Compliance Acceptance

Provide explosion-proof certification (Ex), metrological verification certificate (CMA), and other documents;

Sign the "Safety Acceptance Report" to ensure compliance with Emergency Management Department Order No. 10.

V. Budget and Implementation Timeline

Equipment List

Implementation Timeline

Equipment delivery: 3 working days (in stock);

Construction and acceptance: 1 day (requires enterprise cooperation for 4-hour gas shutdown).

VI. Customer Value

Risk Avoidance

Quickly pass inspections by the emergency management department, avoiding legal risks such as fines and production suspension.

Safety Improvement

Automatically cuts off gas source during pressure abnormalities, reducing accident probability by >95% (referencing application data from a chemical enterprise).

Cost Optimization

Integrated design reduces installation and maintenance costs by 50%, with free replacement of faulty parts during the warranty period.

VII. Appendix

Relevant Clauses of Emergency Management Department Order No. 10 (with original text screenshot)

QD7 Product Qualifications: Explosion-proof certification, metrological certificate, test report;

Beijing Hengtaishi Instrument Co., Ltd. Commitment

7×24-hour technical support, on-site fault response within 2 hours;

Free training on "Gas Pressure Safety Management Operation Guide";

10% discount available for replacement of old equipment.

"QD7 is the 'compliance pass' for Emergency Management Department Order No. 10—a one-time investment to permanently avoid penalty risks!"

"The overpressure automatic shut-off function provides an extra layer of security compared to traditional alarms, truly achieving intrinsic safety!"

"We have provided solutions for 30+ industrial and trade enterprises, with industry-leading equipment stability and after-sales response speed!"