Heze Boiler Factory Co., Ltd. _ Shandong He Guo Group

Regular inspections

1. The user unit should apply for periodic inspection with the inspection agency one month prior to the expiration of the regular inspection validity period. The first periodic inspection of storage tanks typically occurs within the first 3 years of operation. Subsequent inspection intervals are determined by the inspection agency based on the safety status level.

2. The user unit and its auxiliary units should conduct technical handling post-shutdown and perform safety checks prior to inspection, ensuring the site conditions meet inspection requirements and preparing the necessary arrangements.

3. During the inspection, the safety personnel, operation, and maintenance staff of the unit shall be present to assist with the inspection, provide relevant documents promptly, oversee safety, and establish reliable communication channels.

Safety Protection

The potential hazards in the operation of liquefied natural gas primarily stem from its physical properties:

Liquefied natural gas (LNG) has an extremely low temperature under atmospheric pressure: -162°C.

The gas-liquid volume ratio is very high; improper pressure-reducing measures can lead to a rapid increase in pressure. The gas-liquid volume ratio of liquefied natural gas is approximately 620:1.

Natural gas is an asphyxiating gas.

Natural gas is a flammable gas (ignition temperature 538°C).

Explosions may occur in confined spaces (explosion limits in air: 5.3% to 15%)

2. When working on-site with natural gas or liquefied natural gas, the following safety knowledge is required:

Keep liquefied natural gas equipment away from flames or electrical sparks.

No smoking or open flame is permitted in areas involved in the maintenance, refueling, and storage of liquefied natural gas equipment.

When working in areas with liquefied natural gas, safety goggles, face shields, and insulated gloves must be worn. Pants should not be tucked into boots, sleeves should not be worn inside insulated gloves, and boots should not have nails on the soles.

When dismantling parts for maintenance, the LNG storage tank must be emptied and depressurized.

Tools used for maintenance should not produce sparks.

Warning

Protect eyes and exposed skin.

Maintain good ventilation in the area where the equipment is located.

Ensure the system is depressurized before repairing or maintaining equipment.

Keep away from flammable materials or electric sparks.

The root valve must be kept open at all times.