| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8424900500 | Doc | 37.5% | CN | US | 2025-05-12 |
| 8468905000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8468901000 | Doc | 57.9% | CN | US | 2025-05-12 |
| 8515904000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 6815110000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 6815994170 | Doc | 55.0% | CN | US | 2025-05-12 |
| 9020006000 | Doc | 32.5% | CN | US | 2025-05-12 |
| 9020009000 | Doc | 32.5% | CN | US | 2025-05-12 |
| 8535400000 | Doc | 57.7% | CN | US | 2025-05-12 |
| 8535904000 | Doc | 57.7% | CN | US | 2025-05-12 |
| 8537109170 | Doc | 57.7% | CN | US | 2025-05-12 |
| 8537109160 | Doc | 57.7% | CN | US | 2025-05-12 |
| 8538908160 | Doc | 58.5% | CN | US | 2025-05-12 |
| 8538903000 | Doc | 58.5% | CN | US | 2025-05-12 |
| 8536304000 | Doc | 55.0% | CN | US | 2025-05-12 |
| 8536308000 | Doc | 55.0% | CN | US | 2025-05-12 |
Flashback Arrestor
A flashback arrestor, also known as a flame arrestor or backfire preventer, is a safety device installed in fuel gas systems to prevent the propagation of a flame back into the fuel supply in the event of a backfire or flashback.
Material:
- Housing: Typically constructed from stainless steel, aluminum, or brass, chosen for their durability and resistance to high temperatures.
- Flame Arresting Element: Commonly made of sintered metal (bronze, stainless steel), crimped metal ribbon, or a perforated plate structure. The material is selected based on the fuel gas being used and the required level of protection.
- Seals: Often utilize high-temperature resistant elastomers like Viton or silicone.
Purpose:
The primary purpose of a flashback arrestor is to protect fuel gas cylinders, regulators, and other downstream components from damage or explosion caused by a flame traveling back through the gas lines. It safeguards personnel by preventing the flame from reaching the gas source.
Function:
A flashback arrestor functions by dissipating the heat of a flame before it can reach an ignitable mixture. The flame arresting element provides a large surface area for heat transfer, cooling the flame below its ignition temperature. This prevents the flame from continuing to propagate backwards. The device typically incorporates a thermal shut-off mechanism that closes a valve to stop the flow of gas in the event of a sustained flashback.
Usage Scenarios:
- Welding and Cutting: Used extensively with oxy-fuel welding and cutting equipment to protect gas cylinders and regulators.
- Industrial Furnaces: Employed in furnaces and other industrial heating applications where flammable gases are used.
- Laboratory Gas Systems: Installed in laboratories to protect gas supplies used for experiments and analysis.
- Gas Distribution Systems: Can be incorporated into gas distribution networks for added safety.
- Propane and Natural Gas Appliances: Used in some appliances as a safety feature.
Common Types:
- Single-Stage Arrestors: Contain a single flame arresting element and are suitable for less demanding applications.
- Double-Stage Arrestors: Feature two flame arresting elements for increased protection, often used in high-risk scenarios.
- Inline Arrestors: Installed directly in the gas line between the regulator and the equipment.
- Torch-Mounted Arrestors: Integrated into the welding or cutting torch handle.
- Thermal Shut-Off Arrestors: Include a valve that automatically closes in the event of a sustained flashback, providing an additional layer of safety.
- Water Seal Arrestors: Use water to create a physical barrier to prevent flashback, commonly used with acetylene.
Based on the provided information, a flashback arrestor falls under the category of apparatus for protecting electrical circuits. Here's a breakdown of relevant HS codes:
- 8536304000: Electrical apparatus for switching or protecting electrical circuits, or for making connections to or in electrical circuits (for example, switches, relays, fuses, surge suppressors, plugs, sockets, lamp-holders and other connectors, junction boxes), for a voltage not exceeding
1,000 V ; connectors for optical fibers, optical fiber bundles or cables: Other apparatus for protecting electrical circuits: Motor overload protectors. This code covers apparatus designed to protect circuits, and a flashback arrestor would fall under this category if it operates at or below 1,000V.- 85: Electrical machinery and equipment.
- 36: Electrical apparatus for switching or protecting electrical circuits.
- 30: Other apparatus for protecting electrical circuits.
- 8536308000: Electrical apparatus for switching or protecting electrical circuits, or for making connections to or in electrical circuits (for example, switches, relays, fuses, surge suppressors, plugs, sockets, lamp-holders and other connectors, junction boxes), for a voltage not exceeding
1,000 V ; connectors for optical fibers, optical fiber bundles or cables: Other apparatus for protecting electrical circuits: Other. This is a broader category for other apparatus used for circuit protection, applicable if the specific type of flashback arrestor isn't explicitly covered elsewhere.- 85: Electrical machinery and equipment.
- 36: Electrical apparatus for switching or protecting electrical circuits.
- 80: Other apparatus for protecting electrical circuits.
According to the provided reference material, the HS code options related to 'flashback arrestor' are limited, with only the following 2 found.
The total tax rate for both HS codes is 55.0%.