Fzt-1 Fire-Retardant Vent Cap Carbon Steel Stainless Steel and Other Materials

• Media: Water
• Standard: Water Vapour Oil
• Certification: CCC, RoHS, ISO, CE
• Temperature: High Temperature
• Connection: Flange
• Valve Seat: Double-Seat
• Model NO.: FZT-1
• Structure: Piston
• Material: Cast Iron
• Transport Package: Wooden Box
• Specification: DN15-DN800
• Trademark: XC
• Origin: China
• Production Capacity: 9999

Product Description

Product Name:	Fire retardant vent cap	Product Model:	FZT-1
Drive mode:	Manual	Product Properties:	Storage tank Accessories
Suitable media:	Light oil products	Sealing materials:	Tef-lon
Pressure range:		Nominal diameter:	DN100, DN150
Commonly used materials:	Aluminium alloy	Technical advice:	021-31007323

First, FZT-1 type fire resistance ventilation cap introduction

The fire retardant vent cap is a safety device used to prevent the hydrogen flame from spreading outwards. It consists of a solid material with many small channels or gaps (fire blocking elements) that can pass through the gas. The gap or channel of the fire blocking element is required to be as small as possible, so when the flame enters the flame arrester, the fire blocking element is divided into many small flame flow, due to the heat transfer effect (the gas is cooled) and the wall effect, the flame flow is quenched.

Specifications	Drawing number	Weight (kg/table)
DN150	GLY-150	7.6
DN100	GLY-100	5.5

FZT-1 type fire retardant ventilation cap

Fire resistance ventilation cap is used in urban industrial and mining enterprises, gas stations, installed in the storage tank (or pump conveyor capacity of not more than 25m2/n light oil water type oil tank) important accessories.




Three, FZT-1 type fire resistance ventilation cap main performance
1, explosion-proof fire resistance breathing valve performance qualified, 13 consecutive explosion resistance performance test can resist fire each time.
2, the fire resistance is qualified, the fire resistance test for 1 hour without tempering phenomenon.
3, shell water pressure test qualified. This product combination, light weight, corrosion resistance. It is easy to repair and install. The flame arrester core is made of stainless steel, which is corrosion-resistant and easy to clean
The following standards are quoted as follows:
GB/T4237-1992 Stainless steel hot rolled steel sheet
GB/T6414-1986 Dimensional tolerances for castings
GB/T9438-1988 Technical specifications for aluminum alloy castings
GB/T9439-1988 gray cast iron
Performance and test method of flame arrester for petroleum storage tank
GB/T1804-1992 General tolerances Unnoted tolerances for linear dimensions
GB/T13306-1991 signage
GB/T13384-1992 General technical conditions for packaging of mechanical and electrical products
JB 78-59 Cast iron flange
SY 532-87 General technical parameters of gray cast iron for oil drilling machinery products
ZB G 33001-85 polytetrafluoroethylene pipe
ZB G 33003-85 polytetrafluoroethylene rod
ZB G 33004-85 Te-flon film

FZT-1 type fire resistance ventilation cap working principle
Most flame arresters are composed of solid materials that can pass through many small, uniform or non-uniform channels or pores of gas, and the requirements for these channels or pores are as small as possible, as long as they can pass through the flame. In this way, the flame enters the flame arrester and is divided into many small streams of flame to be extinguished. The mechanism by which the flame can be extinguished is heat transfer and wall effect.
Heat transfer action
One of the things that can stop a flame from spreading and force it out is heat transfer. We know that the flame arrester is made up of many small channels or pores, and when the flame enters these small channels, many small streams of flame are formed. Because the heat transfer area of the channel or pore is very large, after the flame passes through the channel wall for heat exchange, the temperature drops, and the flame is extinguished to a certain extent. The experiments show that when the thermal conductivity of the flame arrester material is increased by 460 times, its extinction diameter is only changed by 2.6%. This shows that the material problem is minor. That is, heat transfer is one of the reasons for extinguishing the flame, but it is not the main reason. Therefore, for the flame arrester used as an explosion resistance, the choice of material is not too important. However, the mechanical strength and corrosion resistance should be considered when selecting the material.
Wall effect
According to the chain reaction theory of combustion and explosion, it is believed that the combustion explosion phenomenon is not the result of direct interaction between molecules, but under the excitation of external energy (heat energy, radiation energy, electric energy, chemical reaction energy, etc.), the molecule splits into very active and short-lived free radicals. Chemical reactions are carried out by these free radicals. The free radical interacts with another molecule, and as a result, in addition to the product, new free radicals are created. And so the free radicals consume and produce new ones and so on and so forth. It can be seen that the condition for a flammable gas mixture to burn itself (after starting to burn, without the action of external energy sources) is that the newly created free base is equal to or greater than the lost free base. Of course, self-combustion is related to the conditions of the reaction system, such as temperature, pressure, gas concentration, size and material of the container. With the reduction of the size of the flame arrester channel, the collision probability between the free radicals and the reaction molecules is reduced, and the collision probability between the free radicals and the channel wall is increased, so that the free radical reaction is reduced. When the channel size is reduced to a certain value, this wall effect causes the condition that the flame can not continue, and the flame is stopped. It can be seen that the wall effect is the main mechanism of flame retarder. Starting from this point, we can design the flame arrester in the form of well-known structure to meet the needs of industry.