Flame arresters

Description

Flame arrestors and flame filters are used as fire-fighting equipment on vertical tanks for storage of explosive petroleum products.

This equipment is the first stage of fire safety, which helps to protect the tanks and stored product from explosion and fire. The main purpose of flame arrestors and flame filters is to prevent sparks or flames from entering the gas space of the tank and reduce fire hazard.

Principle of action of flame arrestors and filters

Their work is based on heat absorption from a spark or flame: the cassettes of different materials included in the design bring down the temperature below the fire point of oil products. This does not arrest the operating product through the cassette.

Fire-stop assemblies (cassettes, tapes) can be made of foil, copper or aluminum alloys.

Flame arrestors and filters mounting

They are mounted on the roof of the vertical tanks under the breathing or safety valve and bolted to the counter flanges through the tightening. To protect the pipelines under pressure up to 1.6 MPa, they are installed at the site of a possible steam-and-gas mixture outlet.

Types of flame arrestors and flame filters

• flame arrestor OP-AA
• flame arrestor OP-AAN
• flame arrestor PP
• flame liquid filter POZH
• flame communication filter POK

Flame arrestors OP

Flame arrestors OP-AA and OP-AAN protect the gas space of the tank against flame penetration. The fire-stop element, located in the body, consists of corrugated and flat ribbons, which restrain heat from the fire and extinguish it. They are manufactured of aluminium. The OP-AAN flame arrestor is split, which allows cassette inspection and its replacement if necessary.

Flame arrestor OP-AA	Criteria	OP-50АА	OP-80АА	OP-100АА
	Diameter nominal DN	50	80	100
	Throughout capacity at airflow resistance118 PA, m3/h	25	60	100
	Height, Н, mm	80	80	94
	Diameter, D, mm	140	194	207
	Fixing hole diameter, mm	14	18	18
	Number of fixing holes	4	4	4
	Survival time, min.,min	10
	Weight, kg, max	1,3	2,62	3,6

Flame arrestor OP-AAN	Criteria		OP 50AAN	OP 80AAN	OP 100AAN	OP 150AAN	OP 200AAN	OP 250AAN	OP 300AAN	OP 350AAN	OP 500AAN
	Diameter nominal DN		50	80	100	150	200	250	300	350	500
	Throughout capacity at airflow resistance118 PA, m3/h		100	150	200	215	380	600	750	900	2200
	Height, H, mm		172	200	197	231	255	243	275	419	317
	Diameter, Dн, mm		160	214	230	303	375	450	530	610	858
	Connection size, mm	D D1 d n, шт	141 110 14 4	184 150 17 4	205 170 17 4	262 225 18 4	315 280 18 4	370 335 18 6	435 395 22 6	485 445 22 6	644 600 22 16
	Survival time, min.,min		10
	Weight, kg, max		3	5	6,1	10	16	27	30	45	74

Flame arrestors PP

Flame arrestor PP is temporary device, which prevents the flame penetration to the gas space of the tank. It is attached by flanges to the mount nozzle; there is a tightening between the flange and the body that ensures interface integrity.

The fire-stop element is made of flat or corrugated ribbon and can be manufactured of aluminum or stainless steel. The specified life of flame arresters PP of aluminum alloys is 5 years, of stainless steel - 10 years.

Flame arrestor PP	Criteria	PP-50 АА	PP-100 АА	PP-500 АА
	Diameter nominal DN, mm	50	100	500
	Throughout capacity, m3/h	25	100	2200
	Length (D), mm	92	148	910
	Height (L), mm	80		423
	Weight, kg	1.3	1.5	93

Flame liquid filters POZH

Flame liquid filters are used to prevent possible ignition of the tank for diesel fuel or gasoline storage, which can occur at the gas or steam outlet. They can be placed in cast-iron or aluminum housing. The fire-stop element is made of aluminum strips that accumulate the heat of the flame and extinguish it.

They are installation on the receiver pipe.

Flame liquid filter POZH	Criteria	POZH–80
	Diameter nominal DN	80
	Pressure, MPa	0,25
	Throughout capacity at airflow resistance118 PA, m³/h	80 – 100
	Height (H), mm	94
	Diameter (D), mm	207
	Fixing hole diameter, mm	18
	Number of fixing holes	4
	Bolt circle diameter	170
	Weight, kg	3.6
	Survival time, min.,min	10
	Specified life, years	8

Flame communication filters POK

Flame communication filters are installed on crude oil line to prevent the flame from moving through it. The maximum pressure in the pipeline is up to 1.6 MPa.

Their design is more reinforced, as the movement of the operating product occurs at high speed and at high pressure. Having a minimum hydraulic resistance, the liquid passes freely.

The fire-stop element has high heat resistance and fire resistance. When the flame passes through the flame-extinguishing element, the temperature drops below the flash-point of the inflammable liquid. Due to this, there is a flame extinction.

Flame communication filters POK are manufactured in climatic categories N and NF and placement category 1.

Flame communication filter POK	Criteria		POK-50	POK-80	POK-100	POK-150	POK-200	POK-250	POK-300	POK- 350	POK- 500
	Diameter nominal DN		50	80	100	150	200	250	300	350	500
	Throughout capacity at airflow resistance118 PA, m3/h		25	75	100	215	380	600	300	900	2950
	Overall dimensions, mm	DH	215	245	280	335	460	520	600	710	840
		H	300	303	380	430	490	495	575	737	820
	Connection size, mm	D	160	195	215	280	335	405	460	520	710
		D1	125	160	180	240	295	355	410	470	650
		d	18	18	18	22	22	26	30	26	33
		n	4	8	8	8	12	12	12	16	20
	Weight, kg, max		20	28	39	55	113	145	245	290	545