Flame Arresters

Flame arresters prevent the passage of flames in a flammable mixture by acting as a fire barrier. As the flame enters the flamearrester element its temperature is progressively reduced below the auto-ignition temperature of the combustible vapours emitted by the flammable liquid, which are leaving the arrester.

The processes involving storage vessels and associated pipework systems for transportation of explosive gases or vapours need protection from the hazards of ignition due to various sources & further prevention of the spread of the flame to the protected equipment.

The flame arresters are installed at proper locations along the pipelines to prevent the onward passage of the flame & at the vent points of the storage vessels.

The flame arresters are of 2 types:

1. End-of-line	One mounted at the end of pipeline venting directly to the atmosphere. This is used to stop unconfined deflagrations.
2. Inline	One mounted beyond the pressure or vaccum relief valve, or upstream of specified maximum length of pipe venting to the atmosphere.

The flame arrester consists of:

i) Body which houses the flame arresting element is made of cast material (Cast Steel, Cast Iron, Aluminum, Stainless Steel), is provided with flanges or with threaded ends. Stud bolts & proper gasket material is provided as per the application demands.

ii) Flame arresting element is made out of stainless steel. The suitable face area provided to present minimum pressure drop for the normal line flow & quick heat dissipation.

Sizing and selection:

Every proposed arrester application demands careful assessment of the suitability of a particular size and type. The following information should be returned to us :

1.    Analysis of fluids, gas &vapours - % by volume, vapour density (kg/m3)
2.    Tank contents
3.    Chemical formulae
4.    Flash points of the products
5.    Max rate of flow by volume
6.    Max static pressure at the arrester
7.    Max temperature at the arrester
8.    Min temperature at the arrester
9.    Acceptable pressure drop
10. Inline or End-of-line: For inline distance of the arrester from potential source of         ignition with pipework layout drawings
11. Type & size of end connection - flange or threads
12. Body material
13. Storage tank capacity
14. Max fill & empty rates for storage tanks
15. Endurance burning type
16. Special requirements

Flame arresters of following sizes are available:

Sr. No.	Pipe Dia (inch)	NB (mm)	Overall (inch)	Height A (mm)	Overall (inch)	Dia B (mm)
1	1/2	15	7	180	5½	140
2	3/4	20	7	180	5½	140
3	1	25	9	230	7½	190
4	1½	40	10½	268	7¾	196
5	2	50	11½	290	9 1/16	230
6	2½	65	12¼	312	9¼	235
7	3	80	12¼	312	9¼	235
8	4	100	14½	370	12	305
9	6	150	16½	420	16¾	425
10	8	200	21½	548	21	534
11	10	250	30	763	28	711
12	12	300	35	870	33	840
13	14	350	42	1070	36	915

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TAWDE FLAMESAFE PVT. LTD.

Flame Arresters