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VENT-LINE / IN-LINE
CIRCULAR PLATE FLAME ARRESTER
Series No. 4950
The Protectoseal Series No. 4950 Vent-Line / In-Line Flame Arrester is
designed to be installed in open vent pipes or bleed lines from storage
or processing tanks. The arresters are used to prevent the propagation
of an external flame through the vent opening and into the tank. They
provide maximum air-flow consistent with operating efficiency and safety.
Listed by Underwriters' Laboratories (UL) in 1" through 10" sizes. Factory
Mutual (FM) Approved in all sizes.
 The
flame arrester assembly consists of a series of circular, heavy gauge
metal plates assembled onto alignment bolts, threaded into the arrester
cover. Correct, uniform spacing between the plates is assured through
the use of precision embossings and spacers on alternate plates. The arrester
assembly is mounted to the arrester housing, and the gasketed cover joint
insures a vapor tight connection. Arrester assembly elements are removable
and interchangeable. When an element is removed for inspection or maintenance,
a clean spare element can to be inserted to provide positive flame arrester
protection at all times.
When properly mounted in a open vent pipe line, the Series 4950 Flame
Arrester allows vapors to discharge into the atmosphere and allows air
to be drawn into the pipe through the flame arrester grid assembly. If
an external flame source is encountered, the device prohibits passage
of the flame into the tank's vapor space. These
arresters are suitable for use with common flammable vapor mixtures, such
as gasoline and methane (referenced as Group D atmospheres in the National
Electric Code, NEC, Article 500, generally equivalent to International
Electrotechnical Commission, IEC, Group IIA). They may be installed
within specified distances from the end of an open vent pipe. The 1" size
is listed for installation at distances up to 50' from the open end of
the pipe. The 2" size and larger are listed for installation up to 20'
from the open end of the pipe. Standard mounting connections on the 1"
size are NPT threads. Flange connections provided on the 2" through 12"
sizes.
Materials of Construction*
| SERIES |
HOUSING |
FLAME ARRESTER
GRID ASSEMBLY |
| 4950 |
Aluminum 356 |
Aluminum |
| C4950 |
Ductile Iron A536 |
316 S.S. |
| E4950 |
Aluminum 356 |
316 S.S. |
| F4950 |
316 S.S. |
316 S.S. |
*Other exotic metals & coatings available.
| 1"size has standard NPT threaded connection. |
| Flange mating on 2" - 12" sizes |
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Aluminum: |
Mates with 125# FF ANSI |
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Other metals: |
Mates with 150# RF ANSI |
(For more detailed product information, e-mail
us at: info@protectoseal.com.
Be sure to include the product number and your name and address.)
Series No. 30000, Vent-Line/In-Line Crimped Metal
Flame Arresters
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