Back pressure flap ProFlapII and ProFlapPlusII for ...

ProFlapII and ProFlapPlusII

Back pressure flap ProFlapII and ProFlapPlusII
for explosion decoupling

The Task Numerous processes can create ex- decoupled from containers to be pro-
plosive dust/air mixtures inside in- tected so that no flames and explo-
dustrial systems (eg., dust collectors, sion pressure can be transferred into fan
mixing machines, fluid bed granula- other areas. explosion pressure
tor, mills, etc.). If ignition sources relief
cannot be prevented due to process Sample application of an exhaust
conditions, these systems are often system that is equipped with explo-
equipped with constructive explosion sion pressure relief:
preventive measures such as pres-
sure relief or pressure suppression. In mounting distance
this regard, connected ductworks are

capturing back pressure flap
separator

The Solution Keller Lufttechnik developed the back
pressure flap series ProFlap for an ef-
fective explosion decoupling for near-
ly all industrial sectors. The
ProFlap is certified as a protective
system according to EU Guideline
94/9/EG (ATEX 95) and is approved
for decoupling of dust explosions of
organic and mineral dusts.

ProFlapPlusII

Operation

Normal operation During operation, the downstream
mounted back pressure flap is kept
open by means of the air flow. When
fully stopped, the flap closes by
its own weight. When the system
starts up, the opening of the flap is
restrained by a damping element

In the event of an During an explosion inside a protect- The downstream mounted back pressure flap is kept open by means of the air flow
explosion ed system, the flap is closed by the On an explosion within a protected system the flap closes due to the pressure front
pressure surge inside the ductwork.
The explosion flame and the pressure spreading within the ductwork
cannot strike back the ductwork. Per-
sonnel working at capturing points or
downstream system parts are pro-
tected against the explosion effects.
The flap damping element prevents
the flap from opening following an
explosion because of decreased pres-
sure.

Monitoring function of To increase inspection intervals,
ProFlapPlus (optional) the optional monitoring device
“ProFlapPlus” is available (patented).
An integrated wear sensor and a sen-
sor to monitor the flap position con-
trol the wear of the flap and the clos-
ing operation.

The sensors are completely wired Wear sensor Accumulation sensor
inside a control cabinet which is
mounted at the return valve. An anal-
ysis of the signals is carried out at the
electrical cabinet which is provided
by the customer. Alternatively, it is
possible to purchase a separate
electrical cabinet (see „accessories“).

ProFlapPlusII

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Scope of applications downstream explosion decoupling of • for varnish dusts etc.
dry dust separators • for blasting plants
• when grinding fiberglass reinforced
Explosion decoupling for dryers, air
components separators, mills, silos, fluid bed granu-
• for chemical and pharmaceutical lators, etc. Applications also possible
for dust concentrations exceeding the
industries lower explosion limits.
• for timber industry

Advantages • c ertified according to the latest system control and greater distances are minimum dimen-
Simulation systems test standard CEN/TC 305/WG 3 inspection intervals sions)
N457 (Stand: 05/2012) • easy access using fasteners, • application feasible for dust
without loose components concentrations beyond the lower
• a pplicable for organic and mineral • ease of access for inspection with explosion limits (specified distances
dusts swiveling flap must be strictly adhered to)
• integrated consoles for easy
• p assive system, no triggering assembly
sensors required • v ariable mounting distances (for
suction ducts, the referenced
• inexpensive in comparison to other
decoupling systems

• m odular monitoring package for

When developing the monitoring sen-
sors, up-to-date air flow simulation
systems were used in order to deter-
mine ideal positioning of the sensors.

directly advancing flow flow advancing from below

advancing flow from above laterally advancing flow

CFD Proflap NS315 Effect of impacting particles on
simulation parameters: sheet metal (indication of abra-
velocity of oncoming flow : 20 m/s sion):
particle mass flow (silica): 5,7 g/s blue: no abrasion
particle size distibution (silica): red: increased abrasion
10µm up to 500µm

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Sizes, technical data

Type Nominal Length L Width B Height H Height S Weight Pressure Max. ope-

width loss on 20 ning angle

m/s of the flap

NW mm mm mm mm kg Pa

ProFlapII_140 140 420 380 430 390 27 380 20°
ProFlapII_160 160 490 455 462 420 31 approx. 400 20°

ProFlapII_200 200 530 490 505 460 38 approx. 400 20°
ProFlapII_250 250 590 540 530 480 46 320 20°
ProFlapII_280 280 630 570 552 520 50 390 20°
ProFlapII_315 315 670 590 590 540 54 330 20°
ProFlapII_355 355 750 610 642 590 82 360 30°
ProFlapII_400 400 750 670 695 645 92 330 30°
ProFlapII_450 450 820 730 730 700 99 420 30°
ProFlapII_500 500 870 800 795 760 118 450 30°
ProFlapII_560 560 930 840 846 820 152 approx. 450 30°
approx. 500 30°
ProFlapII_630 630 1090 1050 970 880 220 approx. 500 30°
approx. 500 30°
ProFlapII_710 710 1190 1150 1060 950 260 approx. 500 30°
approx. 500 30°
ProFlapII_800 800 1320 1230 1190 1060 305

ProFlapII_900 900 1470 1360 1295 1190 360

ProFlapII_1000 1000 1625 1450 1400 1310 420

Mounting position: horizontal, on the suction side (fan behind ProFlapII)
Air flow velocity: 15 – 30 m/s
Temperatures: -10 to + 60°C
Materials: housing: S235JRG2, flap: stainless steel
Paint finish: RAL 3000 “blazing red”

Scale drawing ProFlapII

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Possible dust Max. KST- Max. reduced Pressure Min. installa- Min. installa- Max. installa- Max. installa-
explosion value excess pres- surge resist- tion distance tion distance tion distance tion distance
category s­ ure (pred, max) ance of back at St1 at St2 at St1 at St2
in the con­- pressure flap
St1 and St2 bar x m/s tainer filter)* m m m m
St1 and St2 bar 2,6 3,6 6,6 7
300 bar 2 3,5 7 7,5
St1 and St2 300 1,5 2 3,5 7 7,5
St1 and St2 0,7 0,95 2 3,5 7 7,5
St1 and St2 300 0,7 2 3,5 7 7,5
St1 and St2 300 0,95 2 3,5 7 7,5
St1 300 0,7 0,95 2,6 Not allowed 6,6 Not allowed
St1 300 0,7 0,95 2,6 Not allowed 6,6 Not allowed
St1 200 0,7 0,95 2,6 Not allowed 6,6 Not allowed
St1 200 0,7 0,6 2,6 Not allowed 6,6 Not allowed
St1 200 0,5 0,6 2,6 Not allowed 6,6 Not allowed
St1 200 0,5 0,6 3 Not allowed 7 Not allowed
St1 200 0,5 0,6 3 Not allowed 7 Not allowed
St1 200 0,5 0,6 3 Not allowed 7 Not allowed
St1 200 0,5 0,6 3 Not allowed 7 Not allowed
St1 200 0,6 3 Not allowed 7 Not allowed
200 0,5 0,6
200 0,5 0,6
0,5 0,6
0,5
0,5

Subject to modifications.
* The ductwork between ProFlapII and explosion protected housing/filter shall have the same

max. reduced Pred, max (normally at least 2 mm sheet thickness, welded).

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Accessories and guidelines

Accessories A separate electrical control cabinet
is available with integrated switch
amplifier for the wear sensor.

Guidelines and Back pressure flaps are subject to a therefore permissible to return the
Standards design check according to EU Guide- back pressure flaps into circulation as
line 94/9/EC (ATEX 95), latest stand- independent protection systems.
ard applicable. Quality assurance is
audited according to 94/9/EC (ATEX
95) and is regularly controlled. It is

Reference installations
– examples

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ProFlapII and ProFlapPlusII 11/2012

Keller USA, Inc. © Keller Lufttechnik - all rights reserved. Subject to modifications.
2168 Carolina Place Drive
FORT MILL, SC 29708
Phone: +1 8033962000
Fax: +1 8033962905
[email protected]
www.kellerusa.com