Flowserve BK 37 User Manual
GESTRA Steam Systems
BK 37
BK 28
BK 29
Installation Instructions 818689-00
Steam Trap
BK 37, BK 28, BK 29
BK 37 ASME, BK 28 ASME, BK 29 ASME
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Contents
Page
Important Notes
Usage for the intended purpose ..............................................................................................................4
Safety note .............................................................................................................................................4
Danger ...................................................................................................................................................4
Attention ................................................................................................................................................4
PED (Pressure Equipment Directive) .......................................................................................................4
ATEX (Atmosphère Explosible) ................................................................................................................4
Explanatory Notes
Scope of supply ...................................................................................................................................... 5
Description .............................................................................................................................................5
Function .................................................................................................................................................5
Technical Data
Corrosion resistance ............................................................................................................................... 6
Sizing .....................................................................................................................................................6
Name plate / marking .............................................................................................................................6
Design
Component parts BK 37, BK 37 ASME .................................................................................................... 7
Component parts BK 28, BK 28 ASME, BK 29, BK 29 ASME ....................................................................8
Key ......................................................................................................................................................... 9
Installation
BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME .............................................................. 10
Flanged design .....................................................................................................................................10
Socket-weld design .............................................................................................................................. 10
Butt-weld design ..................................................................................................................................11
Attention ...............................................................................................................................................11
Heat treatment of welds .......................................................................................................................11
Tools ....................................................................................................................................................11
Commissioning
BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME .............................................................. 12
Attention ..............................................................................................................................................12
Operation
BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME .............................................................. 12
Thermovit regulator ..............................................................................................................................12
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Contents – continued –
Page
Maintenance
Replacing regulator .............................................................................................................................. 13
Tools ....................................................................................................................................................13
Torques required for tightening .............................................................................................................13
Spare Parts
BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME ............................................................. 14
Spare parts list ....................................................................................................................................14
Decommissioning
Danger ................................................................................................................................................14
Disposal ...............................................................................................................................................14
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Important Notes
Usage for the intended purpose
Use steam traps BK 37..., BK 28... and BK 29... only for the discharge of condensed water or for
air-venting in steam lines within the admissible pressure/temperature ratings. Check the corrosion
resistance and chemical suitability of this pressure equipment for the application in question.
Safety note
The equipment must only be installed and commissioned by qualified staff.
Maintenance and service work must only be performed by adequately trained persons who have a
recognised level of competence.
Danger
The steam trap is under pressure during operation.
When loosening flanged connections, sealing plugs or the regulator, hot water and/or
steam may escape. This presents the risk of severe scalding.
Installation and maintenance work should only be carried out when the system is
depressurized (0 bar): isolate the trap from both upstream and downstream pressure.
The trap becomes hot during operation. This presents the danger of severe burns to
hands and arms. Installation and maintenance work should only be carried out when the
system is cold (20°C).
Sharp edges on internal parts present a danger of cuts to hands. Always wear industrial
gloves when replacing the regulator.
Attention
The name plate indicates the technical specification of the equipment.
Do not commission or operate a steam trap without name plate.
PED (Pressure Equipment Directive)
The equipment fulfills the requirements of the Pressure Equipment Directive PED 97/23/EC.
For applications with fluids of group 2. With CE marking (apart from equipment according to
section 3.3).
ATEX (Atmosphère Explosible)
The equipment does not have its own potential source of ignition and is therefore not subject to the
ATEX Directive 94/9/EC. The equipment can be used in potentially explosive areas 0, 1, 2, 20, 21, 22
(1999/92/EC). The equipment is not Ex marked.
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Explanatory Notes
Scope of Supply
BK 37:
1 Steam trap type BK 37
1 Installation manual
BK 28:
1 Steam trap type BK 28
1 Installation manual
BK 29:
1 Steam trap type BK 29
1 Installation manual
Description
Thermostatic/ thermodynamic steam trap with corrosion-resistant Thermovit Duo s.s. regulator
unaffected by waterhammer. The trap features:
n Integral strainer
n Non-return valve action
n Asbestos-free cover gasket (graphite/CrNi)
n Installation in any position
The factory setting enables the steam trap to discharge condensate with virtually no banking-up.
Function
During start-up of the plant the Duo stainless steel plates are flat. The service pressure acts in the
opening direction, the valve is completely open. As the condensate temperature rises, the plates
deflect, drawing the stage nozzle towards the closed position. As the condensate temperature sinks,
the deflection of the Duo stainless steel plates decreases and the steam trap opens at the adjusted
opening temperature.
The thermostatic and spring characteristics of the stack of plates are balanced such that condensate is
always discharged at a given undercooling temperature.
The trap provides automatic air-venting at start-up and during operation. BK 37..., BK 28... and BK 29...
can also be used for thermal air-venting in steam systems.
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