Flowserve BK 27N User Manual
GESTRA Steam Systems
BK 27N
Installation Instructions 818627-00
Steam Trap
BK 27N, DN 40- 50
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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
Design ....................................................................................................................................................5
Technical Data
Pressure / temperature ratings ...............................................................................................................6
Corrosion resistance ............................................................................................................................... 6
Sizing .....................................................................................................................................................6
Name plate / marking .............................................................................................................................. 6
Design
Component parts BK 27N ........................................................................................................................7
Key .........................................................................................................................................................8
Installation
BK 27N ...................................................................................................................................................9
Flanged design ....................................................................................................................................... 9
Socket-weld design ................................................................................................................................ 9
Butt-weld design ..................................................................................................................................10
Attention ...............................................................................................................................................10
Heat treatment of welds .......................................................................................................................10
Commissioning
BK 27N ................................................................................................................................................11
Attention ..............................................................................................................................................11
Setting the regulator (undercooling, controlled steam flow) .................................................................. 11
Restoring factory settings ....................................................................................................................11
Operation
BK 27N .................................................................................................................................................12
Contents continued
Page
Maintenance
Check steam trap .................................................................................................................................12
Clean / replace bimetallic regulator and strainer .................................................................................... 12
Tools .....................................................................................................................................................12
Torques ................................................................................................................................................ 13
Spare Parts
Spare parts list ....................................................................................................................................13
Annex
Declaration of Conformity ............................................................................................................... 14
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Important Notes
Usage for the intended purpose
Use steam trap BK 27N only for the discharge of condensed water in pipe lines or for air-venting within
the admissible pressure/temperature ratings.
Check the corrosion resistance and chemical suitability of the steam trap 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, 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 or the strainer.
Attention
The name plate specifies the technical features of the equipment. Note that any piece of
equipment without its specific name plate must neither be commissioned nor operated.
PED (Pressure Equipment Directive)
The equipment fulfills the requirements of the PED 97/23/EC. The equipment can be used with fluids
of group 2. With CE marking (except equipment according to section 3.3 of the PED).
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 market.
Explanatory Notes
Scope of supply
BK 27N:
1 Steam trap BK 27N
1 Installation manual
Description
Thermostatic steam trap with corrosion-resistant thermostatic element (Duo stainless steel bimetallic
regulator, externally adjustable) unaffected by waterhammer. With internal Y-type strainer, integrated
non-return valve and asbestos-free cover gasket (graphite). Installation in any position.
The default factory setting allows the steam trap to discharge condensate with virtually no banking-up. For
more undercooling the settings of the installed, depressurized steam trap can be modified externally.
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 27N can also be used for
thermal air-venting in steam systems.
Design
BK 27N:
For installation in horizontal and vertical pipes.
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