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



1

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

2

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

3

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.

4

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.

5

Technical Data

Corrosion Resistance

If the steam trap is used for the intended purpose, its safety is not impaired by corrosion.

Sizing

The trap body must not be subjected to pulsating loads.
The dimensional allowances for corrosion reflect the latest state of technology.

Name Plate/Marking

The pressure/temperature ratings are indicated on the trap body / the name plate. For more information
see GESTRA data sheets and Technical Information.

According to EN 19 the name plate and the valve body indicate the type and design:

n Name/logo of the manufacturer
n Type designation
n Pressure class PN or Class
n Material number
n Max. temperature
n Max. pressure
n Flow direction
n Stamp on valve body, e.g. specifies the quarter and the year of production

(Example: 1

st

quarter 2006).

1

06

Fig. 1

6

Size

Nominal pressure

Class

Nominal pressure

Design

Component Parts BK 37, BK 37 ASME

G

I

A

C

D

Fig. 2

H

E

F

G

7

Design – continued –

Component Parts BK 28, BK 28 ASME, BK 29, BK 29 ASME

G

I

A

B

D

Fig. 3

8

H

E

F

G

Design – continued –

Key

A Cover

B Thermovit

C Thermovit

regulator BK 28, BK 28 ASME, BK 29, BK 29 ASME

regulator BK 37, BK 37 ASME

D Strainer

E Gasket

F Body

G Hexagon nut (DIN 2510)

H Expansion bolts (DIN 2510)

I Name plate

9

Installation

BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME

Provided that the flow arrow (the arrow points towards the direction of flow) is taken into consideration,
the trap can be installed in any position. In the case of a horizontal installation make sure that the cover
is on top.

Flanged design

1. Take care of correct position of installation.

2. Take care of flow direction. The flow arrow is on the trap body.

3. Consider space required for opening trap. When the trap is installed a minimum space of

required for removing cover A.

4. Remove plastic plugs. They are only used as transit protection.

5. Clean seating surfaces of both flanges.

6. Install steam trap.

Socket-weld design

1. Take care of correct position of installation.

2. Take care of flow direction. The flow arrow is on the trap body.

3. Consider space required for opening trap. When the trap is installed a minimum space of

required for removing the cover A.

4. Remove plastic plugs. They are only used as transit protection.

5. Remove regulator as described under

6. Clean socket-weld ends.

7. Arc-weld trap (welding process 111 and 141 in accordance with ISO 4063).

Maintenance.

80 mm is

80 mm is

10

Installation – continued –

Butt-weld design

1. Take care of correct position of installation.

2. Take care of flow direction. The flow arrow is on the trap body.

3. Consider space required for opening trap. When the trap is installed a minimum space of

required for removing the cover A.

4. Remove plastic plugs. They are only used as transit protection.

5. Clean butt-weld ends.

6. Arc-weld trap (welding process 111 and 141 in accordance with ISO 4063) or use gas-welding
process (welding process 3 in accordance with ISO 4063).

Attention

n Only qualified welders certified e. g. according to DIN EN 287 may weld the steam trap

into pressurized lines.

n Do not insulate the steam trap.

Heat Treatment of Welds

After welding the steam trap in place a heat treatment of the welds is required (stress-relief annealing
to DIN EN 100529). The heat treatment must be restricted to the immediate area of the welds. Remove
the regulator as described under Maintenance before carrying out the heat treatment.

80 mm is

Tools

n Spanner A. F. 24 mm, DIN 3113, form B

11

Commissioning

BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME

Make sure that the flanged connections of the BK 37..., BK 28... or BK 29... are permanently bolted
and tight.

Attention

The steam trap is under pressure at start-up and during the operation.
The steam trap becomes hot during operation. This presents the risk of severe burns to

hands and arms.
Always wear industrial gloves when setting the regulator.
Installation and maintenance work may only be carried out when the system is

depressurised (zero bar).
Make sure that the lines upstream and downstream of the trap are not under pressure!

Operation

BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME

Please note that maintenance may be required for certain operating modes (see Maintenance).

Thermovit regulator

The factory setting of the Thermovit regulator enables the regulator to be steam-tight when closed and
to open just before the pressure-dependent boiling temperature is reached.

12

Maintenance

GESTRA steam traps type BK 37... BK 28... and BK 29... do not require any special maintenance.
However, if used in new installations which have not been rinsed it may be necessary to check and
clean the trap.

Replacing Regulator

1. Remove cover A from body F, Fig. 2, Fig. 3

2. Remove regulator

3. Unscrew regulator

4. Clean body, regulator, cover and strainer.

5. Clean gasket seating surfaces and insert new gasket

6. Clean sealing surfaces of regulator

7. Replace strainer

8. Screw in regulator

9. Apply heat-resistant lubricant to threads of the expansion bolts

HSC+®)

10. Replace cover

diagonally opposite pairs with a torque of

Tools

n Spanner A. F. 24 mm, DIN 3113, form B
n Torque spanner 20-100 Nm, ISO 6789
n Torque spanner 80-400 Nm, ISO 6789

B or C using a spanner.

B or C and take off strainer D.

E.

B or C and body F.

D.

B or C and tighten with a torque of 100 Nm.

H (use for instance MOLYKOTE

A. Insert expansion bolts H and tighten hexagon nuts G at room temperature in

225 Nm.

Torques required for tightening

Item

B / C

G

All torques are based at 20 °C room temperature.

MOLYKOTE® is a registered trademark of Dow Corning GmbH, Wiesbaden

Designation Torque [Nm]

Thermovit regulator 100

Hexagon nut 60

13

Spare Parts

BK 37, BK 37 ASME, BK 28, BK 28 ASME, BK 29, BK 29 ASME

B/C

D

E

Fig. 4

Spare parts list

Item Designation Stock code

B

C

E
D

Regulator for BK 28..., BK 29..., complete

including cover gasket E

Regulator for BK 37..., complete

including cover gasket E

Gasket (graphite/CrNi) 372095

Strainer 096701

370281

377722

Decommissioning

Danger

Risk of severe burns and scalds to the whole body!
Before loosening flanged connections or sealing plugs, make sure that all connected lines
are depressurized (zero bar) and cooled down to room temperature (20 °C).

Disposal

Dismantle the trap and separate the waste materials, using the specifications in the table “Materials”
on page 9 as a reference.
For the disposal of the trap observe the pertinent legal regulations concerning waste disposal.

14

For your notes

15

Agencies all over the world:

www.gestra.de

GESTRA

España

GESTRA ESPAÑOLA S.A.

Luis Cabrera, 86-88
E-28002 Madrid
Tel. 00 34 91 / 5 15 20 32
Fax 00 34 91 / 4 13 67 47; 5 15 20 36
E-mail: aromero@flowserve.com

Great Britain

Flowserve Flow Control (UK) Ltd.

Burrel Road, Haywards Heath
West Sussex RH 16 1TL
Tel. [phone] / 31 44 00
Fax [phone] / 31 45 57
E-mail: gestraukinfo@flowserve.com

Italia

Flowserve S.p.A.

Flow Control Division
Via Prealpi, 30
l-20032 Cormano (MI)
Tel. 00 39 02 / 66 32 51
Fax 00 39 02 / 66 32 55 60
E-mail: infoitaly@flowserve.com

Polska

GESTRA POLONIA Spolka z.o.o.

Ul. Schuberta 104
PL - 80-172 Gdansk
Tel. 00 48 58 / 3 06 10 -02 od 10
Fax 00 48 58 / 3 06 33 00
E-mail: [e-mail]

Portugal

Flowserve Portuguesa, Lda.

Av. Dr. Antunes Guimarães, 1159
Porto 4100-082
Tel. [phone]
Fax [phone]
E-mail: jtavares@flowserve.com

USA

Flowserve GESTRA U.S.

2341 Ampere Drive
Louisville, KY 40299
Tel.: 00 15 02 / 502 267 2205
Fax: 00 15 02 / 502 266 5397
E-mail: dgoodwin@flowserve.com

GESTRA AG

P. O. Box 10 54 60, D-28054 Bremen
Münchener Str. 77, D-28215 Bremen
Telephone [phone] - 0
Fax [phone] - 393
E-Mail gestra.ag@flowserve.com
Internet www.gestra.de

818689-00/806cm · 2006 GESTRA AG · Bremen · Printed in Germany

16