Flowserve UNA 38 User Manual
GESTRA
GESTRA Steam Systems
UNA 38
UNA 39
Installation Instructions 818603-00
Steam Traps
UNA 38, UNA 39
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 – 6
Technical Data
UNA 38, UNA 39 ......................................................................................................................................6
Pressure/temperature ratings .................................................................................................................6
Corrosion resistance ............................................................................................................................... 6
Sizing .....................................................................................................................................................6
Name plate/marking ...............................................................................................................................7
Design
UNA 38, UNA 39 ..............................................................................................................................8 – 10
Key .......................................................................................................................................................11
Installation
UNA 38, UNA 39 ....................................................................................................................................12
Design with flanges .............................................................................................................................. 12
Design with socket-weld ends .............................................................................................................. 12
Design with butt-weld ends .................................................................................................................. 12
Attention ...............................................................................................................................................12
Heat treatment of welds........................................................................................................................13
Hand vent valve (UNA 38)......................................................................................................................13
Float lifting lever (optional extra) ........................................................................................................... 13
Tools .....................................................................................................................................................13
Commissioning
Danger .................................................................................................................................................13
UNA 38, UNA 39 ...................................................................................................................................13
2
Contents – continued –
Page
Operation
Danger .................................................................................................................................................14
Hand vent valve .................................................................................................................................... 14
Float lifting lever ................................................................................................................................... 14
Maintenance
Checking the steam trap .......................................................................................................................15
Cleaning /exchanging the control unit ....................................................................................................15
Changing the bimetallic air vent (UNA 38) ............................................................................................. 15
Torques ................................................................................................................................................ 16
Tools .....................................................................................................................................................16
Retrofitting
Cleaning /exchanging the control unit ....................................................................................................17
Torques ................................................................................................................................................ 17
Tools .....................................................................................................................................................17
Spare Parts
Spare parts list UNA 38, UNA 39 ........................................................................................................... 18
Annex
Declaration of conformity ......................................................................................................................19
3
Important Notes
Usage for the intended purpose
UNA 38, UNA 39:
Use the steam traps only for the discharge of condensed steam and liquids. Use the equipment for
the discharge of condensed steam and other condensable gases in pipes only within the specified
pressure and temperature ratings, and check the corrosion resistance and chemical suitability 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 recognized level of competence.
Danger
The steam trap is under pressure during operation.
When loosening flanged connections, sealing plugs or the control unit, it is possible
that hot water, steam, corrosive liquids or toxic gases may escape.
This presents the danger of severe burns and scalds to the whole body or severe cases
of poisoning by toxic gases.
Installation and maintenance work should only be carried out when the system is
depressurized.
Isolate the trap from both upstream and downstream pressure.
The steam trap becomes hot during operation.
This presents the risk of severe burns to the whole body.
Before performing maintenance work on the valve or flanged connections or undoing
the gland packing screws or sealing plugs, ensure that all the connected pipes are
pressureless (0 bar) and have cooled down to room temperature (20 °C).
Attention
The name plate indicates the technical specification of the equipment.
Do not commission or operate a steam trap without a name plate.
PED (Pressure Equipment Directive)
The equipment fulfils the requirements of the Pressure Equipment Directive PED 97/23/EC.
UNA 38 and UNA 39 are intended for applications with fluids of group 1 and 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
UNA 38 with DUPLEX control unit
loat trap UNA 38
1 F
1 Installation manual
UNA 39 with DUPLEX control unit
1 Foat trap UNA 39
1 Installation manual
Retrofit set for UNA 38, UNA 39
1 Control unit as per specification
1 Installation manual
Spare parts
1 Set according to spare parts list on page 18
Description
UNA 3... are high-pressure steam traps with ball float and needle closing mechanism. The steam traps
work independently of back pressure, thus ensuring universal application.
The steam trap UNA 3… features a body with bolted cover and a control unit. Various control units
are available.
Level-dependent SIMPLEX control is particularly suitable for cold condensate and superheated steam.
Temperature-dependent DUPLEX control offers automatic deaeration by means of a bimetallic air vent
for saturated and superheated steam systems.
The orifice type O 80 MAX (UNA 38) is a control unit for large flowrates and high pressures, and can
be supplied as a SIMPLEX or DUPLEX version.
The orifice type O 140 MAX (UNA 39) is a SIMPLEX control unit for large flowrates and high pressures.
UNA 38 with SIMPLEX control unit
1 Float trap UNA 38
1 Hand vent valve with gasket, installed
1 Float lifting lever with gasket, installed (optional)
1 Installation manual
UNA 39 with SIMPLEX control unit
1 Float trap UNA 39
1 Hand vent valve with gasket, installed
1 Float lifting lever with gasket, installed (optional)
1 Installation manual
.
Function
UNA 38, UNA 39:
The ball valve of the control unit is operated by the float as a function of the condensate level in the
trap. The cross-sectional area (CSA) of the orifice (O) dictates the maximum flowrate when the valve is
completely open. The maximum admissible differential pressure of the control unit is a function of the
CSA of the orifice, the density of the fluid to be discharged, and the pressure/temperature ratings of the
body. Different closing units (orifices) are available.
Float traps equipped with DUPLEX control units enable automatic temperature-dependent deaeration
of saturated steam systems during start-up and in continuous operation.
5
Explanatory Notes – continued –
Function – continued –
UNA 38 control unit O 80 MAX and UNA 39 control unit O 140 MAX:
The float ball controls a pilot valve depending on the level of condensate in the trap body. If more
condensate flows through the pilot valve out of the control chamber than follows through a balance
opening, the pressure in the control chamber drops and the bellows of the control chamber is
compressed. The main valve then opens and the condensate is discharged.
The flowing condensate moves the float ball upwards and the pilot valve closes. By means of the vent
hole, the pressure between the control chamber and the interior of the steam trap is evened out, so
that the main valve closes.
The cross-sectional areas of the pilot and main valves are chosen so that only one orifice (O) is needed
for the entire range of differential pressures up to 80 bar (or 140 bar).
Technical Data
UNA 38, UNA 39
Orifices (O)
Type
O 50 50 X
O 64 64 X
O 80 80 X X
O 80 MAX 80 X
O 110 110
O 140 140
O 140 MAX 140
1
) Observe the pressure/temperature ratings!
2
) Inlet pressure minus outlet pressure.
∆PMX [bar] 1)2)
UNA 38 UNA 39
X
X
X
Pressure/temperature ratings
For the pressure and temperature ratings, see the designation on the body or the data given on the
name plate.
Corrosion resistance
When used for its intended purpose, the safe functioning of the steam trap will not be impaired by
corrosion.
Sizing
The trap body must not be subjected to sharp increases in pressure. The sizing and dimensional
allowances for corrosion reflect the latest state of technology.
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