Flowserve UNA 23 User Manual
GESTRA
GESTRA Steam Systems
UNA 23
UNA 25
UNA 26
UNA 27
Installation Instructions 810516-06
Steam Traps
UNA 23, UNA 25, UNA 26, UNA 26h Stainless Steel, UNA 27h
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
Designs .................................................................................................................................................. 5
Technical Specification
UNA 23h/v, UNA 25h/v, UNA 26h/v, UNA 27h .......................................................................................... 6
Pressure / temperature ratings ............................................................................................................... 6
Corrosion resistance .............................................................................................................................. 6
Sizing ..................................................................................................................................................... 6
Name plate /marking ............................................................................................................................. 7
Design
Components ................................................................................................................................... 8 – 10
Key to components .............................................................................................................................. 11
Installation
UNA 23h/v, UNA 25h/v, UNA 26h/v, UNA 27h ........................................................................................12
Design with flanges .............................................................................................................................. 12
Design with screwed sockets ............................................................................................................... 12
Design with socket-weld ends ............................................................................................................. 12
Design with butt-weld ends .................................................................................................................. 12
Attention .............................................................................................................................................. 13
Heat treatment of welds ....................................................................................................................... 13
Hand vent valve.................................................................................................................................... 13
Tools .................................................................................................................................................... 13
Hand vent valve (optional extra)............................................................................................................ 13
Commissioning
UNA 23h/v, UNA 25h/v, UNA 26h/v, UNA 27h ........................................................................................13
2
Contents – continued –
Page
Operation
Hand vent valve.................................................................................................................................... 14
Float lifting lever .................................................................................................................................. 14
Maintenance
Check steam trap ................................................................................................................................. 14
Clean / exchange control unit................................................................................................................ 14
Tools .................................................................................................................................................... 15
Clean / exchange sightglass cover ........................................................................................................ 15
Attention .............................................................................................................................................. 15
Torques................................................................................................................................................ 16
Spare Parts
Spare parts list ............................................................................................................................. 17 – 21
Annex
Declaration of conformity ..................................................................................................................... 22
3
Important Notes
Usage for the intended purpose
UNA 23, UNA 25:
Use the steam traps only for the discharge of condensed steam within the admissible pressure/
temperature ratings.
Contact the factory for specific recommendations concerning the chemical resistance and suitability of
the valve material for the application in question.
UNA 26, UNA 26h Stainless Steel, UNA 27h:
Use the steam traps only for the discharge of condensates, liquids and condensable gases in pipes.
Use the equipment only within the specified pressure and temperature ratings and check 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
recognised level of competence.
Danger
The steam trap is under pressure during operation.
When loosening flanged connections or sealing plugs, 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.
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
hands and arms. Installation and maintenance work should only be carried out at room
temperatures.
Sharp edges on internals present a danger of cuts to hands. Always wear industrial
gloves for installation and maintenance work.
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. UNA 23
and UNA 25 for applications with fluids of group 2; UNA 26, UNA 26h stainless steel and UNA 27h 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 23h/v, UNA 25h/v, UNA26h/v,
UNA 26h stainless steel, UNA 27h
1 Steam trap UNA 2..
1 Installation manual
Description
UNA 2.. are ball float traps with rolling ball closing mechanisms.
The steam traps work independently of back pressure, thus ensuring universal application.
The steam trap UNA features a body with bolted cover and a control unit. Two different control units are
available: Level-dependent SIMPLEX control for cold condensate and superheated steam, and
temperature-dependent DUPLEX control with automatic deaeration for saturated steam systems.
Optional item: sightglass cover with integral water-level gauge glass (UNA 23, PN 16).
Function
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 dictates the max. flowrate when the valve is
completely open. The max. admissible differential pressure of the control unit is a function of the CSA
of the orifice and the density of the fluid to be discharged. There are different closing units (orifices)
available which can also be exchanged subsequently. Float traps equipped with control units DUPLEX
enable automatic temperature-dependent deaeration of saturated steam systems during start-up and
in continuous operation.
UNA 2. . with Simplex control
1 Steam trap UNA 2..
1 Hand vent valve with gasket
1 Installation manual
UNA 2 .. with float lifting lever
1 Steam trap UNA 2..
Float lifting lever installed
1 Lever extension
1 Installation manual
Design
UNA 23h, UNA 25h, UNA 26h, UNA 26h stainless steel:
for installation in horizontal pipes
UNA 23v, UNA 25v, UNA 26v:
for installation in vertical pipes
UNA 23h, UNA 23v:
with sightglass cover (integrated reflexion water level indicator)
5
Technical Data
UNA 23h/v, UNA 25h/v, UNA 26h/v, UNA 27h
Orifices (O)
(Seat design)
O 2 2 ●●
O 4 4 ●●
O 8 8 ●●
O 13 13 ●●
O 16 16 ●
O 22 22 ●
O 28 28 ●
O 32 32 ●
1
) Observe pressure/temp. specifications.
2
) Inlet pressure minus outlet pressure.
O 45 45 ●
Max. admissible dif-
ferential pressure1)2)
∆∆
∆PMX [bar]
∆∆
UNA 23h/v
UNA 25h/v
UNA 26h/v
UNA 26h stainless steel
UNA 27h
Pressure / Temperature Ratings
UNA 2... without sightglass cover:
For pressure / temperature ratings see indications on trap body or name plate: pressure class
PN / Class, material number, max. temperature, max. pressure, max. differential pressure.
UNA 23h/v: max. admissible temperature: 300 °C
UNA 25h/v: max. admissible temperature: 350 °C
UNA 26h stainless steel: max. admissible temperature: 300 °C
UNA 26h/v: max. admissible temperature: 400 °C
UNA 23h/v with sightglass cover: max. admissible temperature: 240 °C
Reduced temperature limits for sightglass cover with integrated reflexion water level indicator.
If the pH value is above 9.0 and the fluid temperature exceeds 200 °C the glass will get more wear.
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 dimensional allowances for corrosion reflect the latest state of technology.
6
Technical Data – continued –
Name Plate / Marking
For pressure and temperature ratings see indications on trap body or name plate.
According to EN 19 the name plate must specify:
■ Manufacturer
■ Type designation
■ Pressure class PN or Class
■ Material number
■ Max. temperature
■ Stamp on name plate, e.g. specifies the manufacturing year and the quarter,
in this case the 4
th
quarter in 2004.
Fig. 1
4
04
7
Design
Component Parts UNA 23h, UNA 25h, UNA 26h
AB
C
D
Fig. 2
O
N
M
L
K
G
E
F
J
H
F
F
F
I
H
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