Brand: GESTRA

GESTRA UNA 45 Ball Float Steam Trap PN 40 DN 15-65

Name: GESTRA UNA 45 Ball Float Steam Trap DN15-65
Brand: GESTRA
SKU: UNA 45

Description

A PN 40 ball float trap with sight-glass and electrode cover options

The GESTRA UNA 45 is a ball float steam trap in six sizes from DN 15 to DN 65 (1/2 to 2 1/2 inch), rated PN 40 and Class 300. It discharges condensate from steam, other gases and gaseous mixtures through a ball float and a rolling-ball sealing unit, and the data sheet states that its operation is unaffected by backpressure. What sets the UNA 45 apart in the range is its cover: besides the standard cover it is offered with a sight-glass cover for watching the condensate level and a cover prepared for GESTRA NRG 16-19 or NRG 16-27 measuring electrodes. The same sheet also covers the UNA 46 (carbon steel cast cover) and UNA 46A (stainless steel).

Technical specifications

Parameter	Specification
Model	UNA 45, PN 40 / Class 300 (siblings on the same data sheet: UNA 46, UNA 46A)
Nominal size	DN 15, 20, 25, 40, 50, 65 (NPS 1/2, 3/4, 1, 1 1/2, 2, 2 1/2)
Materials, UNA 45	Body 1.0460 (SA105); cover, sight-glass cover and electrode cover 5.3103 (A395); body gasket graphite/CrNi
Materials, siblings	UNA 46 cover 1.0619 (SA216-WCB); UNA 46A body 1.4404 (SA182-F316L), cover 1.4408 (SA351-CF8M)
End connections	Flange EN 1092-1 B1 PN 40; flange ASME B16.5 Class 150 or 300 RF; screwed socket G or NPT; socket-weld DIN EN 12760 or ASME B16.11 Class 3000; butt-weld via transition pieces
Orifices	2, 4, 8, 13, 22 and 32; max. differential pressure 2, 4, 8, 13 bar, and per the rating table for orifices 22 and 32
Orifice hole diameter	DN 15-25: 8.0 / 6.0 / 4.8 / 4.1 / 3.5 / 3.0 mm; DN 40-65: 15.0 / 12.5 / 10.0 / 8.5 / 7.0 / 6.5 mm
Pressure rating, PN 40 flange	40 bar g at -10 to 50 °C, reducing with temperature (see the rating tables in the data sheet)
Control units	Duplex (5N2 membrane regulator capsule), Simplex with manual vent valve, or internal bypass adjustable from outside for rotating cylinders
Weight, standard cover	6.8 to 7.8 kg (DN 15-25); 24.8 to 28.6 kg (DN 40-65)
Weight, sight-glass cover	9.7 to 10.7 kg (DN 15-25); 30.5 to 34.3 kg (DN 40-65)
Fluid group (PED)	UNA 45: Group 2; UNA 46 and UNA 46A: Group 1 and Group 2

Options and control unit choices

The data sheet lists a cover without holes, a manual float lifting lever, a manual vent valve on the Duplex unit, a Perbunan rolling ball for DN 15 to 25, an internal strainer, an internal bypass adjustable from the outside, a sight-glass cover rated PN 16 / Class 150 and a Smart ready preparation. Duplex units suit saturated steam, and the manufacturer warns that the capsule must not be exposed to superheated steam above 5 K. Simplex is intended for cold condensate and distillate, and the bypass version for draining rotating cylinders. As with the other UNA traps the body can be rotated between horizontal (hl, hr) and vertical (v) flow after installation.

Selection and installation notes

Match the orifice to the actual differential pressure and the hot-condensate capacity chart in the data sheet. Note that the sight-glass cover has its own lower pressure rating, and the sheet carries notes on glass wear with condensate pH and temperature. For smaller DN 15-25 duties at similar pressure see the

GESTRA UNA 16.

and for very high pressure the

GESTRA UNA 38.

. Other options are listed under steam trap products.

How the GESTRA UNA 45 steam trap works

A steam trap lets condensate out of a steam line and keeps the steam in. Inside the UNA 45 is a hollow ball float. When condensate collects, the float rises and opens the outlet through a rolling-ball sealing unit. When only steam is present, the float sinks and the outlet closes. Because the float follows the condensate level, the trap discharges continuously and is not affected by backpressure.

Where the UNA 45 is used

Steam mains and branch lines
Heat exchangers and heaters
Process equipment using steam
Compressed air and gas lines with condensate
Rotating cylinders with the internal bypass control unit

Selection checklist for the UNA 45

Nominal size from DN 15 to DN 65
Orifice size and the differential pressure
End connection: flange, screwed, socket-weld or butt-weld
Standard, sight-glass or electrode cover
Control unit: Duplex, Simplex or bypass
Pressure and temperature rating
Material of body and cover
Weight and space for installation

Installation, commissioning and maintenance notes for the UNA 45

Fit the trap below the point where condensate collects, with the flow arrow in the right direction. Add a strainer ahead of it to keep dirt out of the orifice. Warm the line slowly to avoid water hammer. Check the trap at regular intervals for blow-through or for a blocked outlet. Use the sight-glass cover when you need to see the condensate level.

Requesting a quotation for the GESTRA UNA 45

Please send the size, the orifice, the end connection, the cover type and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

UNA 45 sizes

The six sizes are DN 15, 20, 25, 40, 50 and 65, or NPS 1/2, 3/4, 1, 1 1/2, 2 and 2 1/2.

UNA 45 materials

The body is 1.0460 (SA105). The cover is 5.3103 (A395). The body gasket is graphite and CrNi.

UNA 45 orifices

The orifices are 2, 4, 8, 13, 22 and 32. The maximum differential pressures are 2, 4, 8 and 13 bar for the first four.

UNA 45 pressure rating

The PN 40 flange is rated at 40 bar g from minus 10 to plus 50 degrees C, and lower at higher temperatures.

UNA 45 control units

The options are a Duplex unit with a membrane capsule, a Simplex unit with a manual vent valve and an internal bypass.

UNA 45 weight

With the standard cover the weight is 6.8 to 7.8 kg for DN 15 to 25 and 24.8 to 28.6 kg for DN 40 to 65.

UNA 45 cover options

The standard cover, the sight-glass cover and the cover for NRG 16-19 or NRG 16-27 electrodes are listed.

Trap records for the UNA 45

Record the tag, the orifice and the date of each inspection.

Choosing the right UNA 45 orifice

Choose the orifice from the differential pressure and the condensate flow of the application.

Documents and quotation

The attached nine-page GESTRA data sheet 819345 contains the full pressure-temperature tables for each end connection, dimensions for every cover type and capacity charts. Send steam pressure, back pressure, condensate rate, end connection standard, cover type and material grade with your enquiry, and confirm the configuration against current manufacturer documents before ordering.

Datasheets & Documents

Datasheet GESTRA UNA 45, UNA 46, UNA 46A ball float steam trap data sheet 819345 Download

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About brand

Steam and condensate equipment has been GESTRA's field since 1902, when the company started in Bremen, Germany. Its steam traps, non-return valves and boiler control electronics are found in boiler houses worldwide. Seven Star LLC lists the GESTRA LRGT 16-1 conductivity transmitter, the NRGT 26-2 level transmitter and UNA series ball float steam traps, and supplies GESTRA boiler control parts, valves and steam trap spares to plants in Oman as an independent supplier.

GESTRA LRGT 16-1 and GESTRA boiler control

The LRGT 16-1 is a conductivity transmitter screwed into the boiler shell or blowdown line. It measures the electrical conductivity of the boiler water, which indicates the dissolved solids content, and sends a 4-20 mA signal to a conductivity controller that operates a continuous blowdown valve. The manufacturer also names condensate and feedwater monitoring as uses. The transmitter belongs with the GESTRA level electrodes, limiters and controllers fitted to steam boilers in the GCC, which is why searches for GESTRA boiler control and GESTRA boiler spare parts often end at this type of component.

Ordering GESTRA parts: what we need

Send the type designation and the data from the name plate: pressure rating, connection thread, measuring length, supply voltage and serial number. Tell us which controller and blowdown valve the transmitter works with, and the boiler pressure.

Browse GESTRA products by category: Liquid Analysis Sensors.