Spirax Sarco - Catalogo Agosto 2017

Steam traps

USM21

Sealed Bimetallic Steam Trap

for use with Pipeline Connectors

Bimetallic

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification without notice.

Description

The USM21 is a pre-set and maintenance free sealed bimetallic

steam trap manufactured in stainless steel. It is designed for steam

pressures up to 21 bar and applications such as steam tracing

and mains drips. When installed in any position with a suitable

pipeline connector the USM21 can easily and simply be removed

without breaking into the pipeline, thus speeding up trap

replacement with minimal system downtime. Pipeline connectors

are available with screwed, socket weld and flanged connections.

Standards

This product fully complies with the requirements of the European

Pressure Equipment Directive 97 / 23 / EC and carries the

mark

when so required.

Note: The body/cover weld joint complies with ASME section IX.

Certification

This product is available with certification to EN 10204 3.1.

5.3.19

Note: All certification/inspection requirements must be stated

at the time of order placement.

Pressure / temperature limits (ISO 6552)

��

�� Steam

saturation

��

Pressure bar g

The product must not be used in this region.

The product should not be used in this region or beyond

its operating range as damage to the internals may occur.

The model of pipeline connector and connections selected

will dictate the maximum operating pressure and temperature of the

complete assembly. Consult the specified Technical Information sheet

as listed in 'Sizes and pipe connections' for relevant data.

Pipeline connector options

The USM can be fitted to a variety of pipeline connectors including:

PC10HP

PC20

IPC2 _

PC3 _

PC4 _

Straight connector

ASME 600

+ 'Y' type strainer

ASME 300

+ 'Y' type strainer and Spiratec sensor

+ 1 piston isolation valve

ASME 600

+ 2 piston isolation valves ASME 600

(TI-P128-10)

(TI-P128-15)

(TI-P128-17)

(TI-P128-02)

(TI-P128-03)

TI-P625-04

ST Issue 2

Note:

�� curve

��

USM21 fitted to a

PC10HPconnector 109 8 73

Body design conditions

PMA Maximum allowable pressure

TMA Maximum allowable temperature

Minimum allowable temperature

PMO

Maximum operating pressure

for saturated steam service

TMO Maximum operating temperature

* Minimum operating temperature

USM21 fitted to a

PC3_ connector

Materials

No. Part

1 Body

2 Cover

3 Seat

4 Stem

5 Bimetal

6 Lock-nuts

7 Body/seat gasket

8 Screen

9 Inner gasket

10 Outer gasket

11 Connector screws

ASME 300

50 bar g @ 40°C

450°C @ 29 bar g

-29°C

21 bar g

400°C @ 21 bar g

* Traps are available in a range of subcooled temperature settings.

Except for start-up and shutdown, they must operate above the

minimum differential pressure values shown in the table below:

Material

Stainless steel

Nickel alloy

Stainless steel

/ Graphite filler

Stainless steel

/ Graphite filler

Carbon steel

ASTM A351 CF8

AISI 316L

AISI 410

G. Rau H46

AISI 304L

AISI 316L

AISI 304L

Spirally wound

AISI 304 strip

Spirally wound

AISI 304 strip

0°C

21 bar

Designed for a maximum cold hydraulic test pressure of 75 bar g

DPMX Maximum differential pressure

Nominal subcooled

External

temperature

identification

-10°C

'-1'

-30°C

'-3'

-50°C

'-5'

-70°C

'-7'

Threshold

differential pressure

5 bar

2 bar

0.5 bar

0.1 bar

ASTM A193 B7

See the relevant Technical Information sheet as listed above for

details of the connections available for each pipeline connector.

USM21 fitted to a

PC4_ connector