Product Overview

The Spirax Sarco UTDS46M is a workshop-maintainable stainless steel thermodynamic steam trap for low-capacity drainage duties up to 46 bar g. The trap combines an integral strainer, integral air vent, insulating cover, and replaceable seat, and mounts to a suitable pipeline connector with two screws for fast installation and replacement.

Key Features

• Stainless steel body and cap for corrosion-resistant steam service
• Integral strainer helps protect the operating parts from dirt
• Integral air vent improves start-up performance
• Replaceable seat and top assembly simplify workshop maintenance
• Optional BDV2 integral blowdown valve retrofit can be specified at order stage

Standards and Certification

The product complies with the European Pressure Equipment Directive 2014/68/EU.

Certification to EN 10204 3.1 is available when all certification and inspection requirements are specified at the time of order.

Pipeline Connector Options

UTDS46M is supplied for use with swivel pipeline connectors. The technical information sheet lists the following connector options:

Connector	Description	Rating	Reference
PC10HP	Straight connector	ASME Class 600	TI-P128-10
PC3	Straight connector with one piston isolation valve	ASME Class 600	TI-P128-02
PC4	Straight connector with two piston isolation valves	ASME Class 600	TI-P128-03

The final pressure and temperature limits of the assembled unit depend on the selected pipeline connector and end connection.

Pressure / Temperature Limits

The grey shaded area on the chart indicates a region where the product must not be used. The lower shaded region indicates a zone where the product should not be used because internal damage may occur.

Parameter	Metric	Imperial
Body design conditions	ASME Class 600	ASME Class 600
PMA Maximum allowable pressure	99.3 bar g @ 38°C	1,440 psig @ 100°F
TMA Maximum allowable temperature	425°C @ 56 bar g	797°F @ 812 psig
Minimum allowable temperature	-40°C	-40°F
PMO Maximum operating pressure	46 bar g @ 425°C	667 psig @ 797°F
TMO Maximum operating temperature	425°C @ 46 bar g	797°F @ 667 psig
Minimum operating pressure	1.5 bar g	22 psig
Minimum operating temperature	0°C	32°F
Note	For lower operating temperatures consult Spirax Sarco	-
PMOB Maximum operating backpressure	80% of upstream pressure	80% of upstream pressure
Maximum cold hydraulic test pressure	149 bar g	2,161 psig

Materials

No.	Part	Material	Standard
1	Body	Stainless steel	1.4308 / ASTM A351 CF8
2	Top cap	Stainless steel	1.4301 / ASTM A479 304
3	Insulating cover	Stainless steel	EN 10088-1 1.4301
4	Disc	Hardened steel	1.2379
5	Seat	Hardened steel	1.2379
6	Bimetal ring	Bimetal	-
7	Support	Stainless steel	AISI 304
8	Seat gasket	Graphite foil	-
9	Strainer screen	Stainless steel	ASTM A478 316L
10	Strainer cap gasket	Stainless steel	AISI 304
11	Strainer cap	Stainless steel	1.4308 / ASTM A351 CF8
12	Flange	Steel - ELNP	ASTM A193 B7
13	Screws	Steel	ASTM A193 B7
14	Inner gasket	Graphite / stainless steel laminate	AISI 316 strip
15	Outer gasket	Graphite / stainless steel laminate	AISI 316 strip
16	Split ring	Stainless steel	ASTM A240 304
17	Crescent ring	Carbon spring steel	-

Capacity and Dimensions

The capacity graph plots condensate discharge against differential pressure from 0.3 to 46 bar. Final sizing should be checked against actual operating differential pressure.

Dimensions and Weight

Dimension	Value
Cover diameter	63 mm (2.5 in)
Overall height	67 mm (2.9 in)
Body height reference	56 mm (2.2 in)
Overall length	113 mm (4.4 in)
Top withdrawal distance	30 mm (1.18 in)
Outlet withdrawal distance	50 mm (2.0 in)
Approximate weight	1.75 kg (3.86 lb)

Installation and Maintenance

For full details, refer to Installation and Maintenance Instructions IM-P187-05.

• Install the trap with the disc in a horizontal plane and the insulating cover at the top.
• Fit a non-return valve when discharging condensate into return lines with backpressure.
• Fit a diffuser when discharging to atmosphere.
• Consider isolation valves upstream and downstream for safe maintenance.

Spare Parts

The spare parts available are shown in solid outline. Parts shown in grey line are not supplied as spares.

Available spares	Item No.
Insulating cover	3
Top cap, seat and disc assembly	2, 4, 5, 6, 7, 8
Strainer screen	9, 10
Set of gaskets (packet of 3 sets)	8, 10
Connector screws and gaskets	13, 14, 15
BDV2 blowdown valve retrofit kit	-

Recommended Tightening Torques

Item	Part	Size	Torque	Imperial
2	Top cap	50 A/F	400 N m	295 lbf ft
11	Strainer cap	24 A/F	110 N m	46.5 - 48.7 lbf ft
13	Connector screws	9/16 in A/F	33 N m	19 lbf ft

Spare Parts Ordering

Always order spares by the description in the "Available spares" column and state the size and type of steam trap.

Example: 1 - Top cap, seat and disc assembly for a Spirax Sarco UTDS46M thermodynamic steam trap.

Ordering Information

UTDS46M is supplied in two parts and both parts must be ordered separately:

1. Swivel pipeline connector: PC10HP, PC3, or PC4.
2. UTDS46M trap complete with inner and outer gaskets and two connector screws, supplied in a protective box.

Any optional extras, including the BDV2 integral blowdown valve retrofit, must be specified at the time of order placement.

Ordering Example

1 off Spirax Sarco PC10HP swivel pipeline connector with socket weld connections.

1 off Spirax Sarco UTDS46M thermodynamic steam trap fitted with a BDV2 integral blowdown valve, supplied complete with connector screws and gaskets.