Spirax Sarco TDS46M stainless steel thermodynamic steam trap with a replaceable seat, specifically designed for low-capacity applications and rated for a maximum operating pressure of 46 bar g. Threaded, socket-weld, or integral flanged connections are available.

This steam trap features an integral strainer, integral air vent, insulation cover, and replaceable seat. An optional BDV1 integrated blowdown valve can be installed on the strainer cover; specify this option when ordering.

Standards and Certificates

This product complies with the European Pressure Equipment Directive 97/23/EC and is available with an EN 10204 3.1 certificate. Note: Specify the certificate requirement when ordering.

Sizes and Pipe Connections

• ½”, ¾” and 1” threaded connections, BSP or NPT

• ½”, ¾” and 1” socket-weld connections, BS 3799 Class 3000 lb

• DN15, DN20 and DN25 integral flanges, EN 1092 PN40, PN100, ASME Class 150, ASME Class 300, or ASME Class 600

Materials

Item	Material
1	Body: stainless steel 1.4308 / ASTM A351 CF8
2	Cover: stainless steel 1.4301 / ASTM A479 304
3	Insulation cover: stainless steel EN 10088-1 1.4301
4	Disc: hardened steel 1.2379
5	Seat: hardened steel 1.2379
6	Bimetallic ring: bimetal
7	Support ring: stainless steel AISI 304
8	Seat gasket: reinforced exfoliated graphite
9	Strainer: stainless steel ASTM A478 316L
10	Strainer cover gasket: stainless steel AISI 304
11	Strainer cover: stainless steel 1.4308 / ASTM A351 CF8

Pressure/Temperature Limits (ISO 6552) - Threaded, Socket-Weld and EN 1092 Flanged Connections

Classification	Parameter	Details
PN100	Body design pressure	PN100
	PMA maximum allowable pressure	100 bar g @ 50°C
	TMA maximum allowable temperature	450°C @ 58.3 bar g
	Minimum allowable temperature	-50°C
	PMO maximum operating pressure	46 bar g @ 450°C
	TMO maximum operating temperature	450°C @ 46 bar g
	Minimum operating pressure	0°C
	Minimum operating temperature	1.5 bar g
	Maximum operating backpressure	Not exceeding 80% of upstream pressure
	Maximum designed cold hydraulic test pressure	150 bar g
PN40	Body design pressure	PN40
	PMA maximum allowable pressure	40 bar g @ 50°C
	TMA maximum allowable temperature	450°C @ 23.3 bar g
	Minimum allowable temperature	-50°C
	PMO maximum operating pressure	28.4 bar g @ 233°C
	TMO maximum operating temperature	450°C @ 23.3 bar g
	Minimum operating pressure	0°C
	Minimum operating temperature	1.5 bar g
	Maximum operating backpressure	Not exceeding 80% of upstream pressure
	Maximum designed cold hydraulic test pressure	60 bar g

Pressure/Temperature Limits (ISO 6552) - ASME Flanged Connections

Classification	Parameter	Details
ASME Class 600	Body design pressure	ASME Class 600
	PMA maximum allowable pressure	99.3 bar g @ 38°C
	TMA maximum allowable temperature	450°C @ 54.8 bar g
	Minimum allowable temperature	-50°C
	PMO maximum operating pressure	46 bar g
	TMO maximum operating temperature	450°C @ 46 bar g
	Minimum operating pressure	0°C
	Minimum operating temperature	1.5 bar g
	Maximum designed cold hydraulic test pressure	149 bar g
ASME Class 300	Body design pressure	ASME Class 300
	PMA maximum allowable pressure	49.6 bar g @ 38°C
	TMA maximum allowable temperature	450°C @ 27.4 bar g
	Minimum allowable temperature	-50°C
	PMO maximum operating pressure	33 bar g
	TMO maximum operating temperature	450°C @ 27.4 bar g
	Minimum operating pressure	0°C
	Minimum operating temperature	1.5 bar g
	Maximum operating backpressure	Not exceeding 80% of upstream pressure
	Maximum designed cold hydraulic test pressure	74.4 bar g
ASME Class 150	Body design pressure	ASME Class 150
	PMA maximum allowable pressure	19 bar g @ 38°C
	TMA maximum allowable temperature	450°C @ 4.6 bar g
	Minimum allowable temperature	-50°C
	PMO maximum operating pressure	14 bar g
	TMO maximum operating temperature	450°C @ 4.6 bar g
	Minimum operating pressure	0°C
	Minimum operating temperature	1.5 bar g
	Maximum operating backpressure	Not exceeding 80% of upstream pressure
	Maximum designed cold hydraulic test pressure	28.5 bar g

Weight (Approximate) kg

Size	Threaded	Socket-Weld	ASME 150	ASME 300	ASME Class 600 Flanged	PN40	PN100
½” (DN15)	1.38	1.49	2.46	2.96	3.06	3.06	4.36
¾” (DN20)	1.64	1.64	3.16	4.06	4.26	3.96	6.26
1” (DN25)	1.90	1.90	4.16	5.16	5.46	4.86	8.16

Installation Instructions

TDS46M is designed for horizontal installation with the insulation cover positioned at the top.

If downstream backpressure is present, installation of a check valve is recommended.

If discharging directly to atmosphere, installation of a silencer downstream is recommended.

For ease of maintenance, isolation valves should be installed upstream and downstream of the steam trap.

Ordering Information

Example: 1 - Spirax Sarco DN15 TDS46M thermodynamic steam trap with PN40 flanged connections.

Spare Parts

Solid-line items in the illustration are available as spare parts; dashed-line items are not supplied as spare parts.

• Insulation cover

• Cover, seat and disc assembly (2, 4, 5, 6, 7, 8)

• Strainer and gaskets (9, 10)

• Gasket set (3 sets) (8, 10)

• BDV1 blowdown valve assembly

To order spare parts, order according to the descriptions above and specify the steam trap size and model.

Example: 1 - Cover, seat and disc assembly for Spirax Sarco DN15 TDS46M thermodynamic steam trap.