Product Overview

The BPM21L is a compact carbon steel balanced pressure thermostatic steam trap with an internal strainer. The product is intended for installations where available space is limited, including OEM machinery and compact equipment packages.

Key Features

• Compact body for restricted installation spaces
• Internal strainer protects the operating internals
• Capsule-operated balanced pressure design for thermostatic condensate discharge
• Optional integral check valve version designated BPM21LCV
• Multiple capsule fills available to suit different drainage strategies

Capsule Options

The capsule fill options listed by the source document are:

Capsule Type	Operating Characteristic
STD	Operates at approximately 13°C below steam saturation temperature
NTS	Operates at approximately 6°C below steam saturation temperature
SUB	Operates at approximately 24°C below steam saturation temperature

All versions can also be supplied with an integral non-return / check valve. These versions are designated BPM21LCV.

Standards and Certification

The product fully complies with the requirements of the European Pressure Equipment Directive 97/23/EC.

The product is available with a manufacturer's Typical Test Report. All certification and inspection requirements must be stated at the time of order placement.

Sizes and Pipe Connections

Size	Connection Type
3/8 in	Screwed BSP (BS 21 parallel) or NPT
1/2 in	Screwed BSP (BS 21 parallel) or NPT
1/2 in	Socket weld

Pressure / Temperature Limits (ISO 6552)

The product must not be used in the shaded region. The product should not be used in the additional restricted region or beyond its operating range, as damage to the internals may occur.

Parameter	Value
Body design conditions	PN25
PMA Maximum allowable pressure	25 bar g @ 120°C
TMA Maximum allowable temperature	242°C @ 20 bar g
Minimum allowable temperature	-10°C
PMO Maximum operating pressure	21 bar g @ 217°C
TMO Maximum operating temperature	242°C @ 20 bar g
Minimum operating temperature	0°C
Maximum cold hydraulic test pressure	38 bar g

Local regulations may restrict the use of this product to below the conditions quoted. In the interests of product development and improvement, the manufacturer reserves the right to change the specification without notice.

Materials

No.	Part	Material	Standard / Notes
1	Cover	Steel	1.0460 (C22.8)
2	Capsule	Stainless steel	-
3	Valve seat	Stainless steel	-
4	Strainer screen	Stainless steel	-
5	Cover gasket	Nickel reinforced exfoliated graphite	-
6	Body	Steel	1.0460 (C22.8)
7	Cover bolts	Steel	M8 x 25 mm BS 1506 - 621 A B7M
8	Valve seat gasket	Stainless steel	-
9	Spacer plate	Stainless steel	-
10	Spring	Stainless steel	-

Capacities

The condensate capacity chart is plotted against differential pressure. The two lines shown in the source chart should be used to match the selected capsule operating condition to the actual differential pressure and condensate load.

Dimensions and Weights

Dimensions / weights (approximate) in mm and kg:

Size	A	B	C	D	E	Weight
3/8 in	70	62	35	15	20	0.9
1/2 in	70	62	35	15	20	0.9

Safety Information, Installation and Maintenance

For full details see Installation and Maintenance Instructions IM-P124-09 supplied with the product.

Installation Note

The trap is designed for installation with the capsule in a horizontal plane and the cover at the top, preferably with a drop leg immediately preceding the trap. Installation in a vertical plane is also acceptable.

When welding the trap into the pipeline, there is no need to remove the capsule, provided the welding is carried out by the electric arc method.

Suitable isolation valves must be installed to allow for safe maintenance and trap replacement.

Disposal

This product is recyclable. No ecological hazard is anticipated with disposal of this product, providing due care is taken.

Spare Parts

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

Available spares	Item No.
Capsule and seat assembly set	2, 3, 5, 8, 9, 10
Gasket set	5, 8
Strainer screen (packet of 3)	4

How to Order Spares

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

Example: 1 off Capsule and seat assembly for Spirax Sarco 1/2 in BPM21L balanced pressure thermostatic steam trap having STD fill operation at 13°C below steam saturation temperature.

Recommended Tightening Torques

Item	Part	Size	Torque
3	Valve seat	17 A/F	50 - 55 N m
7	Cover bolts	M8 x 25	14 - 18 N m

Ordering Information

Example: 1 off Spirax Sarco 1/2 in BPM21L balanced pressure thermostatic steam trap having screwed BSP connections. The unit is to be supplied with a steel body with internal strainer screen and STD capsule for operation approximately 13°C below steam saturation temperature.