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BPC32 and BPC32Y Carbon Steel Balanced Pressure Thermostatic Steam Traps

Carbon steel balanced pressure thermostatic steam traps for saturated-steam systems, with threaded, welded, flanged, capsule, strainer and check-valve options.

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Overview

BPC32 and BPC32Y are in-line maintainable, straight-through carbon steel pressure-balanced thermostatic steam traps. Their robust construction provides strong resistance to water hammer and freezing, making them suitable for saturated-steam mains and condensate drainage from a wide range of process-heating equipment.

The main difference between the two base models is the internal strainer design:

  • BPC32: fitted with a standard flat stainless-steel strainer for a more compact arrangement.
  • BPC32Y: fitted with a Y-type cylindrical strainer with a larger filtration area and better tolerance of dirt and debris.

Configurations and Options

ModelConnectionsInternal strainerIntegral check valveStandard capsuleTypical application and selection guidance
BPC32Threaded / weldedFlat stainless-steel strainerNo’STD’Compact standard version for conventional saturated-steam mains where installation space is limited and the medium is relatively clean.
BPC32YThreaded / weldedY-type cylindrical, high-capacity strainerNo’STD’High-dirt-capacity version with a larger strainer area; recommended for systems with more start-up debris.
BPC32CVThreaded / weldedFlat stainless-steel strainerYes’STD’Compact non-return version with a check valve to help prevent condensate from flowing back into process equipment during shutdown.
BPC32YCVThreaded / weldedY-type cylindrical, high-capacity strainerYes’STD’Fully featured straight-through version combining higher dirt capacity with protection against condensate backflow for more complex steam lines.

Capsules and Operation

Standard capsule (STD): discharges condensate approximately 12°C below saturated-steam temperature.

NTS capsule: discharges condensate approximately 6°C below saturated-steam temperature.

SUB capsule: discharges condensate approximately 24°C below saturated-steam temperature.

Note: specify the required capsule type when ordering.

Standards

This product complies with European Pressure Equipment Directive 97/23/EC.

Certification

Material certification to EN 10204 3.1 is available for this product.

Note: specify the certification requirement when ordering.

Sizes and Pipe Connections

Connection typeApplicable pipe sizesInternational / industry standard
Threaded1/2”, 3/4”, 1”BSP or NPT pipe thread
Socket weld (SW)1/2”, 3/4”, 1”BS 3799 socket-weld standard
Butt weld (BW)1/2”, 3/4”, 1”EN 12 627 butt-weld end preparation
Integral flangedDN15, DN20, DN25EN 1092 PN40
Integral flangedDN15, DN20, DN25ANSI B 16.5 Class 150 / 300
Integral flangedDN15, DN20, DN25JIS/KS 10K / 20K

🛠️ Connection and selection guide:

  • Threaded and welded connections: Threaded connections suit conventional pipework and compact installation. Socket-weld (SW) and butt-weld (BW) bodies are welded directly to the pipework, offering excellent resistance to external leakage for fully welded lines.
  • Integral flanged connections: Select the flange standard according to the steam-system design specification. EN 1092 is suitable for general steam networks at PN40; ANSI B 16.5 is commonly used in petrochemical or ASME projects and is available in Class 150 and Class 300; JIS/KS suits complete steam equipment designed to Japanese or Korean standards.

Operating Limits

ItemValue
Body design conditionsPN40
PMA – maximum allowable pressure50 bar g @ 50°C
TMA – maximum allowable temperature400°C @ 35 bar g
Minimum allowable temperature-60°C
PMO – maximum operating pressure for saturated steam32 bar g @ 281°C
TMO – maximum operating temperature281°C @ 32 bar g
Minimum operating temperature0°C
For lower temperatures, consult Spirax Sarco
Design maximum cold hydraulic test pressure75 bar g

Materials

No.PartMaterial
1CapCarbon steelDIN 17243 C22.8 (W/S 1.0460), ASTM A105N
2CapsuleStainless steel
3SeatStainless steelBS 970 431 S29
5StrainerStainless steelAISI 304
7Cap gasketStainless-steel reinforced exfoliated graphite
8BodyCarbon steelDIN 17243 C22.8 (W/S 1.0460), ASTM A105N
9Cap boltsStainless steel (M10 x 30)A2-70
10Strainer capCarbon steelDIN 17243 C22.8 (W/S 1.0460), ASTM A105N
11Strainer cap gasketStainless steelBS 1449 304 S16
17SpringStainless steel
18Separator plateStainless steel

Dimensions and Weights (Approximate), mm and kg

BPC32 Dimensions and Weights (Approximate)

Units: mm and kg

SizeAA1BCDEFGWeight (threaded / welded)Weight (flanged)
1/2” DN159515094641737--1.42.9
3/4” DN209515094641937--1.43.5
1” DN259516094642337--1.54.1

BPC32 dimensional drawing

BPC32Y Dimensions and Weights (Approximate)

Units: mm and kg

SizeAA1BCDEFGWeight (threaded / welded)Weight (flanged)
1/2” DN15951509464-3753281.63.1
3/4” DN20951509464-3754281.63.7
1” DN25951609464-3756281.84.4

Discharge Capacity

Discharge capacity chart

Ordering Information

Example: 1 off Spirax Sarco BPC32Y maintainable carbon-steel pressure-balanced thermostatic steam trap, BSP threaded connection, Y-type strainer and STD capsule, operating approximately 12°C below saturated-steam temperature.

Spare Parts

Available spare parts are shown by solid lines in the drawing. Parts shown by dashed lines are not supplied as spares.

Available spare parts

Capsule and seat assembly2, 3, 17, 18
StrainerBPC32 (3 pcs)5
Strainer and gasketBPC32Y (1 each)5, 11
Cap gasket set(set of 3)7
Strainer cap gasket(set of 3)11

Ordering Spare Parts

Order spare parts using the descriptions above and state the steam-trap model, size and capsule type.

Example: 1 off capsule and seat assembly for a DN25 BPC32 steam trap.

An ‘STD’ capsule discharges condensate approximately 12°C below saturated-steam temperature.

Spare-parts drawing

*Note: items 9 and 10 are not supplied as spare parts.

FAQ

What are the operating characteristics of BPC32 and BPC32Y balanced pressure thermostatic steam traps?

BPC32 and BPC32Y use a balanced pressure thermostatic operating principle, controlling condensate discharge temperature through a capsule. The standard STD capsule discharges condensate at approximately 12°C below saturated steam temperature; optional NTS capsule discharges at approximately 6°C below saturation, or SUB capsule at approximately 24°C below saturation. This series is suitable for condensate drainage on saturated steam mains and process heating equipment, with good water hammer resistance and freeze protection.

How to choose between BPC32 and BPC32Y, and what is the difference in strainer design?

The main difference lies in the integral strainer design. BPC32 has a compact flat stainless steel strainer, suitable for常规 steam systems with limited installation space and relatively clean media. BPC32Y has a Y-type cylindrical high-capacity stainless steel strainer with larger filtration area and higher dirt-holding capacity, better suited for systems with higher initial debris levels or requiring longer maintenance intervals.

Which applications should use BPC32CV or BPC32YCV with integral check valve?

When there is a risk of condensate backflow into process equipment after shutdown, CV models with integral check valves should be selected. BPC32CV adds check valve function to the compact BPC32 design; BPC32YCV combines Y-type high-capacity strainer with integral check valve, suitable for complex steam piping applications requiring both high dirt resistance and backflow prevention.

What connection options and maximum working pressure are available for BPC32/BPC32Y?

Products are available in 1/2\", 3/4\" and 1\" BSP or NPT threaded connections, BS 3799 socket weld and EN 12627 butt weld connections; flanged connections in DN15, DN20, DN25 matching EN 1092 PN40, ANSI B16.5 Class 150/300 or JIS/KS 10K/20K standards. The body design condition is PN40, with maximum working pressure PMO of 32 bar g for saturated steam, corresponding to a maximum working temperature of 281°C. Specific connection standards and configurations should be confirmed according to actual piping specifications and application conditions.

Can BPC32 and BPC32Y be maintained inline, and what are the common replaceable parts?

BPC32 and BPC32Y are designed for inline maintenance. Available spare parts include capsule and seat assemblies, strainers, bonnet gasket sets, and strainer cover gaskets. BPC32 has a replaceable strainer; BPC32Y has replaceable strainer and strainer cover gasket. When ordering spares, specify the steam trap model, size, and capsule type to ensure correct configuration.

Documents

BPC32 and BPC32Y Carbon Steel Balanced Pressure Thermostatic Steam TrapsDatasheet · EnglishBPC32, BPC32Y, BPC32F, BPC32YF, BPC32CV, BPC32CVF, BPC32YCV and BPCYCVF Carbon Steel Pressure-balanced Thermostatic Steam TrapsManual · Chinese

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