The 4 Bolt Steam Trap Platform

Masthead background

The 4 Bolt Steam Trap Platform: seamless replacement for high-pressure systems

Many high-pressure steam systems are already built around 4-bolt connections. But when it comes to maintenance or performance upgrades, making changes can feel disruptive, often involving rework, risk, and unnecessary downtime. 

Maintaining high-pressure steam systems has always required a careful balance between safety, uptime, and cost. Traditional trap replacement often means breaking into the line, managing permits and accepting planned outages—all of which add complexity and risk to routine maintenance. 
 
The 4 Bolt Steam Trap Platform from Spirax Sarco provides a more straightforward path. Designed to integrate with existing 4-bolt installations, it lets you upgrade your steam-trapping approach without changing the pipework. That means you can improve safety, reduce maintenance time, and standardize your approach across sites, without introducing unnecessary complexity. 
 
It also brings greater confidence during maintenance. With a dedicated high-pressure interface, maintenance teams can be confident the correct trap is installed every time. Combined with fast, repeatable replacement, it helps maintenance teams work more efficiently, particularly in demanding environments where downtime and safety exposure are critical.

Key benefits

Create a safer evironment

Safer, faster, and repeatable steam trap replacement

Support audit readiness validation

Save time and money on maintenance needs

Continuous optimisation

Eliminate pipework disturbance and avoid line break-in

Reduce plant downtime

Reduce downtime in emergency situations

Protect plant equipment

Increase installation confidence with a dedicated high-pressure interface

Longterm resilience

Provide clear differentiation for higher pressure lines

Create a safer evironment

Improve plant safety and simplify maintenance processes

Precise control

Reduce steam loss from leaking steam traps

Flexible maintenance agreements

Support long‑term site standardization of high-pressure steam trapping

Discover the 4 Bolt Steam Trap Platform

Compliance and standards 

  • Designed for ASME Class 900 high-pressure steam   
  • Maximum allowable temperature: 482 °C @ 86 bar g / 900 °F @ 1245 psi g
  • Available in DN15–DN25 sizes 
  • Suitable for continuous saturated steam systems  
Second image of factory for 4-bolt

Features

  • Dedicated 4-bolt high-pressure pipeline connector (PC90) 
  • Compatible with thermodynamic (UTDS90) and bimetallic (USM90) steam traps 
  • Enables trap replacement without pipeline break-in 
  • Retrofit-compatible with existing 4-bolt installations 
  • Supports multiple trap technologies on a single connector platform 
  • Optional configuration including blowdown capability via adapter allows quick strainer cleaning and debris removal while maintaining system uptime and minimizing maintenance intervention 
Image of 4-bolt

How it tackles key challenges

Reduces incorrect trap selection 

Prevents installation errors by only allowing compatible high-pressure traps to fit, reducing risk and improving safety at the point of servicing.  

Reduces downtime during maintenance

Enables fast, straightforward replacement with minimal disruption, helping keep systems running and limiting exposure during maintenance activities.  

Proven performance for high-pressure applications

Built on proven Spirax Sarco technology, the 4 Bolt Steam Trap Platform delivers a flexible high-pressure steam-trapping solution for Oil & Gas, Chemical, and Power applications, backed by global expertise, application support, and training.

Supports upgrade without redesign 

Retrofit compatibility with existing 4-bolt systems means sites can standardize and upgrade performance without re-piping or major system changes. 

Reduces safety exposure on high-pressure lines

Reduces manual intervention and complexity, supporting safer working conditions for maintenance teams in demanding environments.  

Energy and sustainability pressures 

Improves condensate removal and reduces steam losses, helping reduce energy consumption and associated CO₂ output.  

Simplify High-Pressure Steam Trap Maintenance

Simplify steam trap replacement, reduce downtime, and move towards a more standardized, maintainable steam system - without changing your pipework

Discover more
Image of factory for 4-bolt

Product brochure

Document Language Reference number Download
Applications Overview for the steam and condensate loop English SPB-1025-US Download PDF
Product Overview English SPB1027-US Download PDF
Steam Trapping Overview English SPB1009-US Download PDF

Technical documentation

Document Language Reference number Download
BTD52L and BTD52L Food+ Thermodynamic Steam Trap English TI-P181-01 Download PDF
HP45 Bimetallic Steam Trap English TI-P623-02 Download PDF
HP70 Series Bimetallic Steam Trap English TI-P071-01 Download PDF
PC90 4-Bolt Pipeline Connector English TI-P806-01 Download PDF
SMC32 and SMC32Y Carbon Steel Bimetallic Steam Traps English TI-P076-10 Download PDF
TD120M High Pressure Thermodynamic Steam Trap with Replaceable Seat English TI-P150-11 Download PDF
TD42L and TD42H Thermodynamic Steam Traps English TI-S01-03 Download PDF
TD62LM & TD62M Thermodynamic Steam Traps with replaceable seats ASTM Body (Flanged connections) English TI-P068-20 Download PDF
TD62LM and TD62M Thermodynamic Steam Traps with replaceable seats (Screwed /Socket Weld) English TI-P068-08 Download PDF
TDC46M Carbon Steel Thermodynamic Steam Trap with Maintainable Seat English TI-P187-04 Download PDF
TDS46M Stainless Steel Thermodynamic Steam Trap with Maintainable Seat English TI-P187-02 Download PDF
Thermo-Dynamic Liquid Drain Trap TDA52 English TI-P106-03-US Download PDF
Thermodynamic Steam Trap TD52 English TI-P014-23-US Download PDF
Thermodynamic Steam Trap TDC English TI-P019-06-US Download PDF
Thermodynamic Steam Trap TDT Tracer Trap English TI-P019-07-US Download PDF
Universal Pipeline Connector (Requires Universal Trap of Choice) English TI-P127-03-US Download PDF
USM21 Sealed Bimetallic Steam Trap for use with Pipeline Connectors English TI-P625-04 Download PDF
USM90 Stainless Steel Bimetallic Steam Trap for use with 4-Bolt Pipeline Connector English TI-P805-01 Download PDF
USTS II Universal Steam Trap Station (Requires Universal Trap of Choice) English TI-P124-02-US Download PDF
UTD52 Series Universal Thermodynamic Steam Trap (for use with Universal Connector) English TI-P017-12-US Download PDF
UTD52L Series Bar Stock Universal Thermodynamic Steam Trap (for use with Universal Connector) English TI-P614-04-US Download PDF
UTDS90 Stainless Steel Thermodynamic Steam Trap for use with 4-Bolt Pipeline Connector English TI-P804-01 Download PDF

Installation documentation

Document Language Reference number Download
Bimetallic Steam Traps SM24H English IM 2.102-US Download PDF
BTD52L Thermodynamic Steam Trap English IM-P181-03-US Download PDF
HP70 Series Bimetallic Steam Trap English IM-P071-02-US Download PDF
HP80, HP100, HP150 and HP210 Series Bimetallic Steam Traps English IM-P623-04-US Download PDF
PC90 4-Bolt Pipeline Connector English IM-P806-02 Download PDF
TD120M Thermodynamic Steam Trap with Replaceable Seat English IM P150.12-US Download PDF
TD52 and TDT Thermo-Dynamic Steam Traps English IM-2-516-US Download PDF
TDC Thermo-Dynamic Steam Trap English IM-2-5162-US Download PDF
ThermoDynamic Drain Traps TDA52 English IM 7.314-US Download PDF
Thermo-Dynamic Steam Trap TD42 English IM-2-502-US Download PDF
Thermo-Dynamic Steam Trap UTD52L, UTD52H and UTD52L-HP with Universal Connector English IM-2-5161-US Download PDF
Thermo-Dynamic Steam Traps TD62 English IM-2-525-US Download PDF
TSS 300 Thermostatic Steam Traps English IM-2-0001-US Download PDF
USM90 Sealed Bimetallic Steam Trap for use with Pipeline Connectors English IM-P805-02 Download PDF
UTD 42L/LA and UTD 42H/HA Steam Trap and Swivel Connector English IM-P154-02-US Download PDF
UTDS90 Stainless Steel Thermodynamic Steam Trap for use with 4-Bolt Pipeline Connector English IM-P804-02 Download PDF