SPIRAX SARCO HM12/12 D17 PN16 GG20

Spirax Sarco Inverted Bucket Steam Trap

Description

The Spirax Sarco HM12/12 is a high-quality inverted bucket steam trap designed for reliable and efficient removal of condensate from steam process applications. Its robust GG25 cast iron construction ensures durability and a long service life even in demanding industrial environments. This mechanical trap operates on the density difference between steam and condensate, providing excellent service for general purpose steam main drainage and process plant applications.

Specifications

• Manufacturer: Spirax Sarco
• Model: HM12/12
• Variant Code: D17
• Body Material: GG25 Cast Iron
• Nominal Pressure Rating: PN16 (16 bar)
• Differential Pressure (as per label): 4 bar
• Maximum Operating Temperature: 204 deg C
• Connection Type: Threaded (Assumed BSP or NPT)

Label Info

• Brand: Spirax Sarco
• Model: HM12/12
• Type Code: D17
• Pressure: 4 bar
• Temperature: 204 C

Application

This steam trap is ideal for use in steam mains, turbine drains, process vessels, heat exchangers, and other applications where efficient condensate removal is critical for process efficiency and equipment protection.

Country of Origin

Made in France.

CO2 Impact

By choosing this pre-owned component, you are actively contributing to the circular economy and avoiding the emission of approximately 8.0 kg of CO2, which would have been generated during the production of a new unit.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the primary function of an inverted bucket steam trap like the HM12/12?

Its main function is to automatically drain condensate, air, and other non-condensable gases from a steam system while preventing the loss of live steam. It operates mechanically based on the buoyancy of an inverted bucket inside the trap body.

The label states 4 bar, but the body is marked PN16. What is the actual pressure limit?

The PN16 (16 bar) is the maximum pressure the body casting can safely withstand. The 4 bar on the label refers to the maximum differential pressure (the difference between inlet and outlet pressure) that the internal orifice is sized for. Using the trap above this differential pressure will prevent it from closing properly, leading to steam loss.

Is this trap suitable for applications with significant back pressure?

Inverted bucket traps, including the HM12/12, are known for their excellent tolerance to back pressure. However, the trap’s capacity will be reduced as back pressure increases. It is crucial to size the trap based on the actual differential pressure for the specific application.

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Last Update: Friday, March 13, 2026