Spirax-Sarco TD42L-A743-CA40 Thermodynamic Steam Trap

Spirax-Sarco TD42L-A743-CA40 Thermodynamic Steam Trap is a compact, low-capacity 3/4 in NPT thermodynamic trap from Spirax Sarco designed to discharge condensate close to steam temperature while minimizing steam loss in small to mid-size lines. Built with a stainless steel body in ASTM A743 CA40F and finished with ENP (electroless nickel plating), the trap combines corrosion resistance with a distinct Cool Blue finish. The 3/4" TD42L model is commonly used on coil jackets, small steam headers, and heat exchangers where fast condensate removal is required. It features screw-threaded connections for straightforward installation and a compact footprint suitable for tight spaces, with an insulating cover option to limit heat loss in exposed environments. Maximum service temperature is listed around 752°F (approximately 400°C), and the configuration supports substantial pressures—up to 600 psig (about 41 bar g) in some variants or PN63 (63 bar g) depending on the exact model. The TD42L family is designed to maintain condensate discharge near the steam temperature, helping conserve energy and improve overall steam system efficiency. This TD42L-A743-CA40 variant pairs CA40 stainless steel with ENP finish to deliver robust performance in boiler rooms, chemical processing, and other industrial settings where reliable condensate removal from 3/4" lines is essential.