Boiler house Steam injectors
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2025
TI-P401-05 EMM Issue 13
IN15, IN25M and IN40M Steam Injectors
Description Spirax Sarco steam injectors use steam to raise the temperature of water or other liquids. They work by using a jet of steam to draw in the liquid through radial ports, mix it, and distribute the heated liquid throughout the tank or vessel. The circulation induced by the injector ensures thorough mixing and avoids temperature stratification. Three sizes of injector are available to suit a wide range of flowrates. The smallest, the IN15, has a male and female thread for direct mounting to a tank wall from the outside, or to pipework within the tank. The IN25M and IN40M are available with either male thread or butt-weld connection and are fitted to pipework in the tank, or to a tank wall connection. For higher capacities, two or more injectors may be mounted in parallel.
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Principal features: - All stainless steel.
- Ideal for boiler feedtank heating and de-aeration. - For efficient steam heating of water and other fluids. - Heats, mixes and circulates - no moving parts. - Compact design - minimises noise and vibration.
Pressure/temperature limits Body design rating
PN25
IN40M (available screwed or butt-weld)
0.5 bar g (7.3 psi g)
Minimum operating pressure
17 bar g @ 207 ° C (247 psi g @ 405 F)
Maximum saturated steam condition
90 ° C (194 °F)
Maximum heated liquid temperature (tank/vessel vented to atmosphere)
Materials Austenitic stainless steel ASTM A351 CF3M.
IN25M (available screwed or butt-weld)
Available types The IN15 is supplied with a ½ " female and 1" male thread, available in BSPT or NPT. Options for the larger injectors are shown below:
IN25M
IN40M
IN15
BSPT male NPT male Butt-weld
1 ½ " 1 ½ "
1"
1"
1 ½ " Schedule 80
1" Schedule 80
TI-P401-05 EMM Issue 13
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IN15, IN25M and IN40M Steam Injectors
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