Cast Iron Exhaust Heads
Cast Iron exhaust heads for up to 40% by weight of the units flow capacity

Wright-Austin Cast Iron Exhaust HeadWright-Austin cast iron exhaust heads are designed for long service life, the body, cover and separating element are constructed of high tensile cast iron which resists fractures and corrosion.

ASME Code Stamps and CRN are not applicable because exhaust heads are not pressure vessels. The components to build cast iron exhaust heads are usually stocked items and shipments made within 1 week after receipt of an order. If the lead time is critical, please contact our office and obtain a lead-time estimate based upon the current manufacturing backlog. If you need assistance with proper selection, please fill-out our inquiry form.

How to Size an Exhaust Head

When sizing an exhaust head, the pressure that is used to size it should always be Atmospheric (14.7 PSIA), no matter what the application pressure is. The flow rate is the determining factor.

To calculate the pressure drop through an exhaust head, simply follow the equation stated on the Air Sizing Chart or Steam Sizing Chart. The pressure always stays the same since there is no back pressure; the rated pressure drop (obtained from the right side of the sizing charts) always remains the same. (0.9 PSI).

The difference between PSIG and PSIA is the “measured” pressure is the difference between the unknown pressure and the atmospheric pressure. This difference is referred to as the gauge pressure (PSIG), whereas the true pressure, called absolute pressure (PSIA) includes atmospheric pressure. To obtain operating pressures in PSIA add 14.7 to gauge pressure PSIG.

Cast iron and fabricated exhaust heads have different dimensions and therefore different capacity ratings for equivalent connection sizes.

For alloy materials and temperatures over 650 deg. F, you should contact us.



Engineering Data:
Air Sizing Chart
Steam Sizing Chart


Outline Drawings:
FNPT (threaded)
125# FF ANSI flanged

1" 160 45
1½" 370 100
2" - 2½" 1,000 280
3" 2,100 500
4" 2,700 700
5" 4,000 1,100
6" 6,000 1,700
8" 10,500 2,900
10" 16,000 4,500
1" FNPT 1.40EHC
1½" FNPT 1.540EHC
2" FNPT 2.40EHC
2½" FNPT 2.540EHC
3" FNPT 3.40EHC
125# FF ANSI Flange 3.40EHCFN
4" FNPT 4.40EHC
125# FF ANSI Flange 4.40EHCFN
5" 125# FF ANSI Flange 5.40EHC
6" 125# FF ANSI Flange 6.40EHC
8" 125# FF ANSI Flange 8.40EHC
10" 125# FF ANSI Flange 10.40EHC