The Spirax Sarco VHT steam vent head (including models VHT2 to VHT8) is an atmospheric discharge device designed for the end of vertical steam vent pipes. Its body is made of 304L austenitic stainless steel and features an internal baffle arrangement that effectively separates entrained moisture from steam. It is available in a range of connection sizes from DN50 to DN300 and supports threaded and EN and ASME flanged connections. It is suitable for vertical installation and is intended to provide safer discharge of drier steam and reduce risk to the surrounding area.
Spirax Sarco VHT steam vent head, three-quarter product photo
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VHT Steam Vent Head | Spirax Sarco
Vertical steam venting and moisture separation device, available in a range of sizes and connection types.
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Specifications
- Body Material
- Austenitic stainless steel 304L
- Flange Material
- Carbon steel, blackened finish
- Internal Construction
- Baffle plate
- Installation Orientation
- Vertical installation
- Connection Sizes
- DN50, DN80, DN100, DN150, DN200, DN250, DN300
- Connection Type
- BSP threaded, NPT threaded, EN 1092 PN16 flanged, ASME 150 flanged
Application scenarios
Atmospheric discharge at the end of a vertical steam vent pipe
Installed at the end of a vertical steam vent pipe, it safely discharges steam to the atmosphere. Internal baffles separate entrained water from the steam, helping produce drier steam discharge and reduce risks to personnel and buildings in the discharge area.
FAQ
How does the Spirax Sarco VHT vent head reduce risks during direct steam discharge?
The VHT vent head is installed at the top of a vertical steam vent pipe. Its internal baffle plate separates entrained moisture from the steam, allowing dry steam to discharge safely to atmosphere and reducing the likelihood of personnel discomfort, injury and building damage.
Which steam system equipment is suitable for VHT vent head installation?
The VHT vent head is suitable for equipment requiring steam venting, including blowdown vessels, condensate receivers, boiler feedwater tanks and hot water storage tanks. It must be used on a vertical steam vent pipe.
Can the VHT vent head be installed on safety valve outlet pipework?
No. The VHT vent head must not be used on a safety valve outlet. Discharge arrangements for safety valve outlets must comply with applicable safety codes and safety valve system requirements.
How should a VHT vent head with the appropriate size and connection type be selected for a vent pipe?
A VHT vent head with the same size as the vent pipe can generally be selected. VHT2 is DN50 and is available with BSP or NPT threaded connections; VHT3 is DN80 and can be supplied with BSP, NPT threaded, or EN 1092 PN16/ASME 150 flanged connections; VHT4, VHT6 and VHT8 correspond to DN100, DN150 and DN200 respectively and use EN 1092 PN16 or ASME 150 flanged connections. The specific configuration must be confirmed according to the actual size and application conditions.
What are the material, installation and maintenance requirements for the VHT vent head?
The VHT vent head body is made from 304L austenitic stainless steel, while the flange is blackened carbon steel. The stainless steel body supports long-term maintenance-free operation. Both threaded and flanged installations require a straight pipe section, and the light flanges on flanged connection products comply with PN and ASME (ANSI) flange standards. Detailed installation and maintenance requirements must follow the installation and maintenance instructions supplied with the product.