To prevent the shaft from taking a permanent set when the blower is idle but still exposed to the high temperature, a turning gear is provided to keep the blower rotating at a very slow speed of 25 - 40 RPM; alternatively a VFD speed control can be used AB Blower Co.com/aboutus. Special construction and shaft sealing devices are available for blower service requiring zero or minimal gas leakage into and out of casing. To do this the following features on the blower must be provided:

- Double welded casing construction;
- Steam flows between the housing walls to maintain a constant 285 F gas temperature inside the fan (because below 285 F sulfur will change from a gaseous to a solid state and will "freeze" to the blower surfaces causing damage or destruction);
- A mechanical shaft seal with Valve Seal Manufacturer heat tracing and purge by air Automobile Cylinder Gasket or nitrogen;
- To assure tight tolerances between the shaft and shaft seal, the housing should be supported at the centerline, and grows concentric to the fan shaft when exposed to heat.
Additional information can be found at the AB Blower company web site http://barryfan.barryfan. The Clause process is one of the methods used to remove the hydrogene sulphide, and while doing so, recover elementary sulfur.
nis@primus. is a world wide distributor of industrial process ans OEM fans and blowers, as well as fan components; including high pressure blowers, high temperature fans, spark resistant and explosion proof ventilators, tubeaxial and vaneaxial high pressure ventilators.barryfan. now offers gas-tight and zero leakage steam-jacketed blowers for Sulfur Recovery in Chemical Industry.
Some special materials and alloys frequently used in gas tight fans, especially for service in hazardous, abrasive, corrosive and high temperature environments, include:

Corten, ASTM A36 Carbon Steel, Hastelloy, Inconel, Stainless Steels of different kinds, Titanium, Monel, Aluminum, Teflon, Rubber Lining.

AB Blower Co. In oil rfining processes its presence is undesirable, and it must be removed.

Steam jacketed construction can also be used in other thermally critical chemical processes.

Specific code welding processes and special fan design features are used too - to ensure complete gas tight integrity. In high concentrations it can be lethal. has a lot of experince with gas-tight and zero-leakage construction on fans and blowers, including: multistage lip shaft seals; Buna-N, Viton and Teflon seals; mechanical shaft seals; special fan housing gasketings; single and double carbon ring seals; hermetically sealed blowers; magnetofluidic and ferrofluidic seals; and packed stuffing boxes with barrier liquids and purgeable seals.: since this support isolates housing from the drive and mounting bases, housing thermal growth doesn't cause forces to be applied to these bases. It occurs in natural gas, oil, volcanic emissions, and some mineral springs.
NISCO also does existing fans and blowers repairs, re-build, as well as dynamical wheels balancing. As to air-tifgt and zero-emission construction, it is used in the following industries:
Hydrogen Sulfide H2S is a main source of sulfur.
Sulfur removal process requires a gas-tight, zero leakage, high temperature and high pressure blower for intermittent duty that must handle toxic gases and must be capable of being brought on line immediately upon demand. These materials are typical for industrial applications requiring high strength alloys and super alloys too.