When used in sulfur vapor service, switching valves can stick and leak due to formation of solid sulfur inside the valve. Sulfur vapor valves are recommended for the following applications:

The solution

Bubble testing a sulfur vapor valve.

Sulfur vapor valve assemblies. Trouble-free operation for sulfur recovery and tail gas cleanup systems.

The problem

→ Claus sulfur recovery unit (SRU) warmup → Cold bed adsorption (CBA) SRU process switching → Claus SRU tail gas block valves

→ MCRC SRU process switching → Tail gas cleanup unit (block valves) → SULFREEN process switching

Design

Linde Engineering North America Inc.6100 South Yale Avenue, Suite 1200, Tulsa, Oklahoma 74136, USAPhone +1.918.477-1200, Fax +1.918.477-1100, www.leamericas.com, sales@leamericas.com

Linde Engineering North America Inc. (LENA) has a solution to the problem - a unique steam tracing design. The sulfur vapor valve assembly designs are integral components of sulfur recovery and tail gas cleanup systems. The assemblies provide trouble-free operation, are tested to pass a bubble tight shut-off test or better, and can withstand the harsh operating conditions of sulfur vapor service.

An assembly consists of a standard high performance metal-seated trunnion valve modified and jacketed according to a proprietary design, special steam-jacketed spool pieces, and interconnecting steam lines ready for installation into the piping system. The valves can be equipped with either manual gear or pneumatic actuators, limit switches, and solenoid valves. The steam connections on the assembly are designed to allow all threaded connections to be located outside the user-supplied external insulation.

Standard valve assemblies are available from 6 inch to 36 inch pipe sizes. Larger sizes may be special-ordered. The standard assemblies can be designed for horizontal or vertical piping configurations, and can be provided with corrosion resistant materials for higher temperature service.