Venting samples
24 Aug 2005
Designated Vent Master, the product creates a constant pressure environment in the vent header to keep chemical/petrochemical process analysers operating at their maximum accuracy.
The new system eliminates the need to vent to atmosphere, and resolves analyser accuracy issues associated with alternative disposal techniques.
Vent Master is compact, fitting into the smallest of field shelters, and is a completely mechanical solution with minimal moving parts - requiring no regular maintenance.
Process analysers require very stable flow and pressure conditions to operate accurately. As a result, process sampling systems are often vented straight to atmosphere - because it provides a stable reference point. But, with increasing clean air regulation, companies are being forced to reduce or eliminate emissions. To comply, the most straightforward solution is to vent analyser samples into a plant's flare path. Unfortunately, the pressure in flare headers can be very variable - adversely impacting measurement accuracy.
Available in sizes capable of handling maximum flow rates up to 18 SLPM - enough to handle the largest of field analyser installations - Vent Master isolates the vent header from the flare path, creating a stable pressure that is regulated to +/- 0.15 inches of water column (~0.0004 bar). Accuracy is maintained for flare header back-pressures up to 20 PSIG.
Vent Master is an all-mechanical pressure control system using regulators, gauges, a rotometer and other controls integrated and assembled in a small panel-mounting enclosure measuring approximately 30 x 38 cm / 12 x 15 inches.
A separate sensitive pressure regulator is mounted directly to the vent header, and connected to Vent Master. For the most common application, flare disposal systems, Vent Master is fitted with an integral eductor and dynamically controls a nitrogen supply to maintain the vent header pressure with a constant outlet flow rate of up to18 SLPM at 1 inch water column (~0.0025 bar). In applications with an existing sample return pump or plant vacuum source, Vent Master provides similar performance without the eductor.
Parker Instrumentation's new Vent Master costs $7250 in its standard form.
