The following excellent articles are from our sponsor Emerson
Process Management.
Pressure
Best Practices - Plants are continuously
challenged to be more and more efficient - deliver more with less.
How can you reduce initial capital costs, improve plant quality,
throughput and availability, while decreasing operating costs?
Pressure Best Practices shows you how to use innovative technologies and
new field practices to increase your plant efficiency
Density
Measurement - Pressure and differential pressure
transmitters are often used to measure the density of a fluid. Both types
of transmitters measure level based on the principle that pressure (P) is
proportional to the level of the liquid multiplied by its specific
gravity.
Interface
Measurement - Differential pressure (DP)
transmitters are used to measure the interface of two fluids that have
different specific gravities (S). To make an interface measurement, the
overall level must be at or above the low pressure tap at all times. It is
important that the level be large enough to create a reasonable DP between
the two specific gravity extremes. This measurement can be done with or
without remote seals. However, from a maintenance standpoint, it may be
easier to use a remote seal assembly; keeping the wet leg at a constant
height can be difficult in some applications.
Eliminating
the Need for Methods of Additional Process Sealing -
According to installation code found in both NEC 501.5(f)(3) and API 14F,
process connected device installed in hazardous locations are required to
have dual process seals in order to prevent flammable or combustible
process fluids from entering the external electrical system - this
technical note discusses a solution for this.
Transmitter
Diagnostics Reduce Maintenance Costs - A
comprehensive article which discusses methods for reducing maintenance
costs.
Specify
the Right Solution for Vacuum Applications -
When a vessel is under a vacuum pressure, it is important to specify the
correct transmitter remote seal system to measure level accurately and
reliably. Failure to do so will result in output drift or complete system
failure. The combination of high process temperature and vacuum process
pressure conditions creates additional requirements when specifying the
transmitter remote seal system.
