Siemens GC..M.. Manual de instalación descargar pdf (Pagina 27)

Sampling System Installation

Siemens Supplied Sample System

The sampling system provides a conditioned process sample to the analyzer. This section is intended to

provide guidelines and is not intended to be a comprehensive installation procedure. Be sure to follow

local and national codes with regard to the installation of this equipment. If the sampling system was

provided by Siemens, then references will be given to link to the custom documentation package. Refer

to Application Drawing Package, Sampling System sheets for information concerning sampling system.

CAUTION Sample filtering is required to protect the sample valve from contaminants. Refer to

your custom documentation to check on the requirements for your system. In some cases these

are installed at the factory.

Siemens sample systems typically receive process samples from the transport system at 0 to 250°F (-18

to 122°C), and at 5 to 250 psig (34 to 1724 kPa) for gases, or 15 to 250 psig (103 to 1724 kPa) for liquids.

The process line selected for removal of the sample should have these characteristics:

 A horizontal run

 Containing a single sample phase (either all gas or all liquid)

 Close to the analyzer

 Reasonably protected from mechanical damage

 Reasonably easy to access for installation and removal of the sample probe.

Sample Probe Installation

To install a sample probe, use an existing full-port gate valve, or weld a half-coupling on the process line

and attach a 3” (7.6 cm) long schedule 160 nipple and gate valve, then hot-tap into the process line. The

probe can then be attached to the gate valve by a reducing bushing and a suitable packing gland. Refer

to Application Drawing Package, Block Diagram Utility Connections sheet and Sample Probe sheet.

The sample probe should be long enough to be inserted to the process pipe's centerline, or at least 4” (10

cm) past the process pipe's inside wall. The probe should be cut off at the valve end to leave a maximum

of 1” (2.5 cm) of tubing between the packing gland and the shut-off valve when the probe is fully inserted.

This decreases the chance of bending or breaking off the probe tube.

Additional Equipment

Additional equipment associated with the probe, such as a regulator and vaporizer, if required, is

attached with a U-bolt bracket connected around the 3” (7.6 cm) long nipple upstream of the process gate

valve. Refer to Application Drawing Package, Block Diagram Utility Connections sheet and Sample Probe

sheet.

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 43 44

Sin comentarios

Siemens GC..M.. Manual de instalación Pagina 27