DDI01 DDI03 DDO01 DDO02 ABB DCS power module

DDI01 DDI03 DDO01 DDO02 ABB DCS power module

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For some NGC installations, it may be necessary to install an optional sample

system conditioning module to compensate for non-ideal natural gas samples.

These optional modules are pre-engineered to provide various levels of protection

and bypass flows (see Figure 1—22). All of the sample conditioning modules

include a level of particulate protection and come in two flow sizes: 50CC

(2102023-xxx) and 450CC (2102024-xxx) per minute (see Table 1–10).

For installations where the gas is ideal and the sample probe is located less that

10’ from the NGC, no sample conditioning module is required.

1.17.1 Gas Types

The user can select from one of four sample conditioning modules for installations

whose gas samples do not meet the ideal clean and dry conditions. The following

definitions define what is meant by the condition of natural gas to be sampled.

• Clean gas is defined as having no particles larger than one micron and no

more than one milligram of solids per cubic meter of gas.

• Dry gas is defined as having no more than seven pounds of water per million

cubic feet of gas. Gas has less than 0.1 PPM of liquid at the coldest ambient

condition expected at the coldest point in the system. The liquid can be water,

oil, synthetic lubrication, glycol, condensed sample or any other non vapor

contaminate.

Stable gas is a vapor containing less than 0.1 PPM of liquid when vapor is cooled

to 18.3°F (10°C) below the coldest ambient temperature possible at any point in

the system.