Read the summary and the most important questions on Design of Sample Conditioning Systems | Shell Global Solutions

• 1 Introduction

• what are the main sub-systems of a sample handling system?

  a sample handling system comprises four main sub-systems: sample take-off arrangement; sample transport system; sample conditioning system; sample return and/or sample disposal means

• 2 Sample Take-Off Arrangements

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• Where should a sample probe be located for a liquid samples?

  Side of process line with arrangements for unplugging and flushing sample lines.

• Where in a pipe should a sample probe be located?

  Within the middle third of a pipe to avoid slower slipstream near pipe wall and any pipe wall effects like rust or memory effect.

• Who decides sample take off location?

  Joint decision between analyser and process technologists, to ensure a reliable fit for purpose design.

• 4 Time Lag Calculations

• The primary fast loop transport lag is derived from what?

  The primary fast loop transport lag is derived from a) the available differential pressure; b) the length of the sample piping; c) the line sizes; d) the sample viscosity

• 4.1 (a) Calculation of primary fast loop transport Lag Tb (Time lag in the supply line Ls)

• What is the first determined to calculate the primary fast loop transport lag?

  The equivalent length of straight pipe is the first determined.

• 4.3 Example Time Lag Calculation for a Gas Sample System

• What are constituents of a gas sample system time lag calculations?

  The gas sample system time lag calculations constituents are the calculation the time lag before vaporizer/reducer and time lag in transport line.

• 4.4 Time Lag Calculation using Software

• What shall be done when using free software calculations for the first time?

  The results must always be crosschecked using nomogram based methods or manual calculations when using free software calculations for the first time.

• 5 Sample conditioning Components and Systems

• What the sample conditioning has to do for liquid samples?

  the sample conditioning has to do for liquid samples following: liquid/solid separation using filtration equipment; liquid vapor or gas separation using vaporising regulators, cyclone separators; liquid/liquid separation using coalescing membranes.

• 7 Typical Gas Sample Conditioning Systems for

• 7.2 Density Analyser

• when was nesse developed?

  1998