Inline Sampling for Multi-Phase Flow

摘要

A sampling device uses two ball valves that may be operated to take a sample while allowing flow to continue in a bypass path in a pressurized pipe. As one ball valve closes, it may capture a sample of liquid and gas that may be traveling in the pipe, then the sample may be discharged through a sampling outlet. The second ball valve may be operated simultaneously to open a bypass path while the first ball valve captures a sample. In some cases, the speed of actuation may be a function of the flow speed to capture an accurate sample. In other cases, the length of pipe from the sampling valve to the bypass junction may determine the effectiveness of the sample when actuation speed is relatively slow.

主权项

1. An apparatus comprising:
a first ball valve having a first position being an open position, said open position having an internal diameter through which flow occurs when said first ball valve is in said first position, said first ball valve having a second position being a closed position; a second ball valve having a first position being an open position, said open position having an internal diameter through which flow occurs when said second ball valve is in said first position, said second ball valve having a second position being a closed position; said first ball valve and said second ball valve being configured such that when said first ball valve is in said first position, said second ball valve is in said second position; a mechanism that causes said first ball valve to change from said first position to said second position while said second ball valve changes from said second position to said first position; a sampling port on said first ball valve that drains said internal diameter when said first ball valve is in said second position; and an inlet junction upstream from said first ball valve and said second ball valve, said inlet junction comprising an input connection and a first connection to said first ball valve and a second connection to said second ball valve.