Problems with the sampling port

Here are my thoughts, for reference only: A 6-inch stainless steel pipe can be welded onto the pipeline (the length shouldn’t be too long; it depends on your specific circumstances). Add a ball valve to the head. A branch line with a ball valve can be welded to the side; after the ball valve, there is a reduction in diameter that connects to the rubber hose (if necessary, a swivel joint can be added between the ball valve and the rubber hose). In the event of a blockage, the ball valve can be opened by passing a wire through it. If the side passage is blocked, the joint can be removed and cleared with wire. Close the valve after sampling.

We use a DN10 stainless steel sampling port, equipped with a sampling cooler and separator at the front. The sampling point is equipped with a root valve, which must be closed after each sampling.

(1) The sampling tube should be as short as possible; the longer the tube, the more fluid will remain in it, and it is necessary to drain this retained fluid during sampling. (2) The outlet of the sampling tube: (a) When the sampling tube is led out from a vertical pipe, the direction of exit should be such that it suits the layout of the sampling tube. (b) When the sampling tube is led out from a horizontal pipe, it should be led out from the upper or side part of the pipe (applicable only to horizontal pipes with DN≤80). (c) The sampling tube must not be led out from dead zones in the pipe. (d) If the length of the pipe from the cutting valve at the sampling point to the outlet exceeds 3 m, a gate valve should be installed at the nearest point to the outlet; this length shall not exceed 8 m. (3) The cutting valve and the sampling valve should be placed at least 300 mm apart from each other; when there is a sample cooler, the cutting valve should be positioned near the nozzle of the sample cooler. (4) When the front end of the liquid sampling nozzle points downward, there should be at least 300 mm of clearance below the nozzle

I don’t know what the structure of the ball valve is like, or whether it might get clogged Our blockage is very severe!

It’s good to have a separator, but it means adding another piece of equipment, which increases the costs significantly! Actually, we also have gas washing tanks, but tar can still cause blockages!

These are mainly for liquid sampling, right? We deal with gases, so it’s a bit different! The pipeline is also quite long, as it has to be pulled down from above!

If the gas temperature is not high (below 100 degrees), a regular ball valve can be used directly. It’s easy to find in the market. The price isn’t expensive either. If replacing the valve is easy, one can be used; if it is difficult, two can be used in series. During normal use, use the outside one. The one inside doesn’t move. If the one outside is damaged, close the valve inside. Replace the external valve.

Add a T-shaped tee in the areas prone to blockages, and install ball valves at both ends of the tee – one for sampling and the other for clearing blockages. This will basically solve the problem; this is how we have always done it.

I’m not very familiar with valves, but it should work based on what I’ve heard! Thank you!

Our company’s sampling ports are equipped with upper and lower needle valves for gases; during sampling, these valves are opened to allow the gas to be replaced, and they are closed again after sampling is complete. Only in this way can representative samples be obtained. All of this is carried out in a fume hood, which is better for those who perform the sampling and analysis

Your company is really human-centered! Hehe! We are going to the site to take samples!

Change the sampling point location; for the semi-analysis of gas, the sampling point should generally be placed directly above the pipeline behind the dust removal device.

For our gas sampling port, we install a ball valve below the pipeline pressure gauge; when sampling, it is necessary to release any remaining gas from previous uses. It’s advisable to use a wooden cabinet, equipped with an exhaust fan, to prevent poisoning during sampling. After sampling, turn off both the valve and the exhaust fan. If clogging is a problem, place the sampling port behind the dust collector

The gas sampling ports in our factory are also blocked. I think a ball valve should be installed at the connection point between the sampling tube and the pipeline, so that even if there is a blockage, it will only affect a small section

Thank you all for sharing; I’ve come here to learn*. Thank you:handshake