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Thank you for your quick answer. I kind of agree with you. I have talked to Samson and they said that shorter straight pipe length should also be acceptable but not what they would recommend. The control accuracy may suffer due to this. But they were not be able to give any detail explanation.

Some control valves, like Samson model 3241, strongly recommend that the pipeline upstream and downstream of the control valve should be straight and free of obstructions for a length of at least 6 times the pipe diameter (DN). My questions are: (1) Is this a common rule that people do follow...

Thank you for your fast reply. I already asked the manufacturer before I posted this question. The guy in the instrument manufacturer told me that it would be OK. But I was not sure. I will go back to him and ask for more proof or explanation. I will post more after I find more answers from...

We are considering a instrument that has been certified for MIL-STD-810 Explosion Proof. But I wonder if this means that it can be used in Class 1 Div. 1 or Div. 2 area. Is there any special concern? Does it still need a separate certificate even if it is OK to be used? Thanks.

We have several types of applications. At one application, we have caustic at bottom and hydrocarbon on the top. Guided wave radar sounds like another valid option. How does the RF lelel transmitter comparing to guided wave type level transmitter? Regards,

I have the following questions. (1) Can RF level transmitter be used for interface measurement? If it can, does it require that one phase of liquid is conductive and the other phase of liquid is non-conductive so that one phase is kind of invisible to this transmitter? How accurate will it be...

I have provided the datasheets for selecting the level transmitters for some vessels. These level transimitters will be installed either on the top nozzels or on the bridles of the vessels. I have included the Normal, L, LL, Hi, Hi-Hi ligquid level information. The vessel overall dimensions are...

Sounds interesting, danw2. Our radar sensors are made by E+H. They told me that they could adjust the settings of the sensor to solve this problem. But it has to be done with their technician and when the sensor is having problem in the cold weather. It is not free. I have not asked them to do...

Our oil won't freeze and there is no water in the tank. Tank is vented to the air. The sensor points downward. Do you mean that moisture is condensed from the air at first and it freeze on the surface of the sensor head?

We installed several radar level sensors on the outdoor tanks. They are all identical. The installation location on the tank roof is correct. They worked fine in the summer and autumn. But when the weather gets very cold below 30oF, mostly in the night, they start giving false reading frequently...

Duplex stainless steel is not popular. It seems it is hard to find 2003. We may consider to use 304 SS.

Oil based fluids that are not really corrossive.

Sounds good. Thank you both.

As long as possible. I hope that it will last at least 10-years. The tanks will be put at a ocean port in Africa.

We want to put a relatively big carbon steel tank on the deck of an ocean ship. In addition to coating, some people suggested to use cathodic protection for better corrosion protection. Is this a good practical idea? Is it worth to do? Can you give me a little bit details? Thanks.

We need some large (~1000-bbls) brine storage tanks (outdoor service). But it seems that brine tanks are all FRP tanks. This is not convenient for us and they are expensive. My question is if we can use a welded steel tank plus certain protective coating or liner for this purpose? If we can...

I am trying to design a liquid mixing tank. The mixing tank volume is about 80 cubic meters. We add powders to the liquid. The specific gravity of the mixed liquid is around 1.6. Its viscosity is about 140 SSU. We normally don't use impeller mixer. We recirculation the liquid and use a few...

Thank you, guys. I don't really understand the stray earth leakage and how it will accelerate corrosion to the tank bottom if the tank bottom is not electrically insulated from the ground. There is no any electrical powered equipment sit on the tank, or connected to the tank. There is just...

But our tanks are not stainless steel tanks. They are just plain carbon steel tanks. They are located outdoor without any covers. Besides, is there any difference for case (a) and (b)? Thanks.

We use steel tanks (approx. 14~20ft diameter x 20ft~30ft high) to store the water based or oil based liquid outside on a concrete slab. The water based liquid is not burnable. The oil based liquid is burnable but is not very easy to be ignited like gas or diesel. The steel tank is either painted...