Many thanks IRstuff and sorry for the late reply.
It's seems that I was heading in the wrong direction...
It's true that it's the Process accuracy requirement (Customer requirement as you call it) that matters to define the tolerable measurement errors.
I was trying to start from an existing...
The following standards might help:
EN 472 : Pressure gauge - Vocabulary.
EN 837-1 : Pressure gauges. Bourdon tube pressure gauges. Dimensions, metrology, requirements and testing.
EN 837-2 : Pressure gauges. Selection and installation recommendations for pressure gauges.
EN 837-3 : Pressure...
Some process instruments such as PT (pressure transmitters) demonstrate an accuracy of 0.1% or 0.2% (depends on the technology of course). I understand that to calculate the overall measurement error of the measurement system (measurement system: PT + impulse line + Valves + PLC input module +...
Many thanks thost
Do you know where I can get those monoflange DBB valve with 2 metal seated ball valves (suggested manufacturers if the Forum allow it) ? So far, I could find only resilient seated ones.
If this solution is adopted, the instrument maintenance procedure should describe clearly...
Again, many thanks for both of you. Always good to see things from different perspectives.
Indeed, metal seated ball valves seem be to be a better fit for the application than the soft seated ones. I was looking for an inherently safe design (Full DBB) but it seems to me now that it's difficult...
Thank you all for your replies. I really appreciate it.
The instruments where we have this issue are used for high pressure (75 Bar) and with fluids such as amine or hot oil. The EPC contractor installed those monoflange DBBs for energy isolation. The monoflange DBB are relatively small and...
Hi,
In our gas processing plant and for many DP cell flow instrument, we frequently experience clogging of instrument DBB valves (double and Bleed valves)due to debris being present in the process fluid. Those are monoflange DBBs with three needle valves (two as block valves and one for...
Thank you all for your suggestions.
As you proposed, I'll try to get in touch with Density or conductivity detectors supplier in order to get accurate information about the suitability of the solution and the constraints that I need to take into consideration in the design.
Again, many thanks...
Thanks gerhardl, it seems to be a great Idea (I drew a sketch based on it).
However, I am wondering what would be the best technology to use to detect density. Reliability and maintenability of the instrument is really a concern for me.
Regarding the actual conditions, I still don't have all...
Thank you ash9144 and gerhardl for these valuable information.
I think now that a liquid drain trap is definetly not suitable for this application. I even asked Spirax Sarco, I got the same answer. So, I am comfortable with this decision. Thank you for that.
Moreover, I was wondering about a...
We have a storage tank for gas condensates in our Gas central processing facitliy. We are facing some difficulties to drain only water from the tank without draining Gas condensates (Liquid). Hence, we loose significant qunatities of gas condensates when the operator drains the tank manually.
I...
Thank you very much,
In fact, the gasket type is already determined according to our design conditions (Pressure, Temperature, Fluid). We've taken into account these parameters and checked them with the manufacturer's (George Fischer) solutions. Each solution has its own requirements regarding...
Hi everybody,
I want to know how to determine the bolts material for a plastic flange connection (PE100, or simply polyethylene). Actually, this connection is done by using stubs and backing flanges. I know that the material will define how much torque the bolt can withstand (As well, the...
Great!
I would like to thank you all for these valuable information.
I am studying all these possibilities (Using Spacers, pull a liner through the pipe, Resistoflex Field kit, etc.) to understand the pros and cons for each solution.
After that, I think that I will probably have more questions...
Hello,
I would like to know how to install plastic lined steel pipe in a typical process.
Is it true that Lined pipes must be purchased premanufactured by specifying precisely the lenght of each unit, beacause it is impossible to cut the pipe the right lenght on site (Can Affect the plastic...
