Recent content by Weegie

Hi. Please excuse my ignorance here. My forty years experience lies with field instrumentation wired back to plc's or DCS systems. I have no idea however, how a plc can talk with a dcs and vice versa. Can anyone please help me with a nut-bolt explanation of what's used (hardware & software) or...

Our control valve data sheets show (limited) process data as follows:- Temperature - norm/max Inlet press - norm/max Min. flow @ DP Norm. Flow @ DP Max. Flow @ DP My question is, what pressure & temperature numbers should be used to calculate the valve cv ? For min flow cv, I would use normal...

I'm working on a sulph acid plant project (instrumentation group)and on one of the P & I.D's, a section of process line is called out as B31.1. This line is hp steam. The other ends of the process line is tagged as B31.3. (Typical of all our P & ID's) On this B31.1 line, I've noticed that drain...

I'm working on a sulph acid plant project (instruemntation group)and on one of the P & I.D's, a section of process line is called out as B31.1. This line is hp steam. The other ends of the process line is tagged as B31.3. On this B31.1 line, I've noticed that drain valves are double block and...

Apologies there. I did mean an ethylene glycol mix. There also used to be a commercial barrier fluid for purchase for these type of applications too but, I can't remember the brand name. I've never seen capillaries being heat traced. Your choice of capillary fill fuid would be chosen to suit...

Many refinery instrument maintenance crews in cold climates use ethylene glycol as a freeze protection/barrier fluid in impulse lines for frost protection & keeping the process fluid out of the transmitter/manifold assembly. As you most likely have a 'high' & 'low' pressure filled impulse...

The annubars are 'averaging Pitot Tubes' (APT).

Jake, much obliged for the guidance and info. Having spoken with a couple of our vendors, they then made me aware of their website calculators for the annubars. Best regards, Danny

Ione, much obliged for the formula. best regards, danny

Just an update. One of our vendors (Endress & Hauser) directed me to an online interactive annubar calculator on their website. Unfortunately, there's no direct link so, you have to drill down a little to find it.

thanks Ione but, not what I'm looking for. I have similar calculators but, I'm looking for a program that will calculate the thickness of the RO plate based a known pressure drop. If you need a good free down loadable FE/RO calculator get the DG2floCalLite. It's a great program ...

Would anybody happen to have an (Excel based) RO plate thickness calculator ? (My work's computer was recently upgraded and I've lost the one that I had.) Thanks.

Cheers Dave.

Much obliged Dave. Best regards. Danny

I'd take a look at the vessel vendor drawings. your mechanical engineer/department will have specified a centreline elevation of the flange/tap connection for the switch/device. If the vessel is already in service, check with the plant operators and ask what the ESD level is set on the plant...