Recent content by ArthurM

There is an ISA 5.1 2022 version out now. If applicable you can also reference the ISO document - ISO 15519-2:2015 Part 2

Changing tuning parameters (adaptive tuning) can be done for varying process conditions, but since this is a start/stop condition it may be easiest to simply bump the output during start/stop. You historically look at where the output needs to be and flag that pre-position during start/stop...

For systems I run in open loop, the output is calculated and I can live with the error. If I can't, feedback is required and I move to closed loop. Once example in power generation is AGC control, where you calculate or measure the site losses (hotel loads) and add to the required generator...

It does come down to distance and price, but don't forget that the distance is dependent on bandwidth. With the faster gigabit speeds in use today, the multi-mode distances have shrunk. That is probably why your IT department has moved to single-mode only. Most new equipment connects at 1...

The initial system design was by Taylor, then bought by ABB. The MOD 300 entered production in 1984. I've seen it in manufacturing as well as power applications. The original Taylor systems migrated from earlier analog and hydraulic controls. ABB has migrated the MOD 300 to their ADVANT...

Depending on site location and requisite code requirements, you may have issues with moving to a magnetic instrument on a drum with that high of pressure. For those following ASME Pressure Vessel Code, PG-60.1 delineates what is allowable. Clark-Reliance is one of the better vendors for drum...

Start with the needed result and work backward. You are often given more information than required, or need to massage (intermediate calculations) the information given. Since you are asked for Proportional Band (PB), start with that equation, which is PB(%) = 100/GAIN. To obtain gain, you...

You will need to make some assumptions, since torque is proportional to the frequency of the rotor current and the square of the flux density. That said, if all you need is running torque, at no more than ~110% of full load, then a linear approximation can be made from speed and nameplate data.

For a basic sizing calculator, that is free, you can use this website: http://www.pipeflowcalculations.com/orifice. However, all vendors will perform the same thing, generally free of charge, if you ask them. They will also push you for pertinent information that you may not include...

First off, the distance limitation published for RS-232 (EIA-232) is one of capacitance, and is set at 2500 pF. Since most early cable had a 50 pF capacitance per foot, that set a limit of 50 feet. Now most cable runs around 12 pF per foot, so the capacitive limit would be a bit over 800 feet...

I had an interface written years ago to connect a GE turbine control system to a DCS via SRTP (could have tried GSM as well, but decided against it at the time). The DCS vendor was able to get all the pertinent information from GE to make this happen, so it was available......around 2001 anyway...

Your density calculation is correct, for a gas density at the stated temperature and pressure. Your second answer is at STP (SCF, not CF), and if you perform a conversion to 60F and 14.69 psig (STP conditions), you will obtain the other answer.

The issue has to due to the impulse tubing from the process taps to the DP transmitter. Since variable liquid levels on both sides of the transmitter will affect the differential pressure reading, you need to ensure one side remains constant. That side is called the reference leg, and a...