We have a mixture of isolation valves in our plant for Hot Oil (CALFLO). Triple offset butterfly, globe (Y and std), and gate. For pure line stop valves would you chose Butterfly, Y globe, or Gate? Oil runs at 550F
Sorry if there's another post relating to this. I searched but couldn't find any. The vast majority of chemcial sites that i've been to or worked at use flagned 150# stainless ball valve with some form of soft seat for process lines. One site I visited is using plug valves for process instead...
I need to replace an older Hot City water piping system. Water is heated in a storage tank and piped to vessel jackets for heat. Temperature of the system is 75C. No treatment chemicas are added as this water is used for vessel cleaning. Its currently galvanized pipe. At previous sites...
If I'm reading the code right I'm required to do a functional test of my PSV every 2 or 3 years depending on class. Can someone help me out of the functional test? For or reactor PSVs we send to a VR facility every year for testing but for steam, nitrogen, and air we test by lifting the handle...
I got one. I have a ASME code pressure vessel with a dimple jacket. The jacket was assumed to be rated at 75 PSIG @ 575F MAWP, but the U-1 indicates its 45 PSIG @ 575F. Is there a process to get the jacket rating increased?
Currently my company uses ASTM A53 Grade A for all steam and condensate service. Our main boiler pressure is 130 PSIG. Can someone help explain to me why you would use one or the other and if ASTM A53 Grade A or B is acceptable for my application? My previous company use ASTM A106 for steam...
We exclusively use RTDs at our site for temperatures measurement. For 75% of the time we have an associated transmitter, but for our older facility we have RTD going straight back to the DCS IO Card. So for ISO reasons we have to calibrate each RTD each year. For the transmitters we simply...
Well I'm trying to find some information on why I would use malleable vs forged CS fittings. Our current piping specificaion for general water service uses ASTM 53 grade B pipe and malleable fittings. Can someone please tell me when I should and should use malleable vs forged CS fittings. Thanks
Currently my plant uses interchangeably malleable iron and forged CS fittings. I was wondering if someone could help explain the advantages and disadvantages of both. Why would you use one over the other when the pipe is ASTM 106 or ASTM A53 Grade B.
I was just checking to see if anyone owns Pocket Guide to Chemical Engineering or Rules of Thumb for Chemical Engineers by Carl Branan. I get a little tired of hunting through my Perry's and would like to get a more condensed reference source. My colleague recommend Pocket Guide to Chemical...
I hope someone can help settle the debate here... We are a PSM covered site and anyone who welds on process lines has to be a "certified" welder, but what are the rules around "certified". I know you can send out for the independent testing, but can field welding with pressure test pass for...
Need a little help. We have a process to esterify a alcohol and acid. The alcohol is in excess. The reaction temperature is ran above the boiling point of the alcohol so it carries over to the receiver. Since we generate water with the reaction we have to fill up the receiver with boiled...
Help....I know how to calculate the expected mixing time for a material blend, but my customer is asking me for the mixing turnover time in my vessel. I don't know that I've ever tried to do this. Anybody know how. Nothing funny about my system. 6500 gallon vessel with 4 baffles, bottom...
I haven't calculated this in a while and I can't find it in Perry's. Does anyone have the equation to calcuate shear rate in an agitated vessel based on viscoisty, RPM, impeller size type, etc...This is a great site.
I'm trying to calculate the requried mixing HP of a current mixer. This is in a baffled reactor with a 2 blade visco prop. I'm going from 100 cP to 500 cP and need to make sure the current motor HP is still adquate. I've looked in my Perry's, but I don't remember how to do it. Any help would...
