We are trying to update our policy at our plant for welding. I'm struggling with when do I need a certified weld inspector and a certified welder.
For example, do I need both a certified inspector and certified welder to weld a piece of unistrut for a simple repair?
Should the engineer...
We store 36% HCL inside in one of our processing buildings. The scrubber had leak and we off gassed HCL through the building. This has caused the galvanized conduits and piping to rust plus coat MCC. We taken samples on the inside of the MCC and no evidence of HCL. My questions are do I...
Does process piping or instrutmentation tubing or hydraulic tubing fall under IPC? Our inspector is saying our process piping that could go to a reactor or the instrumentation tubing going to a gauge or process vacuum piping or hydraulic tubing should be inspected per IPC. Is this true or is...
We are writing standard at our plant for proof testing hydraulic systems. These are mainly hydraulic power units piped with stainless steel tubing operating a cylinder or a hydraulic motor in the field. Currently the standard states that the system needs to be proof tested a 125% of maximum...
On our plant, we have a bay with an air handler plus unit heaters. This past winter the coil on the air handler froze. The reason is because it’s modulated steam going into the coil with the main condensate return being 42” above the return on the coil. Because of this situation, there is not...
I have a situation that I’m trouble shooting. We have process where are trying to maintain some small process vessels at 100 degrees F. The process is a closed loop water system running through a shell & tube heat exchanger which is heated by 15 psi steam on modulating valve. The centrifugal...
I approve drawings from Contractors/Vendors. I'm trying find out how drawings are being approved electronically and what does your approval block look like.
Thanks
We are in the design phase of modifying a deluge system at our plant. Our plant operations group would like the deluge system to be install on a grid. This grid will be very flexible. Operations will have work cells with hoses hooked to different drops on the grid. During a typical work day...
One of our millwrights recently rebuilt a load brake on a 10 ton hoist at our plant. The new discs called out were non-asbestos. Because of this the oil in the load brake was changed from 150 wt to 100 wt. Since this was rebuilt occassionly a rumbling noise could be heard from the load brake...
We have a 5/16 SST hex head bolt that keeps failing because of fatigue at our plant. The bolt is a ASTM A593C. I can't remember how much increasing from a 5/16 to a 3/8 will increase the fatigue strength and I don't what hex head stainless steel bolts are available in higher strength.
Any...
We are installing a 3 ton explosion proof bridge crane here at our plant. The area is rated Class I Division 1 Group D and Class II Division 1 Group F & G. According to the NEC the cabling should be rated extra hard usage. This would be like SO cable. We would like to use a festoon system...
I've got a project that requires us to do full penetration welds and surface inspect welds on the inside of stainless steel pipes. The material going through the pipe is an explosive. I figured that dye penetrant inpsecting is out because a person can see back inside of the pipe. Will X-ray...
I'm trying to trouble shoot an air over oil lift system. We pressurize a cylinder using about 90 psig plant air. The system has two air over oil tanks, a directional valve, and two pilot operated check valves between the tanks and the cylinder. The system will operate fine for a while but...
At our plant we are refurbishing a mixer that we use to mix our propellent. Part of the reason of the refurbishment is because the paint is flaking off in some areas in particular this part the mixer carriage. We can't allow any paint flakes in our process. The mix bowl is slid into the mixer...
We are starting a new process using liquid ammonia. The tanks are 2' diameter x 7'long. We are bring the tanks into our process bay and then hooking up the tank. We have brought a trunk line next to the tank to ventilate any ammonia gas. Our plant industrial hygiene now wants us to install a...
I asked the manufacturer of chemical reactor at our plant what's the Reynolds number at 60 gpm. The manufacturer replied back at 60 gpm the reactor has an overall heat transfer coefficient of 75 KCal/m2h degree C with a pressure drop of 0.28 bar. I'm trying to back into the Reynolds number but...
I'm trying to size a pump for a heating and cooling application for a chemical process. They need about 80 gpm with 275-300 ft of head using 55% ethylene glycol. The temperature range is 0 degrees F to 135 degrees F. I've been looking a centrifugal pumps but keep ending up at the top of the...
I'm trying to size a pump for a 3-way control converging flow valve setup. I have three 3-way control valves in series. The ethylene glycol either goes through a heat exchanger and across the valve (Right to Left) or goes around the heat exchanger and across the valve (Bottom to Left). I gave...
I've install a closed loop heating and cooling loop to a 500 gallon reactor. The system has three 3-way control valves in series with 3 separate heat exchangers. As the PLC calls for different temperatures the flow will either go through the heat exhanger or around it depending on the...
I've got a project where we are retrofitting an existing heating and cooling loop going to 500 gallon reactor. The chemical engineer that I'm working with designed it with three heat exchangers piped in series with a 3-way mixing valve between each heat exchanger. The system is designed so...
