The weld below was done back in march, this is the heat shield of a catalyst converter in a nitric acid plant. this heat shield is made out of Inco 600. this has been in service since march and it was all new back then. The temperature inside the converter reaches about 1100 F. I am told the...
There is a long lead time to all the equipment made out of 321/347 SS
Is there an alternative material i can use ?
Temp 1250°
Pressure 115 psig
Media Nitrogen oxide gases (Nox up to 10,000 ppm)
I finally ran all or most of the calcs based on the information that is available to me
The NPSHR for the Injection pump is 10 feet attached is the curve. and it's currently operating at 400 psi discharge pressure and 60 GPM
If i eliminate the surge tank and the booster pump and the filters...
Attached is the injection pump curve. at the design condition NPSHA is 10 feet however the pump is operating at a lower operating point ( not sure what is it exactly yet)
So which NPSHA should i consider ? the design or the operating ?
If i keep the booster pump operating to achieve more head...
Yes all the flow go via the pump and filters, it's an environmental requirement to use the filters before pumping wastewater into the ground.
the only purpose of the surge tank is to give enough static head to the deepwell pump so it won't cavitate. otherwise there's no process or...
Hello, in the attachment i hand sketched the current system where i am trying to determine the new NPSHA
currently the 80" water level in the surge tank is providing enough NPSA to the deepwell pump.
we are in the process of replacing the surge tank, so we have to bypass it for the duration...
the plant is really old it's from the 60s however this particular line was replaced back in late 2019 ,this was the last time the flange assembled. this is a fertilizer chemical plant
the flange is not part of a vessel or exchanger it's a 10" piping. the temp is 1100 F pressure 350 psi all CS...
My plant cycled 29 times in the last 18 months, you can imagine how much problems this is creating from downtime and lost production to equipment failure....etc.
One of the problems we are facing is flange connections are getting impacted by all these temperature transitions, thermally...
Thank you guys for all the valuable info and sorry my question wasn't very clear.
We are cutting a flange and replacing it with another flange. this flange being replaced is not on the pressure vessel itself but bolted onto one of the nozzles. does that make it a code weld/repair?
I guess i...
The pump is operating off the curve (curve is attached) at one point the discharge conditions were about 350 psi and 170 GMP then it was sent out to a shop for repair and now the discharge conditions are 420 psi and 85 GPM.
the pump has 100 HP motor
this situation just came up today so i am...
Are there any code requirements or rule of thumbs on what i can and cant do when connecting pipe fittings back to back ?
for example is it acceptable to connect a socket-weld flange directly to an elbow ? or connecting a weld neck flange directly to a reducer ?
Weldstan, thanks for your reply can you direct me to a reference ?
I looked at the ASTM standard specification for A53 but there was no mention of hardness
So I’m not sure where can I find more information
I’m my plant we have a A53 GR. B pipe that was designed for max temp of 750F as per B31.3
However this pipe was exposed to 950F for almost 10 hours
The pipe didn’t fail or anything but we are concerned that the hardness gone above the limits
Is there max hardness allowed for this pipe that...
i am trying to determine if overpressure protection is required in a line due to solar gain.
in other words if solar gain will generate high enough pressure in a line that overpressure protection will be required to comply with code requirements.
anyone has experience with this type of analysis?
