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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)

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...

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...

What is code weld and when it's needed ?

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 ?

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?

My vibration analysis guy asking me for the phase angles of a reciprocating compressor. I think it has to with the crankshaft position and speed

Can someone explain to me what are the phase angles of the crankshaft in recip compressors ?

tube bundle for ammonia vaporizer heat exchanger made out of SA-179 normalized and annealed (HRB 66) we have been having corrosion problems alot due to the low PH of the water due to nitric acid carryover is carburizing case hardening would help? or nitro-carburizing?

the PSV outlet relieves to the atmosphere, so immediately i know the backpressure is 0 psig however the outlet pipe + fitting will develop a pressure drop of 120 psig my question is, what is my backpressure ? is it 0 or 120 ? API 520 1.2.3.3 (J) built-up back pressure is the increase in...

this has been a long standing problem of PSV leaking, the PSV is installed directly on a pump housing at discharge, the PSV has been leaking and get replaced every month or two on an average. the PSV never lifted, it just leaks. there was never a detailed RCA done on this but the recommendation...

the service is ammonia and the max temp is 200°F but the set pressure 3900 psi not sure why this PSV is using metal seats? why can't just use soft seats ? Is there any other deciding factors beside temp and chemical compatibility?

Can i re-classify/re-certify a sec I boiler to a sec VIII pressure vessel ?

i have 3 Identical interchangeable PSVs on one P&ID, they are installed on the same line ( pump discharge line) all 3 PSVs have the same size, class and set pressure. they are even the same manufacturer P/N my problem is those 3 PSV's have 3 different tag numbers/Part number on the P&ID which...

which ASTM standard shows the mechanical and physical properties for 4140 and 1018 I am looking for SMYS info but can't find.

I know this is a basic question and i should know the answer but I just need one quick and solid confirmation to put his subject to bed. External cavity relief is only needed in the DPE x DPE configurations in trunnions ? correct ?

I searched for similar questions but i couldn't find a clear answer. I have a 1" floater ball valves size and the operating pressure will be (-15) psig on one side and atmospheric on the other side is this going to work? thanks in advance. seats are teflon and stem seals type is packing