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I am evaluating a Revamp project.It requires a 4"x P x 6" safety valve. The inlet line loss is between 12% to 16% of set at actual valve capacity. The Client says the next opportunity to increase inlet pipe size will be in the year 2030. The outlet pipe friction slightly exceeds 50$ of set. The...

I am evaluating a safety valve with low differential pressure Storage drum 10-ft dia by 30-ft S-S. Contingency = Hexane Liquid overfilling Safety Valve Activation pressure = 75-psig which equals vessel MAWP Downstream disposal = 10-psig normal -- nearly closed containment Containment is...

Most Turbine documents have inlet Design Pressure and Outlet design pressure. I don't understand the need for an Outlet Design rating. Is this an actual mechanical casing rating? Is this a pressure at which turbine fails to deliver power? Is this a pressure for bearing loads. Given 120-psig...

Most everyone is familiar with safety valve chatter due to excessive friction losses in inlet pipe. But given a liquid filled system with long piping and the pressure source liquid near (but below) safety valve set, Is it possible to have repeated activation due to hydraulic surge (not friction...

How should someone model the friction loss in a half open gate valve using Crane 410 methods? This is embedded in a PE examination question.

Can someone advise if there is an ASHRAE standard for sizing compressor discharge safety valve. I am evaluating a R-134a compressor purchased in 1999. The safety valve rated flow is sized for about 25% of compressor rated capacity. I'm wondering if this is an ASHRAE standard. My current client...

I'm looking at a set of PID's for a turbine driven pump. The Client has no record files for either pump or turbine. Using 150-psig steam and exhaust to atmosphere, is it reasonable to estimate 150-psig maximum possible pump discharge pressure?

I have a client that operates a rail car facility with 17 folding gangways. Normally the gangways are operated using 80-psig nitrogen from header. For nitrogen outages, the client wishes to use a small portable air compressor. The vision is for the compressor and driver (gasoline) to be mounted...

Can anyone advise a typical Xt factor for Gate valves?

I am a 30+ engineer and am a little embarrased to ask. But how does one handle Q = U*A*LMTD for a Steam Heated Reboiler? The main issue seem to be LMTD determination The process side is a constant boiling temperature. Neglecting steam superheat & steam subcooling, the steam is a constant...

I am currently working with a Client that needs two 2" V-notched gate valves. The devices will be used in in Slurry service to maintain min flow at a centrifugal pump. The required flow is betewwn 60-120 gpm. The process fluid is oil at 580-F and 220-psig. I have two problems 1) What sizing...

I have a client requesting helical baffles for a standard Liquid-liquid shell & tube exchanger. Upon opening HTRI, the software promts for input of a helical angle somewhere between 5-45 degrees. Does anyone know what is a typical angle?

My current Client allows different Environmental credits for external Fire - depending on the type of insulation covering. Aluminum has value "X" and Stainless Steel has value "Y". I'll typically hire a Pipe technician to complete a field survey prior to doing a vessel safety valve evaluation...

This may be a dumb question but is it reasonable to expect a pump discharge pressure to exceed the turbine supply pressure? or stated differently can the discharge pressure exceed 135-psig if the turbine is driven with 135-psig steam?

I am revalidating safety valves at a rail car unloading facility. It has four tiers of structure that contains equipment associated with unloading operations. The facility is isolated. The closest source of flammables is a building 125-ft away. The liquids being unloaded are absolutely not...

I am evaluating a 14"wide by 25"long by 15"tall steel reserviour used to circulate mineral oil through agitator seals. Originally,the unit had a 3/4" breather vent but these were removed (and plugged)because of moisture concerns. The rectangular lid opens with hinges and has two closure devices...

I am evaluating safety valve inlet pipe with tight space constraints for branch bleed valve. It is proposed to bore a hole on a 3" x 4" concentric reducer and then weld a 1/2" NPT half coupling for bleeder valve. The pipe is 150# flange carbon steel. The proposal is for full x-ray of trhe weld...

I am evaluating a 115-ft tall Distillation Tower. In the 1960's it was installed on a previously used foundation. The tower MAWP was 80-psig and liquid level less than 50-ft of water. In the 1990's, the tower was rerated to 90-psig and liquid level less than 5-ft of liquid with 0.56 fluid...

I am involved with evaluation of a 70-ft dia by 45-ft tank with external floating roof. When originally built (1978), the roof rim area has a 6" pallet vent with 1/2 oz set pressure. Today the pallet vent is removed and the connection blinded. The Client feels the pallet device was only window...

When calculating the friction loss associated with a rupture disk, I try to locate acual vendor data. But about half the time, the information is not available. So with no information I will typically use 75 pipe diameters. Recently, I was informed that I should use Kfactor = 2.4 based on ASME...