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Hi, I am performing a temporary modification to create a tie-in to an existing cooling water system (150 psig, 100C) involving adding a small booster pump (operating point at 20 psi, 11 L/s) in a branch circuit (3" line). I plan to use the existing system design pressure and temperature for...

Hi, I read about that when a fan + motor runs inside an air stream, the fan heat into the conditional space is equal to the electrical power input. I am trying to understand this concept. If the electrical power input is 10W, then say, 1 W goes to heat as motor loss, and 9 W goes to produce...

Hi, I would like to ask what is an acceptable NPSH margin in the industry. I have a pump in an open system that is for accident mitigation purpose. Therefore, should I specify a higher NPSH margin like 50% above the NPSH required. What will happen if the pump runs below the NPSH required...

Hi all, I have two pressure indicators; one in the suction and the other in the discharge sides of the pump. I would like to find out the flow rate of the system. The questions that I have are: 1. Does the DP measurement across the pump reflect accurately to the overall system pressure...

Hi, I would like to acquire information on the selection of N2 cylinder (size,pressure rating, temperature etc) and the necessary components such as pressure regulator. The application that I am dealing with is to use N2 to pressurize an accumalator up to 70 psig (N2 on one side; water on the...

Hi, I would like to gather information about factors to consider when plugging the HX tube. What are the factors that I should considered? The HX is a low pressure and low temperature (<70C) application. Thanks

Hi, I would like to acquire information about slug formation in process tubing. My concern is if we need any additional support at the end of the tubing due to the momentum force generated under this scenario. I had some small tubing connected to the secondary side of the boiler at (P=700...

Hi, I am working on a study to determine the peak pressure and temperature as a result of a steam discharge (T= 300C, 500 kg/hr)into a CO2 low pressure circuit with the compressors operating at P=11 psig and Q=5 L/s. I am thinking about using saturated steam (P =1 atm T=100C) for the...

Hi, I am working on a study to determine the peak pressure and temperature as a result of a steam discharge (T= 300C, 500 kg/hr)into a CO2 low pressure circuit with the compressors operating at P=11 psig and Q=5 L/s. I am thinking about using saturated steam (P =1 atm T=100C) for the...

HI, I have an instrument system with design pressure of 240 psig. The helium tank has 3000 psig, and a PRV located downstream is set at 70 psig. A relief valve is located further downstream of the PRV. I was wondering what are the factors to determine the set pressure for the Relief Valve...

Hi, Where can I find the design pressure and temperature of a Stainless Steel ASME Nuclear Class 3 150 lb 1/2" Globe valve? I am looking from the pressure boundary prespective. thanks turbineblade

Hi, While I was reading a flowsheet, I came across with a gate line with an equalization line? While the gate valve is closed, how does it equalize the upstream and the downstream pressure without bypassing any fluid? Thanks

Hi, Just wondering if anyone has experience with HTRI Xvib software for HX flow induced vibration? Is this a good software for analyzing flow induced vibration? Thanks

Hi there, I am gathering info to understand the issues of gas-locking in a pump. What cause gas-locking, typical scenario of a gas-locking in a plant application, methods to prevent and mitigation etc. Thanks

Hi, I have a split flow tube and shell HX that is subject to potential vibration problem due to design deficiency. The secondary side flow is designed to 600 L/s. Right now, the plant is operating at much lower flow to avoid the vibration problem. What are some of the potential solutions to...

Hi, I have a standby horizontal split case double volute pump in my system. When maintenance is perform in the sytem, there will be some reverse flow. Right now, some design modification is needed in the system which may result in an increase of the reverse flow. I am not too sure if this is...

Hi, I am trying to understand waterhammer problem in a process system with focus on void formation and column separation. Can anyone suggest a good source of information/books? The system is re-circulating water; fluid travel in a U-shape loop circuit, reaching at the highest elevation of 25...

Hi, I am having problem inputting the temperature value with unit in MathCAd V13, For example T1 := 13 deg C. Mathcad prompts an error that "This value must be scalar" On anside, how do you attach a bmp.file in the thread? Thanks

HI, I came across with a pump + Heat exhanger closed cooling system having the following service conditions in the flowsheet: At the Pump Suction: Normal: T= 140 F P = 10 psig Design T= 200F P = 100 psig At the Pump Discharge: Normal: T=140F P = 90 psig Design T=200F P = 145 psig The...

Hi, I would like find info about manual gate valves for isolation purposes. The gate valve spec. is Class 300 lbs SS body BW Sch40S Man Operated. The design conditions are T=200F and P=180 psig, in water. The Cv required is 3100. I came across with a similar spec that uses a trim...