Recent content by NPC5

I have been performing a cooling water system calc in Excel. The system is being pressure balanced using butterfly valves. I have always heard that in real life it is incredibly difficult to actually balance a cooling water system this way. I am wondering if the calculations that I am performing...

Suppose that I am looking at a water knockout drum. I have a stream coming from a tower at 225 F, going through an exchanger being cooled by cooling water down to 100 F and entering the water knockout drum. The exiting streams are the two separated process and water streams. I have set the...

I have a question about line list conditions for condensate lines. Say that there is a 50# saturated steam line, and steam trap, and then a condensate line that is feeding into an open sewer. I have seen two types of conditions listed for the condensate line. One way shows the condensate line...

Is there a method in choosing what sort of pump to pick when specifying a pump? Between bearing would give more support to the shaft? Are these chosen for larger pumps? Any help would be welcome. Thanks in advance.

Bradshsi, in what ways does the pump suction pressure affect the seal heat generation and life? I don't have much experience with pumps and would like to learn as much as possible. CJKruger, do companies want the external flush to be able to enter at maximum suction pressure for any specific...

Bradshsi, Thanks so much for your help. I am actually looking at the design of the barrier fluid being used. The seal flush plan, flush fluid, and barrier fluid have all been designated. I am in the process of working with the pump vendor to determine he barrier fluid supply pressure needed at...

When designing pump seals, how does the max suction pressure come into play? In the case that the pump is able to see max suction pressure I suppose you would be concerned that a seal would fail and the process fluid gets exposed to the atmosphere? What sort of scenarios should one be aware of...

I have been wondering about how design conditions are set for pieces of equipment. I believe that design pressures are usually related to the shut-in pressures of upstream pumps right? But for design temperatures I am always seeing values that far exceed any operating conditions. For example a...

Thanks for the help zdas04 and sheiko!

If I have multiple streams of cooling water exiting exchangers, combining and returning to a cooling tower, what would be the quickest way to estimate the temperature it would be when it reaches the cooling tower. Is it sufficient to simply do a ratio type thing i.e. [(temp1 * flow1) + (temp2 *...

That's right...I always have the same problem as zdas04. Thanks a lot Katmar.

Please if someone would help with a sanity check. Converting from standard cubic feet per minute to actual cubic feet per minute is simply the ratio of densities right? i.e. scfm/standard density = cfm/actual density. I have been checking some process data and my numbers do not match with what I...

Does anyone know a quick method of calculating the condensate load for a line steam trap? I am looking at a 16" line flowing 50 psig saturated steam with drip legs and steam traps located every 100 feet. Thanks!

Thanks a lot for the help. Europipe, the line eventually ties into a 150# header so I had to put a break somewhere.

I have a line coming off of a 300# spec line, a block valve, another block valve, and then the line returns to the 300# spec line. Between the two block valves there is a branch, a block valve (normally closed) and then the branch flows into a sewer header (150#) that feeds into an atmospheric...