Hello. I was wonderin gif anyone could tell me where in ASME B31.1 does it reference the required spacing between two or more branch connections on a pipe header. I am talking mainly about weldolets. How close can two weldolets of the same size be on the same header? Can they overlap...
Hi. I've been asked to provide some information to a tank vendor for them to engineer and install pipe supports that will run up the side of their tank.
This particular system/tank is an exact copy of an existing tank system at another one of the clients sites. The tank size, pipe sizes, and...
Hello all,
I am trying to get involved with pipe support design. (We're going to re-vamp our standard support details a little bit in the next year or so) I know a lot about a little with regards to support design, mainly due to being familiar with our existing standards, but I do realize I...
I'm working on determining the size of reinforcing pad required for a branch connection to an existing pipe. (10" into a 16" header.) With the temperature and pressure ratings, I have determined that each pipe wall, individually, is acceptably thick enough for operation. According to...
Hello all,
I've recently begun to become introduced to the wolrd of pipe stress analysis by computer program, mainly using Caesar II. I know that in order to properly understand the useage and limitations of the programs, I must have a strong grasp of these types of analysis by hand. Can...
Hello all,
I've been assigned to begin performing HVAC calculations for various buildings/rooms for my company. As an intro to the work, I was given a stack of old calcs previous engineers have done. I understand everything, except when it comes to head loads through the perimeter of a...
We have a large (400' x 750') warehouse, for which has now been decided, will require a heating system. I've been asked to estimate the cost. I've completed the walls and roof heat loss portion of my excercise, and it is a rather tight building, so infiltration is pretty low, but where I'm...
Hello,
I have a mechanical background, and I was wondering if someone can give me a brief definition/description of the main types of electrical/controls drawings: one-lines, elementaries, and loop diagrams. Also, is there a website that gives information as to how to read these types of...
kryanl (Mechanical) Apr 22, 2005
Hello. My problem is with two rather large vessels, A and B. Vessel B (rated for nearly a full vacuum) is kept at a normal vacuum of about 12” w.c. We are installing vessel A (rated for 20” w.c.) about 100’ away from B, and will connect the two together with a...
Hello. My problem is with two rather large vessels, A and B. Vessel B (rated for nearly a full vacuum) is kept at a normal vacuum of about 12” w.c. We are installing vessel A (rated for 20” w.c.) about 100’ away from B, and will connect the two together with a duct. Now, vessel B is known to...
In the coming months, we are going to get an existing tank re-rated. The tank currently operates at pretty much atmospheric pressure. I was assigned the duty of digging out the original files for the tank, and I notices something that I can't seem to reason to my self. The tank was designed...
I've been trying to go through the sizing of vents for a couple fuel oil storage tanks, and have come to a standstill when trying to find both the latent heat of vaporization and the molecular weight of fuel oil. I am looking into No.2 oil through No.6. (We're renovating a small tank farm.)...
We've been called in to troubleshoot a pumping system at one of our mills, which has been working fine up until now, but the operators are looking for a more efficient system. Right now, 120 F water is being pumped to a total of 4 separate users. These users range in both flow and pressure...
Hello,
We have a situation where a pump is cavitating. I think that some of teh probelem lies in the suction piping, since calculations show we have enough NPSH (although, admittedly, we could have more). We are pumping out of the bottom of a tank, where the water (200F) level is 15' above...
Hello Everyone, I have a piping problem that is two-fold:
Situation: A pipe, roughly 100’ long, in 30-degree F (ambient winter) weather. The inlet water flow and temperature (approx. 100F) are known. I am trying to figure out the water outlet temperature for two cases:
1. The water is...
Hello Everyone, I have a piping problem that is two-fold:
Situation: A pipe, roughly 100’ long, in 30-degree F (ambient winter) weather. The inlet water flow and temperature (approx. 100F) are known. I am trying to figure out the water outlet temperature for two cases:
1. The water is...
We were given an analysis of flue gas exiting a recovery boiler. The dust makeup was reported in percent volume values. However, no total volume or any other information was given. How can I figure out the specifc gravity of the material? I tried using the densities of each individual...
Hello. I am a mechanical engineer, and right now, we are beginning to work on the foundations of a large structure. The structural engineers often refer to different terms, all of which I used to think were different ways of saying "foundation". Can you please explain to me (or...
Hello,
As part of wastewater treatment, we need to increase the DO in water. Someone brought up the idea of using a deep pit (approx. 100'). I have only seen tables relating dissolved oxygen (in mg/L) relating temperature and DO. I am sure that it is pretty obvious that the deeper the pit...
Hi all,
I am having trouble trying to distinguish the difference between NPSH and pressure. I know that NPSHr is what you must have in order for the pump to not cavitate.
It is equal to: (static height) + (pressure within vessel) - (vapor pressure) - (pipe friction losses).
For example...
