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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...

Aha! So, the basic rule of thumb is: for an unattached pipe runing up a tank, you support from the bottom because it basically can grow up as much as it needs, but if there is a nozzle connection (i.e. an overflow) at the top, then you would support from the top, and guide down.

Thanks for the replys. In response to Stephens question, the way the pipe is set up, below the bottom support, the pipe turns at a 90 and travels 8' to the closest piece of steel which we can then support. This 8', I had calculated, was length enough to allow the pipe to grow down without...

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...

Nozzle Twister: First off, thank you for reminding me to remove the corrosion thickness in my calculations. I'd totally skipped that step. Now, bringing up again my original questions, the 'A'referened to in D.2 would be the excess thickness alone, correct? (Nominal pipe size - tolerance -...

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...

Montemayor, I understand your recommendations, however, you were right, our process won't allow us to separate the two vessels. We want to form a vacuum on tank A, but there is no way to do that. (We didn't want to add a fan or steam ejector, or any other vacuum forming device to the tank)...

Thank you Montemayor for your reply. You had very good insight. As far as the rating of the tanks, A is a new tank we are having constructed to a rating of 20", so I am pretty comfortable in that. B is an existing vessel which was indeed re-rated last year. It had been originally designed...

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...

dockthedog, Thanks for the quick reply. Actually, these are three large (40,000 gal. UL tanks, horizontal). So, the weak shell to roof seam is out. What I didn't really explain well regarding the equation I am using is that the 'V' stated, is found in a table based on wetted area of the tank...

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 did find suitable locations for flow meters. For example, our best one was a 12" line, with a straight run of pipe approximately 40' upstream, and then about 55' downstream was a 90 degree elbow. We tried using two different flow meters, each reporting errors that were indicative of...

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...