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Questions tagged [piping]

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9 views

Minor losses in a header

I need to calculate the minor losses in a steam header. I have calculated the major friction losses. But I can't figure out how to find the minor losses since the header has multiple tappings and not ...
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22 views

What is the smallest size of pipe to which I can Weld a 1 inch pipe Perpendicular to the Axis?

I would to know what is (or how to calculate) the size (dia) if the smallest pipe to which I can weld a 1 inch pipe from the side of the bigger pipe perpendicular to its axis (like a tee).
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1answer
56 views

Can an enclosure be water tight and NOT air tight?

I am trying to create an air tight cable exit system for a fuel tank. Basically, an instrument is to placed in the tank, with its cable exiting through the top of the tank. This exit point needs to ...
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1answer
38 views

Pressure design thickness and how relates to hoop stress

Stress = Force / Area Lets see with static force... what happens to stress output when decrease the area. ...
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1answer
55 views

P&ID Symbol Identification Question

Does anyone know what these three symbols are? I am working to identify them but they do not seem to appear in the site: https://www.edrawsoft.com/pid-legend.php Does anyone know a better reference ...
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3answers
120 views

Tube Strength vs Pipe Strength

I've been going down the rabbit hole as far for pipe vs tube and have ran into the same statement from co-workers and on the internet. That statement is "TUBE IS STRONGER THAN PIPE" https://www....
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1answer
50 views

What Is the Different Between Single Nipple, Double Nipple, and Pipe Nipple

I just work on the engineering company that specialize in water piping. I am confuse about the term of nipple. What is the different between Single Nipple, Double Nipple, and Pipe Nipple? Hope ...
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2answers
73 views

How can I calculate the amount of heat my copper water trap can dissipate?

My small (1.5hp) air compressor is connected to a water trap made of 8mm copper of about 4 metres length. The idea is that you push the compressed air through the piping which cools it, condensing the ...
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14 views

How to get resistance K factor of order 10^4 with complete freedom to vary the geometry?

I want to design a tube (radius=2mm) with a K-factor (https://neutrium.net/fluid_flow/pressure-loss-from-fittings-excess-head-k-method/) of order 10^4. Could this be done by putting multiple orifice ...
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0answers
14 views

Pressure reduction and maintain back-flow from air compressor

I have an air compressor ($P_{max}=4\text{ bar}$) and for my application as an open cycle, I would like to use the $P_{max}=2\text{ bar}$ along with maintaining backflow of the air. Can anyone suggest ...
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0answers
15 views

Is this Proportional Electro-pneumatic valve a direct replacement for other valves listed?

In the midst of trying to redesign the pneumatic subsystem of a combined system, I'm at the point of validating a new valve would serve as a direct replacement. The reason for the redesign is an ...
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2answers
90 views

pressure loss in a T fitting

For weeks I have been searching internet , but still unable to find answer , so here it goes: I have to calculate pressure losses in heating circuit , and am stuck at calculating losses in T fittings. ...
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1answer
123 views

Flow metrics of water at 12 bar through a 6" diameter open ended pipe 100 ft long

I have a water jet pump pushing water through a 6" diameter open ended pipe 100 ft long, I need to get 12 bar gauge pressure on the pump discharge, what size (m3/hour) pump do I need ?
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3answers
46 views

Why does removal of ventilation of a sewage pipe lead to backflow from the toilet?

A building where three toilets (toilet + urinal each) are connected to the same sewage pipe under the building. The pipe is DN 100 and should have (according to old plans) a gradient of 1:50. Two ...
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2answers
50 views

Type and mechanism of piping fitting

What is the type of and principle of operation of the fitting connector circled in this photo: There are a few other similar joints depicted. It looks like this connector is tightened "...
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1answer
42 views

Application of Bernoulli's equation between stationary and moving reference points

I'm working on a pipe design problem using Bernoulli's equation, from first principles. The pipe is from a water storage reservoir (point 1) and discharges into a river (point 2). These are my two ...
3
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1answer
59 views

What's the longest lasting tubing in air?

What's the longest lasting tubing for use in low pressure air systems? I'm looking at building a greenhouse with double or triple layer ETFE panels and the tubing would be run through the metal pipe ...
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0answers
24 views

Alternative to HDPE Piping for long range sea-water + water transport [closed]

Is there an alternative for the expensive HDPE Piping for long range sea water transport?
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3answers
165 views

Is there a way to reduce leaks and infrastructure damage when turning water on and off at the scale of city?

Cape Town, South Africa is experiencing an extremely serious drought, with estimates putting April 21, 2018 as the day that the city will be forced to shut off all municipal water supplies and begin ...
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2answers
105 views

What is the difference between NPT and pipe diameter?

I am confused about the difference between NPT, outer diameter of a pipe, and nominal pipe size. Let's say I have a 1/8" NPT pipe. Does this mean the outer diameter of my pipe is 1/8"? Is the ...
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1answer
289 views

How to do a pressure drop or saltation velocity calculation on pneumatically conveyed solids in slug flow?

If I am pneumatically conveying solids in slug flow, is there a method that works in a general case to determine the pressure drop or saltation velocity? By a general case method, I mean one that is ...
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0answers
2k views

Calculating discharge on the pipe diameter and the pressure?

Is it possible to сalculate discharge / flow rate on the pipe diameter and the pressure (for constant pressure)? For example: Pressure_internal = 5 bar, ...
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1answer
40 views

Force and Headloss Calculations for Three Stage Condenser

I am looking for some guidance on calculations for a natural condenser project. I am a Computer Engineering student, so this stuff is out of my range. The fundamental question I am trying to answer ...
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2answers
258 views

What is the correct pipe size for a 2inch pipe?

I'm was looking into the ASME B16.5Pipe flanges and pipe fittings and it has 2 dimension tables metric and inches. What I found was rather strange for me. I was ...
4
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1answer
186 views

How to deal with thermal expansion in a city wide heating system?

How to deal with thermal expansion in a city wide heating system? Background: As part of the program to combat pollution in and around Beijing, my adopted city of Zhuozhou (population, over half ...
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1answer
2k views

What would happen to a misinstalled globe valve?

Since globe valves are unidirectional and should be installed in one direction only I encountered a valves supplier that does not mark the globe valve body with flow direction, the valve eventually ...
2
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1answer
89 views

Matching up cam lock or cam and groove coupling

I am trying to select new hose cam locks to connect to cam locks on an existing pipe system. There seem to be a lot of different types of cam locks as I've searched for them, so I am unsure how I ...
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2answers
1k views

What tool does one use to inspect pipe bevel angles?

My translation of a document published by the Pervouralsk New Pipe Plant: Inspection of pipe-end root face (“face ring”) Inspection of this type is carried out as required by the ...
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4answers
8k views

Water pump at top floor or bottom?

Which position of the water pump in the below diagram provide maximum water output to the overhead tank? Each floor is 12 feet in height. I already have the pump (Centrifugal Regenerative Self ...
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0answers
196 views

What is the pressure-temperature rating for a stainless steel Class 150 nipple?

Which ASME standard defines Class 150 Nipples - material stainless steel? What is the pressure-temperature rating for such a fitting? I don't have ASME standards available but I don't believe ASME ...
4
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1answer
10k views

How does a union joint with two male threads work?

How does union joint with two male threaded ends work? Does one male end rotate 360 degrees around it axis? How is the inside of the union constructed? Can I connect two pipes with female threads ...
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2answers
256 views

What are these bent shapes on this elbow in a compressor suction pipe?

See here are the shapes which are made on the suction head of compressor, What are these, and why are they on the suction head pipe?
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1answer
167 views

Service Life of a Flashback Arrestor

First of all, I would like to know about the service life of a flashback arrestor. In my laboratory, I got three flashback arrestors {WITTgas RF53N(1/4”NPT-F), Brass} from the ex-students who used ...
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0answers
61 views

Piping construction, flanged connection - Difference between Collar and Flat collar

Consider a collar (V-Bördel) and a flat collar (glatter Bund) for a flanged connection, in conjunction with a loose flange. What are reasons to use one over the other? I want to know because a ...
3
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1answer
93 views

How often do you need to check torques on bolted flanges?

Due to the fact that pipe flanges rely on bolts, and bolts rely on friction, it seems obvious to me, as a manufacturer of piping, to recommend that bolt torques need to be checked every so often, to ...
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3answers
561 views

Measuring pipe bolt torque without a torque wrench

I've had trouble with leaky pipe flanges, since my flanges are made of plastic. The problem comes down to the fact that sealing a flange is based on torque. Torque relies on bolt friction, which can ...
3
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1answer
319 views

What boundary condition should I use for the edge of a blind flange?

When testing a pressurized pipe with off-standard flanges, often times the materials available to fabricate a blind flange of the correct size are limited to what is around. I've made it a habit of ...
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2answers
3k views

Why prefer any other pipes over plastic pipes for drainage and culverts?

Plastic pipes look superior - no corrosion, lightweight, easy to install, a bit flexible. Yet there're lots of cases when culverts and drainage pipes are made of steel (corrosive) and reinforced ...
6
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2answers
340 views

Pipe seized to inaccessible coupling - how to attach a new pipe?

A friend of mine that doesn't use the internet much runs a commercial laundry. They use an old 'Manlove Tullis' laundry calendar (c. 1980) that looks like this: (click to enlarge photos) ...
6
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1answer
3k views

Why prefer plain pipes over corrugated pipes for storm sewage and culverts?

Recently I observed installing new storm sewage along a city street. Pipes have plain surface (not corrugated) and are made of some plastic looking like HDPE (polyethylene) and their diameter is ...
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1answer
448 views

Pump suction and discharge sizes

I am looking to buy a centrifugal monoblock pump for my laboratory. The suction and discharge sizes are mentioned as 12mm x 12mm. Does anybody know what does it mean? Does it mean 12mm OD, or does it ...
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3answers
8k views

Force required to empty a syringe

How would you go about solving the following problem. I believe Bernoulli's equation needs to be employed, but I'm not sure how. Find the magnitude of the force that needs to be applied to a piston ...
4
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1answer
2k views

How to bend iron pipe into a spiral guide rail for stair lifters

I need to bend one circular iron pipe with 4 cm diameter and 2 mm thickness as a guide rail for an electric stair lifter similar to this picture (the spiral bending part of stair): How could I bend ...
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3answers
3k views

How to seal a pressure vessel

I'm trying to construct a stainless steel high pressure containment vessel (pressure reactor) (2000 psi or so). Yes I realize that this is a don't try this at home type of thing, and I plan to put ...
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3answers
18k views

How fast does solid waste fall in vertical drain pipes?

Some building are really tall, if you flush the toilet and the contents go into a pipe and straight down, there could be a lot of energy, potentially enough to cause harm to the sewer pipe at the end ...
2
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1answer
95 views

What is the name of the part that allows a steam wand to have a moveable joint?

On espresso machines, there is some kind of pipe joint which allows the steam wand to move while maintaining its seal. What is this component called?
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1answer
155 views

How can I fit a DN16 flange to a DN10 flanged pipe?

One of the valves on my 3 bar line just failed. Without it, our production has ground to a stop and we can't operate until we get a replacement (which we have already ordered). In order to make a ...