Questions tagged [piping]
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56
questions
3
votes
3answers
178 views
Given flow rate of an orifice at one pressure, how do I calculate flow rate for a different pressure?
Given an orifice rated 1.8 GPM of water at 90 PSI, how do I calculate the flow rate at 30 PSI and what rating I would need to purchase to achieve 1.8 GPM at 30 PSI?
Below added to give some context, ...
2
votes
2answers
60 views
How can I ensure steady flow to all the valves?
I've set this up for my hydroponics water distribution system. The water is pumped up, and is distributed via the valves. I can manual control the valves so that each outlet has a steady flow of ...
1
vote
0answers
19 views
ASME B31.3, Temporary connections?
I've got a quick question related to ASME B31.3.
In my system I plan on making connections in the field for deploying the system(ie think air products LN2 tanker showing up on site and deploying flex ...
1
vote
1answer
48 views
Does P&ID have cross-reference same as electrical drawing?
In electrical i usually use cross-references to identify their symbols locations, I am still yet a lot to discover P&ID. So my question is, does P&ID have this such of thing?
0
votes
1answer
43 views
Is the flow same in parallel pipes feeding into a water container?
I have 2 questions.
I am aware that the headloss is the same in all intakes into a water container.
My question is, is this illustration correct that the flow is different for different outlets?
And ...
0
votes
1answer
25 views
Fasten adjustable perpendicular cylinders rotating on axis
What part(s) make it simple to secure two perpendicular cylinders together when one of the cylinders is rotating on its axis? In the drawing below, C(3) rotates with a simple motor. C(1) and C(2) ...
1
vote
1answer
88 views
Why is hydrotest pressure more than MAWP as per ASME Sec VIII Div 1
My understanding of MAWP in ASME BPVC Sec VIII Div 1 code is that it is the maximum pressure a pressure vessel should be subjected to. If that is the case, then why should the hydrotest pressure be ...
1
vote
1answer
49 views
Is stud bolts covered under ASME B18.2.1
I want to know if stud bolt dimensions are covered under ASME B18.2.1. I could not specifically find them in the standard or they may be included under some other technical name within the same ...
1
vote
2answers
136 views
How do you maintain a constant pressure in a pipe with multiple outlets?
I've seen in piping and ventilation systems, when they branch off, the continuation of the main trunk gets smaller. Presumably this keeps the pressure (sorta) constant along the whole length of the ...
1
vote
1answer
187 views
How do british standard pipe parallel (BSPP) (G) threads seal?
I realize that there must be some sort of o-ring, gasket, or washer, but from an engineering standpoint it is not clear how to know what fitting will seal to what without having the parts in front of ...
2
votes
1answer
28 views
Heat Loss through a run of insulated piping
I've been racking my head around calculating the amount of heat loss still water will experience through a run of insulated piping. The water in the tank is maintained at roughly 550°F saturated, and ...
0
votes
2answers
39 views
Leaky NPT fixes
At my current role we have a hell of a time trying to get NPT threads to seal. We avoid them where we can but sometimes its just faster and cheaper to spec and buy parts with NPT threads.
We are ...
1
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0answers
29 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).
0
votes
1answer
61 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 ...
0
votes
1answer
118 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.
...
2
votes
1answer
125 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 ...
2
votes
3answers
905 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....
0
votes
1answer
151 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 ...
1
vote
3answers
177 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 ...
1
vote
0answers
18 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 ...
1
vote
2answers
694 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. ...
3
votes
1answer
247 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 ?
1
vote
3answers
103 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 ...
1
vote
2answers
59 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 "...
1
vote
1answer
65 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
votes
1answer
60 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 ...
2
votes
0answers
25 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?
6
votes
2answers
200 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 ...
3
votes
2answers
283 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 ...
0
votes
1answer
383 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 ...
1
vote
0answers
3k 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, ...
0
votes
1answer
42 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 ...
5
votes
2answers
300 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
votes
1answer
220 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 ...
1
vote
1answer
4k 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
votes
1answer
106 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 ...
3
votes
2answers
2k 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 regulatory ...
3
votes
4answers
14k 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 ...
1
vote
0answers
261 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
votes
1answer
13k 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 ...
4
votes
2answers
325 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?
3
votes
1answer
188 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 ...
1
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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
votes
1answer
97 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 ...
3
votes
3answers
619 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
votes
1answer
397 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 ...
6
votes
2answers
4k 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
votes
2answers
358 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
votes
1answer
4k 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 ...
1
vote
1answer
587 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 ...
