Questions tagged [piping]

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Temperature measurement in a process pipe

I am going through a PID in which the line size was increased from 2 inch to 4 inch for temperature measurement and then decreased to 2 inch using two reduces. What is the need for reducers before ...
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0 answers
23 views

Diesel fuel valve outdoors: Gate, Globe, or Ball?

Real world question: We need to replace an internally failed (cannot shut) gate valve installed as a shut-off valve on a 2" Diesel fuel line exposed to weather (roof top) and operating at less ...
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Piping isometric drawing design standards

I am a newbie in engineering drawings and interested in piping iso drawings design standards. Specifically, I need to know the next: Is there any standard for fonts one may use in the drawing? Is ...
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13 views

Pipe Flow Expert Software x dwg Isometrics compatibility

In my office we use the pipe flow expert software for project and model pipe systems. But usually we redesign all of the isometrics made on dwg cad. Has any one any idea how to reuse the dwg drawing ...
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1 vote
3 answers
77 views

Why actuators are mounted in inverted position?

Hope you are doing good. Can anyone please explain to me why actuators are mounted in inverted position on some excavators? Please see the image for better understanding of my question. Another ...
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3 answers
62 views

Watering utility that does not spill

I saw a video showing a water bowl for a cat that used an upside down PET bottle to provide "fresh" water when cats consume some of the water in the bowl. I wanted to design something ...
0 votes
1 answer
496 views

How to calculate head loss in vertical pipe?

I have used the Hazen-Williams equation to calculate head loss for falling water in a vertical pipe I am using in a hydroelectricity project of mine. Hazen-Williams equation: These are the properties ...
3 votes
3 answers
839 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, ...
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2 votes
2 answers
69 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 ...
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1 vote
0 answers
62 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
1 answer
102 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?
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1 answer
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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 ...
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1 answer
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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) ...
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1 vote
1 answer
523 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 ...
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1 vote
1 answer
195 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 ...
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1 vote
2 answers
313 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 ...
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1 vote
2 answers
865 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 ...
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2 votes
1 answer
64 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
2 answers
50 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 vote
0 answers
37 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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1 answer
79 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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1 answer
227 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
1 answer
220 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
3 answers
2k 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....
-1 votes
1 answer
187 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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1 vote
3 answers
314 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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1 vote
0 answers
25 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
2 answers
2k 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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3 votes
1 answer
288 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
3 answers
142 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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1 vote
2 answers
67 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
1 answer
80 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 ...
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3 votes
1 answer
64 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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2 votes
0 answers
26 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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6 votes
2 answers
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
2 answers
472 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
1 answer
409 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
0 answers
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
1 answer
45 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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5 votes
2 answers
313 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
1 answer
240 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
1 answer
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 ...
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2 votes
1 answer
121 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
2 answers
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
4 answers
17k 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
0 answers
274 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 ...
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4 votes
1 answer
14k 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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4 votes
2 answers
354 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
1 answer
216 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 vote
0 answers
63 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 ...
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