Questions tagged [piping]

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dielectric unions and bonding continuity

I am a layperson not an engineer. In the diagram below showing an old house with a mix of copper and galvanized steel water pipes connected by a dielectric union, with the two dissimilar sections of ...
Tim's user avatar
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2 answers
70 views

What is this hole in some gas related threads

What are those holes for? (Those are for CO2.) Here are a few examples :
Camion's user avatar
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How to know if air is trapped at the high point of a piping system

I have a piping system (in my case, a heat exchanger) with several high points, currently in operation. The HX was filled "pressure less" (one side open) and is now supplied by a heating ...
mart's user avatar
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1 answer
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Estimating circular pipe flow velocity through a known elevation profile and known length with a known initial pressure and flow velocity

I have a known elevation profile spanning the length of my pipe (~600 meters). An elevation value is given for every five meters of pipe. At the beginning of the pipe, I have a known velocity (1.1 m/s)...
Karl's user avatar
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1 answer
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Minimizing heat transfer to the contents of a non-airtight pipe

Consider the following simple (half)pipe setup: The grey part is a galvanized-steel half-pipe. The green part consists of the ABS plastic non-airtight top lid and an internal layer of ABS plastic ...
Noideas's user avatar
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1 answer
393 views

Calculating Pressure Loss (K Value) of Pipe Bends at varying Angles

I am analyzing the total pressure loss of a run of pipe that has several pipe bends at varying angles (30, 60, 45, 90, etc. degrees). Reading through CRANE: Flow of Fluids Through Valves, Fittings, ...
nwin's user avatar
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0 answers
16 views

How to estimate the amount of fuel leakage on a pressurized pipeline

I need to identify the amount of leakage into the machinery space, as during an incident, the engineer started internal fuel transfer from a cargo tank to the fuel daily service tank. The fuel pump ...
dans321's user avatar
0 votes
1 answer
262 views

What are shear lugs? (Piping supporting)

There is a course I'm following regarding Piping Design & Engineering. In a section about 'supporting' they talk about 'Shear lugs' but nowhere is there an explanation about what shear lugs ...
Younes Boubker's user avatar
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32 views

How to attach two suction hose pipes with different radii?

I have two suction hose pipes, one of smaller radii from my washing machine, and another of large, which goes to a drain. What would be the best way to connect these two pipes?
tryst with freedom's user avatar
1 vote
1 answer
97 views

How to transfer high pressure hydrogen using flexible pipes?

The task is to transfer hydrogen (high pressure gas > 400 bars) from offshore platform to land. To do so we have to use flexible pipes but for high pressure and high flow rate I'm afraid we can't ...
Aron PE's user avatar
0 votes
1 answer
64 views

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 ...
Navinmm's user avatar
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39 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 ...
ehbowen's user avatar
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3 answers
86 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 ...
pj0909's user avatar
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0 votes
3 answers
69 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 ...
Yanick Salzmann's user avatar
0 votes
1 answer
2k 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 ...
Orlando Alexander's user avatar
3 votes
3 answers
6k 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, ...
Pascal's user avatar
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2 votes
2 answers
74 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 ...
Methos's user avatar
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0 answers
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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 ...
thebmags's user avatar
1 vote
1 answer
223 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?
Sahil Syazwan's user avatar
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1 answer
123 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 ...
Sangoku's user avatar
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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) ...
JustBeingHelpful's user avatar
1 vote
1 answer
3k 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 ...
Jaivishnu's user avatar
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1 vote
1 answer
442 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 ...
Jaivishnu's user avatar
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1 vote
2 answers
702 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 ...
Kyle B's user avatar
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1 vote
3 answers
2k 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 ...
ericnutsch's user avatar
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2 votes
1 answer
132 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 ...
thatoneguyyouknow's user avatar
0 votes
2 answers
81 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 ...
thebmags's user avatar
1 vote
0 answers
45 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).
ZenMaster's user avatar
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1 answer
98 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 ...
Cerezo's user avatar
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0 votes
1 answer
379 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. ...
Andrew Bannerman's user avatar
2 votes
1 answer
317 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 ...
Cameron Wight's user avatar
2 votes
4 answers
3k 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....
thebmags's user avatar
-1 votes
1 answer
234 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 ...
dsc81's user avatar
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1 vote
3 answers
443 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 ...
goose's user avatar
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1 vote
0 answers
28 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 ...
Drunk Cynic's user avatar
0 votes
2 answers
5k 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. ...
mamuts's user avatar
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3 votes
1 answer
325 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 ?
Dave Ward's user avatar
1 vote
3 answers
147 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 ...
mart's user avatar
  • 4,771
1 vote
2 answers
73 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 "...
StayOnTarget's user avatar
1 vote
1 answer
109 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 ...
S User's user avatar
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3 votes
1 answer
65 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 ...
CoryG's user avatar
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2 votes
0 answers
29 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?
mateos's user avatar
  • 121
6 votes
2 answers
205 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 ...
Jonathan Rayner's user avatar
3 votes
2 answers
716 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 ...
Thomas Wilk's user avatar
0 votes
1 answer
466 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 ...
Cameron Gruich's user avatar
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, ...
Artyom Ionash's user avatar
0 votes
1 answer
55 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 ...
Alan's user avatar
  • 101
5 votes
2 answers
342 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 ...
Mech_Engineer's user avatar
4 votes
1 answer
256 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 ...
Astor Florida's user avatar
1 vote
1 answer
5k 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 ...
Algo's user avatar
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