Questions tagged [piping]

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3answers
57 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 ...
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1answer
56 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 ...
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3answers
215 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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2answers
62 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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0answers
29 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 ...
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1answer
53 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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1answer
47 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 ...
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1answer
26 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) ...
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1answer
134 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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1answer
67 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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2answers
159 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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1answer
288 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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1answer
37 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 ...
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2answers
42 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 ...
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0answers
33 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
63 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
149 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
142 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
1k 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
164 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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3answers
199 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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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 ...
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2answers
848 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
257 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
114 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
61 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
68 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
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 ...
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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?
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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
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2answers
324 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
389 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
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, ...
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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 ...
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2answers
302 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
222 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
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
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1answer
108 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
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 ...
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4answers
15k 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
264 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
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 ...
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2answers
328 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
192 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
98 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
628 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
409 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
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
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2answers
361 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) ...