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# Tag Info

## Hot answers tagged piping

9 votes

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

As of the 2013 edition of ASME B16.5, the scope section explains: This Standard states values in both SI (Metric) and U.S. Customary units. As an exception, diameter of bolts and flange bolt ...
• 4,551
6 votes
Accepted

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

I would guess that the discrepancy is down to rounding fractional inch sizes to decimal inches ie 2.38 is not exactly 2 3/8" Note that 2.375 (two and three quarter eighth inches) is 60.325mm
• 15.2k
6 votes
Accepted

### Watering utility that does not spill

The water level in the lower basin will not exceed the level of the bottom of the bottle opening. When the empty device is loaded with a full bottle (by keeping the bottle upright!) and then inverted, ...
• 7,287
5 votes

### Why actuators are mounted in inverted position?

The cylinder will be mounted where it is easiest to get the hydraulic lines to it.
• 7,074
4 votes
Accepted

### Why is hydrotest pressure more than MAWP as per ASME Sec VIII Div 1

A Mechanical engineer, or some one who works in materials/reliability would be better suited to answer this, but I believe the reasoning to be the a combination of safety factor (ensuring fittings, ...
• 605
3 votes

### Tube Strength vs Pipe Strength

The advertisement referenced in the question was written by a liberal arts major without much of a clue what he was writing about. Pipe comes in certain diameters and wall thicknesses and threads ...
• 6,162
3 votes
Accepted

### Tube Strength vs Pipe Strength

Firstly, I assume that when you say "tube" what you mean is Hollow Structural Sections, and when you say "pipe" I assume that you mean typical scheduled pipe sections. In the US, the AISC Code ...
• 480
3 votes

### Given flow rate of an orifice at one pressure, how do I calculate flow rate for a different pressure?

Here is a reference from RoyMech, see section under "Orifice Flow Meter". The setup has the orifice placed in a pipe. Below is a similar, perhaps simpler, expression, from Jobson 1955, part ...
• 1,571
3 votes
Accepted

### Given flow rate of an orifice at one pressure, how do I calculate flow rate for a different pressure?

Flow rate is directly proportional to the square root of pressure. So for any given orifice, all else being equal, $\frac{GPM}{\sqrt{PSI}}$ is constant. Technically PSI here is the pressure ...
• 171
3 votes
Accepted

### What is this hole in some gas related threads

Those are pressure relief ports. The threads you have pictured are parallel type and are used without PTFE tape on CO2 drink carbonators such as Sodastream brand. The gas-tight seal is made by the O-...
• 10.9k
2 votes

### Water pump at top floor or bottom?

Considering this is a centrifugal water pump, it can provide very little air suction. That means if your pump is airlocked, there's not a shade of a chance it will be able to produce nearly enough ...
• 6,115
2 votes
Accepted

### What tool does one use to inspect pipe bevel angles?

Based on your translation of 'root face' I'm assuming that the bevel they are inspecting is a bevel that has been prepared for a groove weld between two pipes. If that's the case, the typical ...
• 4,551
2 votes
Accepted

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

It is difficult to provide a useful answer to this question without additional information. For example, what is the system pressurization - operating psi/bars? Having installed ductile iron water ...
• 652
2 votes

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

The problem with older and under-maintained (this is South Africa after all) systems is that the pipes get brittle, rusted and joints fragile and the network won't be able to handle the transient ...
• 623
2 votes

### Type and mechanism of piping fitting

The flange on the pipes are beveled and the groove in the clamp is V shaped. There is also a seal between the 2 pipes. As the clamp is screwed down it will force the 2 ends together. The dimensions ...
• 6,106
2 votes

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

Simply if you remove the ventilation then you create a closed tube where the « piston » ie waste is trying to create a vacuum behind it, that is, untill it can draw past the liquid in the u-bend...
• 15.9k
2 votes

### Can an enclosure be water tight and NOT air tight?

In general water tight does not mean air tight, while air tight does mean water tight assuming the material is not water soluble. Air contains some smaller molecules than water. Either can diffuse ...
2 votes
Accepted

### Pressure design thickness and how relates to hoop stress

The "area" terms in the equations all cancel out. Think about a section of pipe of internal diameter $d$, length $l$, thickness $t$ with internal pressure $P$. Now imagine you slice the section of ...
• 12.6k
2 votes
Accepted

### P&ID Symbol Identification Question

Two of those are not standard usage symbols in that way. You may to have to use context and/or a physical inspection to determine what they are. Where is that diagram from? Various organizations ...
• 223
2 votes
Accepted

### Leaky NPT fixes

With good quality threads, 3 wraps of PTFE tape can seal NPT connections above 1,000 psi. SAE J1926 straight thread o-ring ports will seal a lot easier though. I've also used this company in the past:...
• 2,347
2 votes

### Heat Loss through a run of insulated piping

Have a look at heatsink calculations used in power electronics. The thermal loss calculation is quite analogous to an electrical circuit. This will all be much simpler in SI units rather than your ...
• 10.9k
2 votes

### How do you maintain a constant pressure in a pipe with multiple outlets?

This is a hard problem. Flow through an orifice is already hard to predict, and now you're changing the pressure of the exist due to depth of water. Without going through a bunch of calcs, I suspect ...
• 7,074
2 votes
Accepted

### Is stud bolts covered under ASME B18.2.1

Stud bolt dimensions are covered under several standards. The stud bolt lengths are defined in the ASME B16.5 standard. Bolts' threadings are defined in ASME B1.1 Unified Inch Screw Threads, (UN and ...
• 22.6k
2 votes

### How can I ensure steady flow to all the valves?

One basic way is to adjust the valves, the dry ones fully open and the ones bleeding all the pressure just slightly open, or even restricted permanently by a smaller size bushing just before the valve....
• 22.6k
2 votes

### How can I ensure steady flow to all the valves?

The most precise way to control flow is with valves/flow regulator. The main problem is the cost. Although, its a very basic component and its not too costly if you have too many outlets the cost ...
• 24.4k
2 votes

### Given flow rate of an orifice at one pressure, how do I calculate flow rate for a different pressure?

If you know the external diameter and orifice diameter, From Wikipedia the orifice plate equation : $$q_m =\frac{ C_d}{\sqrt{1-\beta^4}}\epsilon\frac{\pi}{4} d^2 \sqrt{2\Delta p \cdot \rho_1}$$ ...
• 24.4k
2 votes

### Watering utility that does not spill

Works on the Toricelli vacuum - check out the barometer
• 15.9k
2 votes

### "Vented loop" in fuel reservoir overflow line

It put the max liquid line higher. With the elbow the liquid has to reach to the elbow instead of just the hole in the wall. The hole itself cannot be put at that height because that's where the roof ...
• 6,106
1 vote

### Leaky NPT fixes

NPT are not intended to hold very high pressure , but I do not remember a number. The oil/gas industry uses proprietary threads for wells with pressure above roughly 500 psi ( depending on the company)...
• 6,162

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