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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 ...
Ethan48's user avatar
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6 votes
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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
Chris Johns's user avatar
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6 votes

Water pump at top floor or bottom?

Think about the pressures. With the pump above the supply line, the pressure at the input of the pump will be lower than the supply. At roughly 2 PSI per foot, you're down about 18 PSI. Since air ...
Olin Lathrop's user avatar
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6 votes
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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, ...
fred_dot_u's user avatar
  • 7,055
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.
Tiger Guy's user avatar
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4 votes
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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, ...
ChemE mang's user avatar
3 votes
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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 ...
ShadowMan's user avatar
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3 votes
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How does a union joint with two male threads work?

Typically, most threads on pipes (in the USA at least) are male NPT and all the couplings or fittings are female NPT. You can connect two pipes with a coupling as long as the last pipe added is free ...
ericnutsch's user avatar
  • 8,136
3 votes

What are these bent shapes on this elbow in a compressor suction pipe?

I suspect that the crescent shaped sections penetrate all the way through the pipe and are turning vanes to help direct the flow around the sharp corner. In pipe of this size it is much easier to ...
Chris Johns's user avatar
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3 votes
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What are these bent shapes on this elbow in a compressor suction pipe?

Notice that the "shapes" are in a right angled bend where the flow changes directions. Sometimes vanes are placed in right angled bends to reduce shock losses by reducing the turbulence of the flow ...
Fred's user avatar
  • 9,667
3 votes
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Service Life of a Flashback Arrestor

The manufacturer says this about maintanence: annual testing of the non-return valve, body leak tightness and flow capacity is recommended WITT is happy to supply special test equipment ...
mart's user avatar
  • 4,781
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 ...
blacksmith37's user avatar
  • 6,134
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 ...
Pete W's user avatar
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3 votes
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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-...
Transistor's user avatar
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2 votes
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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 ...
AsymLabs's user avatar
  • 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 ...
ChP's user avatar
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2 votes

What is the difference between NPT and pipe diameter?

Pipe comes in different wall thicknesses, designated schedule 40, Sch. 80, Sch. 10, etc. Higher numbers are thicker walls. The outer diameter is the same for all schedules, so the inner diameter ...
Mark's user avatar
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2 votes
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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 ...
Ethan48's user avatar
  • 4,531
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 ...
ratchet freak's user avatar
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 ...
SF.'s user avatar
  • 6,135
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...
Solar Mike's user avatar
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2 votes
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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 ...
Brock Adams's user avatar
2 votes
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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 ...
alephzero's user avatar
  • 12.5k
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 ...
UseitorLoseit's user avatar
2 votes
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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:...
jko's user avatar
  • 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 ...
Transistor's user avatar
  • 10.6k
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 ...
Tiger Guy's user avatar
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2 votes
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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 ...
kamran's user avatar
  • 22.2k
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....
kamran's user avatar
  • 22.2k
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 ...
NMech's user avatar
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