How can I reposition a soldered copper 90-degree fitting

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see other post on this excellent physics forum

https://www.physicsforums.com/threads/pressure-drop-in-elbows-bends-in-a-pipe.179830/

From my dynometer testing days, on race engines, any elbows, bends and restrictions affect the oil pump pressure.

copied from another post on internet..
Loss of pressure can be calculated using the formula hL =K v2/2g, where hL is the velocity head, v is velocity of flow, and g is the acceleration of gravity.

f is the friction factor (which may be found in tables or determined experimentally):

Turns result in f as follows:
90 degree turn ("L") = 60f
90 degree Sweep = 30f
45 degree sweep = 10f
T straight through = 20f
T through branch = 60f

The absolute most restrictive type of turn is the 90 degree turn ("L") & the T through branch (60f).

Using two 45 degree fittings is a better choice over 90 degree...

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Solder copper - You do this when you melt solid solder and allow it to flow into the tiny gap between the tubing and the fitting. The red arrows point to the silver-colored solder. Copyright 2018 Tim Carter

How To Solder Copper Tubing - It's Really Easy

Revised February 2018

I’ve been a master plumber for nearly thirty years, but you don’t even have to have one day of apprentice school under your belt to be able to solder a simple joint in standard copper tubing.

Successful soldering is just a matter of understanding basic chemistry and having a few very affordable tools. It also helps to practice on a few pieces of tubing before you try to advance to a real pipe that will carry water. If you do decide to work on your water lines, be sure you’re allowed to do it. Some cities and states forbid homeowners from working on their own plumbing.

Free & Fast Bids

CLICK HERE to get FREE & FAST BIDS from local plumbers if you're too timid to...

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Copper solder fittings are a resilient and reliable solution for your copper pipe fitting system in all types of installations. World Wide Metric’s copper solder fittings are compliant with the standards EN1254/1 and EN1254-4 and can be utilized in a wide variety of applications in both the construction and industrial engineering industries. Our copper solder fittings range is ISO 9001 certified and backed by numerous certificates of quality that verify their use in all domestic water, heating installations and gas installations.

The most common areas of use for copper solder fittings are in heating systems, hot and cold domestic water systems, cooling systems, gas installations, chilled water systems, compressed air systems (up to 30 bar/30°C) and solar plants. World Wide Metric provides copper solder fittings that are manufactured from high quality materials and those that are suitable for all types of copper piping including hard, half hard or soft.

World...

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Burning your house to the ground…

Is this the first thing that comes to mind when you think of soldering copper pipe?

Maybe I’m the only one thinking this, lol.

The first time I had to solder a pipe was in a joist bay in our kitchen.

Our pipe sprung a pinhole leak and was slowly turning the ceiling into mush.

Soldering is surprisingly straight forward once you learn all the basics.

After reading or watching today’s tutorial I bet you’ll be able to solder copper in 1 hour or less.

These tools and supplies make soldering so much EASIER

Learning how to solder copper pipe starts with cutting and prepping.

So let’s get started ;D

Cutting and Prepping Copper Pipe (it’s more fun than Legos)

There are many different tools used to cut copper pipe.

My two favorite tools are the AutoCut tube cutter and Ridgid No. 15.

AutoCut tools clamp onto the pipe and you simply turn them according to the...

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The comment that the "flow is reduced in the fittings" as related to PEX is incorrect. The flow through the line is the same unless there is a branch. The comment can only mean that the OP believes that a PEX fitting produces greater reduction in head than a copper fitting of the same type, i.e. a 90 degree PEX is less efficient than a 90 degree copper.

First of all, the losses in either type of fitting are essentially identical, since the smoothness factor for the two types of pipe are nearly identical, and the geometry of the fittings is effectively identical. Further, most PEX installations use fewer fittings than copper, since you can bend PEX, and you cannot bend hard copper. Finally, the total losses in a typical plumbing system are relatively small compared to the total head in the system, so the discussion is essentially irrelevant as far as normal residential use is concerned.

As far as the cost of tools, absolutely it costs more to buy a PEX ring...

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The copper must be long enough to cover the table, run down the sides, and then fold underneath the top. Measure the length of the table, add the thickness x 2, and add another 2 inches to wrap the copper underneath the table top (one inch on each end). For me the total length of my copper top was:

46" + .66 x 2 + 1 x 2 = ~50".

Which meant I had to cut off ~46". The cut was too long to use the brake so I had to cut it using the snips, which left a jagged edge. To straighten it out, put the jagged edge into the brake and cut it using the razor blade(s). Score the copper along the edge of the brake with the razor then use the brake to bend and snap off the copper. This will result in a nice clean edge. Using the brake is a two-person job so my photographer couldn't take a picture of the brake in action.

If necessary, do the same thing to the long edge so that you have a sheet of copper that overlaps your table by a few inches on all...

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IMPORTANT: Read this before you start

Introduction
Soldering copper pipes is a basic plumbing skill that once mastered will enable you to tackle many home repair and home improvement projects - for instance, replacing copper water lines or installing a new spigot. It can be as much an art as it is a science, thus the more you get the "feel for it", the faster and easier it gets.

Soldering copper pipe, or "sweating" as they call it in the trades, relies on capillary action to create a well-sealed joint. By using a propane torch to heat up the two pieces you are joining, solder is "sucked" into the joint and spreads evenly between the pipe and fitting. Once it cools, you should have a solid, leak-free joint that will last for years.

Use care when working with a torch. Keep the flame away from wood framing or other flammable materials. Also remember to let your work cool before handling it.


Skill Level & Time To...
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If you’ve soldered a copper pipe fitting and it develops a leak, you’ll need to take it apart in order to fix it. This isn’t a huge job. If you’ve been able to solder the copper pipe fitting together you’ll be able to take it apart. It only takes a few minutes to separate a soldered copper pipe fitting from the copper pipe. Be aware, however, that you do need to pay attention to detail.

Step 1 - Turn Off Water

Before you begin to separate the copper pipe fitting, you need to turn off the water to the house and make sure there’s no water in the line where you have to separate the fitting. Run the appropriate faucet until no more water comes through.

You can also empty all the pipes in the house running faucets in the upstairs bathroom and in the basement. Keep them going until no more waters flows, then turn off.

Step 2 - Propane

Position a heat-resistant cloth carefully behind the copper pipe fitting. It needs to be large enough to that any heat...

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