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What is the Difference Between a 45-Degree & 90- ...

27 May.,2024

What is the Difference Between a 45-Degree & 90- ...

Pneumatic conveying elbows are responsible for changing the flow direction of materials within your dry bulk handling system. Pipe elbow dimensions &#; including degree, line size, and centerline radius &#; affect the speed and efficiency of product transfer as well as the effect your system has on that material. Making sure you choose the right components helps you improve your productivity while maintaining high quality.

Contact us to discuss your requirements of 45 Degree Elbow Pipe Bend. Our experienced sales team can help you identify the options that best suit your needs.

While the difference between a 45-degree elbow and a 90-degree elbow seems obvious, these two options have very different effects on conveying. Here, we explore the benefits and drawbacks of each component to help you optimize your pneumatic conveying system.

45-degree pneumatic conveying elbows

What is a 45-degree elbow?

A 45-degree elbow is a fitting that changes the direction of material flow within your pipelines by 45 degrees.

Benefits of a 45-degree elbow

The shallower angle of a 45-degree elbow reduces product impact against the pipe wall. This protects both your components and dry bulk material from damage. It also reduces the amount of energy and speed lost during transfer, lowering the energy requirements of your system.

Drawbacks of a 45-degree elbow

While a 45-degree elbow reduces impact damage, it&#;s more susceptible to abrasion. As well as contributing to plastic streamers or grain friability, this can cause your elbow to wear away more quickly. The shallow angle also means your system is likely to take up more space, which can be problematic for smaller factories.

90-degree pneumatic conveying elbows

What is a 90-degree elbow?

A 90-degree elbow creates a joint between two pneumatic conveying pipes at right angles to each other. For this reason, a 90-degree elbow is sometimes called a quarter bend.

Benefits of a 90-degree elbow

With its sharper angle, a 90-degree elbow allows less time for dry bulk material to scrape along the pipe interior. This reduces the risk of abrasive damage to the elbow and the material, helping you maintain high product quality and reducing maintenance time and costs. The ability to quickly change from horizontal to vertical movement (or vice-versa) also means you can design a smaller, more compact pneumatic conveying system.

Drawbacks of a 90-degree elbow

The quick change in direction in a 90-degree elbow puts it and your materials at greater risk of impact damage. As heavier materials slam into the pipe, they also lose energy and speed. To compensate, more power is required to keep dry bulk materials moving through the pipelines.

Is a 45-degree elbow better than a 90-degree elbow?

Which degree of pneumatic conveying elbow you choose for your system will depend on the kind of material you convey. Since a 45-degree elbow has greater impact resistance, it might be more suitable for heavier materials like coal or mining products. On the other hand, the abrasion-resistant qualities of a 90-degree elbow make it a good fit for plastics, foodstuffs, and fine powders.

But no matter what you convey, one of the most influential factors in your decision will be your available floor space. If you have room to spare, the greater spatial requirements of a 45-degree elbow won&#;t be a problem. If space is limited and you need a compact system, a 90-degree elbow might be better.

How to calculate pipe elbow dimensions

Purchasing a pipe elbow with the wrong dimensions can seriously disrupt your operations. You might experience greater abrasive wear, product degradation, and system downtime, all of which increase costs and reduce profitability.

That&#;s why we&#;ve prepared a handy elbow dimension calculator that can give you accurate measurements in seconds completely free. Simply input the measurements you already know and the calculator will confirm the rest.

And if you need help measuring a pneumatic conveying elbow, this short video will tell you everything you need to know:

Optimize your system with ultra-strong custom elbows from Progressive Products

For more than 40 years, we&#;ve been making durable, long-lasting, cost-effective pneumatic conveying elbows that help companies in all industries enhance their productive capabilities. Each one is highly abrasion resistant and can stay in place for a long time without being replaced. That means you can enjoy lower costs, greater uptime, and increased efficiency, all without changing line flow.

And the best part? Every elbow we manufacture is available in both 45 and 90 degrees!

Check out our range of elbows online now to find the best fit for your system and products, or contact our friendly expert team to arrange custom manufacturing for specialist components.

45 vs 90 degree elbows [Archive]

View Full Version : 45 vs 90 degree elbows

longhorn_reef

I am designing my plumbing layout (1" and 1.5" PVC). Does anyone know if there a significant reduction in head loss achieved by using 2 45s vs. a 90 degree elbow? I am wondering if the extra space & effort required to use 45s would pay off in the long run.

Thanks

BrokeColoReefer

degrees is degrees, same restirction through 2 45's as 1 90. At least in the venting world thats true.

Reeforbust

What would be easier to do.......Make a sharp 90 degree turn in your car or make two 45 degree turns. You would have to slow down on the 90 degree.
From my experience, 45's flow better than 90's because the water doesn't hit a "wall" and then have to change direction instantly. They will all get the job done and if you don't need every ounce of flow out of your plumbing, I would go with what is easiest for you.

areze

I believe the 45s are better, the dynamics of the water passing through will be smoother and thus less restrictive in the 45degree bend. it wont be an OMG difference, but it may be worth while if you have the room.

joedirt

I'm gonna say opposite you guys on this one. For some reason I want to say the flow coeffient of a 45 is slightly more than 1/2 of the coefficent of a 90. Thus if you have 2 45's you are exceeding that of a single 90.

I don't have any data to back this up, but maybe I'll look later.

dannieboiz

good stuff, just tagging along to see result... any updates?

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thrlride

When doing the headloss calculator using 45's takes away more flow than 90's. Not much difference though. For instance, using 2 45's vs 1 90 made you lose 1 gph. Using 6 45's vs 3 90's made you lose 3 gph.

Reeforbust

But a 90 gives you more turbulence in the real world.............

BrokeColoReefer

simple math IMO, when figuring gas plubling, gas venting, wood chimneys, you calculate 2 45 = 1 90 for restriction purposes. I have no idea how water reacts. Just makes logical sense to me that it would be the same. I woud think the curve surface area are the same in both instances, who cares if it goes throug a 45, then runs a while then another 45, same curve, same surface area. IMO. The differance is so little i wouldnt think it would matter. At least im not all alone on this line of thought.
Ryan

bvoss

Spaflex makes the whole argument kinda mute.

Kinetic

what's spaflex?

Neo-Fight

I don't think you can simply add the angles of the 2 (or more) elbows and say that 1 90 elbow is equivalent to 2 45s, in terms of head loss. Consider that if you use flexible tubing to go from a horizontal outlet to a vertical outlet, you just made a 90 degree turn - it just had a very large radius.
Popular opinion (not that it is always right, mind you) says that a large radius (less turbulence, backpressure) 90 degree turn using flexible tubing would create less headloss than a 90 degree pvc elbow. I would then conclude that 2 45s would create less turbulence and backpressure than a single 90.

theatrus

Fluid mechanics is complex stuff ;)

And I seriously don't feel like digging out the textbook and figuring this one out. In the short end, 2 45s is probably not going to give you much advantage over a single 90.

bvoss

Spaflex is flexible PVC. I used it on my last tank and it made it big difference in flow. You glue it like PVC using conventional fittings, but it bends to a pretty reasonable radius. You end up with a fes sweeping curves instead of lots of little turns and jogs.

You can get it a most pool stores.

BrokeColoReefer

C-mon someone has to set the record strait!
BUMP

tokitay

Originally posted by BrokeColoReefer
degrees is degrees, same restirction through 2 45's as 1 90. At least in the venting world thats true.

Here's a little plumber input: Two 45's will definitely have less restriction than one 90 (except in venting, it does not matter). Having said this, the difference is not really that big (when pumping water).

If you have the room, use two 45's. If it is really tight, stick with 90's.

tacocat

Try using sweepers instead of elbows.

Sweepers
http://i3.photobucket.com/albums/y58/ZevinLauren/flow.jpg

joedirt

OK here it is. The flow coefficient or minor loss of a 90 is .25, while a 45 is .42

Using the formula to calculate equivelent straight length pipe vs. a bend,

KD/f=L
K = Coefficient
D = Diameter
f = friction loss using a generic .02

traveling through a 45 is equivelent to 21" a 90 is equivelent t0 12.5" so if you use 2 45's cut that by 1/2 and you have 10.5" which is less than the single 90.

basicly to push water through 2 45's is the same as pushing it through 10.5" of pipe, you can get 2" more pipe passing through a single 90, making the 90 more efficient.

now there are alot of other factors that can effect this but for all intensive purposes 90's are better.

longhorn_reef

Sweepers...now that looks like a good idea, looks like a long-radius elbow that would flow much better than standard 90, but I've never seen those before. Any idea where they are sold and if they're available in 1" and 1.5"?

Thanks

ol'reefer

I would go with two 45's.

tygger

I dont know either, but when I was doing my plumbing, I used 2 45's when possible.

BrokeColoReefer

is there a easy way to calculate head loss? lets say you have a gph pump and you have 4 90's hooked rite to it, any idea what the output would be? is there a typical GPH deduction (percentage wise)per elbow?
Ryan

Kinetic

sweepers can be found on www.savko.com

tacocat

They are also called 90* long turn elbows. Old Yeller Tang gave me this link.

http://acmehardware.com/pd--1-12-90deg-Pvc-Lsw-El.aspx

longhorn_reef

Thanks for the links on the sweeper fittings! I noticed that these appear to be drain fittings rather than schedule 40, so I wonder if they are safe to use on the return (high pressure) side of the system. Tacocat's pic above looks like a good application but I wonder about using say between the pump discharge and say a partially closed ball valve where the fitting might see some pressure?

Reeforbust

I wonder if they are safe to use on the return (high pressure) side of the system

Anything will work.....You don't have that much pressure.....:)

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