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Old 09-15-2016, 03:48 AM   #1
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Default Calculating a simple offset vs. a rolling offset

In this sample, i'm confused as to how he find 24" for the Opposite?



How did he find 24" for the triangle? I wish this book explained it better



This is the next page, I still don't get it




For the first problem, Offset 37" and NPS 2". Find cut length

I can't find it for the life of me because I don't know how to calculate the hypotenuse properly.

Hypotenuse = Csc θ x Opposite
OR Hypotenuse = sec θ x Adjacent

How do you find the opposite side in the small triangle from the centerline triangle? Like on the first page, the opposite and adjacent sides were both 24". How was he able to calculate this?


So for instance, Offset 37" and NPS 2", how would I find the Hypotenuse when no sides are given? I need to hypotenuse/the Run to be able to calculate the cut length with the formula

Run - 2(T.O) - 2 gaps = cut length

Please help me someone I am studying to get NCCER certified and this is hard
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Old 09-15-2016, 05:38 AM   #2
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I tried solving one of the problems.

Offset: 63"

NPS: 14"

Find the cut lengths for these 45 offsets (the welder's gap is 3/32)

I keep getting stuck, I don't know what to do.
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Old 09-15-2016, 06:33 AM   #3
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Default Calculating a simple offset vs. a rolling offset

......
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Old 09-15-2016, 11:42 AM   #4
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Quote:
Originally Posted by needfittinghelp View Post
I tried solving one of the problems.

Offset: 63"

NPS: 14"

Find the cut lengths for these 45 offsets (the welder's gap is 3/32)

I keep getting stuck, I don't know what to do.
all the answers are in the intro section..............try there......
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Old 09-15-2016, 11:44 AM   #5
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Default Your making it way too complicated!

[QUOTE=needfittinghelp;

First pipe size does not matter, but you must know how to read a fitting.
You must know where the center mark is. To make it a little simpler lets use a fitting with a known stop like a plastic or copper 45. To use a steel pipe fitting you will have to know how your dies are cutting.

Lets take a 3" copper 45, the center of the fitting is where the lines on the photo cross. The measurement you need is from center to where the copper stops when entering, in this case it measures 1 and 1/8", You will be using 2 fitt's to make the offset 1-1/8 + 1-1/8 = 2-1/4 So the center lines of your offset is 63" x 1.414 [the known factor] = 89.08 - 2-1/4 = 86.83 [the length of your cut piece.
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Old 09-19-2016, 08:06 PM   #6
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[quote=PLUMBER_BILL;1019490]
Quote:
Originally Posted by needfittinghelp;

First pipe size does not matter, but you must know how to read a fitting.
You must know where the center mark is. To make it a little simpler lets use a fitting with a known stop like a plastic or copper 45. To use a steel pipe fitting you will have to know how your dies are cutting.

Lets take a 3" copper 45, the center of the fitting is where the lines on the photo cross. The measurement you need is from center to where the copper stops when entering, in this case it measures 1 and 1/8", You will be using 2 fitt's to make the offset 1-1/8 + 1-1/8 = 2-1/4 So the center lines of your offset is 63" x 1.414 [the known factor
= 89.08 - 2-1/4 = 86.83 [the length of your cut piece.


How would I find the cut length for a 45 degree elbow 2" pipe with a 37" offset?

And to find the take off I thought you had to do the 4-trick

2 divided by 2
1
.5
.25

then add the 2nd and 4th

isn't that how you find takeoff for a long radius ELL?
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Old 09-19-2016, 08:56 PM   #7
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You're over thinking this man.
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Old 09-19-2016, 09:39 PM   #8
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Way over thinking it. Forget about it for a while. Then take it up again. You'll have a "lightbulb" moment.
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Old 09-19-2016, 11:08 PM   #9
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Quote:
Originally Posted by needfittinghelp View Post
In this sample, i'm confused
Of course you're confused, you don't read/comprehend. You don't pay attention when a plumbing forum asks you for an introduction before you post. Post an intro and be an active member.
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Old 09-22-2016, 01:13 PM   #10
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Quote:
Originally Posted by Flyout95 View Post
You're over thinking this man.
Quote:
Originally Posted by Toli View Post
Way over thinking it. Forget about it for a while. Then take it up again. You'll have a "lightbulb" moment.
I'm sorry fellas, but I did the math here and I don't understand where I over thinked this, please highlight what I did wrong. Also, I take my NCCER test in the next 2 weeks, so I don't have time to wait as I have to study to get certified. Thank you so much.

Quote:
Originally Posted by Debo22 View Post
Of course you're confused, you don't read/comprehend. You don't pay attention when a plumbing forum asks you for an introduction before you post. Post an intro and be an active member.
I have read the older threads and they didn't help me at all which is why I am posting this one. I really need help

Please highlight what I did wrong, I attached my work that I did and I don't understand why my answer is different from the books answer

FIND THE CUTLENGTH FOR A 45 when the offset is 37" and the NPS is 2".

The answer in the book says 4'1 and 5/8 of an inch, my answer I got was 3.841 foot , what did I do wrong

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