__WHAT IS A ROLLING OFFSET?__Rolling offsets refer to the directional changes (both vertically and horizontally) that a pipe can make in a piping system.

__HOW TO CALCULATE THE TRAVEL PIECE FOR ROLLING OFFSETS__**1.**Determine the

**of the pipes in question. The rise refers to how high vertically the piping system goes. To figure out the rise, take a look at the side view drawing.**

__RISE__**a.**The height of the higher pipe from the finished floor to the center of the pipe is 47½ inches.

**b.**The height of the lower pipe from the finished floor to the center of the pipe is 16⅞ inches

**c.**Subtract the lower number from the higher number to get your

__RISE__.**i.**47½ - 16⅞ = 30 ⅝ inches

**2.**Next is to determine the

**. The roll refers to the horizontal distance between one end point and continuing until you reach the other end point. Let us now examine the plan (above) view drawing.**

__ROLL__**a.**The pipe farther away from the wall measures 50 inches.

**b.**The pipe closer to the wall measures 32 ⅜ inches

**c.**Subtract the lower number from the higher number to get your

**.**

__ROLL__**i.**50 - 32 ⅜ = 17 ⅝

**3.**

**Now to calculate for your travel piece, there are two methods:**

**a.**Square Root Method - √(

**ROLL**^{2}+

**RISE**^{2})

**i.**Insert your

**and**

__ROLL__**into the equation above and calculate using a calculator. This number is called your**

__RISE__

__ADVANCE__**1.**35.334561692485 ≈ 35 ⅜ inches

**ii.**Now multiply your

**by the constant for 45 degree offsets (1.414)[i]**

__ADVANCE__**1.**35 ⅜× 1.414 = 50.02025 inches ≈ 50 inches

2.

**Take off for 2 45s and now you have your travel piece. (Vic-45s take of 3 inches.)****a.**50 – 6 = 46 inches

**b.**Steel Square Method

**i.**Layout your

**and**

__ROLL__**on a square on the ground**

__RISE__**ii.**Diagonally measure between them

**1.**35 ⅜ inches should be your answer

**iii.**Now multiply your

**by the constant for 45 degree offsets (1.414)**

__ADVANCE__**1.**35 ⅜ × 1.414 = 50.02025 inches ≈ 50 inches

**2.**Take off for 2 45s and now you have your travel piece. (Vic-45s take of 3 inches.)

**a.**50 – 6 = 46 inches

*Practice Problems with answer sheets will Follow*

[i] If this was a rolling offset with 90s, the constant would be 1.

sorry brother fitter but you ganna half to fire the torch back up and cut 2in off that travel pice 50-6=44 not 46!!! the rest of your math was dead on thoe

ReplyDeleteLol right on

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