Wireline on Drum - Audit
NOTICE: Our Mathcad database got attacked and infected with a virus. Unfortunately, we've had to shut it down until further notice.
You can safely browse the pages, as the Mathcad server was separate to this main website, and was only accessible here. (We used something called an iFrame, which is like a window into a different website).
UPDATE 28th of January 2020: the virus happened just over a week ago. We've temporarily cut and pasted the text parts of the Mathcad pages rather than having blank pages there.
UPDATE 3rd of February 2020: We've been unable to recover the Mathcad worksheets and offer them in a format that provided total security to users. They were published a decade ago, and our IT people say that they would need a complete re-creation with the latest code and security fixes.
APPEAL: These 44 pages were created, and offered as a free resource for over a decade. We know from our website analytics that more than 1000 users visited each month. If only half of these regular visitors donated $20, we would have enough to create an even better solution. As you know, time is money, have these Mathcad pages saved you $20 in time over the years? We expect that they have, not to mention the learning opportunities provided to new engineers entering the industry.
Please, donate at least $20 as a one-off payment, to bring back the drillers Mathcad back as an always free to use resource!
YES! I've gotten value from the drillers Mathcad in the past, and a $20 is a very affordable way of saying thanks. I also want to preserve this tool for future engineers.
NO! I can't or won't donate to the restoration fund. I'm happy to spend a few minutes to offer a testimonial to help encourage the effort. These worksheets do have value. Offer Feedback.
Wire on drum, release 1, issued 13 January 2009. AUDIT version.
The current release of this worksheet exists in different versions. They are identical apart from the way they are formatted. The Work version hides intermediate calculations and allows the user to see the results just below the inputs. This is useful for quick “what-if” games, changing various inputs to see what works best. The Audit version displays all intermediate calculations.
This worksheet takes inputs of drum and wire rope sizes and number of full and partial wraps and estimates the total length of wire on the drum. If height of sheave and number of lines strung is also entered, will calculate the total length of wire.
Drum diameter. L_Ddrum =
Drum length. L_Mdrum =
Wire rope diameter. L_Dwr =
Number of complete layers of wire rope (max 10). Clayers =
Number of wraps on top layer. Cwraps =
Optionally – height from drum to upper sheave(s). L_Mfl =
Assumes that the block is at the table.
and number of lines strung. Cwr =
Click here when any values are modified to update the result.
Calculate number of complete wraps on a full layer
Calculate wire on each layer up to 11 (max 10 full layers plus one partial layer).
Total up all the layers.
Calculate the line between drum and deadline anchor. Assume sheave diameter = 25 times rope diameter.
Calculate the total wire rope length.
Total wire rope on the drum
Wire rope between deadline anchor and drum
Total wire rope length on drum and in derrick
Version 1 of this worksheet released on 13 January 2009 by Steve Devereux CEng.