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!
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Blockline Loadings, release 5, issued 24 April 2008. WORK 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. The PDA version removes all text and formats the input and output fields for optimum viewing on a mobile, small-screen device.
1″ 6×19 IPS IWRC1″ 6×19 EIPS IWRC1.125″ 6×19 IPS IWRC1.125″ 6×19 EIPS IWRC1.25″ 6×19 IPS IWRC1.25″ 6×19 EIPS IWRC1.375″ 6×19 IPS IWRC1.375″ 6×19 EIPS IWRC1.5″ 6×19 IPS IWRC1.5″ 6×19 EIPS IWRC1.625″ 6×19 IPS IWRC1.625″ 6×19 EIPS IWRC1.75″ 6×19 IPS IWRC1.75″ 6×19 EIPS IWRC1.875″ 6×19 IPS IWRC1.875″ 6×19 EIPS IWRC2″ 6×19 IPS IWRC2″ 6×19 EIPS IWRC
Either; select a blockline
OR, enter wire breaking strength
Number of lines strung. Nbl =
Safety factor required for the blockline. SFbl =
Select a block bearing type to determine API friction factor
What is the maximum crown load (eg derrick limit)? Fcllimit =
Travelling block weight. mtb =
Desired load carried under the travelling block. Fhlbb =
Click here when any values are modified to update the result.
1 – limits of the line and derrick; the limiting
Wire rope strength
Maximum hook load (including travelling block)
Maximum useable hook load (accounting for block)
2 – loads arising from the desired load under the travelling block, or
Fast line load
Dead line load
Safety factor on the fast line
Specified hook load as % of maximum
Institut Francais du Petrole. “Drilling Data Handbook” 6th Edition.
Release 1 of this worksheet was issued on 18 April 2008.