# Bowen Casing Spear Calculator > Calculates load rating and failure modes for oil and gas casing spear systems. (iPhone/iPad app by NOV Inc..) - Source: https://appshunter.io/ios/app/bowen-casing-spear-calculator/id1458884228 (this page in markdown: same URL + `.md`) - Developer: [NOV Inc.](https://appshunter.io/developer/578550101) - Category: Business - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 12+ - Requires: iOS 9.3 · 42 MB - Released: 2019-08-03 - Data updated: 2026-06-20 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/bowen-casing-spear-calculator/id1458884228/reviews.md ## What is Bowen Casing Spear Calculator? NOV Bowen Casing Spear System Calculator helps to determine the overall load rating and mode of failure for the spear, mandrel, grapple, and casing in each application. The strengths in the instruction manual are based on the Mandrel tensile strength only and does not consider the entire system together. We are now able to model the entire system including Mandrel, Grapple, and Casing together. Our calculations were developed based on feedback from the field, various scale lab testing up to failure, and FEA models. Important assumptions: - We consider the catch range for the Grapple as well as API tolerances per API Specification 5CT - We always take the worst-case scenario as the maximum pull value (Grapple range or max API tolerance) since it results in lowest contact between Grapple and Mandrel Helix - Ratings are only valid if fish is within catching range of the Grapple. - Casing ID is calculated based on OD and Weight if those are manual inputs - For lighter casing weights, the casing contributes more significantly to reducing system ratings than it does for heavier weight casing which can asymptotically approach the publish Mandrel tensile strength in many cases Calculated values are theoretical yield strengths and are considered accurate to within +/-20%. They assume the worst case scenario based on API tolerance. All strengths assume straight and steady pulling of a fully engaged round fish. Any irregularities in the fish ID/OD, damage to the grapple or mandrel, or jarring can reduce the strength substantially. Ratings are based on Grapple range only. These values are presented without any safety factor. Please contact NOV Engineering if there are any questions. ## Key features - Load rating calculation - Mode of failure determination - System-wide modeling - Field feedback integration - Lab testing and FEA models - Worst-case scenario analysis ## Frequently asked questions about Bowen Casing Spear Calculator ### What does the Bowen Casing Spear Calculator do? The Bowen Casing Spear Calculator determines the overall load rating and mode of failure for the spear, mandrel, grapple, and casing in an application. It models the entire system, incorporating feedback from field experience, lab testing, and FEA models for comprehensive analysis. ### How accurate are the calculations provided by Bowen Casing Spear Calculator? Calculated values are theoretical yield strengths and are considered accurate to within +/-20%. These calculations assume the worst-case scenario based on API tolerance and straight, steady pulling of a fully engaged round fish. ### Does the Bowen Casing Spear Calculator consider API tolerances? Yes, the app considers the catch range for the Grapple as well as API tolerances per API Specification 5CT. It always takes the worst-case scenario as the maximum pull value, which results in the lowest contact between the Grapple and Mandrel Helix. ### What assumptions are made by the Bowen Casing Spear Calculator? Important assumptions include considering the grapple's catch range and API tolerances, always taking the worst-case scenario for maximum pull, and that ratings are only valid if the fish is within the grapple's catching range. Casing ID is calculated based on OD and Weight if those are manual inputs. ### What factors can reduce the strength calculated by Bowen Casing Spear Calculator? Irregularities in the fish ID/OD, damage to the grapple or mandrel, or jarring can substantially reduce the calculated strength. The ratings are based solely on the Grapple range and are presented without any safety factor. ### Is the Bowen Casing Spear Calculator available on multiple devices? The Bowen Casing Spear Calculator is available for iPhone, iPad, and iPod. It was released on August 3, 2019, and last updated on December 8, 2022, with version 1.1. ### What is the age rating for the Bowen Casing Spear Calculator? The Bowen Casing Spear Calculator has an age rating of 12+. This indicates it is suitable for users aged 12 and older. ### Does the Bowen Casing Spear Calculator have ads? No, the Bowen Casing Spear Calculator does not contain advertisements. It is a free application without any in-app purchases or ads. ## Version history (last 2 releases) ### 1.1 — 2022-12-08 The authentication in this version is new. The users will authenticate using Okta. ### 1.0 — 2019-07-31 No release notes. ## Apps similar to Bowen Casing Spear Calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [SnapScan 3D](https://appshunter.io/ios/app/snapscan-3d/id1660919119) | 5.0 (14) | Free | Business | | [OFS Resources](https://appshunter.io/ios/app/ofs-resources/id1339946928) | 4.8 (4) | Free | Business | | [PetroVue Mobile](https://appshunter.io/ios/app/petrovue-mobile/id1224612899) | 4.0 (5) | Free | Business | | [Cavare Motor Book](https://appshunter.io/ios/app/cavare-motor-book/id6469376017) | 5.0 (1) | Free | Business | | [Innova Portal](https://appshunter.io/ios/app/innova-portal/id1584378418) | — | Free | Business | | [ForeSite EDGE Mobile](https://appshunter.io/ios/app/foresite-edge-mobile/id1477221111) | — | Free | Business | ## More apps by NOV Inc. - [GP2GO](https://appshunter.io/ios/app/gp2go/id705178358) - [NOV Power Sections](https://appshunter.io/ios/app/nov-power-sections/id1079975011) - [Drill Bit Nozzle Calculator](https://appshunter.io/ios/app/drill-bit-nozzle-calculator/id1144121595) - [Max Drilling](https://appshunter.io/ios/app/max-drilling/id1184959427) - [NOV MonoVue](https://appshunter.io/ios/app/nov-monovue/id1522055242) All apps by NOV Inc.: https://appshunter.io/developer/578550101 ## Related topics [bowen casing spear calculator](https://appshunter.io/ios/topics/bowen-casing-spear-calculator) · [casing](https://appshunter.io/ios/topics/casing) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-20.*