# ESDD NSDD

> ESDD NSDD (iPhone/iPad app by Electric Power Research Institute.)

- Source: https://appshunter.io/ios/app/esdd-nsdd/id1189639245 (this page in markdown: same URL + `.md`)
- Developer: [Electric Power Research Institute](https://appshunter.io/developer/489519295)
- Category: Reference, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 114 MB
- Languages: English
- Released: 2017-01-29
- Data updated: 2026-06-10
- User reviews in markdown: https://appshunter.io/ios/app/esdd-nsdd/id1189639245/reviews.md

## What is ESDD NSDD?

ESDD App aids field personnel calculate the Equivalents Salt Deposit Density (ESDD), the Non-soluble Deposit Density (NSDD) and Directional Dust Deposit Gauge Calculations (DDDG) of high voltage insulators based on solution conductivity, filter weight, solution temperature and insulator surface area.


## Version history (last 5 releases)

### 4.0.1 — 2022-02-25

Library updates. Minor bug fixes.

### 4.0 — 2020-11-26

This version includes some minor bug fixes and puts limits on calculation parameters that prevent invalid results.

### 3.0 — 2020-02-17

Version 3.0 adds Directional Dust Deposit Gauge Calculations (DDDG).

### 2.0 — 2018-12-19

Version 2.0 adds the ability to capture and store field data over multiple readings and multiple sites. This data is stored in the cloud and can be recovered if the app is deleted or a device is replaced. This version also adds the ability to plot historical data graphically using several different graph formats.

### 1.1 — 2017-07-19

Instructional Videos for registered users.

## More apps by Electric Power Research Institute

- [Field Guides](https://appshunter.io/ios/app/field-guides/id1215353929)
- [TD&S Guide](https://appshunter.io/ios/app/td-and-s-guide/id1278391054)
- [EPRI - Global Forum](https://appshunter.io/ios/app/epri-global-forum/id1462916387)
- [CSTARR Digital Assistants](https://appshunter.io/ios/app/cstarr-digital-assistants/id1548827198)

All apps by Electric Power Research Institute: https://appshunter.io/developer/489519295

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*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 2026-06-10.*