Pressure Testing the ROV

Le Wed 01 June 2016

I was finally able to test the ROV in New Zealand Diving and Salvage's decompression chamber. Dissapointingly the ROV leaked at pressure and so there is a need for some redesign for some of this. This page describes the pressure test and presents the results.

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Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Pressure / Seals /

Autres articles

A Simple Pressure and Temperature Logger

Le Tue 23 February 2016

This article describes a simple logger arrangement that measures pressure and temperature from two pressure sensors; a BMP180 barometer for when things go right, and an MS5803-14BA high pressure sensor for when things go wrong. This logger will be installed inside the ROV shell in place of the control electronics to record the internal pressure while the ROV is subjected to design pressures in a dive decompression chamber. This will show up if there are any leaks. If the pressure rises then there is a problem.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Arduino / Pressure / Electronics / CSV / Sensors /

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Arduino Library Collection

Le Thu 21 January 2016

Throughout my various Arduino-based projects I have made use of quite a number of excellent libraries that are not part of the standard Arduino IDE. To future proof these projects against the original sources of these libraries disappearing or updated libraries not working for these projects I have collected up the various libraries I have used and will host them here. In the first instance I would suggest going to the original sources for these libraries for the most up to date versions. The versions I am hosting here will not be updated.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Arduino / Pressure / Electronics / Sensors / Communication / Playstation / PS2 / Serial / I2C /

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A Simple Arduino Based Logger

Le Tue 19 January 2016

This article describes a very simple Arduino based logger for capturing temperature data and recording it to a MicroSD card. It is intended as a building block for another logger project that will include pressure measurements for use during an in-air pressure test for the ROV project.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Arduino / Pressure / Electronics / CSV / Sensors /

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A More Refined Wire Sealing Technique

Le Thu 27 August 2015

I am the first to admit the method for making wire bundle seals for the ROV that I described earlier was pretty ugly. Having made and tested several more seals based on the wax cast epoxy resin plug method, I have refined the technique a little to be a little easier and somewhat more tidy.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Pressure / Seals /

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Investigations into Wire Sealing Methods

Le Fri 17 July 2015

I am pleased to say that I have finally managed to come up with a method of getting the bundles of wires through a large cable gland without the water getting through as well. This method has been tested with a 5 bar pressure difference across it to simulate a depth of 50m. The test method is described on the “Pressure Testing Rig for ROV Seals” page. The various test pieces used in this development were all subjected to 5bar pressure and held at that pressure for a minimum of 30 minutes. The successful method makes use of an epoxy resin plug which encapsulates the wires.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Pressure / Seals /

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Pressure Testing Rig for ROV Seals

Le Mon 15 June 2015

In order to get the wires from outside the ROv to the inside without the water getting in as well, I am intending to use a proven industrial technique which makes use of Cable glands. The one's I have to hand are rated to 50m, but 100m ones are available too. The challenge is that I intend to run the punches of small wires through an outer sheath that the cable gland will be acting on. I have built the pressure test rig described here to simulate the effect of depths of 50m on the methods I use to seal the smaller wires into the sheath.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Pressure / Seals /

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ROV Shell Analysis

Le Mon 22 September 2014

A critical part of an ROV is the shell – surprised?. It must withstand the pressure at the target depth as well as not be so heavy that it sinks. This page looks and the analysis used to determine the material and pipe dimensions used for the ROV shell.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Pressure /

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ROV Seals

Le Sat 20 September 2014

One of the signficant challenges in ROVs is making a reliable seal. For this ROV Static Face seals have been designed that will ensure the seal becomes stronger as more external pressure is applied. This page provide the dimensions of the gland on the main shell and the seal size.

Par Hamish Trolove, Catégorie : Tech Projects

Tags : ROV / Pressure / Seals /

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