Technical Diving Skills – Valve Shutdown Drill Explained

This article, posted at Dive DIR, provides a very clear explanation of valve shutdown drills for isolated manifold doubles/twinset cylinders.

Great reading, if you are thinking about technical diving or just doing recreational scuba dives with doubles cylinders.

Technical Diving Skills

www.divedir.com

A sample:

Tuesday, 02 November 2010 17:39
This article outlines the process and reasoning behind the GUE approach to a valve drill.

Process Summary

 

The basic valve drill involves closing and opening all three posts on a twin set starting with the right post, then the isolator, then the left post.

 

 

First of all, here’s what it is supposed to look like….

 

 

 

Process Details

  • Signal to your team you are going to perform a valve drill
  • Wait until your team is in place and then continue
  • Purge backup regulator
  • Shut down the right hand post whilst simultaneously signalling you are manipulating a valve to your team
  • When the post is shut down, breathe down the regulator until it “locks”.
  • Remove the regulator and replace with your backup regulator
  • Clip off your primary regulator on the right chest D ring
  • Open the right post
  • Unclip the primary regulator and purge it
  • Remove the backup regulator from your mouth and replace with the primary regulator
  • Shut down the isolator whilst simultaneously signalling you are manipulating a valve to your team
  • When the valve is closed, re-open the isolator
  • Move your torch to your right hand
  • Shut down the left hand post whilst simultaneously signalling you are manipulating a valve to your team
  • When the post is closed, purge the backup regulator until it “locks”
  • Open the left post and purge to confirm it is working
  • Move the torch to your left hand.
  • Check the position of your right hand post
  • Check the position of your isolator
  • Move the torch to your right hand and check the position of your left post
  • Signal that your drill is complete

 

Originally posted 2011-08-12 14:25:25. Republished by Blog Post Promoter