1. Survey Results from 2014 presentation: Maintenance of Conditions/Change in Conditions Robbie Walker

2. Objectives: Review* survey results Encourage reflection** *see 2014 training for substantiations **contemplation, esp. if not in the majority

3. Question 1 You certify a tank as Atmosphere Safe For Workers. It has 20.8% oxygen and 0% LEL. The next day, you receive a phone call from a CP who claims the oxygen has risen to 21.9% oxygen. This is still within the acceptable range. The work is estimated to be complete within 1-2 hours. Would you allow the work to continue? Yes = allow work to continue. No = stop work; conditions have changed.

4. Question 1 Results

5. Question 2 A Marine Chemist Certificate has 20 spaces listed as Safe For Hot Work. A week later, 300 gallons of JP-5 floods one tank out of the 20 original spaces. The Competent Person tests and inspects the flooded tank and designates it as Not Safe For Hot Work. Does this void the entire Certificate?

6. Question 2 Results

7. Question 3 An engine room is certified Safe For Hot Work. Sometime later, a tank cleaning company opens a fuel tank in the engine room’s bilge. The fuel tank is half full of diesel. No fuel was spilled into the bilges during the cleaning process. Also, hot work was secured during the pumping and washing process. Did removing the fuel tank’s manhole cover void the Certificate?

8. Question 3 Results

9. Question 4 When writing a Certificate for a fuel tank as Not Safe For Hot Work, can a MC also include instructions that if the 100 gallons of diesel fuel is pumped out of the tank, and verified by the CP, then the tank can be treated as Safe For Hot Work without requiring another MC inspection and a new certificate?

10. Question 4 Results

11. Question 5 When writing a Certificate for a fuel tank as Enter With Restrictions, can a MC write instructions that if the 100 ppm diesel fuel vapors is ventilated out of the tank, and verified by the CP, then the tank can be treated as Atmosphere Safe For Workers without another MC inspection and new certificate? Recall Question 4: When writing a Certificate for a fuel tank as Not Safe For Hot Work, can a MC also include instructions that if the 100 gallons of diesel fuel {liquid} is pumped out of the tank, and verified by the CP, then the tank can be treated as Safe For Hot Work without requiring another MC inspection and a new certificate?

12. Question 5 Results

13. Question 6 A fuel tank (diesel) is certified Safe For Hot Work in order to repair a hull fracture. The next day, the MC receives a phone call and is told the repair has been completed. However, after bolting the manhole cover and air testing the tank, the repair still is leaking. Will bolting up a tank and performing an air test void the Certificate, even before determining whether or not any fuel come out of the piping?

14. Question 6 Results

15. Question 7 If a constant flow of inert gas is required to maintain an oxygen concentration <6% or 50% to support combustion, is disconnecting the inert gas supply hose for 5 minutes to change bottles change the conditions and void the Certificate?

16. Question 7 Results

17. Question 8 A MC initially certifies a habitable space Safe For Hot Work. A week later, the space is spray painted with a flammable paint. Three days after that, all the paint is dry. If the CP retests/inspects the space and finds the conditions as they were before spray painting, is the MC certificate still valid (not void)?

18. Question 8 Results

19. Question 9 The same day after a tank is certified by a MC as Atmosphere Safe For Workers – Safe For Hot Work, several welding operations produced a CO concentration of 110 ppm. Mechanical ventilation was on. Assuming the following engineering control will work, can the shipyard maintain the Marine Chemist Certificate by increasing the ventilation (adding another blower and duct) to bring the CO concentration to below 35 ppm and thus keep the Certificate from being voided? In other words, can the shipyard fix the problem without bring the MC back to issue a new Certificate?

20. Question 9 Results

21. Question 10 A tank barge has thin metal in the bottom of No. 1 Port cargo tank, near the forward port (outboard) corner. There is no heat transfer concern. All adjacent spaces have been properly treated i/a/w NFPA 306. You certify the tank Safe For Limited Hot Work to clad weld from the underneath side (barge is in dry dock). Three days later, the tank suction line located at the extreme diagonal (aft centerline, 45 feet from thin area) began to slowly leak, but now has stopped. The CP calls you on the phone to see if he can simply wipe up the leak and proceed with the repair they had not started yet. How much fuel (MAXIMUM) would you allow before telling the CP it is too much/it is a change in conditions/your certificate is voided and you will have to come back to recertify the tank. In all cases, the LEL is still 0%. Circle the MAXIMUM you would allow before your Certificate is void. None1 drop1 oz1 pt1 qt1 gal3 gal 5 gal10 gal25 gal (still 35 feet away)

22. Question 10 Results