Term
| offshore platforms undergo thorough inspection how often |
|
Definition
| every 5 years if not sooner |
|
|
Term
|
Definition
| are more weightless in water and are actually more mobile to find cracks, and have little gravitational forces |
|
|
Term
| temper beads to reduce stresses |
|
Definition
| should be applied in less that one minute |
|
|
Term
| the higher the surrounding pressure or temperature |
|
Definition
| the greater the potential for gas to be absorbed into the weld |
|
|
Term
|
Definition
| pneumatic or hydraulic machines which apply considerable pressure and spin at high speed |
|
|
Term
| 5 main categories or types of underwater welding |
|
Definition
-one atmosphere
- habitat
- dry spot
- wet welding
- chamber |
|
|
Term
| 3 difficulties of wet welding |
|
Definition
- hydrogen and oxygen gasses
- visibility
- quenching and hardening of the weld |
|
|
Term
| how to do a polarity test |
|
Definition
| Put ground and electrode in bucket of salt water. Make switch hot. Should see bubbles coming from end of electrode. Indicates electrode negative or straight polarity |
|
|
Term
| type of knife switch used for underwater welding |
|
Definition
|
|
Term
| what are dogs and wedges and how are they used |
|
Definition
| dogs are tacked into place and wedges are hammered in. used to keep a metal plate in place during welding |
|
|
Term
| whats the most serious concern of a gas build up and how is it formed |
|
Definition
| the build up of oxygen and hydrogen. the electric arc causes the h2o molecules to split into hydrogen and oxygen. can lead to violent explosions. |
|
|
Term
| when is the only time a diver/welder should ask to make it hot |
|
Definition
| when the diver is ready to strike an arc. make it cold when the weld is finished or when repositioning |
|
|
Term
| if the topside tender does not understand any communications from the diver. what should the plan of action be |
|
Definition
| make it cold. until diver is understood. reestablish comms by means of line pulls. |
|
|
Term
| what does s.p.a.r stand for ? |
|
Definition
| submersible pipeline alignment rig. can be fitted with a hyperbaric or one ATM habitat for welding |
|
|
Term
|
Definition
- cleaning pigs
- inspection pigs
- blow up pigs
- scraping
- brush
- swab |
|
|
Term
| what should be worn under neoprene gloves when welding |
|
Definition
| medical or inspection latex gloves or dish gloves |
|
|
Term
| Why would you inspect pipe or a structure |
|
Definition
| due to ice collisions,corrosion,action of wind and waves |
|
|
Term
| When welding a patch the patching material should be how much bigger than the hole or damage |
|
Definition
| 50% bigger than the affected area |
|
|
Term
|
Definition
| just as good as a surface weld |
|
|
Term
|
Definition
| same strength some defects allowed |
|
|
Term
|
Definition
| scalloped sleeve spreads pressure on welds in all directions |
|
|
Term
|
Definition
| sea pack, sea-weld, sea jet, sea cut, tuff coat, sea dragon- is the worst underwater rod |
|
|
Term
|
Definition
| underwater rod- hydroweld FS highest quality |
|
|
Term
|
Definition
| german - nautica most user friendly uw rod |
|
|
Term
|
Definition
|
|
Term
|
Definition
U/W welding rods
.softouch
.easytouch
.nitouch- nickle |
|
|
Term
|
Definition
| welding and cutting done at normal pressure (Coffer dam) |
|
|
Term
|
Definition
| hyperbaric welding habitat. Dive dress not required |
|
|
Term
|
Definition
| chamber fitted over pipe or area to be welded. Water is pushed out by adding air. Has relief valve on top and can have vent for fumes. Diving dress is required |
|
|
Term
|
Definition
| Ensures only weld area and stinger/electrode are dry. Diving dress required |
|
|
Term
|
Definition
|
|
