Difference between threads????
Difference between threads????
(OP)
After recently graduating I have started working offshore and I do not know the difference between threads.
Please give me some advice on how I can tell the difference. I need even the basics, such as how you measure the diamter (inner box/outerbox/back of pin????). IF, FH, VAM EIS is all new to me. Or if you could give me any sites which explain it that would also be good.
Thanks
Please give me some advice on how I can tell the difference. I need even the basics, such as how you measure the diamter (inner box/outerbox/back of pin????). IF, FH, VAM EIS is all new to me. Or if you could give me any sites which explain it that would also be good.
Thanks





RE: Difference between threads????
RE: Difference between threads????
RE: Difference between threads????
ih8wk:
I would suggest a google search on pipe thread definitions, I came up with:
h
http://mdmetric.com/tech/tict.htm
http://www.drews-plumbing.com/glossary.html
To name just a few. You may want to google the Tips site as well, it may have come up on here before.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: Difference between threads????
Latest versions of the Machinist Handbook has a good deal of helpful info. on threads ( english and metric). Such rather inexpensive book should be part of your library.
RE: Difference between threads????
RE: Difference between threads????
http://www.vetcogray.com/main/main.cfm
http://www.drilltec.com/
http://www.dril-quip.com/
http:/
http://www.huntingoilfield.com/
http://www.hydril.com/
http://www.jfe-holdings.co.jp/en/
h
http://www.vampts.com/
http://www.tenaris.com/en/default.asp
They have both tubulars and pipe connections.
RE: Difference between threads????
RE: Difference between threads????
Te main diference between API and premium conection is that the second one has a shoulder where the pipe make seal to the coupling. Therefore the make-up is made by torque and toque-shoulder
Api has no shoulder so the make-up is made only buy torque
To diferentiate the premium conections you have to see TPI, and seal area shape.
To diferentiate API conections the kind of thread, round or square (BUTTRESS).
Any further question please ask.
RE: Difference between threads????
For drillpipe connections
IF
FH
Reg
Get with smith drilco. They should be able to give you a thread gauge that you can carry around with you. Also they have a real good drill collar/drill pipe inspection book. If you work for the drilling contractor ask you company man to get you one. If you are the company man then call smith drilco and tell them to send one to the heliport for you. I cant tell them apart either and yes it is a pain when looking at XOs.
For XT HT grant prideco specialty connections it just takes time but there are some difference. They have pictures on their website.
Casing connections are a bit more tricky. Usually they are stenciled on the side of the casing or on the thread protector. That said things could be mis-stenciled or labeled wrong. One thing to always check is the FLOAT EQUIPMENT. Take the shoe or collar out and actually screw it into the casing if you can to double check of course with anything bigger than 9-5/8" casing this is tough unless you are willing to take steroids. At a minimum take off the thread protector and screw it into the float equipment.
RE: Difference between threads????
Casing and tubing connections come in two main types: API connections (8 round and buttress) which rely on dope to make a seal, and premium connections from a whole host of casing manufacturers that don't and instead have a metal to metal seal, either via a step in the middle of the thread or at the pin. API connections are made up to a marker on the joint, premium connections are made up to a specific torque, and correct make up is checked with a torque- turn graph.
All you really need to know on the rigsite about casing & tubing connections is what the torque rating is (if you think you might have to rotate the casing string) and for premium connections what the required make up torque is and what the make up loss in length is. For Engineering, you need to know the tensile and rotational strength of the connections (it's almost always less than the strength of the pipe) and choose your connection according to the design stresses on the casing and whether you have any corrosive fluids present. The various manfacturers' websites have lots of infomation on their connections and connection selection. Often different brands of casing connections are more common in certain areas: VAM's connections are ubiquitous in the North Sea, whereas Hunting's connections are probably more common in the Gulf of Mexico.
Finally, there are the large diameter threads for top hole casing (36", 20" etc) that are solely designed to be made up quickly (Vetco's RLS4, and so on).