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Round thread • LTC/LC: Long round thread casing coupling
• STC/SC: Short round thread casing coupling
Buttress thread • BTC/BC: Buttress thread casing coupling
All three types has same thickness of the casing pipe body, just have different lengths.
The oil casing coupling is a necessary piece used to connect the two casing. The coupling manufacturing method is the same as seamless pipe. The steel pipe ends with internal thread to connect with the upper and lower casing. In order to ensure the joint tightness, the precision of screw thread is strictly required.
|
Casing Pipe Outside Diameter（In） |
Casing Pipe Outside Diameter（mm） |
Coupling Outside Diameter(mm) |
Minimum Length(mm) |
Diameter Of Recess(mm) |
Width of Bearing Face Regular (mm) |
Mass(Kg) |
|||||||||
|
Round (LTC /STC) |
BTC |
Round |
BTC |
Round (LTC/ STC) |
BTC |
Round (LTC/ STC) |
BTC |
Round |
BTC |
||||||
|
Regular |
Special Clearance |
STC |
LTC |
STC |
LTC |
Regular |
Special Clearance |
||||||||
|
4 1/2 |
114.30 |
133.35 |
133.35 |
123.82 |
158.75 |
177.80 |
225.42 |
116.68 |
117.86 |
7.14 |
6.35 |
5.24 |
5.96 |
6.89 |
3.48 |
|
5 |
127.00 |
147.32 |
147.32 |
136.52 |
165.10 |
196.85 |
231.78 |
129.38 |
130.56 |
7.14 |
7.14 |
6.43 |
7.86 |
8.38 |
4.00 |
|
5 1/2 |
139.70 |
160.02 |
160.02 |
149.22 |
171.45 |
203.20 |
234.95 |
142.08 |
143.26 |
6.35 |
7.14 |
7.34 |
8.92 |
9.30 |
4.47 |
|
6 5/8 |
168.28 |
187.71 |
187.71 |
177.80 |
184.15 |
222.25 |
244.48 |
170.66 |
171.83 |
6.35 |
6.35 |
9.12 |
11.34 |
11.01 |
5.65 |
|
7 |
177.80 |
200.03 |
200.03 |
187.32 |
184.15 |
228.60 |
254.00 |
180.18 |
181.36 |
7.94 |
7.94 |
10.88 |
13.92 |
13.98 |
6.28 |
|
7 5/8 |
193.68 |
215.90 |
215.90 |
206.38 |
190.50 |
234.95 |
263.52 |
197.64 |
197.23 |
5.56 |
7.94 |
12.16 |
15.63 |
15.82 |
9.29 |
|
8 5/8 |
219.08 |
244.48 |
244.48 |
231.78 |
196.85 |
254.00 |
269.88 |
223.04 |
222.63 |
6.35 |
9.52 |
15.62 |
21.67 |
20.86 |
10.80 |
|
9 5/8 |
244.48 |
269.88 |
269.88 |
257.18 |
196.85 |
266.70 |
269.88 |
248.44 |
248.03 |
6.35 |
9.52 |
17.85 |
25.45 |
23.16 |
12.02 |
|
10 3/4 |
273.05 |
298.45 |
298.45 |
285.75 |
203.20 |
-- |
269.88 |
277.02 |
276.61 |
6.35 |
9.52 |
20.58 |
-- |
25.74 |
13.39 |
|
11 3/4 |
298.45 |
323.85 |
323.85 |
-- |
203.20 |
-- |
269.88 |
302.42 |
302.01 |
6.35 |
9.52 |
22.43 |
-- |
28.03 |
-- |
|
13 3/8 |
339.72 |
365.12 |
365.12 |
-- |
203.20 |
-- |
269.88 |
343.69 |
343.28 |
5.56 |
9.52 |
25.42 |
-- |
31.77 |
-- |
|
16 |
406.40 |
431.80 |
431.80 |
-- |
228.60 |
-- |
269.88 |
411.96 |
410.31 |
5.56 |
9.52 |
34.33 |
-- |
40.28 |
-- |
|
18 5/8 |
473.08 |
508.00 |
508.00 |
-- |
228.60 |
-- |
269.88 |
478.63 |
476.99 |
5.56 |
9.52 |
53.33 |
-- |
62.68 |
-- |
|
20 |
508.00 |
533.40 |
533.40 |
-- |
228.60 |
292.10 |
269.88 |
513.56 |
511.91 |
5.56 |
9.52 |
42.81 |
56.98 |
50.10 |
-- |
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