Xi’an Chancemate Petroleum Mechanical Co.,Ltd

API circulating sub

Product Name:

API circulating sub

No. :

Product Description

API circulating sub

API circulating sub

The circulating sub is connected between wellhead pipe string and ground circulating system. When casing is running or finished running, the circulating sub is connected to make fluid circulation. According to the application, the circulating sub is connected between Kelly and casing or between casing and hose. The former is used for fluid circulation during connecting of casing. The later generally is used after connecting of casing.

Construction of API circulating sub

The circulating sub during running casing is equipped with casing pin thread on one end or DP thread and DP box thread or union thread on other end.

specifications - circulating sub

Thread/ Model		I.D.(mm)	Length(mm)
Drill pipe box connection	Casing thread
NC38	5 BTC	57	500
	5 LTC
	5 ST & C
NC38	5 1/2 BTC	57	580
	5 1/2 LTC
	5 1/2 ST & C
NC50	7 BTC	71	600
	7 LTC
	7 ST & C
NC50	9 5/8 BTC	71	620
	9 5/8 LTC
	9 5/8 ST & C
NC50	10 3/4 BTC	71	670
	10 3/4 LTC
	10 3/4 ST & C
NC50	13 3/8 BTC	71	670
	13 3/8 LTC

Send your inquiry to email: sales@chancematewellcontrol.com, we are waiting for you.