1. Multilayer screen

2. Material: 201 304 304L 316 316L Q235

3. Another name: Pipe base screen

4. Screen jacket: Johnson type screen

5. Base pipe: Perforated pipe

6. Connection type: STC, LTC, BTC threaded

7. Bubble bag, wooden pieces wrapped the Johnson screens

Pipe Base Screens pipes are used for oil and water exploiting.

Characteristics:

~ Pipe Base Screens consist of two screens or multilayer screen

~ Perforated pipe inside , with perforations wrapped by the outside Johnson type screen

~ The screen jacket and base pipe are welded together with a length of coupling.

~ The base pipe can be made of seamless pipe or welded pipe, and more often, casing pipes.

~ ID of Johnson type screen equals OD of the perforated pipe.

Base Pipe Technical Specification (Standard API 5 CT)
Size	Outside Diameter		Inside Diameter		Grade	Wall Thickness
	in	mm	in	mm		in	mm
4-1/2	4.500	114.30	4.000	101.60	J55K55N80	0.250	6.35
			3.920	99.57	J55K55N80	0.290	7.37
5	5.000	127.00	4.408	111.96	J55K55N80	0.296	7.52
			4.276	108.61	N80P110	0.362	9.29
			4.126	104.80	N80P110	0.437	11.10
5-1/2	5.500	139.70	4.892	124.26	J55K55N80	0.304	7.72
			4.778	121.36	N80	0.361	9.17
			4.670	118.62	N80	0.415	10.54
7	7.000	177.80	6.366	161.70	J55K55N80	0.317	8.05
			6.276	159.41	J55K55N80	0.362	9.19
			6.184	157.07	N80	0.408	10.36
9-5/8	9.625	244.48	8.755	222.38	N80	0.435	11.05
			8.681	222.50	N80	0.472	11.99
10-3/4	10.750	273.05	10.050	255.27	H40J55K55N80	0.350	8.89
			9.850	250.19	J55K55N80	0.450	11.43
13-3/8	13.375	339.72	12.615	320.42	J55K55	0.380	9.65
			12.415	315.34	J55K55N80	0.480	12.19