Pipestop-100 Linestop Machines and Equipment

The Pipestop 100 is a lightweight piece of equipment that is easily used for stopping low-pressure lines, 4" - 12", on most types of pipelines and fluids.

Maximum line pressure: 100 psi. Maximum Temperature: 350° F (121° C)

Step-by-step
A special line stop fitting is installed on the pipeline either by welding or using a mechanical seal. After pressure testing, a temporary valve is installed onto the fitting.

First, a hole is made in the pipe with a special cutter. When the pressure tap is completed, the cutter and coupon are retracted into the tapping machine and the temporary valve is closed. If bypass taps are required, they are also made at this time.

The tapping machine is removed from the temporary valve and is replaced by a line stop machine. The valve is opened and the line stop plugging head is lowered in place, which cuts off flow in the pipeline.

To verify the effectiveness of the plugging head seal and to test the seal’s efficiency, a bleed-off point must be used. By opening the bleed-off and reducing the pressure on the downstream side of the head, or in the case of double line stops, in between stops, the pipeline pressure is used to help seal the plugging head.

When the work is completed and the line stop must be removed, line pressure is equalized on the "dead" side of the plugging head. This allows the head to be retracted and the line to be put back in service.

To complete the operation, the line stop machines are removed and completion machines are installed onto the temporary valves. A special closure plug is installed into the outlet flange of the line stop fitting, and the line stop machines and temporary valves are removed. Finally, a blind flange is usually installed to finish the line stop operation.

Pipestop-100

Pipestop-100 Operation Specifications:

Operation, using the Pipestop 100, can be repeated at a later date; many pipe and gas companies install line stop fittings instead of valves at points where a valving action will inevitably be required.

Types of line stops
Four types of line stops or pressure plugs get the job done:

Cylindrical plug
A cylindrical plug - made of elastomer or steel - is used to stop the line by sealing against machined surfaces.

Elastomer cup
An elastomer cup seals against the pipe bore. This popular seal is affected by line pressure and is available in the greatest range of pressures and sizes.

Expandable elastomer
An expandable elastomer stopper seals against the bore of the pipe. This type is for low-pressure applications only.

Inflatable gas bag
An inflatable gas bag or balloon seals against the bore of the pipe. This seal is generally independent of line pressure and must be restricted to very low pressures.

Technique
When line stopping, determining the best method is extremely important. There is no universal line stopping technique and the right technique depends on the following variables:

- temperature;
- pressure;
- size of main and wall thickness;
- interior condition of main deposits, corrosion, weld beads, etc.;
- duration of the line stop;
- degree of leakage tolerated; and,
- the flowing medium.

Complete, "bubble tight", shutoff is difficult to achieve. When it is achieved, it is usually the result of good job site techniques. On hazardous jobs, like steam or flammables, the use of special flanges can maintain a safe environment. (Pipe O.D. - (2 x Pipe Wall) = I.D.) This simple formula can be the most important factor in reaching a "bubble tight" shutoff. The pipe I.D. must be verified for every line stop.

Pipestop-100 with Bypass

Ask about our bypass options!

Pipestop100 100 psi.	Item #	Price	ANSI Flange Rating 150
4" PipeStopHead	PSH-0004-100	Call
6" PipeStopHead	PSH-0006-100	Call
8" PipeStopHead	PSH-0008-100	Call
10" PipeStopHead	PSH-0010-100	Call
12" PipeStopHead	PSH-0012-100	Call

4" Linestop Cup	BNLC-03875-0040	Call
6" Linestop Cup	BNLC-05875-0060	Call
8" Linestop Cup	BNLC-07875-0080	Call
10" Linestop Cup	BNLC-09875-0100	Call
10" Linestop Cup	BNLC-09875-0100	Call
4" - 8" LS Housing	PSH-04X3-100	Call	ANSI 150
10" -12" LSHousing	PSH-04X3-100	Call	ANSI 150

4" – 8" Pivot Ball assembly w/Plates	PSB-0150-100	Call	1 ½" I.D
10"–12" Pivot Ball assembly w/Plates	PSB-0200-100	Call	2" I.D
4" – 8" Stainless Short Bar	OSB-150-NB-100	Call
4" – 8" Stainless XL Bar for Bypass	OSB-150-XL-100	Call
10" – 12" Stainless Short Bar	OSB-200-NB-100	Call
10" – 12" Stainless XL Bar for Bypass	OSB-200-XL-100	Call

4" – 8" Crosstop	CTB-150-PS-100	Call
10" – 12" Crosstop	CTB-200-PS-100	Call

4" - 8" Cross Bar	COB-150-PS-100	Call
10" – 12" Cross Bar	COB-150-PS-100	Call
Fig F77-W4B Fabricated Knife Gate Valves - Fabricated Steel -304 stainless gate and liner-Bi-directional resilient seat ½" over size bore 275 psi. cwp / 150Degree (F)		Call
4" - 8" PS Valve 8 1/2" Port	FKG-0850-275	Call	275 psi cwp
10" - 12" PS Valve 12 1/2" Port	FKG-1250-275	Call	275 psi cwp

8" x 4" Valve Adapter	DMF-0408-275	Call	ANSI 150
8" x 6" Valve Adapter	DMF-0608-275	Call	ANSI 150
10" x 12" Valve Adapter	DMF-1012-275	Call	ANSI 150

4" - 8" Completion Plug Holder	CPH-0408-275	Call	T-24 & H-30
10"-12"Completion Plug Holder	CPH-1012-275	Call	T-24 & H-30

Optional Equipment	Item#	Price	ANSI Flange Rating 150
4" PS Valve 4 ½" Port	FKG-0450-275	Call	275 psi
6" PS Valve 6 ½" Port	FKG-0650-275	Call	275 psi
10" PS Valve 10 ½" Port	FKG-1050-275	Call	275 psi
Completion Plug Tool (thread-in) 10" – 12" Adapter	CPT-0408-275 CPA-1012-275	Call	150 psi ANSI 150
4" Tap/Linestop Adapter	PSA-0004-275	Call	275 psi. ANSI 150
6" Tap/Linestop Adapter	PSA-0006-275	Call	275 psi. ANSI 150
8" Tap/Linestop Adapter	PSA-0008-275	Call	275 psi. ANSI 150
10" Tap/Linestop Adapter	PSA-0010-275	Call	275 psi. ANSI 150
12" Tap/Linestop Adapter	PSA-0010-275	Call	275 psi. ANSI 150
4" Housing	PSH-0004-100	Call	ANSI 150
6" Housing	PSH-0006-100	Call	ANSI 150
10" Housing	PSH-0010-100	Call	ANSI 150
Bypass Housings Require XL Actuator bars		Call
4" Housing w/3" Bypass Outlet	PSH-04X3-100	Call	ANSI 150
6" Housing w/ 4" bypass outlet	PSH-06X4-100	Call	ANSI 150
8" Housing w/6" Bypass Outlet	PSH-08X6-100	Call	ANSI 150
10" Housing w/ 8" bypass outlet	PSH-10X8-100	Call	ANSI 150
12" Housing w/10" bypass outlet	PSH-1210-100	Call	ANSI 150

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