Line Stop and Hot Tap Fittings: Threaded, SStop and LockSure, 1″ to 56″
Line stop and hot tap fittings are specialized components used to safely access and isolate pressurized pipelines without interrupting flow.
Hot tap fittings enable the creation of a controlled entry point into the pipeline, allowing for tie-ins, maintenance, or bypass installations. Line stop fittings work in tandem to temporarily block flow downstream of the tap, facilitating repairs, replacements, or modifications while the system remains live. Together, these fittings support critical operations in the gas, oil, petrochemical and water industries, ensuring minimal downtime and maximum safety during intervention.
Models & Specifications
General Specifications: Propipe Hot Tap and Line Stop Fittings
Hot tap and line stop fittings are designed as pressure vessels and are welded to pipelines where an on-charge intervention is needed. Hot tap equipment is connected to these fittings to perform hot tap or line stop operations. They are used for connecting a new branch, relocating existing pipe, or changing or inserting in-line valves, without shutting down the pipe’s service.
| Construction | Carbon steel or stainless steel |
|---|---|
| Fitting Types | Extruded, welded and mechanical fittings |
| Size Range | 1″ to 56″, depending on fitting type |
| Pressure Classes | 150#, 300#, 600# and 900#, depending on fitting type |
| Design Code | ASME B31.3 / B31.4 / B31.8 |
| Design Pressure | The maximum for each rating |
| Design Factor | 0.72 / 0.4 |
| Design Temperature | −4°F to 176°F (−20°C to 80°C) |
| Corrosion Allowance | As per project requirements |
| Flanges | ASTM A105; ASME B16.5 up to 24″; MSS-SP-44 / ASME B16.47 Series A above 24″ |
| Bolts and Nuts | ASTM A193 B7 / A194 2H |
| Pipe | API 5L Gr. B, ASTM A106 Gr. B, E355 (EN 10028-3) |
| NDT (ASME Section V) | 100% radiographic testing on butt welds; 100% ultrasonic testing on other welds |
| Welding | ASME Section IX, API 1104 |
| Certification | EN 10204 Type 3.1 |
| Compatibility | Compatible with equipment from most major brands |
Propipe designs its fittings for the gas, oil, petrochemical and water industries, following international regulations and each client’s specific requirements.
Threaded Line Stop Fittings
Threaded line stop fittings for small-diameter hot tap and line stop work.
| Design Pressure Range | Up to 870 psi (60 bar) |
|---|---|
| Pressure Classes | — |
| Size Range | 1″ to 3″ |
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 2″, 3″ | PF-0202-15-TT-AR to PF-0303-15-TT-AR |
| 300# | 2″, 3″ | PF-0202-30-TT-AR to PF-0303-30-TT-AR |
| 600# | 2″, 3″ | PF-0202-60-TT-AR to PF-0303-60-TT-AR |
Dimensions and weights for each part number are on the line stop fittings data sheet (PDF). Figures on the data sheet are indicative and may vary.
SStop Line Stop Fittings
SStop line stop distribution fittings.
| Design Pressure Range | Up to 508 psi (35 bar) |
|---|---|
| Pressure Classes | 150# and 300# |
| Size Range | 4″ to 12″ |
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 4″, 6″, 8″, 10″, 12″ | PF-0404-15-SN-AR to PF-1212-15-SN-AR |
| 300# | 4″, 6″, 8″, 10″, 12″ | PF-0404-30-SN-AR to PF-1212-30-SN-AR |
Dimensions and weights for each part number are on the line stop fittings data sheet (PDF). Figures on the data sheet are indicative and may vary.
LockSure Line Stop Fittings
LockSure line stop fittings for larger diameters and higher pressure classes.
| Design Pressure Range | Up to 1,450 psi (100 bar) |
|---|---|
| Pressure Classes | 150#, 300#, 600# and 900# |
| Size Range | 4″ to 56″ |
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, 26″, 28″, 30″, 34″, 36″ | PF-0404-15-LN-AR to PF-3636-15-LN-AR |
| 300# | 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, 26″, 28″, 30″, 34″, 36″ | PF-0404-30-LN-AR to PF-3636-30-LN-AR |
| 600# | 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, 26″, 28″, 30″, 34″, 36″ | PF-0404-60-LN-AR to PF-3636-60-LN-AR |
Dimensions and weights for each part number are on the line stop fittings data sheet (PDF). Figures on the data sheet are indicative and may vary.
Three Way Tee Fittings
Three way tees are available in threaded, SStop distribution and LockSure versions. The data sheet shows a 48″ × 56″ LockSure flanged three way tee with full circle reinforcement, including an LS plug, compatible with most major brands of machines.
| Type | Design Pressure Range | Pressure Classes | Size Range |
|---|---|---|---|
| Threaded | Up to 870 psi (60 bar) | — | 1″ to 3″ |
| SStop Distribution | Up to 508 psi (35 bar) | 150# and 300# | 4″ to 12″ |
| LockSure | Up to 1,450 psi (100 bar) | 150#, 300#, 600# and 900# | 4″ to 56″ |
Threaded three way tees
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 2″, 3″ | PF-0202-15-TT-TR to PF-0303-15-TT-TR |
| 300# | 2″, 3″ | PF-0202-30-TT-TR to PF-0303-30-TT-TR |
| 600# | 2″, 3″ | PF-0202-60-TT-TR to PF-0303-60-TT-TR |
SStop three way tees
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 4″, 6″, 8″, 10″, 12″ | PF-0404-15-SN-TR to PF-1212-15-SN-TR |
| 300# | 4″, 6″, 8″, 10″, 12″ | PF-0404-30-SN-TR to PF-1212-30-SN-TR |
Dimensions and weights for each part number are on the three way tee data sheet (PDF). Figures on the data sheet are indicative and may vary.
Spherical Fittings
Spherical three way tees are available in threaded, SStop distribution and LockSure versions.
| Type | Design Pressure Range | Pressure Classes | Size Range |
|---|---|---|---|
| Spherical Threaded | Up to 870 psi (60 bar) | — | 1″ to 3″ |
| Spherical SStop Distribution | Up to 508 psi (35 bar) | 150# and 300# | 4″ to 12″ |
| Spherical LockSure | Up to 1,450 psi (100 bar) | 150#, 300#, 600# and 900# | 4″ to 20″ |
Threaded spherical three way tees
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 2″, 3″ | PF-0202-15-TT-SF to PF-0303-15-TT-SF |
| 300# | 2″, 3″ | PF-0202-30-TT-SF to PF-0303-30-TT-SF |
| 600# | 2″, 3″ | PF-0202-60-TT-SF to PF-0303-60-TT-SF |
SStop spherical three way tees
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 4″, 6″, 8″, 10″, 12″ | PF-0404-15-SN-SF to PF-1212-15-SN-SF |
LockSure spherical three way tees
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 300# | 4″, 6″, 8″, 10″, 12″ | PF-0404-30-LN-SF to PF-1212-30-LN-SF |
| 600# | 4″, 6″, 8″, 10″, 12″ | PF-0404-60-LN-SF to PF-1212-60-LN-SF |
Dimensions and weights for each part number are on the spherical fittings data sheet (PDF). Figures on the data sheet are indicative and may vary.
Conduit Barrel Fittings
Conduit barrel LockSure three way tees.
| Design Pressure Range | Up to 1,450 psi (100 bar) |
|---|---|
| Pressure Classes | 150#, 300#, 600# and 900# |
| Size Range | 4″ to 52″ |
Split Tee Fittings
Split tees are supplied as extruded or fabricated fittings.
| Extruded Split Tees | ASTM A234 WPB, WPHY 60 or WPHY 70 |
|---|---|
| Fabricated Split Tees | Plate P355 NL1 or P460 NL1 (EN 10028-3), or A537 CL1 |
SStop and LockSure Flanges
SStop distribution flanges include the SStop plug. LockSure flanges include the LS plug.
| Type | Design Pressure Range | Pressure Classes | Size Range |
|---|---|---|---|
| SStop Distribution Flanges (with SStop plug) | Up to 508 psi (35 bar) | 150# and 300# | 4″ to 12″ |
| LockSure Flanges (with LS plug) | Up to 1,450 psi (100 bar) | 150#, 300#, 600# and 900# | 4″ to 56″ |
SStop flanges
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 4″, 6″, 8″, 10″, 12″ | PF-04-15-SN to PF-12-15-SN |
| 300# | 4″, 6″, 8″, 10″, 12″ | PF-04-30-SN to PF-12-30-SN |
LockSure flanges
| Class | Sizes on Data Sheet | Part Numbers |
|---|---|---|
| 150# | 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, 26″, 28″, 30″, 32″, 34″, 36″ | PF-04-15-LN to PF-36-15-LN |
| 300# | 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, 26″, 28″, 30″, 32″, 34″, 36″ | PF-04-30-LN to PF-36-30-LN |
| 600# | 4″, 6″, 8″, 10″, 12″, 14″, 16″, 18″, 20″, 22″, 24″, 26″, 28″, 30″, 32″, 34″, 36″ | PF-04-60-LN to PF-36-60-LN |
Dimensions and weights for each part number are on the SStop and LockSure flanges data sheet (PDF). Figures on the data sheet are indicative and may vary.
Frequently Asked Questions
Fitting Basics
What is a line stop fitting?
A line stop fitting is a pressure vessel welded to a live pipeline. Hot tap and line stop equipment is connected to it so the line can be tapped and flow blocked during an on-charge intervention, without shutting down the pipe’s service.
What are hot tap and line stop fittings used for?
Connecting a new branch, relocating existing pipe, or changing or inserting in-line valves, all without shutting down the pipe’s service.
What else is needed for a line stop?
Besides the fitting, a line stop uses a slim (sandwich) valve, a hot tap machine to cut the opening, and a line stop actuator with a line stop head to block flow.
Types, Sizes and Pressure
Which fittings does Enerteq supply?
Propipe threaded, SStop and LockSure line stop fittings; threaded, SStop and LockSure three way tees; spherical fittings; conduit barrel fittings; split tees; and SStop and LockSure flanges.
What is the difference between SStop and LockSure fittings?
SStop distribution fittings have a design pressure range up to 508 psi (35 bar) in Classes 150# and 300#, from 4″ to 12″. LockSure fittings have a design pressure range up to 1,450 psi (100 bar) in Classes 150#, 300#, 600# and 900#, from 4″ to 56″.
What sizes are available?
From 1″ to 56″ depending on type: threaded fittings 1″ to 3″, SStop fittings 4″ to 12″, LockSure fittings 4″ to 56″, spherical LockSure three way tees 4″ to 20″, and conduit barrel LockSure three way tees 4″ to 52″.
What is the pressure rating of a threaded line stop fitting?
Threaded line stop fittings and threaded three way tees have a design pressure range up to 870 psi (60 bar), from 1″ to 3″.
Design, Materials and Testing
What design codes are the fittings built to?
ASME B31.3, B31.4 and B31.8, with a design factor of 0.72 / 0.4 and a design temperature of −4°F to 176°F (−20°C to 80°C).
Are fittings available in carbon steel and stainless steel?
Yes. Fittings are supplied in carbon steel or stainless steel, as extruded, welded or mechanical fittings.
How are the fittings tested and certified?
Butt welds receive 100% radiographic testing and other welds 100% ultrasonic testing, per ASME Section V. Welding follows ASME Section IX and API 1104, and materials come with EN 10204 Type 3.1 certification.
Compatibility
Are the fittings compatible with other brands of equipment?
Yes. The fittings are compatible with equipment from most major brands.
Do SStop and LockSure flanges include a plug?
Yes. SStop distribution flanges include the SStop plug, and LockSure flanges include the LS plug.
Custom Fittings for Demanding Field Conditions
Enerteq delivers precision-engineered fittings tailored to your pipeline specs, pressure ratings, and operational constraints. Whether you’re working with non-standard pipe geometries, legacy interfaces, or extreme environments, our team adapts split tees, flanges, and intervention fittings to meet your exact requirements.
We support custom fabrication and modification across:
- Split tee profiles for irregular pipe diameters and wall thicknesses
- Flange configurations for non-standard bolt patterns and pressure classes
- Mounting interfaces compatible with legacy tapping and stopping equipment
From hot tap to line stop fittings, Enerteq ensures every component is built for performance, safety, and field reliability.
Contact us to specify your project parameters—we’ll deliver fittings that match your technical standards and site realities.
Need installation tools but not sure of compatibility? Try ESI’s Flange Master Tool or the EZ Calc torque calculator. For flange alignment on fitting installations, see ESI’s flange alignment tools.
