Yeongnam Energy14 & 20 December 2025
HOT TAPPING & LINE STOPPING
We cut and connect pipelines without shutting off supply.
JH E&S designs and manufactures its own hot tapping and line stopping equipment, and performs no-shutdown pipeline work at city gas networks and industrial plants across Korea — a capability proven in the field since we localised the technology in 2004.
2004
Founded / Localisation
JH Engineering established
1,978sites
Cumulative Sites
2016–2025 aggregate
15A~1500A
Pipe Size Range
Varies by sector
1~75kg/cm²
Operating Pressure
Chemical plant sector
Business Field
What we do
Four sectors we work in — without shutting supply down
City Gas
Relocation and branching of city gas mains — no-shutdown tapping and stopping from low to medium pressure.
- City gas piping32A ~ 600A
- Petrochemical piping32A ~ 800A
- Petrochemical piping32A ~ 1500A
Chemical Plant
No-shutdown work on in-plant process piping, including tapping and stopping under high pressure.
- Pipe size15A ~ 600A
- MethodHot tapping & line stopping
- Pipe pressure1 ~ 75 kg/cm²
District Heating
Valve tapping and no-shutdown isolation on district heating networks.
- MethodOn line valve Tapping
- MethodBall valve Tapping
- MethodHot tapping & line stopping
Water & Sewage
Large-diameter, no-interruption tapping and stopping on water mains, using either gate or ball valve arrangements.
- With gate valve15A ~ 1500A
- With ball valve15A ~ 1000A
- MethodHot tapping & line stopping
Equipment
Our equipment
Designed, built and supported in Korea
Hot Tapping Machine (Small)
Hot Tapping Machine (Low/Medium Pressure, Compact)
A compact tapping machine for small-diameter branch connections on low and medium pressure city gas mains. It couples directly above the valve, drills the live main and retrieves the coupon.
Details
Line Stopping Machine & By-pass
Line Stopping Machine & By-pass (Low Pressure)
An equipment set that isolates a section of low pressure pipeline without shutdown and, with a by-pass, keeps supply running while the section is worked on.
Details
Hot Tapping Machine
Hot Tapping Machine (Medium Pressure)
For large-diameter branch tapping on medium pressure mains, with a field record up to 400A × 400A branch taps.
Details
Line Stopping Machine & By-pass
Line Stopping Machine & By-pass (Medium Pressure)
For no-shutdown isolation of medium-pressure mains. Field record includes 400A stopping with two 300A by-pass sets running simultaneously.
DetailsProcess
How a no-shutdown job runs
- 01
Site Survey & Review
We verify pipe material, diameter, operating pressure and burial condition, then fix the work method and equipment specification.
- 02
Fitting Welding & Valve Mounting
A split tee or branch fitting is welded onto the live main and a gate or ball valve is mounted.
- 03
Hot Tapping
The tapping machine is coupled above the valve, the live main is drilled and the coupon is retrieved.
- 04
Line Stopping & By-pass
The stopping head isolates the flow and, where required, a by-pass keeps supply running while the isolated section is worked on.
- 05
Plugging & Completion
The stopping head is withdrawn, the branch is permanently plugged and the joint is leak-tested before hand-over.
Track Record
Selected projects
Proven in the field
2016–2025 total
1,978
sites
2025
323
sites
Largest bore executed
400A
MP stopping / branch tap
Max simultaneous points
4
points (2 sets)
Yeongnam Energy10 & 12 December 2025
MP stopping, 400A × 2 points (2 sets, 4 points total)
Yeongnam EnergyOctober 2024
MP branch tap, 400A × 400A × 1 point
Credentials
Registrations & accreditations
- 2023-02-27
Construction Business Registration — Mechanical & Gas Facility Works
JH E&S · Mayor of Namyangju, Gyeonggi-do
- 2022-01-27
Construction Business Registration — Gas Heating Works
JH E&S · Mayor of Namyangju, Gyeonggi-do
- 2010-09-16
Construction Business Registration — Gas Facility Construction, Class 2
JH Engineering · Mayor of Namyangju, Gyeonggi-do
- 2022-02-21
Corporate R&D Department Accreditation
JH E&S · Ministry of Science and ICT · KOITA
- 2021-10-13
Factory Registration Certificate
JH E&S · Korea Industrial Complex Corporation
Patents & Utility Models filed21 patents and 5 utility models in total
Clients & Partners
Clients & partners
LP/MP tapping machines & stopping equipment — delivered to
- CNCITY Energy (Daejeon)
- Haeyang Energy (Gwangju, Jeolla)
- Mokpo City Gas (Jeolla)
- Jeju City Gas
- Jeonnam City Gas (Suncheon)
- GSE (Jinju)
- Busan City Gas
- Kyungnam Energy (Changwon, Gimhae, Geoje, Miryang branches)
- Kyungdong City Gas
- Seorabeol City Gas (Gyeongju)
- Yeongnam Energy (Gumi, Pohang)
- Daesung Energy (Daegu)
MP line stopping & by-pass equipment — delivered to
- Kyungnam Energy HQ (Changwon) — large-bore MP stopping
- GSE HQ (Jinju) — large-bore MP stopping
- Yeongnam Energy Gumi — large-bore MP stopping
- Jeonnam City Gas (Suncheon) — small-bore MP stopping
- Haeyang Energy (Gwangju) — small-bore MP stopping
- Seorabeol City Gas (Gyeongju) — small-bore MP stopping
- ENS System, Hyundai Steel, POSCO and others
MP stopping & by-pass — service contract clients
- Haeyang Energy
- Yeongnam Energy
- Jeonnam City Gas
- Kyungnam Energy
- Jeju City Gas
- GSE
- Chungbuk City Gas
- Wonju City Gas
- Yeongdong City Gas
- Sokcho City Gas
- Seongdo Industry
- Hankuk Corp.
News
Notices
- 2026-01-05
The new JH E&S website is now live
The official JH E&S website is now open. Equipment, project records and certifications are all in one place. For quotations and service enquiries, use the contact page or call 010-3323-6376.
- 2026-01-02
2026 fleet expansion and technical staffing completed
Following the expansion of our divisions, additional tapping and stopping equipment has been acquired and our technical team reinforced. In 2026 we plan to broaden the range of clients we serve under service contracts.
Tell us the bore, the pressure and the location — we will confirm feasibility straight away.
Hot Tapping & Line Stopping Equipment Manufacturing & No-Shutdown Pipeline Services