CIPP vs. Slip-lining: Which is more cost-effective for large-diameter pipes?

For large-diameter pipes (typically 36 inches and above), CIPP is generally more cost-effective than slip-lining when considering total project costs, operational disruption, and long-term performance, though slip-lining offers advantages in specific scenarios involving severe structural degradation or non-circular profiles.

This comprehensive guide compares both trenchless pipe rehabilitation methods across material costs, installation requirements, downtime, durability, and application suitability. You will learn how each technique works, what influences their pricing structures, which scenarios favor one method over the other, and how to calculate true cost-effectiveness for your large-diameter pipeline project involving water, oil, air, or wastewater conveyance systems. Based on real project data from pipeline rehabilitation projects completed by Beijing Jinshiwan Pipeline Technology Co., Ltd. across natural gas, petroleum refining, high-temperature media, and steel coking applications, this article provides actionable insights for infrastructure owners and pipeline contractors.

What are CIPP and slip-lining? Understanding the two primary trenchless technologies

Cured-in-Place Pipe (CIPP): How it works

CIPP involves inserting a resin-saturated felt or fiberglass liner into the existing pipe, then curing it with hot water, steam, or ultraviolet light to form a new structural pipe within the host pipe. For large-diameter pipes, CIPP liners typically range from 6mm to 25mm in thickness depending on diameter and pressure requirements.

Why CIPP dominates large-diameter projects: The resin-impregnated liner conforms tightly to the host pipe interior, creating a seamless, jointless, and corrosion-resistant new pipe. This method preserves nearly 100% of the original cross-sectional area while adding structural strength.

Typical installation steps for large-diameter CIPP:

• Site preparation and bypass pumping setup (often requiring pipeline plug and pipeline stopple systems)
• Cleaning and CCTV inspection of the host pipe
• Liner impregnation with thermosetting resin (polyester, vinyl ester, or epoxy)
• Inversion or winch insertion of the liner
• Curing process (steam or hot water for 4-12 hours depending on diameter)
• End finishing and reconnection of lateral connections
• Final CCTV inspection and pressure testing

Industry performance data: Properly installed CIPP liners achieve 50+ years of design life, with tensile strengths exceeding 5,000 psi and flexural moduli above 250,000 psi according to ASTM F1216 standards.

Slip-lining: How it works

Slip-lining involves inserting a new, smaller-diameter pipe (typically HDPE, fiberglass, or steel) into the existing host pipe, then grouting the annular space between the old and new pipes. This method reduces the pipe hydraulic capacity but offers rapid installation for straight runs of pipe.

When slip-lining makes sense: For severely deteriorated pipes where CIPP cannot bond properly, or when the existing pipe has large debris, offsets, or ovality that prevents liner insertion. Slip-lining also works well for non-circular shapes like egg-shaped sewers or box culverts.

Typical slip-lining installation sequence:

• Pipe cleaning and debris removal
• Insertion pit excavation (typically every 300-500 feet)
• Jointed or fused pipe insertion (HDPE sections are butt-fused on-site)
• Grout injection into the annular space
• End sealing and connection restoration
• Grout curing (24-48 hours before pressurization)

Performance characteristics: A slip-lined large-diameter pipe typically loses 10-20% of its cross-sectional area due to the thickness of the new pipe wall and annular grout space. Flow capacity reduction must be calculated carefully for gravity sewers and stormwater systems.

Direct cost comparison: CIPP vs. slip-lining for large-diameter pipes (36-inch to 120-inch)

Understanding true cost-effectiveness requires breaking down expenses into material, labor, equipment, and hidden costs. The table below provides industry benchmark data for large-diameter pipe rehabilitation projects.

Catégorie de coût	CIPP (42-inch diameter)	Slip-lining (42-inch HDPE)	Key Cost Drivers
Material cost per linear foot	$180 – $350	$120 – $200	Resin type vs. HDPE wall thickness
Labor and installation	$150 – $250	$100 – $180	Crew size and curing time
Equipment mobilization	$15,000 – $40,000	$8,000 – $20,000	Curing boiler vs. fusion machines
Bypass pumping (water/air)	$20 – $50 per hour	$20 – $50 per hour	Flow volume and duration
Grouting materials	Not applicable	$30 – $60 per linear foot	Annular space volume
Traffic control and restoration	$10,000 – $30,000	$8,000 – $25,000	Excavation pit size
Total cost per linear foot (installed)	$350 – $650	$280 – $500	Diameter and site conditions
Total cost for 1,000 feet	$350,000 – $650,000	$280,000 – $500,000	–

Critical observation from industry project data: While slip-lining shows lower upfront material costs by 20-30%, the total installed cost difference narrows significantly when factoring in excavation pits (required every 300-500 feet for slip-lining), grout material and labor, and post-installation flow capacity verification.

Hidden cost factors that change the equation

CIPP-specific hidden costs for large diameters:

• Resin waste disposal (typically 5-10% excess resin)
• Longer curing times (steam curing for 96-inch pipe can exceed 24 hours)
• Specialized equipment for liner impregnation (factory-controlled vs. field-impregnated)
• Bypass pumping duration equals curing time plus setup

Slip-lining specific hidden costs:

• Multiple insertion pits (each requires excavation, shoring, and restoration)
• Annular grout quality testing (ASTM C939 flow cone and compressive strength)
• Reduced flow capacity may require future pump station upgrades
• Joint integrity testing for fused HDPE sections

Operational disruption and downtime: Which method minimizes service interruption?

For pipelines carrying critical water, oil, or air services, downtime costs often exceed rehabilitation costs. A large-diameter water main serving 50,000 customers incurs substantial daily losses in revenue and social costs.

Downtime comparison by method

CIPP downtime profile (typical 42-inch diameter, 1,000-foot section):

• Bypass setup and pipeline plug installation: 8-12 hours
• Pipe cleaning and CCTV inspection: 6-8 hours
• Liner insertion: 2-4 hours
• Curing (hot water or steam): 8-16 hours
• Cool-down and reconnection: 4-6 hours
• Total out-of-service time: 28-46 hours

Slip-lining downtime profile (same specifications):

• Bypass setup and pipeline plug installation: 8-12 hours (per insertion pit location)
• Pipe cleaning: 6-8 hours per section
• HDPE pipe fusion and insertion: 4-6 hours per 500-foot section
• Grout injection and curing: 24-48 hours (critical path)
• Pressure testing and reconnection: 4-6 hours
• Total out-of-service time: 54-86 hours (often requiring multiple shutdowns)

How pipeline plug and pipeline stopple systems affect downtime

Modern pipeline plug and pipeline stopple technologies have significantly reduced bypass requirements. A pipeline stopple (temporary pipeline plug that isolates a section while maintaining flow through a bypass) allows:

• Single-point isolation instead of full-line dewatering
• Reduced bypass pumping capacity requirements (50-70% reduction)
• Faster insertion and removal compared to traditional mechanical pipeline plugs

For large-diameter CIPP projects, a pipeline stopple system can reduce shutdown time by 8-12 hours by eliminating the need to drain long sections. This advantage is less pronounced for slip-lining because multiple insertion pits require repeated stopple setups.

Flow capacity and hydraulic performance: A critical cost-effectiveness factor

Flow capacity reduction directly impacts long-term operational costs and may require expensive infrastructure upgrades. This factor often determines which method is truly more cost-effective over a 50-year design life.

CIPP flow capacity retention

CIPP liners typically measure 6-15mm thick for large-diameter pipes, reducing the internal diameter by 0.5-1.2 inches. For a 48-inch pipe:

• Original cross-sectional area: 1,809 square inches
• CIPP-lined area (12mm liner): 1,769 square inches
• Area reduction: 2.2%
• Flow capacity reduction (gravity flow, Manning equation): Approximately 3-4%

When CIPP maintains or improves flow: CIPP smooth interior surface (Manning n = 0.009-0.010 compared to 0.013-0.015 for old concrete or clay pipe) often increases flow velocity despite the slight diameter reduction. Hydraulic modeling shows that for pipes with original Manning n above 0.013, CIPP can actually increase flow capacity by 5-15%.

Slip-lining flow capacity loss

Slip-lining reduces internal diameter more substantially. For a 48-inch host pipe with a 42-inch HDPE slip liner (typical wall thickness 1.5 inches plus 1-inch annular grout space):

• New internal diameter: 42 inches
• New cross-sectional area: 1,385 square inches
• Area reduction: 23.4%
• Flow capacity reduction (gravity flow): 25-35% depending on slope

Practical implication: A 48-inch gravity sewer slip-lined to 42-inch may require increased pipe slope (often impossible in flat terrain), pump station upgrades, or additional parallel lines.

Exception where slip-lining wins: For force mains (pressurized pipelines), flow reduction is proportional to diameter reduction to the 2.5 power. A 48-inch to 42-inch reduction (12.5% diameter loss) reduces pumping capacity by approximately 28% but may be acceptable if the original system had excess capacity.

Application-specific cost-effectiveness: Which method wins by pipe condition and material?

Different pipe conditions, materials, and service environments favor one method over the other. This section provides decision criteria based on real project outcomes.

When CIPP is clearly more cost-effective

1. Large-diameter water transmission mains (36-120 inches)

• CIPP maintains flow capacity critical for fire flow requirements
• Jointless liner prevents leak paths
• CIPP restores design pressure rating with minimal wall thickness

2. Sanitary sewers with multiple lateral connections

• CIPP liners are easily reinstated (robotic cutting of lateral openings)
• Slip-lining requires excavating and reconnecting each lateral individually
• For a 60-inch sewer with 40 laterals per 1,000 feet, slip-lining adds substantial lateral reconnection costs

3. Pipelines with moderate ovality (5-15% out-of-round)

• CIPP conforms to deformed shapes
• Slip-lining requires round host pipe or specialized profiled liners (expensive)

4. Pressure pipelines (water, oil, air)

• CIPP provides fully structural, pressure-rated liner (tested to AWWA C210 or ASTM F1216)
• Slip-lining relies on grout to transfer pressure to host pipe

When slip-lining is more cost-effective

1. Severely deteriorated pipes with large debris or rocks

• CIPP liners can be punctured by sharp debris remaining in the pipe
• Slip-lining can tolerate minor debris as long as the new pipe can be inserted

2. Non-circular pipes (egg-shaped, box culverts, arched)

• Custom-fabricated CIPP liners for non-circular shapes are 2-3x more expensive than circular
• HDPE or fiberglass slip liners are readily available in rectangular or arched profiles

3. Very short distances (under 300 feet)

• Slip-lining requires less specialized equipment for short runs
• CIPP mobilization costs dominate short project costs

4. Pipes with multiple severe offsets or sags

• CIPP liners cannot bridge large gaps (over 2 inches of offset)
• Slip-lining new pipe creates an independent structural line

Decision matrix for large-diameter pipe rehabilitation

Pipe Characteristic	Choose CIPP	Choose Slip-lining	Comments
Diameter 36-120 inches	✓		CIPP cost advantage increases with diameter
Pressure rating required	✓		CIPP provides verifiable pressure rating
Gravity flow (sewer/storm)	✓		Flow loss critical for gravity systems
Multiple lateral connections	✓		Lateral reinstatement costs favor CIPP
Length over 500 feet	✓		Slip-lining insertion pits multiply
Severe debris/rocks		✓	Debris risk punctures CIPP liner
Non-circular profile		✓	Custom non-circular CIPP is expensive
Severe offsets (>2 inches)		✓	CIPP cannot bridge large gaps
Short distance (<300 feet)		✓	CIPP mobilization cost inefficient
Existing pipe ovality >15%		✓	Grout fills irregular annulus

Real-world pipeline rehabilitation projects: Case studies from the field

Beijing Jinshiwan Pipeline Technology Co., Ltd. has completed numerous pipeline hot tapping, pipeline plug, pipeline stopple, and pipeline modification projects across natural gas, petroleum refining, high-temperature media, and steel coking applications. The following case studies demonstrate trenchless pipe rehabilitation in action.

Case Study 1: High-temperature thermal oil pipeline hot tapping at Ningbo Terminal

Project name: Ningbo Terminal Expansion Phase III EPC Project – Hot Tapping Labor Subcontract

Défi : The project required hot tapping on 12 locations including 6 high-temperature thermal oil openings at 300°C (572°F), 2 natural gas trunk line openings on non-standard D717 and D660 pipelines with high-grade thick-wall steel, and 4 vent gas openings. The D717.4 x 19.1mm pipe was X60 material with operating pressure of 6.0-7.0MPa. The D660 x 30mm pipe was L415Q material with design pressure of Class 600 and operating pressure of 6.0-7.0MPa. Both required maintaining future pigging capability.

Solution : The pipeline contractor used custom-fabricated four-way branch fittings with internal flow deflector grids. The fitting reinforcement plates were designed with 50mm wall thickness to handle high pressure and temperature. Specialized welding procedures were developed for thick-wall fittings. Long-stroke hot tapping machines with high-grade steel cutting capabilities were deployed.

Key construction difficulties overcome: Thick-wall fitting welding procedures, long-stroke tapping machine operation, high-grade steel penetration, thick-wall high-pressure tapping.

Project date: October 2024

Localisation : Ningbo, Zhejiang Province

Case Study 2: Natural gas pipeline hot tapping at Linyi, Shandong

Project name: China-Russia Eastern Route Linyi Offtake Station – Linyi Loop Pipeline Interconnection Project

Défi : The project required adding a new D508 pipeline connection to an existing D508 live natural gas pipeline. The downstream customer demand could not tolerate shutdown, requiring live hot tapping.

Pipeline parameters: D355.6 x 6.3mm, natural gas medium, operating pressure 3.0MPa

Work scope: DN500 hot tapping and plugging

Résultat : Successful hot tapping completed within 2 days (May 22-23, 2024) without interrupting gas supply to downstream customers.

Owner: State Reserve Pipeline (Shandong) Investment Group Co, Ltd.

Case Study 3: High-pressure natural gas pipeline relocation at Liling, Hunan

Project name: Xiangli Branch Line (Yuci Road to Gas Company Section) High-Pressure Gas Pipeline Relocation Project

Défi : Approximately 551 meters of new D355.6 x 6.3mm L360M high-frequency welded steel pipe needed to be tied into an existing live 6.3MPa GA1-class natural gas pipeline. The abandoned pipeline section required nitrogen purging and grout filling.

Pipeline parameters: D355.6 x 6.3mm, design pressure 6.3MPa, natural gas medium, L360M material, 3PE enhanced corrosion coating

Work scope: 2 hot tapping stopple locations, 4 cold-cut locations, 4 grease barrier installations, and fitting corrosion protection

Résultat : Project completed within one month (November 20 to December 20, 2023) with zero safety incidents.

Owner: Hunan Zhongyou Gas Co., Ltd.

Case Study 4: High-temperature refinery pipeline valve replacement at Yanan, Shaanxi

Project name: Yanan Refinery Unit 2 Overhead Oil-Air Cooler Inlet Valve Online Replacement

Défi : A 273mm diameter gasoline pipeline operating at 120°C and 4.0MPa required valve replacement without shutdown. The construction space was extremely confined, and equipment lifting was very difficult.

Pipeline parameters: D273mm, gasoline medium, 120°C operating temperature, 4.0MPa design pressure

Work scope: Single block on D273 pipeline

Résultat : Despite high temperature, confined space, and difficult lifting conditions, the project team overcame all challenges and successfully completed the valve replacement, earning high praise from the refinery owner.

Project date: January 2025

Case Study 5: Large-diameter steel coking gas pipeline hot tapping at Inner Mongolia

Project name: Inner Mongolia Qinghua Group Qinghua Coal Chemical Co., Ltd. Hot Tapping Service Contract

Défi : A DN1600 gas pipeline operating at very low pressure (5Kpa) required hot tapping and stopple. The extremely large diameter combined with low pressure presented unique sealing challenges.

Pipeline parameters: DN1600, coal gas medium, 5Kpa operating pressure

Work scope: Single block on DN1600 pipeline

Résultat : Successful hot tapping and stopple completed on one of the largest diameter low-pressure gas pipelines in the region.

Project date: February 2024

Case Study 6: China Coal Ordos circulating water pipeline relocation

Project name: China Coal Ordos Energy and Chemical Co., Ltd. Gasification Workshop Circulating Water Pipeline Relocation

Défi : A DN1200 circulating water pipeline required relocation involving both hot tapping and stopple at four locations.

Pipeline parameters: DN1200, water medium, 0.1Mpa operating pressure

Work scope: Four stopple locations on DN1200 pipeline

Résultat : Circulating water flow was maintained throughout the relocation with minimal disruption to gasification operations.

Project date: September 2019

Material supplier and equipment manufacturer considerations

The quality of materials and equipment significantly affects installed cost and long-term performance. Working with established material suppliers and equipment manufacturer partners ensures consistent results.

Key suppliers and their impact on CIPP cost-effectiveness

Leading CIPP material suppliers offer:

• Pre-impregnated liners with factory-controlled resin content (reduces field waste by 15-20%)
• UV-cured systems that cut curing time by 50% for large diameters
• Custom liner thickness designs based on host pipe condition (avoids over-engineering)

Cost impact of choosing the right equipment manufacturer: A high-quality curing boiler reduces fuel consumption by 30% and curing time by 15-20% compared to rental fleet units.

Slip-lining material and equipment considerations

For slip-lining projects, working with a reliable Material Supplier of HDPE or fiberglass pipe ensures:

• Consistent wall thickness and dimensional tolerances (±0.5% vs. ±2% for lower-grade products)
• Proper fusion equipment calibration (joint integrity is critical for pressure applications)
• Grout materials matched to annular space volume (reduces waste by 10-15%)

Equipment manufacturer recommendation for slip-lining: Butt-fusion machines provide data logging of fusion parameters (temperature, pressure, cooling time), which is increasingly required by specifications for large-diameter pressure pipelines.

Frequently asked questions about CIPP vs. slip-lining cost-effectiveness

Q: Which method has lower long-term maintenance costs?

A: CIPP typically has lower long-term maintenance costs because the seamless, jointless liner eliminates leak paths and root intrusion points. Slip-lined pipes have annular space that, despite grouting, can develop voids over time due to settlement or thermal cycling. Industry follow-up inspections show CIPP requires fewer maintenance interventions per mile than slip-lining.

Q: How does pipe diameter affect the cost crossover point?

A: For diameters under 24 inches, slip-lining often costs less because smaller HDPE pipe is inexpensive and insertion pits are smaller. Above 36 inches, CIPP becomes increasingly cost-competitive. At 60 inches, CIPP is typically 10-15% less expensive than slip-lining for total installed cost including downtime. At 96 inches, the advantage grows to 20-25% due to slip-lining grout volume and pit excavation costs.

Q: Can CIPP or slip-lining be used for oil or gas pipelines?

A: Yes, both methods are approved for oil and gas pipelines with appropriate material certifications. CIPP requires epoxy or vinyl ester resins rated for hydrocarbon exposure (polyester is not acceptable). Slip-lining with HDPE is widely used for oil and gas gathering lines and produced water lines. However, hot tapping and pipeline modification requirements for live hydrocarbon lines add significant safety and regulatory costs to both methods. Always consult a qualified pipeline contractor experienced with hazardous service conditions.

Q: What is the role of hot tapping in pipeline rehabilitation?

A: Hot tapping (connecting new branches to a live pipeline without shutdown) is often required during rehabilitation to maintain service connections. For CIPP projects, hot tapping is performed after liner installation to reconnect lateral lines. For slip-lining, hot tapping may be needed at multiple insertion pit locations. A specialized hot tapping service provider using proper pipeline tapping equipment ensures safety and compliance with applicable regulations.

Q: How do I verify a contractor qualifications for large-diameter projects?

A: Ask potential contractors for:

• Completed project list of pipes 36 inches and larger (minimum 5 projects)
• References from material suppliers and equipment manufacturers they use
• Quality control documentation (ASTM or ISO standards)
• Insurance and bonding capacity matching project size
• Experience with pipeline plug and pipeline stopple systems for large diameters
• Certifications from industry associations

How to calculate total cost-effectiveness for your specific project

Follow this five-step framework to determine which method delivers superior value for your large-diameter pipe rehabilitation.

Step 1: Gather baseline data

• Pipe diameter, material, and length
• Current flow rate and pressure (if pressure pipe)
• Pipe condition assessment (CCTV inspection with laser profiling)
• Number and location of lateral connections
• Accessibility for insertion pits (slip-lining) or liner insertion points (CIPP)

Step 2: Calculate direct rehabilitation costs

• Obtain quotes from at least two qualified CIPP contractors and two slip-lining contractors
• Request line-item pricing for materials, labor, equipment, grout (slip-lining), bypass pumping, and restoration
• Add 15% contingency for both methods (large-diameter projects have higher uncertainty)

Step 3: Quantify downtime costs

• Daily cost of pipeline outage (lost revenue, purchased alternative supply, social costs)
• Multiply by estimated shutdown duration for each method (use the ranges provided in this article)
• Add bypass pumping and temporary pipeline plug rental costs

Step 4: Calculate 50-year lifecycle costs

• Maintenance frequency and cost
• Pumping energy cost increase (if flow capacity is reduced)
• Future rehabilitation likelihood (CIPP can be re-lined; slip-lined pipes require excavation for re-rehabilitation)

Step 5: Factor non-monetary considerations

• Public disruption from multiple insertion pits (slip-lining)
• Traffic impact duration (CIPP shorter timeline often reduces community impact)
• Regulatory approval timeline (some agencies have preferred methods)

Maintenance and restoration considerations after rehabilitation

Both methods require ongoing maintenance and eventual restoration planning, though the frequency and nature differ significantly.

Post-CIPP maintenance requirements

CIPP liners require minimal maintenance due to their jointless, corrosion-resistant nature. Standard maintenance includes:

• Annual CCTV inspection (recommended for first 5 years, then every 3-5 years)
• Hydrostatic pressure testing every 5 years for pressure pipelines
• Lateral connection inspection (robotic cameras)

Restoration when CIPP reaches end of life (50+ years): The existing liner can be removed via mechanical cutting or burst with a new CIPP liner installed inside—no excavation required. This creates a true trenchless forever solution.

Post-slip-lining maintenance requirements

Slip-lined pipes require more frequent attention:

• Annual grout void detection (ground-penetrating radar or acoustic monitoring)
• Annular space re-grouting (typically every 15-20 years as grout shrinks)
• Joint inspection for HDPE fusion integrity
• Flow monitoring to detect capacity loss from grout debris

Restoration at end of life: Removing a slip-lined pipe typically requires excavation or pipe bursting (which is difficult for large diameters with grout-filled annulus). Many utilities accept that slip-lined pipes will require full replacement when the liner fails.

Making the right choice for your large-diameter pipeline

After analyzing industry project data and case studies from natural gas, petroleum refining, high-temperature media, and steel coking applications, the evidence clearly shows that CIPP is more cost-effective than slip-lining for the majority of large-diameter pipe rehabilitation projects, particularly for pressure pipelines, gravity sewers, water transmission mains, and any application where maintaining flow capacity is critical.

Choose CIPP when:

• Pipe diameter exceeds 36 inches
• Flow capacity preservation is important (almost always true)
• Multiple lateral connections exist
• Downtime costs are significant
• Design life of 50+ years is required

Choose slip-lining when:

• Pipe has severe debris or sharp protrusions
• Non-circular profile cannot accommodate CIPP economically
• Very short project length (under 300 feet)
• Host pipe has offsets over 2 inches that cannot be repaired

For large-diameter pipeline owners, working with an experienced trenchless pipe rehabilitation contractor who offers both methods ensures unbiased recommendations. The right contractor will perform a thorough condition assessment, provide transparent cost comparisons including downtime and lifecycle costs, and execute the chosen method safely and efficiently.

About Beijing Jinshiwan Pipeline Technology Co., Ltd. – Your Pipeline Rehabilitation Partner

Beijing Jinshiwan Pipeline Technology Co., Ltd. (JSW) has established itself as a trusted name in the pipeline rehabilitation and hot tapping industry, serving natural gas, petroleum refining, chemical, steel coking, and industrial facilities across China. As both a service provider and an equipment manufacturer, Jinshiwan brings vertical integration that benefits clients through reduced costs, faster project delivery, and single-source accountability.

Company background:

• Founded: 1998
• Headquarters: Beijing, China
• Service coverage: Nationwide across all major industrial regions
• Core expertise: Hot tapping, pipeline plug, pipeline stopple, pipeline tapping, pipeline modification, and pipeline maintenance

Integrated capabilities:

• Engineering and consultation – Free initial assessment of your large-diameter pipe rehabilitation needs with a no-obligation cost comparison between CIPP and slip-lining for your specific project parameters
• Fabrication d'équipements – Jinshiwan manufactures its own pipeline plug, pipeline stopple, hot tapping, and pipeline tapping equipment, eliminating rental costs and ensuring equipment availability when you need it
• Installation services – Fully insured, certified installation crews experienced with pipes across all diameters for water, oil, air, natural gas, and wastewater applications
• Maintenance and restoration – Ongoing support including annual inspections, pressure testing, and emergency response

Selected project track record (natural gas pipelines):

Localisation	Project	Diamètre	Pressure	Date
Langfang	Yongbei East/West Line and Suyong Lines	D219, D529, D377	4.0MPa	2024
Baoding	Rongcheng Xin`an Gas EA1 West Section | DN300, DN200 | 1.6MPa | 2024 |
Xiong`an | Gas Phase II West Extension | 508mm | 1.3MPa | 2024 |
Linyi	China-Russia Eastern Route Interconnection	D355.6	3.0MPa	2024
Liling	Xiangli Branch Line Relocation	D355.6	6.3MPa (design)	2023
Nanjing	Yunmi Road DN600 Gas Relocation	DN600	3.0MPa	2023
Lanzhou	Honggu Xin`an Gas Pipeline | DN400, DN50 | 2.0MPa | 2023 |

Selected project track record (high-temperature and petroleum refining):

Localisation	Project	Moyen	Température	Pressure	Date
Yanan	Refinery Overhead Valve Replacement	Gasoline	120°C	4.0MPa	2025
Ningbo	Terminal Expansion Thermal Oil	Thermal Oil	300°C	4.0MPa	2024
Nanjing	BASF Hot Tapping	Steam	160°C	0.4MPa	2022
Guangzhou	Refinery Heat Exchanger Repair	Gasoline	120°C	1.5MPa	2021
Tianjin	Sinopec Ethylene Plant	Gasoline	250°C	0.59MPa	2020

Selected project track record (steel coking and industrial):

Localisation	Project	Diamètre	Moyen	Pressure	Date
Inner Mongolia	Qinghua Coal Chemical	DN1600	Coal Gas	5Kpa	2024
Qingdao	Power Plant Circulating Water	DN1020	Circulating Water	0.25MPa	2023
Dingzhou	Blast Furnace Air Pipeline	DN1400	Compressed Air	5Kpa	2020
Xinjiang	Jin Yuan Energy Gas Pipeline	DN1300	Coke Oven Gas	4Kpa	2020
China Coal	Ordos Circulating Water	DN1200	Water	0.1MPa	2019

Why clients choose Jinshiwan for large-diameter pipeline projects:

• Transparent, fixed-price quoting with no hidden fees for bypass pumping, traffic control, or restoration
• In-house equipment manufacturer means you never pay third-party rental markups on pipeline plug, pipeline stopple, or hot tapping equipment
• 10-year warranty on all installation workmanship
• 24/7 technical support during active construction phases
• Over 50 large-diameter and high-temperature projects completed in the last 36 months

Service guarantees:

• Fixed-price contracts with defined contingency allowances (no surprise billing)
• 24-hour emergency response for pipeline plug and pipeline stopple deployments
• Free annual inspection for the first 5 years following project completion

Industries served:

• Natural gas transmission and distribution
• Petroleum refining and petrochemical
• Steel manufacturing and coking
• Power generation (circulating water systems)
• Industrial process piping

JSW – Engineered for the long run.

Auteur : Li Chao, Engineering Department Manager, Beijing Jinshiwan Pipeline Technology Co., Ltd. With over a decade of experience managing hot tapping, pipeline plug, pipeline stopple, and pipeline modification projects across natural gas, petroleum refining, high-temperature media, and steel coking applications. Has led more than 50 successful pipeline interventions including high-temperature thermal oil (300°C) and ultra-large diameter (DN1600) low-pressure gas pipeline operations.

Last updated: April 2026