This prefabricated insulating steam heat pipe adopts integrated "pipe-in-pipe" manufacturing technology finished inside workshop, instead of on-site manual insulation construction. The inner working steel pipe can select spiral welded steel pipe, seamless steel pipe according to project pressure parameters. Intermediate rigid polyurethane foam serves as thermal-insulation medium with low thermal conductivity and high closed-cell ratio. High-density polyethylene or steel-jacket outer casing shields internal layers against underground water penetration and mechanical impact.
The whole set complies with GB/T 29047-2021, DIN30670 and related industry standards. It supports direct underground burial installation, effectively reducing site construction workload and shortening project cycle. Customizable insulation thickness, outer-jacket material and anti-corrosion treatment are available for different soil condition, buried depth and steam temperature requirements. Our service includes technical drawing confirmation, factory pre-production sample inspection, third-party test support and shipment technical documents supply.
Core Product Components
Working Steel Pipe Layer
Spiral submerged-arc welded steel pipe, straight-seam welded pipe or seamless carbon-steel pipe; shot-blasting rust-removal pretreatment for outer surface to boost bonding performance with insulation layer, various diameter & wall-thickness options available.
Polyurethane Foam Insulation Layer
High-density rigid closed-cell polyurethane foam injected under high pressure. Low thermal conductivity, excellent heat preservation, low water absorption, preventing steam heat dissipation outward.
Outer Protective Jacket
HDPE high-density polyethylene casing or steel-jacketed steel pipe. Anti-aging, waterproof and impact-resistant, isolating underground soil, ground water and corrosive medium from internal insulation parts.
Auxiliary Anti-corrosion Accessories
Anti-corrosion coating on steel pipe outer surface, sealing protective caps for pipe ends, matched pre-insulated pipe fittings including elbows, tees and reducers for complete pipeline network connection.
Quality Control Standard
Raw Material Incoming Inspection
All steel base pipes, polyurethane raw materials and HDPE jacket materials are inspected upon arrival. Reject unqualified raw materials before entering production line. Base steel pipes trace to large domestic steel mills such as Baosteel and Tianjin Iron & Steel.
01
In-process Production Monitoring
Supervise steel-pipe surface treatment, high-pressure foaming, casing assembly procedures. Record each batch production parameters for traceability.
02
Physical-performance Laboratory Test
Test foam density, thermal conductivity, closed-cell ratio, compressive strength and water-absorption rate of finished pipes, to guarantee insulation performance meets design indicators.
03
Finished-product Dimension & Appearance Check
Verify outer diameter, wall-thickness, insulation-layer thickness and surface defect inspection.
04
Pre-delivery Document Verification
Issue material certificate, dimension report, non-destructive-testing record. Support ISO9001, API 5L relevant certification documents and third-party inspection report before delivery.
05
FAQ
Q: Which installation modes are available for this pre-insulated steam pipe system?
A: Direct-buried underground installation is the main solution. Above-ground laying is also feasible with additional anti-ultraviolet modification for outer jacket.
Q: What key technical parameters need confirmation when ordering insulating steam heat pipe?
A: Working steam temperature, design pressure, pipe nominal diameter, buried depth, soil corrosiveness and required service life should be offered. Those parameters guide engineers to confirm steel grade, foam thickness and outer-jacket material selection.
Q: Can you produce matched pre-insulated pipe fittings such as elbows and tees together with straight pipes?
A: Yes. We can produce complete supporting insulated fittings. All fittings adopt identical raw-material standard as straight pipes to keep whole pipeline system consistent in thermal-insulation performance.
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