STP PipeWrap BT
Hot-applied bituminous wrapping tape to IS 10221 (Appendix B) that torch-fuses around primed steel pipelines, giving buried and immersed water, fire-fighting and raw-water lines one seamless external corrosion barrier.
What is it?
A hot-applied, multi-layer anti-corrosive bituminous tape from STP Limited, faced on both sides with high-tensile HMHDPE film; the 3 mm and 4 mm grades add a 45 gsm fibre-glass core for extra toughness.
Where is it used?
Buried and immersed steel pipes, fittings and appurtenances in highly corrosive ground — drinking-water mains, fire-fighting networks and raw-water pipelines at thermal power stations.
Why use it?
Torch-fusing the spiral overlaps produces a monolithic sleeve with no adhesive joints to peel, and its 65–121 °C softening range plus IS 10221 compliance suit Indian buried-service conditions and tender specifications.
How is it applied?
Clean the pipe to bright, dry metal, prime with ShaliPrime PW BT or ShaliBond BS/CS at 0.3–0.5 L/m², then torch-apply the tape spirally under tension with a minimum 25 mm overlap and inspect before backfilling.
About STP PipeWrap BT
STP PipeWrap BT is a factory-made bituminous wrapping tape for the external corrosion protection of buried and immersed steel pipelines, manufactured to IS 10221, Appendix B. The compound is a specially formulated corrosion-resistant bitumen with a deliberately wide softening range of 65–121 °C, sandwiched between thermo-fusible HMHDPE films on both faces. The 2 mm grade is a five-layer construction; the 3 mm and 4 mm grades are seven-layer tapes carrying two inner cores — a tough 45 gsm fibre-glass layer on top and a high-tensile HMHDPE layer below — so the heavier grades stand up to rougher trench and backfill conditions.
Space Arc Engineering supplies PipeWrap BT with its matched primers to water boards, EPC contractors and industrial clients across Delhi NCR and pan-India. It is a familiar line item on municipal water-supply tenders, fire-main installations and thermal-plant raw-water packages, where a torch, a primed pipe and a trained wrapping crew are all the site needs — there is no mixing, no pot life and no cure time before the line can be holiday-tested and backfilled.
The technical insight
Soil-side corrosion needs an electrolyte in contact with bare steel; PipeWrap BT works by denying that contact permanently. When the torched face of the tape meets the primed pipe, the bitumen compound melts and wets the surface, and each successive spiral lap fuses into the one below — so the finished wrap behaves as a single extruded sleeve rather than a series of taped joints. The primer (0.3–0.5 L/m²) does the chemical work of bonding bitumen to steel, while the HMHDPE facing films carry the mechanical loads: soil stress, backfill impact and handling. The compound itself is tuned at both ends of the temperature scale — it does not sag or dip at 100 °C, yet remains pliable without breaking at 15 °C, with a minimum 15% elongation in both directions to follow minor pipe movement and settlement without cracking the barrier.
Where it is used
- External wrapping of buried steel drinking-water transmission and distribution mains
- Corrosion protection of buried fire-fighting pipeline networks and hydrant rings
- Raw-water and make-up water pipelines at thermal power plants
- Buried and immersed pipes, fittings and appurtenances in highly corrosive soils
- Field-joint wrapping over welds after hydro-testing, using the 200 mm end hold-back
- Wrapping of bends, tees, flanged sections and repair areas on coated lines
- Re-wrapping of aged pipeline coatings exposed during maintenance excavations
Key advantages
- Heat-fused overlaps create a continuous, monolithic barrier with no glued seams to peel back in service
- Wide 65–121 °C softening range — no sagging at 100 °C, so warm buried and plant conditions do not soften the wrap
- Stays pliable at 15 °C with 15% minimum elongation, tolerating handling and pipe settlement without cracking
- HMHDPE films on both faces, plus a 45 gsm fibre-glass core in 3 mm and 4 mm grades, resist soil stress and backfill damage
- Manufactured to IS 10221 (Appendix B), simplifying specification and QA on government water-supply tenders
- Three thicknesses (2/3/4 mm) and three widths (250/500/1000 mm) let you match grade to pipe diameter and soil aggressivity
- Matched ShaliPrime PW BT / ShaliBond BS/CS primer system gives single-source supply responsibility
- No curing period — wrap, inspect and backfill in one continuous sequence
Limitations & considerations
- Torch application is hot work: permits, fire watch and trained wrapping crews are non-negotiable on site
- Performance depends entirely on surface preparation and priming — the primer must reach touch-dry (about 5–25 minutes) before wrapping
- External protection only; it is not an internal or potable-contact lining
- A barrier coating, not a substitute for cathodic protection — critical or long transmission lines normally use both
- Sharp or stony backfill can puncture the wrap, so screened, stone-free backfill material is required
- The 2 mm grade has no fibre-glass core; specify 3 mm or 4 mm where trench conditions are rough
Selection & best practice
Bring the pipe to bare, dry, sound metal — remove rust, scale, oil and dust by blasting, wire brush or compressed air, and leave 200 mm unwrapped at pipe ends so welded joints can be made, hydro-tested and wrapped at site afterwards. Apply ShaliPrime PW BT or ShaliBond BS/CS at 0.3–0.5 L/m² and let it become touch-dry (typically 5–25 minutes). Play the torch flame across the tape face until the bitumen is soft and glossy, then wrap spirally onto the primed surface with firm, even tension, keeping a minimum 25 mm overlap between adjoining layers and working out pockets and bridging as you go. Finish tape joints facing downward on the outside of the lap so ground water sheds over, not into, the seam. Wrapping is best done at the time of pipe erection and lowering to avoid handling damage. Inspect the full wrap for holidays, pinholes and lap defects before the trench is closed, then backfill with screened, stone-free material. Store rolls under shed away from heat and never stack more than three rolls per column.
Specifications
| Reference standard | IS 10221, Appendix B |
| Softening point | 65–121 °C |
| Penetration (25 °C, 100 g, 5 s) | 3–20 |
| Heat resistance | Does not sag/dip at 100 °C |
| Pliability at 15 °C | Does not break |
| Elongation, minimum (length & cross) | 15% |
| Thicknesses | 2 mm, 3 mm, 4 mm |
| Roll widths | 250 mm, 500 mm, 1000 mm |
| Roll length | 20 m (2 mm); 10 m (3 mm & 4 mm) |
Industry use cases
Municipal Water Supply
IS 10221-compliant wrapping of buried MS drinking-water mains on water-board and Jal Jeevan-type schemes, where tender QA asks for a certified external coating system.
Thermal Power
Raw-water and make-up pipelines running through plant fill and ash-influenced soils, where aggressive ground chemistry demands a heavy-duty 3–4 mm reinforced wrap.
Fire Protection
Buried fire ring mains and hydrant networks at factories, warehouses and refineries, keeping standby lines corrosion-free for decades between excavations.
Industrial Estates
Cross-plant utility and process water piping crossing chemically contaminated or waterlogged ground between units.
Pipeline Rehabilitation
Spot re-wrapping of welds, bends and coating repairs exposed during maintenance digs, fusing new tape onto sound existing bituminous coating.
Frequently asked questions
What is the difference between the 2 mm, 3 mm and 4 mm grades?
Which primer does PipeWrap BT need and at what coverage?
Does PipeWrap BT comply with an Indian standard?
Can it be used along with cathodic protection?
How are overlaps and weld joints handled?
What pack sizes are available and how should rolls be stored?
How we position STP PipeWrap BT
PipeWrap BT sits at the value end of buried-pipeline protection: a torch-applied, IS 10221-compliant system that Indian water and power contractors have used for decades. Specify it as a system with its own primers — ShaliPrime PW BT or ShaliBond BS/CS — rather than mixing brands at the bond line, since adhesion to steel is where wrap systems succeed or fail. Within the STP family, Space Arc also supplies the wider bituminous range, including APP-modified membranes such as SuperThermoLay for horizontal waterproofing on the same projects. There is no direct Fosroc equivalent for hot-applied pipe-wrapping tape; where the steel runs above ground or inside plant buildings, a liquid-applied epoxy or polyurethane coating system from our Fosroc or Sika protective-coatings ranges is normally the better specification, and our team can recommend one against your exposure conditions.
Related Protective Coatings products
Source STP PipeWrap BT for your project
Authorised distribution, technical advice & professional application across Delhi NCR and Pan-India.