PipeWrap® BT
Hot-applied anti-corrosive bituminous tape that wraps buried and immersed steel pipes to form a seamless external corrosion barrier.
PipeWrap® BT at a glance
The essentials specifiers and contractors ask first — answered straight from the product data, with links to go deeper.
What is it?
PipeWrap® BT is STP Limited's hot-applied anti-corrosive bituminous tape — a specially formulated corrosion-resistant bitumen compound that is wrapped over primed steel pipework to build a continuous external protective coating.
Where is it used?
It is used to externally protect buried and immersed steel pipelines and their fittings in highly corrosive ground, including drinking-water, raw-water and fire-fighting mains, and field/joint coating where the line cannot be plant-coated.
Why use it?
Its high softening point resists flow and sagging at elevated buried temperatures, its high penetration value reflects a tough, adherent compound, and its high ageing resistance supports long maintenance-free service life conforming to IS: 10221, Appendix B.
How is it applied?
The pipe is cleaned to bare metal, primed with ShaliPrime® PW BT or ShaliBond® BS/CS at 0.3–0.5 L/m², and the bituminous tape is then hot-applied and wrapped over the primed surface with adequate overlap. Always follow the current TDS for surface preparation and application.
Key advantages
- Forms a continuous, seamless external barrier on steel pipe by hot-fusing across overlaps rather than relying on discrete cold-tape laps
- High softening point (65–121 °C) resists flow, sag and cold-flow under warm buried conditions
- High penetration value (3–20) reflects a tough, well-adhered bitumen compound that resists soil stress
- High resistance to ageing supports a long, maintenance-free service life on buried and immersed lines
- Heat-resistant cured film does not dip even at 100 °C
- Conforms to IS: 10221, Appendix B for protective coatings on buried steel pipelines
- Available in multiple thicknesses (2/3/4 mm) and widths (250/500/1000 mm) to match pipe diameter and required build
- Compatible with STP's matched primer system (ShaliPrime® PW BT or ShaliBond® BS/CS) for reliable adhesion
Specifications
- Product type: Hot-applied anti-corrosive bituminous tape (pipe wrap)
- Softening point: 65 – 121 °C
- Penetration (25 °C, 100 g, 5 s): 3 – 20
- Heat resistance: Does not dip at 100 °C
- Ageing resistance: High resistance to ageing
- Recommended primer: ShaliPrime® PW BT or ShaliBond® BS/CS
- Primer dosage: 0.3 – 0.5 L/m²
- Available thicknesses: 2 mm, 3 mm & 4 mm
- Available widths: 250 / 500 / 1000 mm
- Roll length: 2 mm: 20 m; 3 mm & 4 mm: 10 m per roll
- Reference standard: Conforming to IS: 10221, Appendix B
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About PipeWrap® BT
A plain-language overview of what PipeWrap® BT is, the problem it solves and how Space Arc Engineering positions it in a specification.
PipeWrap® BT from STP Limited (Shalimar Tar Products) is a hot-applied anti-corrosive bituminous tape used to protect the external surface of steel pipelines against soil-side and immersion corrosion. It is a specially formulated, corrosion-resistant bitumen compound supplied in roll form; once the pipe is primed and the tape is heat-bonded and wrapped, it consolidates into a continuous, monolithic coating that seals the steel away from moisture, oxygen and aggressive ground salts.
The system is intended for buried and immersed pipes, fittings and appurtenances operating in highly corrosive environments — typically drinking-water, raw-water and fire-fighting pipelines, including raw-water lines at thermal power plants. It is equally valuable as a field and joint coating, where welded joints, bends and repairs on otherwise factory-coated lines need on-site protection that matches the rest of the pipeline.
Space Arc Engineering supplies PipeWrap® BT together with the correct STP primer system and can advise on tape thickness, width and primer selection to suit pipe diameter, soil aggressivity and site conditions. As a hot-applied tape it sits between simple cold-applied wrapping tapes and full plant-applied coatings, giving site teams a robust, field-friendly barrier for water and utility pipework.
The technical insight
Why PipeWrap® BT behaves the way it does — the mechanism behind the performance, in specifier-friendly terms.
Bituminous pipe-wrap protection works on the principle of exclusion: corrosion of buried steel is an electrochemical process that needs water, oxygen and an electrolyte path through the soil, so a thick, continuous, water-impermeable bitumen film starves that reaction. The bitumen compound in PipeWrap® BT is blended for a high softening point (65–121 °C) so the coating does not flow or sag against warm soil or pipe-wall temperatures, and for controlled penetration (3–20 at 25 °C, 100 g, 5 s) which indicates a firm yet workable compound that bonds well without becoming brittle. Because the tape is hot-applied, the heat softens the compound at the bond line so it self-fuses across overlaps and conforms tightly around welds and fittings, eliminating the discrete lap seams that are the usual weak point of cold tapes. A compatible bituminous primer (ShaliPrime® PW BT or ShaliBond® BS/CS at 0.3–0.5 L/m²) is essential — it wets the cleaned steel, displaces residual moisture and creates the chemical key that anchors the tape; the heat resistance of the cured wrap (does not dip at 100 °C) and its high resistance to ageing are what allow it to conform to IS: 10221, Appendix B for long-term buried service.
Where PipeWrap® BT is used
Typical applications PipeWrap® BT is specified for, supplied by Space Arc Engineering across Delhi NCR, Ghaziabad, Noida and Uttar Pradesh.
- External anti-corrosion wrapping of buried steel water mains
- Protection of drinking-water and raw-water steel pipelines
- Fire-fighting pipeline external corrosion protection
- Raw-water pipelines at thermal power plants
- Field and joint coating of welds, bends and repairs on steel lines
- Protection of buried and immersed pipes, fittings and appurtenances in highly corrosive ground
- On-site coating of factory-coated lines where joints need matching protection
Key advantages
The properties that make PipeWrap® BT the right choice — drawn from the manufacturer's product literature.
- Forms a continuous, seamless external barrier on steel pipe by hot-fusing across overlaps rather than relying on discrete cold-tape laps
- High softening point (65–121 °C) resists flow, sag and cold-flow under warm buried conditions
- High penetration value (3–20) reflects a tough, well-adhered bitumen compound that resists soil stress
- High resistance to ageing supports a long, maintenance-free service life on buried and immersed lines
- Heat-resistant cured film does not dip even at 100 °C
- Conforms to IS: 10221, Appendix B for protective coatings on buried steel pipelines
- Available in multiple thicknesses (2/3/4 mm) and widths (250/500/1000 mm) to match pipe diameter and required build
- Compatible with STP's matched primer system (ShaliPrime® PW BT or ShaliBond® BS/CS) for reliable adhesion
Limitations & considerations
Where PipeWrap® BT is not the right answer. Check these constraints from the manufacturer before specifying — using it outside its scope is the most common cause of failure.
- It protects the external surface of pipe only — it is not an internal/potable-contact lining and is not a structural strengthening product
- Adhesion and long-term performance depend on correct surface preparation and priming; oil, scale, rust or damp steel will compromise the bond
- As a hot-applied tape it needs heating and competent site technique; in confined or fire-sensitive locations the hot-work and fume controls must be planned for
- It is a barrier coating, not a cathodic-protection system — on long or critically buried mains it is normally used in conjunction with CP, not as a replacement
- STP's official field of application lists water, fire-fighting and raw-water pipelines; gas-distribution service is not stated in the TDS, so confirm suitability with STP for any gas application
Selection & best practice
How to decide whether PipeWrap® BT fits your job — and how to apply it so the repair lasts.
Specify PipeWrap® BT where you need a robust, field-applicable external coating for buried or immersed steel water, raw-water or fire-fighting pipework, and especially for on-site joint and field coating of welds, bends and repairs that cannot be plant-coated. Choose a thicker tape (3 mm or 4 mm) and wider rolls for larger-diameter pipe and more aggressive soils, and the 2 mm grade where a lighter build is acceptable. Where the line is long, critical or under impressed-current/sacrificial cathodic protection, treat the wrap as the primary barrier and the CP as the back-up; for cold-application-only sites or where hot work is prohibited, discuss a cold-applied tape alternative with Space Arc Engineering instead.
Application best practice
- Clean the pipe to bare, dry, sound metal — remove rust, mill scale, oil and dust so the primer can key directly to steel
- Apply the matched primer (ShaliPrime® PW BT or ShaliBond® BS/CS) at 0.3–0.5 L/m² and allow it to become tacky before wrapping
- Apply the tape hot and wrap under even tension with adequate spiral overlap so adjacent turns fuse into a continuous film
- Give extra attention to welds, bends, flanges and fittings — work the softened compound fully around irregular profiles to avoid voids
- Inspect the finished wrap for holidays, pinholes and lap defects (holiday/spark testing where specified) before backfilling
- Backfill carefully with screened, stone-free material so sharp aggregate does not penetrate the coating during compaction
Specifications
Indicative properties from the manufacturer's literature. Always confirm batch-specific values against the current TDS before specification.
| Product type | Hot-applied anti-corrosive bituminous tape (pipe wrap) |
|---|---|
| Softening point | 65 – 121 °C |
| Penetration (25 °C, 100 g, 5 s) | 3 – 20 |
| Heat resistance | Does not dip at 100 °C |
| Ageing resistance | High resistance to ageing |
| Recommended primer | ShaliPrime® PW BT or ShaliBond® BS/CS |
| Primer dosage | 0.3 – 0.5 L/m² |
| Available thicknesses | 2 mm, 3 mm & 4 mm |
| Available widths | 250 / 500 / 1000 mm |
| Roll length | 2 mm: 20 m; 3 mm & 4 mm: 10 m per roll |
| Reference standard | Conforming to IS: 10221, Appendix B |
Coverage, dosage, pack sizes and cure times vary with substrate and conditions — request the full TDS for certified technical data.
Industry use cases
Real-world scenarios where PipeWrap® BT is the practical choice — the teams who reach for it and the jobs it does for them.
- Municipal water-supply and distribution networks laying buried steel mains
- Thermal power plants protecting raw-water and cooling-water steel pipelines
- Industrial and infrastructure fire-fighting ring mains
- Utility and pipeline contractors needing in-field joint/weld coating
- Plants and facilities with buried steel pipework in aggressive, high-salinity or marshy soils
Frequently asked questions
Common questions about specifying and sourcing PipeWrap® BT.
What is PipeWrap® BT?
It is STP Limited's hot-applied anti-corrosive bituminous tape — a corrosion-resistant bitumen compound supplied in rolls that is heat-applied and wrapped over primed steel pipe to form a continuous external protective coating conforming to IS: 10221, Appendix B.
Where is PipeWrap® BT used?
It externally protects buried and immersed steel pipelines and fittings in highly corrosive ground — typically drinking-water, raw-water and fire-fighting mains, including raw-water lines at thermal plants — and is widely used for on-site field and joint coating of welds and repairs.
What primer should be used with it?
A matched bituminous primer is required: ShaliPrime® PW BT or, alternatively, ShaliBond® BS/CS, applied at 0.3–0.5 L/m² over cleaned, dry steel. The primer keys the tape to the pipe and is essential for long-term adhesion.
What thicknesses, widths and lengths are available?
The tape is available in 2 mm, 3 mm and 4 mm thicknesses and 250, 500 and 1000 mm widths. The 2 mm rolls are 20 m long, while the 3 mm and 4 mm rolls are 10 m long. Space Arc Engineering can advise on the right combination for your pipe size and soil.
What are its key performance figures?
It has a softening point of 65–121 °C and a penetration of 3–20 (at 25 °C, 100 g, 5 s), does not dip at 100 °C, and offers high resistance to ageing — the basis for its long buried service life under IS: 10221, Appendix B.
Can it be used on gas pipelines?
STP's official field of application lists water, raw-water and fire-fighting pipelines; gas-distribution service is not stated in the current TDS. For any gas application, confirm suitability with STP through Space Arc Engineering before specifying.
Does PipeWrap® BT replace cathodic protection?
No. It is a barrier coating that dramatically reduces the corroding surface area, but on long or critical buried mains it is normally combined with cathodic protection rather than used as a standalone substitute.
References
Manufacturer and technical sources this page draws on. Always confirm current data against the live TDS before specification.
Source PipeWrap® BT for your project
Space Arc Engineering is an authorised distributor for STP, serving Delhi NCR, Ghaziabad, Noida and Uttar Pradesh. Talk to us for pricing, the technical data sheet and on-site support.
Or email info@space-arc.com · www.space-arc.com