Application guide
Isophthalic Resin for Oil Storage Tank Linings and Chemical Equipment
FRP linings for oil storage tanks and the fabrication of chemical equipment with the isophthalic grade SPR 301 OT, and when SPR 301 OS or vinyl ester is the better fit for the service.
An isophthalic grade listed for oil-tank linings.
An FRP lining turns a steel or concrete tank into one whose contents touch only a resin-rich laminate. For oil storage, the Samrat Poly Resins, India catalogue offers Oil Storage Tank Grade Resin (SPR 301 OT), an isophthalic grade with good electrical and heat-resistance properties, listed for the FRP lining of oil storage tanks and for chemical-equipment manufacturing. The SPR 301 OT knowledge hub explains the grade; this guide covers the lining work and the alternatives.
What manufacturers build
Two groups use this grade. Lining contractors apply FRP linings inside oil storage tanks, working on prepared tank walls and floors. Equipment fabricators build FRP chemical equipment — vessels, hoods, covers and similar items — where an isophthalic laminate is specified. The catalogue lists exactly these two uses: FRP lining for oil-storage tanks and chemical-equipment manufacturing.
Why this material suits the work
SPR 301 OT is listed as a clear, pale-yellow to light-amber liquid of 300–600 cPs at 25 °C, with a gel time of 15–35 minutes at 25 °C, specific gravity 1.04–1.14 and 33–45% styrene by weight, supplied non-accelerated. The working time suits lining large internal surfaces in stages. Chemical-resistance wording describes the service the grade is intended for; it is not a compatibility chart. The specific oil or product stored, any water or additives in it, and the temperature decide whether a lining will last, and those must be stated when you enquire. Decision rule: SPR 301 OT for oil-storage linings; SPR 301 OS where the contents are organic solvents; Vinyl Ester Resin where the service is more aggressive chemically — see the vinyl ester chemical-tank guide. The three-way comparison sets them side by side.
Required resin characteristics
- An isophthalic resin positioned for oil-storage lining service
- Good electrical and heat-resistance properties, as the catalogue lists
- A viscosity that wets out mat and veil on walls and floors (300–600 cPs listed)
- A working time that allows large areas to be lined in stages (15–35 minutes listed)
- A service description — stored product, water content, temperature — agreed before specifying
Process context
A typical lining job starts with cleaning and preparing the tank surface, followed by hand lay-up of catalysed resin with glass mat, and often a surface veil for a resin-rich inner layer, rolled to remove air and built up to the thickness the design calls for; joints and corners get extra attention. Equipment fabrication follows the same hand lay-up practice on moulds. The catalogue reference cure for SPR 301 OT is MEKP 1.5% with cobalt octoate 0.4%. The peroxide and the cobalt accelerator are added to the resin separately, one after the other with mixing in between; a concentrated peroxide is never mixed directly with cobalt. Surface-preparation methods and lining thickness are project decisions, not published values; agree them before work starts. The figures are typical catalogue values that describe the grade, not batch guarantees, and dosage for your workshop temperature is settled by trial.
Advantages
- Catalogue-listed specifically for the FRP lining of oil storage tanks
- Isophthalic chemistry with good electrical and heat-resistance properties listed
- Also listed for chemical-equipment manufacturing
- A 15–35 minute gel time that suits staged lining of large surfaces
Common products
- FRP linings inside steel oil storage tanks
- FRP linings for concrete oil pits and tanks
- FRP chemical-equipment vessels and covers
- Hoods and housings for chemical equipment
Common questions
No compatibility list is published. The catalogue positions it for oil-storage tank linings; the specific product stored, its water content and temperature decide suitability, so state them on enquiry.
When the tank holds organic solvents rather than oil. SPR 301 OS is the catalogue’s organic-solvent-resistant isophthalic grade.
When the service is chemically more aggressive than an isophthalic lining is intended for. Vinyl Ester Resin is documented for chemical and corrosion service; the actual medium, concentration and temperature decide.
It is the catalogue’s description of the grade. No electrical test values are published, so if your project needs a specific electrical figure, raise it on enquiry.
Lining an oil storage tank?
Send the tank size and material, the stored product, its temperature and the lining area. Samrat Poly Resins, India manufactures the grade and issues its technical information. Samrat FRP Traders is the Nepal supplier and importer and handles enquiries; price, packaging, lead time and stock in Nepal are confirmed on enquiry.
Contact Samrat FRP Traders