Supply of Linseed Oil

The company invites bids for the supply of Qty= 240000 L, a vegetable oil obtained by pressing the crushed seeds of flax plant linum usitatissimum. It is used in drilling mud as mud lubricant in top hole drilling.

The Specifications includes the following:-

1. Physical Properties: The material, as received, should be golden yellow, brownish yellow coloured clear viscous liquid free from suspended solids/impurities and other adulterants.
2. Density at 26 +/- 2 degC: 0.9230 - 0.9280
3. Acid value, mgKOH/gm, maximum: 10.00
4. Moisture content, % by mass, max. : 0.25
5. Refractive Index at 40 degC: 1.4720 - 1.4750
6. Performance Test:
A. Lubricity test-
(i) In fresh water mud : Prepare a 7.5% (w/v) bentonite suspension in distilled water using OIL approved bentonite and stir it for 15 minutes in multimixer so that no lumps are left after the stirring period. Age the suspension for 72 hrs. at 90 +/- 2 degC. After the lapse of aging period, adjust apparent viscosity of the suspension to 15 +/- 1 cp by dilutionwith distilled water. To this, add 0.5% (w/v) of the sample while stirring, after completion of addition, stir further for 30 minutes in a multimixer. Measure lubricity co-efficient by using a lubricity tester. Lubricity co-efficient should not be more than 0.15

(ii) In saline water mus - Prepare a 10% (w/v) bentonite suspension in distilled water using OIL approved bentonite and stir for 15 min, in multimixer so that no lumps are left after the stirring period. Age the suspenson for 72 hrs at 90 +/- 2 degC. After lapse of aging period, add 4% NaCl (w/v) (AR grade) and stir for 15 minutes in a multimixer. Age the suspension for 24 hrs. at 26 +/- 2 degC. Adjust the apparent viscosity to 15 +/- 1 cp by dilution with 4% NaCl solution, if necessary. To this saline mud, add 0.50% (w/v) of the sample in sirring condition and stir further for 30 minutes in a multimixer. Measure lubricity co-efficient by using a lubricity tester. Lubricity co-efficient should not be more than 0.20

B. Extreme Pressure Lubrication test - (i) In fresh water mud - Prepare a 7.5% (w/v) bentonite suspension in distilled water using OIL approved bentonite and stir it for 15 minutes in multimixer so that no lumps are left after the stirring period. Age the suspension for 72 hrs. at 90 +/- 2 degC. After the lapse of aging period, adjust apparent viscosity of the suspension to 15 +/- 1 cp by dilution with distilled water and filter through 200 BSS mesh or equivalent sieve. Add 0.5% (w/v) of the sample to the bentonite suspensin while stirring. After completion of addition, stir again in the multimixer for 30 min. Determine the film strength of the mus at 250 in-lb load with the help of a E.P. lubricity tester. The film strength should be 20,000 psi minimum.

(ii) In saline water mud - Prepare a 10% (w/v) bentonite suspension in distilled water using OIL approved bentnite and stir for 15 min. in multimixer so that no lumps are left after the stirring period. Age the suspesion for 72 hrs at 90 +/- 2 degC. After lapse of aging period, add 4% NacL (w/v) (AR grade) and stir for 15 minutes in a multimixer. Age the suspension for 24 hrs. at 26 +/- 2 degC. Adjust the apparent viscosity to 15 +/- 1 cp by dilution with 4% NaCl solution, if necessary and filter through 200 BSS mesh or equivalent sieve. Add 0.5% (w/v) of the sample while stirring and stir further for 30 minutes in multimixer. Determine the film strength of the mud at 250 in-lb load with the help of a E.P. lubricity tester. The film strength sould be 15,000 psi, minimum

C. Foam Test : Prepare a 7.5% (w/v) bentonite suspension in distilled water using OIL approved bentonite and stir for 15 min. in multimixer. Age the suspension for 24 hrs. at 26 +/- 2 degC. Adjust the apparent viscosity of the suspension to 15 +/- 1 cp by dilution with distilled water. Add 0.5% (w/v) of the sample to it and stir for 30 minutes in a mutimixer. Determine the specific gravity of the mud. The specific gravity of the mud should not be less than 0.8