Page images
PDF
EPUB

STUDY AND REPORT ON SPECIFICATIONS FOR VARIOUS

CHEMICALS USED IN WATER TREATMENT P. M. LABach, Chairman;

J. H. GIBBONEY, R. C. BARDWELL,

C. R. KNOWLES, B. W. DEGEER,

C. H. KOYL, J. H. DAVIDSON,

W. A. PARKER,

Sub-Committee.
W. S. C. 1.

STANDARD SPECIFICATIONS FOR SODA ASH TO BE USED

IN WATER TREATMENT Definition.

1. Soda ash is the anhydrous normal carbonate of soda. Classes. 2. Soda ash is commercially divided into two classes : (a) Light;

(b Dense. 3. Dense soda ash shall be rejected

(I) CHEMICAL PROPERTIES AND TESTS. Sampling

4. The samples shall be a fair average of the shipment, and shall be taken from the surface to the center of package.

The vendor shall take a one pound sample from four packages in various locations in each carload or less and forward to the purchaser. The sample, on receipt by the purchaser, shall be immediately transferred to air-tight containers in which the unused portion shall be stored until the soda ash has been finally accepted or rejected by the purchaser.

Check tests on samples taken from cars at their destination will occasionally be made, and should agree within reasonable limits with initial sample. Chemical Properties.

5. (a) The classes and properties of soda ash shall be determined by standard methods of chemical analysis.

(b) Soda ash shall conform to the following requirements as to chemical composition : Normal sodium carbonate-95 per cent. minimum.'

(II) PHYSICAL PROPERTIES AND TESTS. 6. The material shall be in dry powdered form and shall be free from lint, chips, ash or other foreign matter. Fineness.

7. A 100 gram sample shall not have more than 0.5 per cent. by weight, insoluble in cold distilled water.

(III) PACKING AND MARKETING. Packing.

9. Soda ash shall be packed in cloth or duck bags of not more than 100 lb. net weight, or in paper bags of not more than 50 lb. net weight. Marking.

10. The name of manufacturer and net weight shall be plainly marked on each package, or attached by tag thereto.

(IV) INSPECTION, PENALIZATION AND REJECTION. Inspection.

11. (a) All soda ash shall be subjected to inspection.

(b) The soda ash may be inspected at the place of manufacture or point of delivery, or both, as arranged at the time of purchase.

(c) The Inspector representing the purchaser shall have free entry at all times, while work on the contract of the purchaser is being performed, to all parts of the manufacturer's works which concern the manufacture of the soda ash ordered. The manufacturer shall afford the Inspector all reasonable facilities for inspection and sampling, which shall be so conducted as not to interfere unnecessarily with the operation of the works.

(d) The purchaser may make the tests to govern the acceptance, penalization or rejection of the soda ash in his own laboratory or elsewhere. Such tests, however, shall be made at the expense of the purchaser. Penalization.

12. All prices shall be based upon the percentage of normal sodium carbonate. If a lower grade is furnished than the one specified, provided it is not less than 80 per cent sodium carbonate, it may be accepted by the purchaser upon the vendor making a rebate equal to percentage of sodium carbonate below the minimum designated. Rejection.

13. (a) Unless otherwise specified, any rejection based on failure to pass tests prescribed in these specifications shall be reported within 10 working days from the taking or receipt of samples by the purchaser.

(b) Rejected soda ash shall be returned to the shipper or as he may direct. All freight charges in both directions to be paid by the shipper. Rehearing.

14. Samples which represent rejected soda ash shall be preserved in air-tight containers for 10 working days from the date of test report. In case of dissatisfaction with the result of the tests, the manufacturer may make claim for a rehearing within that time.

W. S. C.2.
STANDARD SPECIFICATIONS FOR HYDRATED LIME TO

BE USED IN WATER TREATMENT
Definition.

1. Hydrated lime is a dry flocculent powder resulting from the hydration of quicklime. Classes.

2. Hydrated lime for water treatment is commercially divided into two classes:

(a) High-Calcium;

(b) Calcium. Basis of Purchase.

3. The particular class of hydrated lime desired shall be specified in advance by the purchaser. Unless otherwise specified high-calcium lime shall be furnished.

[merged small][ocr errors]

(I) CHEMICAL PROPERTIES AND TESTS Sampling

4. The sample shall be a fair average of the shipment. Three per cent. of the packages shall be sampled. The sample shall be taken from the surface to the center of the package. A 2-Ib. sample to be sent to the laboratory shall immediately be transferred to an air-tight retainer. in which the unused portion shall be stored until the hydrated lime has been finally accepted or rejected by the purchaser. Check tests on samples taken from cars at their destination will occasionally be made, and should agree within reasonable limits with initial sample. Chemical Properties.

5. (a) The classes and chemical properties of hydrated lime shall be determined by standard methods of chemical analysis.

(b) The hydrated lime shall conform to the following requirements as to chemical composition: High Calcium. . Not less than 90 per cent Calcium Hydroxide (Ca(OH):) Calcium .Not less than 85 per cent Calcium Hydroxide (Ca(OH):)

(II) PHYSICAL PROPERTIES AND Tests Fineness.

6. A 100-gram sample shall leave by weight a residue of not over 2 per cent. on a standard 100-mesh sieve and not over 0.5 per cent. on a standard 20-mesh sieve.

(III) PACKING AND MARKING Packing.

7. Hydrated lime shall be packed either in cloth or in paper bags of not more than 50 lb. net weight.

Marking.

8. The weight shall be plainly marked on each package, together with the name of manufacturer.

(IV) INSPECTION, PENALIZATION AND REJECTION Inspection.

9. (a) All hydrated lime shall be subject to inspection.

(b) The hydrated lime may be inspected either at the place of manufacture or the point of delivery, as arranged at the time of purchase.

(c) The inspector representing the purchaser shall have free entry at all times while work on the contract of the purchaser is being performed, to all parts of the manufacturer's works which concern the manufacture of the hydrated lime ordered. The manufacturer shall afford the inspector all reasonable facilities for inspection and sampling, which shall be so conducted as not to interfere unnecessarily with the operation of the works.

(d) The purchaser may make the tests to govern the acceptance or rejection of the hydrated lime in his own laboratory or elsewhere. Such tests, however, shall be made at the expense of the purchaser. Penalization.

10. All prices shall be based upon the minimum percentage of calcium hydroxide. If a lower grade is furnished than the one specified it may at the option of the purchaser be accepted upon making a rebate equal to the percentage of calcium oxide below the minimum designated. Rejection.

11. (a) Unless otherwise specified, any rejection based on failure to pass tests prescribed in these specifications shall be reported within ten working days from the taking or receipt of samples.

(b) Rejected hydrated lime shall be returned to the shipper or as he may direct. All freight charges to be paid by the shipper in both directions. Rehearing

12. Samples which represent rejected hydrated lime shall be preserved in air tight containers for ten working days from the date of the test report. In case of dissatisfaction with the results of the tests, the manufacturer may make claim for a rehearing within that time.

W. S. C. 3. STANDARD SPECIFICATIONS FOR QUICKLIME TO BE

USED IN WATER TREATMENT Definition.

1. Quicklime for use in water treatment is a material the major part of which is calcium oxide, which will slake on the addition of water. Grades. 2. Quicklime is divided into two grades :

(a) Selected.-Shall be well-burned, picked free from ashes, coke, clinker or other foreign material.

(b) Run-of-Kiln.-Shall be well-burned, without selection. It shall be free from large lumps of unburned or foreign material. Forms. 3. Quicklime is shipped in two forms:

(a) Lump.-Shall be kiln size.

(b) Pulverized.-Shall be reduced in size to pass a 14-in. screen Classes. 4. Quicklime for water treatment is divided into two classes :

(a) High-Calcium.

(b) Calcium. Basis of Purchase.

5. The particular grade, form and class of quicklime desired shall be specified in advance by the purchaser. Unless otherwise specified high-calcium quicklime shall be furnished.

(1) CHEMICAL PROPERTIES AND Tests

(A) SAMPLING Lime in Barrels.

6. Quicklime shall be shipped in barrels, or other containers of similar size. At least 3 per cent of the number of barrels shall be sampled. They shall be taken from various parts of the shipment, dumped, mixed and sampled. The samples shall comprise at least 10 shovelsful taken from different parts of the shipment. The total sample taken shall weigh at least 100 lb. and shall be crushed to pass a 1-in. ring, and quartered to provide a 15-1b. sample for the laboratory. Laboratory Samples.

7. All samples to be sent to the laboratory shall be immediately transferred to an air-tight container in which the unused portion shall be stored until the quicklime shall finally be accepted or rejected by the purchaser.

Check tests on samples taken from car at destination will occasion-ally be made, and should agree within reasonable limits with initial sample.

« PreviousContinue »