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Methods of sampling and test for liquefied anhydrous ammonia
This British Standard describes methods of test and sampling for liquefied anhydrous ammonia suitable for general industrial purposes.
NOTE 1 In the methods described the ammonia is sampled by volume but the calculations are by mass. The density has been taken as 0.68 g/mL, at about − 33 °C, at which temperature liquid ammonia has a vapour pressure of 105 Pa1). A corrective evaporation factor is applied in each case to allow for loss through sampling at atmospheric pressure.
Clause 2 describes a general method for collecting the test portion with minor variations given for particular methods.
Clause 3 describes a method for the determination of residue on evaporation, which applies to products giving a residue value greater than or equal to 100 mg/kg.
Clause 4 describes a gravimetric method for the determination of the oil content (non-volatile at about 105 °C), which applies to products having an oil content greater than or equal to 10 mg/kg.
Clause 5 describes a method for the determination of the oil content (non-volatile at about 105 °C) in which the method used for the isolation of the oil content is as described in clause 4, but the determination is made using infra-red spectrometry. This is more sensitive than the gravimetric method and applies to products with an oil content less than 10 mg/kg.
Clause 6 describes a method for the determination of the water content by the Karl Fischer method, which applies to products with a water content greater than or equal to 25 mg/kg.
Clause 7 describes the determination of carbon dioxide by a titrimetric method, which applies to products with a carbon dioxide content greater than or equal to 15 mg/kg.
Clause 9 describes a method of sampling for the subsequent determination of oxygen by gas chromatography.
In Appendix A guidance is given on the sampling of anhydrous ammonia and in Appendix B a method for the determination of the evaporation factor, F, is described.
NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.
| SDO | BSI: British Standards Institution |
| Document Number | 4431 |
| Publication Date | June 30, 1989 |
| Language | en - English |
| Page Count | 18 |
| Revision Level | |
| Supercedes | |
| Committee | CII/37 |
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