This part of ISO 4266 gives guidance on the accuracy, installation, commissioning, calibration and verification of automatic level gauges (ALGs) both intrusive and non-intrusive, for measuring the level of petroleum and petroleum products having a vapour pressure less than 4 MPa, stored in pressurized storage tanks.<\/p>\n
This part of ISO 4266 gives guidance on the use of ALGs in custody transfer application.<\/p>\n
This part of ISO 4266 is not applicable to the measurement of level in caverns and refrigerated storage tanks with ALG equipment.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 3<\/td>\n | TitlePage – Petroleum and liquid petroleum products\ufffd\u2014 Measurement of level and temperature in sto… <\/td>\n<\/tr>\n | ||||||
| 5<\/td>\n | TableofContent – Contents Page <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Foreword – Foreword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Scope – 1\ufffd\ufffd\ufffd Scope NormativeReference – 2\ufffd\ufffd\ufffd Normative reference <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Clause1 – 4\ufffd\ufffd\ufffd Precautions Subclause2 – 4.1\ufffd\ufffd\ufffd Safety precautions Subclause2 – 4.2\ufffd\ufffd\ufffd Equipment precautions UntitledSubclause3 – 4.2.1\ufffd\ufffd\ufffd All of the ALG equipment should be capable of withstanding the pres… UntitledSubclause3 – 4.2.2\ufffd\ufffd\ufffd ALGs should be certified for use in the hazardous-area classificati… UntitledSubclause3 – 4.2.3\ufffd\ufffd\ufffd Measures should be taken to ensure that all exposed metal parts of … UntitledSubclause3 – 4.2.4\ufffd\ufffd\ufffd All ALG equipment should be maintained in safe operating condition … Subclause2 – 4.3\ufffd\ufffd\ufffd General precautions UntitledSubclause3 – 4.3.1\ufffd\ufffd\ufffd The general precautions given in UntitledSubclause3 – 4.3.2\ufffd\ufffd\ufffd The measurement of tank vapour pressure and temperature, liquid tem… UntitledSubclause3 – 4.3.3\ufffd\ufffd\ufffd All data measured for bulk transfer should be recorded promptly whe… UntitledSubclause3 – 4.3.4\ufffd\ufffd\ufffd Whenever determinations of the contents of a tank are made before t… UntitledSubclause3 – 4.3.5\ufffd\ufffd\ufffd All parts of the ALG in contact with the product or its vapour shou… UntitledSubclause3 – 4.3.6\ufffd\ufffd\ufffd ALGs should have sufficient dynamic response to track the liquid le… UntitledSubclause3 – 4.3.7\ufffd\ufffd\ufffd Following the transfer of product, the tank should be allowed to se… UntitledSubclause3 – 4.3.8\ufffd\ufffd\ufffd Following a rapid change in the ambient conditions, the liquid surf… UntitledSubclause3 – 4.3.9\ufffd\ufffd\ufffd ALGs should provide security to prevent unauthorized adjustment or … <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Clause1 – 5\ufffd\ufffd\ufffd Accuracy Subclause2 – 5.1\ufffd\ufffd\ufffd Intrinsic error of ALGs Subclause2 – 5.2\ufffd\ufffd\ufffd Calibration prior to installation Subclause2 – 5.3\ufffd\ufffd\ufffd Error caused by installation and operating conditions Subclause2 – 5.4\ufffd\ufffd\ufffd Overall accuracy Subclause3 – 5.4.1\ufffd\ufffd\ufffd General <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Subclause3 – 5.4.2\ufffd\ufffd\ufffd Use of ALGs for fiscal\/custody transfer applications Clause1 – 6\ufffd\ufffd\ufffd Installation of ALGs Subclause2 – 6.1\ufffd\ufffd\ufffd General Subclause2 – 6.2\ufffd\ufffd\ufffd Mounting location UntitledSubclause3 – 6.2.1\ufffd\ufffd\ufffd The mounting location of an ALG may affect the installed accuracy. … UntitledSubclause3 – 6.2.2\ufffd\ufffd\ufffd The ALG should preferably be mounted as close as practical to the v… UntitledSubclause3 – 6.2.3\ufffd\ufffd\ufffd The level-sensing element should be protected against excessive tur… Subclause2 – 6.3\ufffd\ufffd\ufffd Manufacturer\u2019s requirements Subclause2 – 6.4\ufffd\ufffd\ufffd Installation Subclause3 – 6.4.1\ufffd\ufffd\ufffd Installation of intrusive ullage ALGs (e.g. float-operated and servo-operat… UntitledSubclause4 – 6.4.1.1\ufffd\ufffd\ufffd For fiscal\/custody transfer application accuracy, the ALG should … UntitledSubclause4 – 6.4.1.2\ufffd\ufffd\ufffd For ease of maintenance and verification, the ALG should be insta… Subclause3 – 6.4.2\ufffd\ufffd\ufffd Installation of intrusive ullage ALGs (e.g. float and servo-operated types)… UntitledSubclause4 – 6.4.2.1\ufffd\ufffd\ufffd For fiscal\/custody transfer application accuracy and for operatio… <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | UntitledSubclause4 – 6.4.2.2\ufffd\ufffd\ufffd For ease of maintenance and verification, the ALG should be insta… Subclause3 – 6.4.3\ufffd\ufffd\ufffd Installation of non-intrusive ullage ALGs (e.g. microwave or radar) mounted… UntitledSubclause4 – 6.4.3.1\ufffd\ufffd\ufffd For fiscal\/custody transfer application accuracy, and also for op… UntitledSubclause4 – 6.4.3.2\ufffd\ufffd\ufffd A datum plate which may serve as a reflector plate (shown in UntitledSubclause4 – 6.4.3.3\ufffd\ufffd\ufffd The construction of the ALG may not require the installation of a… UntitledSubclause4 – 6.4.3.4\ufffd\ufffd\ufffd Adequate means should be provided (e.g. verification pins positio… Subclause3 – 6.4.4\ufffd\ufffd\ufffd Location of ALG Subclause3 – 6.4.5\ufffd\ufffd\ufffd Installation of ALGs other than those described in this part of ISO 4266 Subclause2 – 6.5\ufffd\ufffd\ufffd Still-well design UntitledSubclause3 – 6.5.1\ufffd\ufffd\ufffd The still-well should be suspended from the top of the tank. The lo… UntitledSubclause3 – 6.5.2\ufffd\ufffd\ufffd The diameter and thickness of the still-well should be designed to … UntitledSubclause3 – 6.5.3\ufffd\ufffd\ufffd The distance from the lower end of the still-well to the bottom of … UntitledSubclause3 – 6.5.4\ufffd\ufffd\ufffd The still-well perforations (slots or holes typically UntitledSubclause3 – 6.5.5\ufffd\ufffd\ufffd After the tank has been hydrostatically tested, the still-well shou… <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Clause1 – 7\ufffd\ufffd\ufffd Initial setting and initial verification of ALGs in the field Subclause2 – 7.1\ufffd\ufffd\ufffd Preparation Subclause3 – 7.1.1\ufffd\ufffd\ufffd Check for critical distances Subclause3 – 7.1.2\ufffd\ufffd\ufffd Check for free movement of level-sensing element of intrusive ALGs Subclause3 – 7.1.3\ufffd\ufffd\ufffd Check for influences of changes in physical and electrical properties of th… Subclause2 – 7.2\ufffd\ufffd\ufffd Initial setting Subclause3 – 7.2.1\ufffd\ufffd\ufffd General <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Subclause3 – 7.2.2\ufffd\ufffd\ufffd Setting of intrusive ullage ALGs Subclause4 – 7.2.2.1\ufffd\ufffd\ufffd Setting of an intrusive ullage ALG (e.g. float- or servo-operated ALG) on… Subclause4 – 7.2.2.2\ufffd\ufffd\ufffd Setting of an intrusive ALG (e.g. float- or servo-operated ALG) with the … Subclause3 – 7.2.3\ufffd\ufffd\ufffd Setting of non-intrusive ALGs Subclause4 – 7.2.3.1\ufffd\ufffd\ufffd Setting of a non-intrusive ALG (e.g. microwave or radar-based ALG) on an … Subclause4 – 7.2.3.2\ufffd\ufffd\ufffd Setting of a non-intrusive ALG (e.g. microwave or radar-based ALG) with t… <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Subclause3 – 7.2.4\ufffd\ufffd\ufffd Other ALGs not described in this part of ISO\ufffd4266 Subclause2 – 7.3\ufffd\ufffd\ufffd Initial field verification Subclause3 – 7.3.1\ufffd\ufffd\ufffd Introduction Subclause3 – 7.3.2\ufffd\ufffd\ufffd Verification procedure Subclause4 – 7.3.2.1\ufffd\ufffd\ufffd Rounding off Subclause4 – 7.3.2.2\ufffd\ufffd\ufffd Procedure Subclause4 – 7.3.2.3\ufffd\ufffd\ufffd Resetting or readjustment of an ALG during initial field verification <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Subclause3 – 7.3.3\ufffd\ufffd\ufffd Tolerance of initial field verification Subclause2 – 7.4\ufffd\ufffd\ufffd Record keeping Clause1 – 8\ufffd\ufffd\ufffd Subsequent verification of ALGs Subclause2 – 8.1\ufffd\ufffd\ufffd General Subclause2 – 8.2\ufffd\ufffd\ufffd Frequency of subsequent verification Subclause2 – 8.3\ufffd\ufffd\ufffd Procedure UntitledSubclause3 – 8.3.1\ufffd\ufffd\ufffd The liquid level at which the ALG is verified in a subsequent verif… UntitledSubclause3 – 8.3.2\ufffd\ufffd\ufffd The subsequent verification can be performed by taking three consec… UntitledSubclause3 – 8.3.3\ufffd\ufffd\ufffd For ALGs in fiscal\/custody transfer applications, the average ALG r… Subclause2 – 8.4\ufffd\ufffd\ufffd Tolerance for subsequent verification of ALGs in fiscal\/custody transfer appl… <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Subclause2 – 8.5\ufffd\ufffd\ufffd Comparison of the ALG readings from current and previous verifications UntitledSubclause3 – 8.5.1\ufffd\ufffd\ufffd For ALGs used in fiscal\/custody transfer application, the average A… UntitledSubclause3 – 8.5.2\ufffd\ufffd\ufffd Compare the average ALG reading from the current verification again… UntitledSubclause3 – 8.5.3\ufffd\ufffd\ufffd Compare the average ALG reading from the current verification again… UntitledSubclause3 – 8.5.4\ufffd\ufffd\ufffd If any of the tolerances described in Subclause2 – 8.6\ufffd\ufffd\ufffd Adjustment in subsequent verification Clause1 – 9\ufffd\ufffd\ufffd Data communication and receiving <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Bibliography – Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Petroleum and liquid petroleum products. Measurement of level and temperature in storage tanks by automatic methods – Measurement of level in pressurized storage tanks (non-refrigerated)<\/b><\/p>\n |