Library / B 771 Federal Republic of Nigeria Official Gazette No. 106
B 771 Federal Republic of Nigeria Official Gazette No. 106

Page 12 of 29
B  782
(bb) safety valves shall be stamped or tagged at its popping-pressures,
and where appropriate, bursting discs of equivalent rating may be used in
lieu of safety valve ;
(cc) pressure vessel shall be tested with a calibrated pressure gauge
which shall be —
(i)  graduated in pounds per square inch or the metric equivalent, and
(ii)  checked for accuracy at intervals not more than 12 months ;
(ee) calibration of pressure relief valves, process safety valves, pressure
gauges and other process safety equipment shall be certified by accredited
persons ;
(ff )  new, repaired, or modified pipework shall be tested in accordance
with the American Society of Mechanical Engineers (ASME) working
standards or recognised equivalent standards to 1.25 times the maximum
allowable working pressure before being put into service ;
(gg) pressure vessel, equipment and associated piping used in midstream
and downstream petroleum operations shall meet internationally recognised
standards for monitoring and controlling corrosion, with respect to the design,
construction, routine inspection, testing and maintenance ;
(hh) the following measures shall, in addition to the respective
manufacturer’s recommended procedures, be taken in relation to every
pressure vessel, equipment and associated piping used in midstream and
downstream petroleum operations, that is—
(i) non-destructive testing, including UTM, shall be carried out at
intervals not more than once in three years to check the rate of both
internal and external corrosion and erosion,
(ii) when corrosion coupons are used for monitoring the corrosion
rate in a pressure vessel, equipment or piping, the results obtained at any
given time shall be recorded and be made available to the Authority on
demand, and
(iii) when cathodic protection system is chosen for the control of
vessel internal corrosion, an appropriate design of the system shall be
made to meet internationally recognised standards ;
(ii) result of the inspection, test and survey carried out under this regulation
shall be made available to the Authority on demand ;
(jj) permanently placed bulk storage tank containing petroleum liquids
shall —
(i) be installed within a bund wall capable of containing the contents
of the largest tank plus 10% of the volume of the remaining tanks within
the enclosure,
(ii) be fitted with access ways sufficiently large to allow easy access,
and vents capable of relieving any excess pressure or vacuum,
(iii) have access to its roof by means of a ladder or staircase of