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

Page 13 of 29
B 783
approved standards,
(iv) make provisions for containing any leakage to prevent
contamination of the environment by the product or content of the tank,
(v) be provided with efficient electrical earth connections, having an
electrical resistance value not more than fiveohms when measured by
an earth resistance tester of the Megger or similar type and shall be
inspected at intervals of not more than 12 months,
(vi) be provided with adequate and dedicated fire detection and
suppression system,
(vii) be provided with adequate lightning protective device of the
“Envelope Protection Type” that prevents any direct strike and the
development of primary and secondary charges,
(viii)  be provided with device equipped with multi-point ionizers,
or with any other device of similar protection effectiveness as
recommendation by any other relevant international bodies and
approved by the Authority, and
(ix)  floating roof tank shall be equipped with adequate wind girders.
12.  A manager shall ensure that —
(a)  personnel or contractors do not enter into a confined or semi-confined
space or a hydrocarbon storage tank for inspection or maintenance, except
that the —
(i) confined or semi-confined space or a hydrocarbon storage tank is
certified safe, continuously ventilated and tested to safe levels of
hydrocarbon and harmful gases,
(ii) person has undergone appropriate training and risk assessment
for that purpose, and
(iii)  person shall enter with adequate and proper PPE including
breathing apparatus ;
(b) during storage tank cleaning operations —
(i) manned entry is completely prohibited, and appropriate and acceptable
automated or mechanical technologies approved by the Authority shall be
employed, and
(ii) if the gas concentration in a storage tank exceeds 5% of LEL, the
tools used shall not be capable of causing sparks, and all equipment used
shall be certified Flame Proof Group II, in conformity with recognised
international standards ;
(c) storage tanks shall be opened for internal inspection at intervals of
not more than 60 calendar months ;
(d)  during an inspection —
(i) the tank shall be subjected to thorough visual and non-destructive
tests,
Confined
space and
tank
integrity
management