154.810—Vapor line connections.
(a)
A remotely operated cargo vapor shutoff valve must be installed in the vapor collection line between the facility vapor connection and the nearest point where any inerting, enriching, or diluting gas is introduced into the vapor collection line or where a detonation arrester is fitted. The valve must:
(1)
Close within thirty (30) seconds after detection of a shutdown condition by a component required by this subpart;
(5)
Have a local valve position indicator or be designed so that the valve position can be readily determined from the valve handle or valve stem position; and
(6)
If the valve seat is fitted with resilient material, not allow appreciable leakage when the resilient material is damaged or destroyed.
(b)
Except when a vapor collection arm is used, the last 1.0 meter (3.3 feet) of vapor piping before the facility vapor connection must be:
(c)
Each facility vapor connection flange must have a permanently attached 0.5 inch diameter stud at least 1.0 inch long projecting outward from the flange face. The stud must be located at the top of the flange, midway between bolt holes, and in line with the bolt hole pattern.
(i)
A bolt hole arrangement complying with the requirements for 150 pound class ANSI B16.5 (incorporated by reference; see § 154.106) flanges, and
(ii)
One or more 0.625 inch diameter holes in the flange located midway between bolt holes and in line with the bolt hole pattern;
(7)
Have the last 1.0 meter (3.3 feet) of each end of the vapor hose marked in accordance with paragraph (b) of this section.
(e)
Vapor hose handling equipment must be provided with hose saddles which provide adequate support to prevent kinking or collapse of hoses.
(2)
Have the last 1.0 meter (3.3 feet) of the arm marked in accordance with paragraph (b) of this section.
(g)
The facility vapor connection must be electrically insulated from the vessel vapor connection in accordance with section 6.10 of the OCIMF International Safety Guide for Oil Tankers and Terminals (incorporated by reference; see § 154.106 ).
(h)
A vapor collection system fitted with an enriching system that operates at a positive gauge pressure at the facility vapor connection must be fitted with:
(1)
A manual isolation valve between each facility vapor connection and the remotely operated cargo vapor shutoff valve required by paragraph (a) of this section; and