Hose failures during the unloading/loading of HAZMATS are still causing many problems for far too many businesses. We have discussed the process side and the DOT container site engineering requirement for when the hose fails. This post is a list of requirements that we should be incorporating into our HAZMAT safety programs regarding the use of hoses.
Each hose assembly used for transferring hazardous material must meet the following requirements:
(a) The minimum design burst pressure for each hose assembly must be at least four (4) times the sum of the pressure of the relief valve setting (or four (4) times the maximum pump pressure when no relief valve is installed) plus the static head pressure of the transfer system, at the point where the hose is installed.
(b) The maximum allowable working pressure (MAWP) for each hose assembly must be more than the sum of the pressure of the relief valve setting (or the maximum pump pressure when no relief valve is installed) plus the static head pressure of the transfer system, at the point where the hose is installed.
(c) Each nonmetallic hose must be usable for oil or hazardous material service.
(d) Each hose assembly must either have—
(1) Full threaded connections;
(2) Flanges that meet ANSI B16.5 or ANSI B16.24; or
(3) Quick-disconnect couplings that meet ASTM F1122.
(e) Each hose must be marked with one of the following:
(1) The name of each product for which the hose may be used; or
(2) For oil products, the words “OIL SERVICE”; or
(3) For hazardous materials, the words “HAZMAT SERVICE—SEE LIST” followed immediately by a letter, number or other symbol that corresponds to a list or chart contained in the facility’s operations manual or the vessel’s transfer procedure documents which identifies the products that may be transferred through a hose bearing that symbol.
(f) Each hose also must be marked with the following:
(1) Maximum allowable working pressure;
(2) Date of manufacture; and
(3) Date of the latest test.
(g) The hose burst pressure and the pressure used for the test must not be marked on the hose and must be recorded elsewhere at the facility.