229 Neb. Admin. Code, ch. 4, § 005
The discharge from safety valves, safety relief valves, blowoff pipes and other hazardous fluid outlets shall be so arranged that there will be no danger of injury to personnel. When the safety valve or temperature/pressure relief valve discharge is piped away from the boiler to the point of discharge, there shall be provisions made for properly draining the piping. The size and arrangement of discharge piping shall be such that any pressure that may exist or develop, will not reduce the relieving capacity of the relieving devices below that capacity required to protect the boiler or pressure vessel. Manifolding of discharges from multiple boilers or pressure vessels having different maximum allowable working pressures is not permitted unless verification, including design calculations and component specification, have been approved in advance by the person or entity who will perform the hydrostatic test and certification required in 229 NAC 2, §007. All safety or safety relief valves or pressure relief devices shall have a discharge pipe installed and is directed to a floor drain or other suitable and safe point of discharge. Such discharge piping shall be made of a metal or metal alloy that is capable of withstanding the forces, pressure, and temperature that exist when the valve to which it is attached is in operation.
229 Neb. Admin. Code, ch. 4, § 005