This advance notice of proposed rulemaking invites comments on means to reduce the potential for accidents on pipelines used in interstate and foreign commerce to transport highly volatile liquids (HVL). These means are: (1) Make line pipe easier to weld and with tougher longitudina'seams, (2) add water to -anhydrous ammonia to inhibit stress corrosion cracking, (3) use lower design and operational stress levels in accordance with population density, and (4) conduct periodic hydrostatic tests. Accident report statistics indicate that pipelines transporting highly volatile liquids have cased a substantially higher percentage of  deaths, injuries, and property damage than liquid pipelines transporting less volatile commodities. Materials Transportation Bureau (IVITB) expects that each of the proposed means wouldreduce the potential for accidents in HVL pipelines.