It merged horizontal and vertical clamp machine requirements into a single standard. Safety Devices:

The ASME B151.1 standard is intended for:

ASME B151.1 is a standard published by the American Society of Mechanical Engineers (ASME) that covers safety requirements for hydraulic power pumps and motor-driven pump units. The standard provides guidelines for the design, manufacture, testing, and documentation of pumps and pump units used in various industries.

The query can refer to two different technical standards depending on your industry. Please clarify which of the following you are looking for: