Installation, Operation & Maintenance Manual
8
External-Style Pressure Relief Valve A-1402C Series
1.3 PRE-INSTALLATION REGULATIONS / REQUIREMENTS
1.3.1
Regulations
Midland External-Style Valves are used in contact with a variety of products, many of which are
hazardous materials. The acceptance and transportation of products are regulated by the DOT and AAR in the U.S.A.,
and in Canada by CTC and Transport Canada. Regulations of other governmental bodies must be complied with
for stationary and mobile applications. All personnel should be familiar with and follow these regulations. Nothing
in these instructions is intended to conflict with or supersede these regulations. The information in this document
was gathered from knowledgeable sources, but Midland Manufacturing Corporation makes no representations or
guarantees about its accuracy or completeness and assumes no liability for this information.
Specifications are subject to change without notice.
1.3.2
Safety Precautions
Midland valves are used in connection with a variety of products, many of which are hazardous
materials and could cause serious injury or damage.
This valve should only be installed, operated and maintained by qualified personnel.
Read all of these instructions carefully before proceeding.
1.3.3
Precautions for Mounted-Valve Repair
When performing maintenance on a pressure relief valve that is
mounted on a railcar, observe the following precautions.
• Wear protective clothing and equipment suitable for withstanding the materials to which you may be exposed
• Position yourself on the upwind side of the valve when possible
• Work with a partner who can help you in the event of an emergency
• Follow approved safety precautions for hazardous or toxic materials
CAUTION: Toxic Hazard.
Always use extreme caution and proper equipment when involved with hazardous
materials. To avoid exposure to toxic or hazardous materials, make sure the tank car is empty and clean, and that
the work area is free of hazardous chemicals before removing or installing any valve.
WARNING:
These external-style pressure relief valves are spring-loaded assemblies with a large amount of
stored potential energy in the spring. Handle with care to avoid damage to the valve stem, which could result in
breakage and ejected piece parts.
WARNING:
When assembling or disassembling the valve, DO NOT position oneself directly in front of the spring
and stem. Instead, position oneself to the side away from the valve. Unexpected component failure – valve-stem
or spring breakage – may cause a sudden energy release that can discharge component parts a short distance in
an uncontrolled manner. Personal injury may be a result.
CAUTION
WARNING
WARNING
