MERCER VALVE COMPANY, INC.
9100 SERIES DIRECT SPRING OPERATED PRESSURE RELIEF VALVE
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
MERCER VALVE CO., INC. RESERVES THE RIGHT TO CHANGE
PRODUCT DESIGNS AND SPECIFICATIONS WITHOUT NOTICE.
Rev.: J
Date: 23-July-2020
ECN: 3152 Page | 4
1. Scope
This document is used for the installation, operation, and maintenance of a Mercer Valve Co., Inc.
9100 Series pressure relief valve. This document should be read and understood before the valve
is installed, put into service, or maintained. Failure to do so can result in improper operation that
could result in damage to equipment or affect the safety of individuals around the equipment. The
recommendations in this document should be used in conjunction with all regulatory bodies and
all end-user company policies.
Proper safety precautions must be followed during all procedures indicated in this document. This
document does not cover these precautions or the required safety equipment.
Additional information on installation, operation, and maintenance can be found in the following
specifications. These specifications should be used in addition to this document but are not limited
by it.
American Petroleum Institute:
API 510 – Pressure Vessel Inspection Code
API RP 520 Parts I & II – Sizing, Selection, and Installation of Pressure-Relieving Devices in
Refineries
API RP 521 – Guide for Pressure-Relieving and Depressuring Systems
API STD 526 – Flanged Steel Pressure Relief Valves
API STD 527 – Seat Tightness of Pressure Relief Valves
API RP 576 – Inspection of Pressure-Relieving Devices
API STD 598 – Valve Inspection and Testing
American Society of Mechanical Engineers:
ASME PTC 25 – Pressure Relief Devices
ASME Boiler and Pressure Vessel Code Section VIII, Division 1 – Unfired Pressure Vessels
ASME B16.5 – Pipe Flanges and Flanged Fittings
National Board of Boiler Inspectors:
NB-18 – Pressure Relief Valve Certifications
NB-23 – National Board Inspection Code
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