1. SCOPE
……………………………………………………
2. REFERENCES
3. GENERAL
4. ADDITIONAL MATERIAL REQUIREMENTS
1. Scope
1.1 This specification is to assist the user in the application and adaption of the check valves described in
PIP PNSMV005. The valves are of impact tested, killed, or plain carbon steel, with bolted or pressure seal
bonnet, flanged (raised faced) or welding ended (butt or socket), wafer type or swing, and are of dual plate
or piston construction. Nominal pipe sizes NPS 1
/2 to 24 for Classes 150 to 1500 are covered.
1.2 This specification shall be used in conjunction with SES P18-G01.
1.3 This specification is one of a four part series for check valves, each of which represents a group of like
materials, see 3.2.
2. References
Reference is made in this specification to the following documents. The latest issues, amendments, and
supplements to these documents shall apply unless otherwise indicated.
SABIC Engineering Standards (SES)
P02-S01 Piping Materials Standards Specification-Part 1, Group 1
P18-G01 Design Limitations and Applications of Valves
P21-S02 Low and Intermediate Alloy Steel Check Valves – Materials and Services
P21-S03 Stainless Steel Check Valves – Materials and Services
P21-X01 Check Valve Data Sheet
American Society for Testing and Materials (ASTM)
A 193 Alloy-Steel and Stainless Steel Bolting Materials for High Temperature Service
National Association of Corrosion Engineers (NACE)
MR0175 Standard Material Requirements – Sulfide Stress Cracking
Process Industry Practices (PIP)
PNSMV005 Carbon Steel – Check Valve Descriptions
PNSMV015 Low and Intermediate Alloy Steel – Check Valve Descriptions
PNSMV025 Stainless Steel – Check Valve Descriptions
PNSMV035 Bronze and Iron – Check Valve Descriptions
3. General
3.1 The carbon steel check valves described in PIP PNSMV005 and this specification shall be used in
general process services, which shall include but not be limited to general hydrocarbons, steam,
condensate, air, boiler feed water, low temperature hydrocarbons (NGL, LPG), dry hydrogen, naphtha,
amines (DGA, DEA, MEA, SOLFINOL, and CATACARB), amino diisopropanol (ADIP), flare lines and dry
carbon dioxide.
3.2 The other specifications in this series are:
a. SES P21-S02, which covers low and intermediate alloy steel check valves described in
PIP PNSMV015, and used in general process services
b. SES P21-S03, which covers stainless steel check valves described in PIP PNSMV025, and
used in corrosive services
c. Check valves described in PIP PNSMV035, and used in utility services
3.3 Valves in new piping systems shall conform to PIP PNSMV005 and this specification. Valves for
maintaining or tie-in to existing systems may be in accordance with original specifications.
3.4 PIP PNSMV005 describes the valves, their components, and their materials of construction. The trim
for check valves comprises the body and plate seating surfaces, spring, hinge, bearings, and small
internal parts that contact the service fluid.
3.5 The valves have unique valve number designations, for example CH-102, by which they are referred to
in the PIP line classes. See PIP PNSMV005 Section 6 for applicable line classes.
3.6 All design, material, service, inspection, marking, documentation, shipping and other requirements
shall be specified on the data sheet SES P21-X01. This shall be attached to the requisition/purchase order.
4. Additional Material Requirements
For services where the materials specified in PIP PNSMV005 are inadequate, the following requirements
shall be met:
4.1 Materials shall be suitable for continuous exposure at the service conditions and ratings specified.
4.2 Valve components in rubbing or sliding contact shall not gall.
4.3 The corrosion resistance of body-to-cover joint bolting and gasket material shall be at least equal to the
material of the body and bonnet. However, the bolting material is not required to be more corrosion
resistant than austenitic stainless AISI type 304 (in accordance with ASTM A 193) unless otherwise
specified in the purchase order.
4.4 For low temperature services between -20 °C and -45 °C, all non-metallic seats, seals and packing
shall retain adequate resilience after prolonged and cyclic loading. Impact resistance of carbon steel shall
conform to the requirements of SES P02-S01.
4.5 Cyanides, acids, acid salts and wet H2S, or sour service promote sulfide (stress corrosion) cracking.
This situation shall be mitigated by maintaining maximum ductility in the valve parts. Maximum hardness
limits shall be as specified in NACE MR0175. Body-to-cover bolting shall be in accordance with
NACE MR0175 Class III. However, when the valve is to be insulated, or buried, it shall be in accordance
with NACE MR0175 Class I or II. Weldments shall be stress relieved in accordance with NACE sections 3
and 4.
4.6 The packing material shall be chemically compatible with the fluid, and have sufficient sealing
properties at the temperature of operation. Packing shall be asbestos-free, and corrosion inhibited, to avoid
stem pitting. In hydrocarbon services, packing and stem seals shall not be pure polymer/elastomer unless
the valves have been qualified as fire safe.