Low and Intermediate Alloy Steel Globe Valves – Materials and Services

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 globe valves described in
PIP PNSMV014. The valves are of low and intermediate alloy steel, with bolted or pressure seal bonnet,
flanged (raised faced) or welding ended (butt or socket), and are of T-body and outside screw and yoke
(OS&Y) 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 globe 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)
P18-G01 Design Limitations and Applications of Valves
P20-S01 Carbon Steel Globe Valves – Materials and Services
P20-S03 Stainless Steel Globe Valves – Materials and Services
P20-X01 Globe Valve Data Sheet
American Society of Mechanical Engineers (ASME)
Boiler and Pressure Vessel Code – Section I
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)
PNSMV004 Carbon Steel – Globe Valve Descriptions
PNSMV014 Low and Intermediate Alloy Steel – Globe Valve Descriptions
PNSMV024 Stainless Steel – Globe Valve Descriptions
PNSMV034 Bronze and Iron – Globe Valve Descriptions
3. General
3.1 The low and intermediate alloy steel globe valves described in PIP PNSMV014 and this specification
shall be used in general process services, which shall include but not be limited to general hydrocarbons,
super heated steam (ASME Section I), high pressure condensate, boiler feed water, reformed gas,
process gas, natural gas, synthesis gas, hydrogen rich hydrocarbons, hydrogen, ammonia, and caustic
wash. These low and intermediate alloy steel globe valves contain 1 to 9 chromium plus various amounts
of molybdenum.
3.2 The other specifications in this series are:
a. SES P20-S01, which covers carbon steel globe valves described in PIP PNSMV004, and used
in general process services
b. SES P20-S03, which covers stainless steel globe valves described in PIP PNSMV024, and used
in corrosive services
c. Globe valves described in PIP PNSMV034, and used in utility services

3.3 Valves in new piping systems shall conform to PIP PNSMV014 and this specification. Valves for
maintaining or tie-in to existing systems may be in accordance with original specifications.
3.4 PIP PNSMV014 describes the valves, their components, and their materials of construction. The trim
for globe valves comprises the stem, body and globe seating surfaces, the metal seat rings, back seat
bushing and small internal parts that contact the service fluid.
3.5 The valves have unique valve number designations, for example GL-150, by which they are referred to
in the PIP line classes. See PIP PNSMV014 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 P20-X01. This shall be attached to the requisition/purchase order.
4. Additional Material Requirements
For services where the materials specified in PIP PNSMV014 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-bonnet and packing gland bolting, and ring joint gasket material shall
be at least equal to the material of the body, bonnet and yoke. 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 Chrome molybdenum materials, 2
/4 Cr-1Mo in particular, tend to degrade when subjected to
repeated weldings and subsequent stress reliefs. This shall be mitigated either by metallurgical control or
by step cooling. A third alternative shall be to limit the number of heat treatments, to limit the total
tempering.
1
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-bonnet 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.
4.7 The identification plate material shall be austenitic stainless steel or nickel alloy.

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