Clamp Ring Closure The Clamp Ring Closure
provides a quick opening
access point to pipelines
or pressure vessels, for the
installation / removal of
equipment.
The clamp ring closure is
designed in accordance
with ASME VIII Divison 1,
ASME B31.4 (Oil & Liquid
Products Code) & ASME B31.8
(Gas Pipeline Code).
The design consists of six
main components:
Hub (Pressure Retaining)
Door (Pressure Retaining)
Clamp (Pressure Retaining)
2 x vent/bleeder screws
(Pressure Retaining)
2 x operating screws
O-Ring seal (Pressure Retaining)
Features of the Clamp Ring Closure:Range from 4"ns up to to 48"ns
ANSI Class rating up to ANSI Class 600
Standard wall thickness range dependent upon ANSI Class rating
Dual pressure alert vent/bleeder system
Meets code requirements of external, visible pressure warning device
Operating screws manufactured from stainless steel 316, for corrosion resistance
Screw inserts manufactured from carbon steel & xylan coated for corrosion resistance
Temperature range up to 392°F (200°C)
Pressure retaining parts in accordance with NACE MR0175
O-Ring seal easily replaced
Suitable for both left and right hand orientation
Clamp Ring Closure in locked and unlocked positions
Clamp Ring Closure with Drive Mechanism (Shown Translucent for Clarity) In locked and unlocked positions
Optional Features:
Additional material testing on pressure retaining components upon request (UT, HIC, SSC)
Fully enclosed drive mechanism, housed within a sheet metal casing offering protection of moving parts
– Operates both operating screws simultaneously to open clamp using a single handle
– Can be retro-fitted onto existing clamp ring closure
Flange Mounted Clamp Ring Closure: 37 [XX] [X] – [X] [X] [X] [X] Clamp Ring Closure: 38 [XX] [X] – [X] [X] [X] [X]
O-Ring MaterialMaterial Certification Level
Forging MaterialASME Certification
ANSI Class Rating/WTNominal Size
Clamp Ring Closure Product Codes The nine digit product code (defined as a five digit prefix and a four digit suffix) allows for multiple Clamp Ring Closure configurations to be easily defined covering a wide range of operational and service requirements.
Clamp Ring Closure Drive Mechanism: 38100 – [XXXX]
Nominal Size
Clamp Ring Closure Drive Mechanism Product Codes The nine digit product code (defined as a five digit prefix and a four digit suffix) defines the relevant drive mechanism to be specified for a particular Clamp Ring Closure Size.
Prefix 5 Digit Code:Description:
38100 = Clamp Ring Closure Drive Mechanism
Suffix 4 Digit CodeClosure Nominal Size:
0004 = 4"ns 0016 = 16"ns 0028 = 28"ns 0040 = 40"ns
0006 = 6"ns 0018 = 18"ns 0030 = 30"ns 0042 = 42"ns
0008 = 8"ns 0020 = 20"ns 0032 = 32"ns 0044 = 44"ns
0010 = 10"ns 0022 = 22"ns 0034 = 34"ns 0046 = 46"ns
0012 = 12"ns 0024 = 24"ns 0036 = 36"ns 0048 = 48"ns
0014 = 14"ns 0026 = 26"ns 0038 = 38"ns
Example: Clamp Ring Closure Drive Mechanism Definition:
Clamp Ring Closure Drive Mechanism
16"ns Nominal Size
Clamp Ring Closure Example: 38163-0111
Example: Clamp Ring Closure Definition:
Clamp Ring Closure
16"ns Nominal Size
ANSI CL600 (0.656in / 16.7mm Wall Thickness)
ASME Certification Not Applicable
ASTM A105 / A350 LF2 Material (Pressure Retaining Parts)
EN 10204 3.1 Certs
FKM O-ring seal material
Clamp Ring Closure Drive Mechanism
Example: 38100-0016
Prefix 5 Digit Code:Closure Type:
37 = Flange Mounted Clamp Ring Closure
38 = Clamp Ring Closure
Closure Nominal Size:
04 = 4"ns 16 = 16"ns 28 = 28"ns 40 = 40"ns
06 = 6"ns 18 = 18"ns 30 = 30"ns 42 = 42"ns
08 = 8"ns 20 = 20"ns 32 = 32"ns 44 = 44"ns
10 = 10"ns 22 = 22"ns 34 = 34"ns 46 = 46"ns
12 = 12"ns 24 = 24"ns 36 = 36"ns 48 = 48"ns
14 = 14"ns 26 = 26"ns 38 = 38"ns
Flange Mounted Class / WT: (37 Family Group)
1 = ANSI CL15O RF Flange & Corresponding Minimum W/T
2 = ANSI CL300 RF Flange & Corresponding Minimum W/T
3 = ANSI CL600 RF Flange & Corresponding Minimum W/T
4 = ANSI CL900/1500 RF Flange & Corresponding Minimum W/T
5 = ANSI CL15O RTJ Flange & Corresponding Minimum W/T
6 = ANSI CL300 RTJ Flange & Corresponding Minimum W/T
7 = ANSI CL600 RTJ Flange & Corresponding Minimum W/T
8 = ANSI CL900/1500 RTJ Flange & Corresponding Minimum W/T
Class / WT: (38 Family Group)
1 = ANSI CL150 & Corresponding Minimum W/T
2 = ANSI CL300 & Corresponding Minimum W/T
3 = ANSI CL600 & Corresponding Minimum W/T
C = Client Specific W/T
Suffix 4 Digit CodeASME Certification:
0 = Not Applicable (Designed Generally In Accordance With ASME VIII Division
1, U Designator Not Applied To Equipment)
1 = ASME Certified With ‘U’ Designator
Pressure Part Material: Please note that other materials are available upon request.
1 = ASTM A105 / ASTM A350 LF2 (Dual Certified)
2 = ASTM A694 F52 4 = ASTM A694 F65
3 = ASTM A694 F60 5 = ASTM A694 F70
6 = ASME SA105
(Applicable for ASME Certified with ‘U’ Designator Closures Only)
7 = ASME SA350 LF2
(Applicable for ASME Certified with ‘U’ Designator Closures Only)
Material Certification Level:
1 = EN 10204 3.1 2 = EN 10204 3.2
O-Ring Material: Please note that other materials are available upon request.
1 = FKM 2 = FFKM 3 = NBR 4 = HNBR