Viega Megapress User manual

Installation Manual
Viega MegaPress® Stainless Systems

3 of 45IM-MP 591324 0120 MegaPress Stainless
Table of Contents
Table of Contents
1 About this Document ______________________________________ 6
1.1 Disclaimer ____________________________________________ 6
1.2 Symbols Used _________________________________________ 7
1.3 Audience _____________________________________________ 7
1.4 About this Version ______________________________________ 7
2 Product Information _______________________________________ 8
2.1 MegaPress Stainless Systems ____________________________ 8
2.2 Safety ________________________________________________ 8
2.3 Areas of Use __________________________________________ 8
2.3.1 MegaPress 304 FKM and 316 FKM ________________ 9
2.3.2 MegaPress 316 ________________________________ 10
2.3.3 Fire Protection Systems _________________________ 11
2.3.4 Design Services ________________________________ 11
2.4 Standards and Regulations _____________________________ 12
2.4.1 Overview ______________________________________ 12
2.4.2 Regulations: Applications ________________________ 12
2.4.3 Standards: Pipes _______________________________ 12
2.4.4 Standards: Sealing Elements _____________________ 12
2.4.5 Standards: Pipe Hangers ________________________ 12
2.4.6 Standards: Pressure Testing _____________________ 13
2.5 Listings and Certi󶈵cations ______________________________ 13
2.5.1 MegaPress 304 FKM ___________________________ 13
2.5.2 MegaPress 316 ________________________________ 13
2.5.3 MegaPress 316 FKM ___________________________ 14
2.6 Codes and Standards _________________________________ 15
2.6.1 MegaPress 304 FKM ___________________________ 15
2.6.2 MegaPress 316 ________________________________ 15
2.6.3 MegaPress 316 FKM ___________________________ 15
2.7 Product Description ___________________________________ 16
2.7.1 Overview ______________________________________ 16
2.7.2 Pipes _________________________________________ 16
2.7.2.1 Schedule 5 Pipe _________________________ 16
2.7.2.2 Schedule 10 Pipe ________________________ 17
2.7.2.3 Schedule 40 Pipe ________________________ 17
2.7.3 Viega MegaPress Stainless Pipe Marking Guide _____ 18
2.7.4 Press Fittings __________________________________ 19
2.7.4.1 Viega MegaPress Stainless ½" to 2" Fittings _ 19
2.7.4.2 Viega MegaPress Stainless 2½" to 4" Fittings 19
2.7.4.3 FKM Sealing Element ____________________ 19
2.7.4.4 EPDM Sealing Element ___________________ 20
2.7.4.5 Fitting Markings _________________________ 20
2.7.4.6 Viega Smart Connect Technology __________ 21

4 of 45 IM-MP 591324 0120 MegaPress Stainless
Table of Contents
2.8 General Installation Requirements ________________________ 21
2.8.1 Required Tools _________________________________ 21
2.8.2 Expansion _____________________________________ 22
2.8.3 Exposure to Freezing Temperatures _______________ 22
2.8.4 Underground Installations ________________________ 22
2.8.5 Concealed Spaces _____________________________ 22
2.8.6 Electrical Bonding ______________________________ 23
2.8.7 Corrosion Protection ____________________________ 23
2.8.8 De󶈶ection _____________________________________ 24
2.8.8.1 Controlling De󶈶ection ____________________ 24
3 Handling Instructions _____________________________________ 26
3.1 Transport ____________________________________________ 26
3.2 Storage ______________________________________________ 26
3.3 Pipe Preparation ______________________________________ 26
4 Installation Instructions ___________________________________ 27
4.1 Check System Components ____________________________ 27
4.2 Installing and Mounting the Pipe _________________________ 27
4.2.1 Pipe Hangers and Supports ______________________ 27
4.2.2 Transition Fittings _______________________________ 28
4.2.2.1 Threaded Connections ___________________ 28
4.2.2.2 Flange Connections ______________________ 28
4.2.3 No-Stop Couplings _____________________________ 29
4.3 Space Requirements and Intervals _______________________ 29
4.3.1 Minimum Distance Between Fittings _______________ 30
4.3.2 Minimum Space Requirements ___________________ 30
4.3.3 MegaPress Jaws Clearance Requirements _________ 31
4.3.4 MegaPress Rings Clearance Requirements _________ 32
4.3.5 Pressing with Ring and Actuator in Tight Quarters ___ 33
4.4 Welding _____________________________________________ 34
4.4.1 Welding Adjacent to a Fitting _____________________ 34
4.4.2 Welding In Line with a Fitting _____________________ 34
4.4.3 Welding Requirements __________________________ 34
4.5 Cutting the Pipe ______________________________________ 34
4.6 Deburring the Pipe ____________________________________ 35
4.7 Pressing the Fitting ____________________________________ 35
4.7.1 Viega MegaPress Stainless ½" to 2" Installation _____ 36
4.7.2 Viega MegaPress Stainless 2½" to 4" Installation ____ 39
4.8 Pressure Testing ______________________________________ 42
4.9 Disposal _____________________________________________ 42
5 Limited Warranty _________________________________________ 43
5.1 Limited Warranty for Viega Metal Systems for Industrial
Applications __________________________________________ 43

5 of 45IM-MP 591324 0120 MegaPress Stainless
Table of Contents
List of Tables
Table 1 Fluids and water approved for use with MegaPress 304 and
316 FKM systems _____________________________________ 9
Table 2 Fuel, oil, and lubricant approved for use with MegaPress 304
and 316 FKM systems __________________________________ 9
Table 3 Gases approved for use with MegaPress 304 and 316 FKM
systems ______________________________________________ 9
Table 4 Fluids and water approved for use with MegaPress 316
systems _____________________________________________ 10
Table 5 Fuel, oil, and lubricant approved for use with MegaPress 316
systems _____________________________________________ 10
Table 6 Gases approved for use with MegaPress 316 systems _____ 10
Table 7 Applications Regulations _______________________________ 12
Table 8 Pipes Standards ______________________________________ 12
Table 9 Sealing Elements Standards ____________________________ 12
Table 10 Mounting Standards __________________________________ 12
Table 11 Pressure Testing Standards ____________________________ 13
Table 12 Schedule 5 Pipe Sizing ________________________________ 16
Table 13 Schedule 10 Pipe Sizing _______________________________ 17
Table 14 Schedule 40 Pipe Sizing _______________________________ 17
Table 15 Guide to the ASNI A13.1 standard for the identi󶈵cation of
pipes _______________________________________________ 18
Table 16 Pipe markers _________________________________________ 18
Table 17 Press Tools __________________________________________ 21
Table 18 Pipe hanger spacing __________________________________ 28
Table 19 Insertion depths for MegaPress no-stop couplings _________ 29
Table 20 Minimum distance between press 󶈵ttings _________________ 30
Table 21 MegaPress distance requirements for press jaws between
pipes and walls _______________________________________ 30
Table 22 MegaPress standard jaws clearance requirements _________ 31
Table 23 MegaPress compact jaws clearance requirements _________ 31
Table 24 MegaPress standard jaws clearance requirements between
pipe, wall, and 󶈶oor ___________________________________ 31
Table 25 MegaPress compact jaws clearance requirements between
pipe, wall, and 󶈶oor ___________________________________ 31
Table 26 MegaPress rings dimensions ___________________________ 32
Table 27 MegaPress rings with V2/V3 actuator clearance requirements 32
Table 28 MegaPress rings with V2/V3 actuator clearance requirements
between pipe, wall, and 󶈶oor ___________________________ 32
Table 29 Minimum insertion depths MegaPress Stainless ½" to 2" ____ 36
Table 30 Minimum insertion depths MegaPress Stainless 2½" to 4" ___ 40

About this Document
6 of 45 IM-MP 591324 0120 MegaPress Stainless
1 About this Document
1.1 Disclaimer
Viega products are designed to be installed by licensed and
trained plumbing and mechanical professionals who are
familiar with Viega products and their installation. Installation
by non-professionals may void Viega LLC’s warranty.
This document is subject to updates. For the most current
Viega technical literature please visit www.viega.us.
MegaPress 304 FKM ½" to 2" formerly MegaPress Stainless 304
MegaPress 304 FKM 2½" to 4" formerly MegaPress Stainless 304 XL
MegaPress 316 ½" to 2" formerly MegaPress Stainless 316
MegaPress 316 2½" to 4" formerly MegaPress Stainless 316 XL

About this Document
7 of 45
IM-MP 591324 0120 MegaPress Stainless
DANGER!
This symbol warns of possible life-threatening injury.
WARNING!
This symbol warns of possible serious injury.
CAUTION!
This symbol warns of possible injury.
NOTICE!
This symbol warns of possible damage to property.
Notes give additional helpful tips.
1.2 Symbols Used
The following symbols may be used within this document:
The information in this manual is directed at plumbing and mechanical professionals
and trained personnel. Individuals without the above-mentioned training or
quali󶈵cation are not permitted to mount, install and, if required, maintain this product.
1.3 Audience
1.4 About this Version
This installation manual contains important information about the choice
of product or system, assembly, and commissioning as well as intended
use and, if required, maintenance measures. The information about the
products, their properties, and application technology are based on the
current standards in the United States and Canada.
Some passages in the text may refer to technical codes in the United
States and Canada. These should serve as recommendations in the
absence of corresponding national regulations. The information herein
is not binding for other countries and regions; and as mentioned above,
should be understood as a recommendation.

Product Information
8 of 45 IM-MP 591324 0120 MegaPress Stainless
Please read and understand the instructions before beginning installation
to eliminate safety concerns and reduce risks associated with use and
handling of Viega products.
The Viega MegaPress stainless steel 󶈵ttings are available in both 304 and
316 alloys and are for use with IPS schedule 5 to schedule 40 stainless
steel pipe in ½" to 2" and schedule 10 to schedule 40 stainless steel pipe
in 2½" to 4" sizes. These stainless steel 󶈵ttings are suitable for a broad
range of industrial uses, including fuel oils, acids, complex chemicals and
inert gases.
Viega MegaPress 304 FKM 󶈵ttings and valve ends are constructed of 304
stainless steel while MegaPress 316 and 316 FKM 󶈵ttings and valve ends are
constructed of 316L stainless steel. Both range from ½ inch to 4 inches.
MegaPress 304 FKM 󶈵ttings feature a white dot with an FKM sealing
element, MegaPress 316 󶈵ttings have a green dot with an EPDM sealing
element, and MegaPress 316 FKM 󶈵ttings have a white dot with an
FKM sealing element. All use Viega’s unique, patented Smart Connect
technology to help installers ensure that they have pressed all connections.
The Viega MegaPress Stainless 󶈵tting system requires no welding,
soldering, brazing, or threading and poses no 󶈵re hazard, which is
particularly important in restoration or retro󶈵t work. The 󶈵ttings are installed
with electro-hydraulic press tools (battery-powered or corded press tools).
2 Product Information
2.1 MegaPress Stainless Systems
2.2 Safety
2.3 Areas of Use
The system is intended for use in both commercial and industrial
applications and is a replacement for welded, threaded, and rolled-groove
connection in new installations and repairs. Only MegaPress 316 with
an EPDM sealing element is approved for potable water. MegaPress
Stainless 󶈵ttings are not approved for use in fuel gas installations.

Product Information
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IM-MP 591324 0120 MegaPress Stainless
2.3.1 MegaPress 304 FKM and 316 FKM
Type of Service Comments Pressure Temperature
Fire sprinklers NFPA 13, 13D, 13R 175 psi Ambient
Chilled water Ethylene glycol /
propylene glycol 200 psi Down to 14°F
Hydronic heating Ethylene glycol /
propylene glycol 200 psi 14° to 284°F
Cooling water Up to 50% ethylene
glycol or propylene glycol
solution
200 psi 14° to 284°F
Low-pressure steam Max 15 psi Max 250°F
Isopropyl Alcohol 200 psi Ambient
Nitric Acid 10% 200 psi Ambient
Para󶈷n Wax 200 psi Max 100˚F
Table 1: Fluids and water approved for use with MegaPress 304 and 316 FKM systems
Type of Service Comments Pressure Temperature
Heating Fuel Oil 125 psi Max 100˚F
Diesel Fuel 125 psi Max 100˚F
Kerosene 125 psi Max 68˚F
Lube Oil Petroleum Based 200 psi Max 150˚F
Mineral Oil 200 psi Ambient
Table 2: Fuel, oil, and lubricant approved for use with MegaPress 304 and 316 FKM systems
Type of Service Comments Pressure Temperature
Compressed air Oil concentrate
< 25 mg/m3200 psi Max 140˚F
Compressed air Oil concentrate
> 25 mg/m3200 psi Max 140˚F
Oxygen - O2 (nonmedical) Keep oil and fat free
/ non-liquid O2
140 psi Max 140˚F
Nitrogen - N2200 psi Max 140˚F
Acetylene 20 psi Ambient
Argon Welding use 200 psi Max 140˚F
Vacuum 29.2" of Hg 0° to 160˚F
Table 3: Gases approved for use with MegaPress 304 and 316 FKM systems

Product Information
10 of 45 IM-MP 591324 0120 MegaPress Stainless
It is recommended that all systems be clearly labeled with the 󶈶uid or gas
being conveyed. In the absence of local requirements, systems should be
identi󶈵ed in accordance with ANSI/ASME A13.1.
The use of the system for applications other than those
listed or outside of these parameters must be approved by
the Viega Technical Services Department.
2.3.2 MegaPress 316
Type of Service Comments Pressure Temperature
Hot and Cold Potable Water 200 psi 32˚F to 250˚F
Rainwater/Gray Water 200 psi Ambient
Chilled water Ethylene glycol /
propylene glycol 200 psi Down to 0°F
Hydronic heating Ethylene glycol /
propylene glycol 200 psi 0° to 250°F
Cooling water Up to 50% ethylene
glycol or propylene
glycol solution
200 psi 0° to 250°F
Deionized Water 200 psi Max 230°F
Low-pressure steam Max 15 psi Max 250°F
Isopropyl Alcohol 200 psi Ambient
Latex Paint 200 psi 32˚F to 250˚F
Methyl Ethyl Ketone 200 psi Max 100˚F
Nitric Acid 10% 200 psi Ambient
Phosphoric Acid 25% 200 psi Ambient
Table 4: Fluids and water approved for use with MegaPress 316 systems
Type of Service Comments Pressure Temperature
Ethanol Pure Grain Alcohol 200 psi Ambient
Table 5: Fuel, oil, and lubricant approved for use with MegaPress 316 systems
Type of Service Comments Pressure Temperature
Compressed air Oil concentrate
< 25 mg/m3200 psi Max 140˚F
Oxygen - O2 (nonmedical) Keep oil and fat free
/ non-liquid O2
140 psi Max 140˚F
Nitrogen - N2200 psi Max 140˚F
Ammonia Anhydrous 200 psi Max 120˚F
Acetylene 20 psi Ambient
Argon Welding use 200 psi Max 140˚F
Hydrogen - H2125 psi Max 140˚F
Vacuum 29.2" of Hg 0° to 160˚F
Table 6: Gases approved for use with MegaPress 316 systems

Product Information
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IM-MP 591324 0120 MegaPress Stainless
Consult Viega’s Technical Services Department for information on applications
not listed or applications outside listed temperature and pressure ranges.
■ Viega Technical Services Department: T[email protected]
■ Design Service: For more information on 󶈵re protection system design,
radiant system design, and plumbing design services: [email protected]
2.3.3 Fire Protection Systems
MegaPress Stainless system components may be installed in NFPA 13,
13R, and 13D 󶈵re sprinkler systems. MegaPress 304 FKM and MegaPress
316 ½" to 2" 󶈵ttings are certi󶈵ed for use in “wet” and “dry” 󶈵re protection
systems in accordance with UL and FM certi󶈵cations:
■ UL/ANSI 213: Standard for Rubber Gasketed Fittings for Fire-
Protection Services.
■ ULC ORD-C213: Canadian Standard for Rubber Gasketed Fittings for
Fire-Protection Services.
■ FM Class 1920: Pipe Couplings and Fittings for Aboveground Fire
Protection Systems.
MegaPress Stainless 2½" to 4" 󶈵tting certi󶈵cation is coming soon.
Permitted pressure: 175psi
Nominal widths: ¾"-2"
Pipe wall thickness: Schedule 5 to Schedule 40
Area of use (pipeline network):
Wet sprinkler units:
■ Piping network downstream of the alarm valve station
Dry sprinkler units:
■ Piping network downstream of the alarm valve station
Fire󶈵ghting water additive: Generally not permitted; exceptions only with the
manufacturer's permission and prior agreement of Viega Technical Support.
2.3.4 Design Services

Product Information
12 of 45 IM-MP 591324 0120 MegaPress Stainless
The following standards and regulations apply to the United States and
Canada and are provided as a support feature.
Scope / Notice Regulations Applicable in U.S./Canada
No application for fuel gases Not allowed
Application in 󶈵re extinguishing systems NFPA 13, 13D, and 13R
Heating water for pump hot water
heating systems
ICC LC1002
Table 7: Applications Regulations
2.4 Standards and Regulations
2.4.1 Overview
2.4.2 Regulations: Applications
Standard De󶈵nition
ASTM A312 Standard speci󶈵cations for steel, black and hot dipped, zinc-
coated, welded, or seamless pipe
ASTM A554 Standard speci󶈵cation for welded stainless steel mechanical
tubing
ASTM A778 Standard speci󶈵cation for welded, unannealed austenitic
stainless steel tubular products
ASME B36.10 Welded and seamless wrought steel pipe
Table 8: Pipes Standards
2.4.3 Standards: Pipes
Standard De󶈵nition
MSS SP 58 Pipe hangers and supports materials, design, and manufacturer
Table 10: Mounting Standards
Standard De󶈵nition
ASTM D2000
Classi󶈵cation system for rubber products in automotive applications
ASTM F1476 Performance of gasketed mechanical couplings for use in
piping applications
Table 9: Sealing Elements Standards
2.4.4 Standards: Sealing Elements
2.4.5 Standards: Pipe Hangers

Product Information
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IM-MP 591324 0120 MegaPress Stainless
2.4.6 Standards: Pressure Testing
Standard De󶈵nition
ASME B31 Pressure piping
IAPMO PS 117 Press and nail connections
ASTM F3226 Standard speci󶈵cation for metallic press-connect 󶈵ttings for
piping and tubing systems
IACS Requirements concerning pipes and pressure vessels
Table 11: Pressure Testing Standards
MegaPress 304 FKM 󶈵ttings have the following listings and certi󶈵cations:
■ ABS: American Bureau of Shipping Type Approval
■ ASME B31.1: Power Piping
■ ASME B31.3: Process Piping
■ ASME B31.9: Building Service Piping
■ BV: Bureau Veritas Type Approval
■ Canadian Registration Number (CRN): 0A14541.5 A/B/C
■ DNV GL: Det Norske Veritas Germanischer Lloyd Type Approval
■ LR: Lloyd’s Register Type Approval
■ NKK: Nippon Kaija Kyokai Type Approval
■ FM Class 1920: Pipe Couplings and Fittings for Aboveground Fire
Protection Systems (½" to 2" 󶈵ttings only)
■ IAPMO PS-117: Press and Nail Connections
■ ICC-ES LC1002: Press-Connection Fittings for Potable Water Tube
and Radian Heating Systems
■ NFPA 13: Standard for the Installation of Sprinkler Systems
■ NFPA 13D: Standard for the Installation of Sprinkler Systems in One-
and Two-Family Dwellings and Manufactured Homes
■ NFPA 13R: Standard for the Installation of Sprinkler Systems in Low-
Rise Residential Occupancies
■ UL/ANSI 213: Standard for Rubber Gasketed Fittings for Fire-
Protection Service (½" to 2" 󶈵ttings only)
■ ULC/ANSI ORD-C213: Canadian Standard for Rubber Gasketed
Fittings for Fire-Protection Service (½" to 2" 󶈵ttings only)
2.5 Listings and Certi󶈵cations
2.5.1 MegaPress 304 FKM
MegaPress 316 󶈵ttings have the following listings and certi󶈵cations:
■ ABS: American Bureau of Shipping Type Approval
■ ASME B31.1: Power Piping
■ ASME B31.3: Process Piping
■ ASME B31.9: Building Service Piping
■ BV: Bureau Veritas Type Approval
■ Canadian Registration Number (CRN): 0A14541.5 A/B/C
■ DNV GL: Det Norske Veritas Germanischer Lloyd Type Approval
■ LR: Lloyd’s Register Type Approval
2.5.2 MegaPress 316

Product Information
14 of 45 IM-MP 591324 0120 MegaPress Stainless
MegaPress 316 FKM 󶈵ttings have the following listings and certi󶈵cations:
■ ABS: American Bureau of Shipping Type Approval
■ ASME B31.1: Power Piping
■ ASME B31.3: Process Piping
■ ASME B31.9: Building Service Piping
■ Canadian Registration Number (CRN): 0A14541.5 A/B/C
■ IAPMO PS-117: Press and Nail Connections
■ ICC-ES LC1002: Press-Connection Fittings for Potable Water Tube
and Radian Heating Systems
2.5.3 MegaPress 316 FKM
■ NKK: Nippon Kaija Kyokai Type Approval
■ FM Class 1920: Pipe Couplings and Fittings for Aboveground Fire
Protection Systems (½" to 2" 󶈵ttings only)
■ IAPMO PS-117: Press and Nail Connections
■ ICC-ES LC1002: Press-Connection Fittings for Potable Water Tube
and Radian Heating Systems
■ NFPA 13: Standard for the Installation of Sprinkler Systems
■ NFPA 13D: Standard for the Installation of Sprinkler Systems in One-
and Two-Family Dwellings and Manufactured Homes
■ NFPA 13R: Standard for the Installation of Sprinkler Systems in Low-
Rise Residential Occupancies
■ UL/ANSI 213: Standard for Rubber Gasketed Fittings for Fire-
Protection Service (½" to 2" 󶈵ttings only)
■ ULC/ANSI ORD-C213: Canadian Standard for Rubber Gasketed
Fittings for Fire-Protection Service NSF/ANSI 372: Drinking Water
System Components – Lead Content (½" to 2" 󶈵ttings only)
■ NSF/ANSI 61: Drinking Water System Components – Health E󶈴ects
■ NSF/ANSI 372: Drinking Water System Components – Lead Content

Product Information
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IM-MP 591324 0120 MegaPress Stainless
It is the responsibility of the installer or any other parties
to adhere to all applicable local rules and regulations
governing the nature of the installation.
MegaPress 304 FKM 󶈵ttings comply with the following codes and standards:
■ ASME B31: Code for Pressure Piping
■ IAPMO Uniform Mechanical Code (UMC)
■ ICC International Mechanical Code (IMC)
■ ICC International Residential Code (IRC)
■ National Building Code of Canada (NBCC)
■ National Plumbing Code of Canada (NPCC)
■ ASTM A312: Standard Speci󶈵cation for Seamless, Welded and Heavily
Cold Worked Austenitic Stainless Steel Pipes
■ ASTM A554: Standard Speci󶈵cation for Welded Stainless Steel
Mechanical Tubing
2.6 Codes and Standards
2.6.1 MegaPress 304 FKM
MegaPress 316 󶈵ttings comply with the following codes and standards:
■ ASME B31: Code for Pressure Piping
■ IAPMO Uniform Mechanical Code (UMC)
■ ICC International Mechanical Code (IMC)
■ ICC International Residential Code (IRC)
■ National Building Code of Canada (NBCC)
■ National Plumbing Code of Canada (NPCC)
■ ASTM A312: Standard Speci󶈵cation for Seamless, Welded and Heavily
Cold Worked Austenitic Stainless Steel Pipes
■ ASTM A554: Standard Speci󶈵cation for Welded Stainless Steel
Mechanical Tubing
■ IAPMO California Plumbing Code (CPC)
■ IAPMO National Standard Plumbing Code (NSPC)
■ IAPMO Uniform Plumbing Code (UPC)
■ ICC International Plumbing Code (IPC)
2.5.4 MegaPress 316
MegaPress 316 FKM 󶈵ttings comply with the following codes and standards:
■ ASME B31: Code for Pressure Piping
■ IAPMO Uniform Mechanical Code (UMC)
■ ICC International Mechanical Code (IMC)
■ ICC International Residential Code (IRC)
■ National Building Code of Canada (NBCC)
■ National Plumbing Code of Canada (NPCC)
■ ASTM A312: Standard Speci󶈵cation for Seamless, Welded and Heavily
Cold Worked Austenitic Stainless Steel Pipes
■ ASTM A554: Standard Speci󶈵cation for Welded Stainless Steel Mechanical Tubing
2.6.2 MegaPress 316 FKM

Product Information
16 of 45 IM-MP 591324 0120 MegaPress Stainless
The MegaPress Stainless system consists of press connectors for
stainless steel pipes and the corresponding press tools. MegaPress
press jaws, actuator, and rings are available for various dimensions. Their
constant compression produces a positive, nondetachable, mechanical
joint. The system components are available in the following dimensions:
½", ¾", 1", 1¼", 1½", 2", 2½", 3", 4".
Viega MegaPress Stainless ½" to 4" 󶈵ttings are compatible with ASTM A312
stainless steel pipe, schedule 5 to schedule 40 for ½" to 2" 󶈵ttings and schedule
10 to schedule 40 stainless steel pipe for 2½" to 4" 󶈵ttings. Fittings are for use
with both annealed and unannealed pipe.
If the pipe has been coated, the maximum external
diameter listed in the tables on the next page must not be
exceeded.
2.7 Product Description
2.7.1 Overview
2.7.2 Pipes
2.6.2.1 Schedule 5 Pipe
Pipe Size
(inches)
Outside
diameter
(inches)
Outside
diameter
(mm)
Wall thickness
(inches)
Wall thickness
(mm)
½ 0.84 21.3 0.065 1.65
¾ 1.05 26.7 0.065 1.65
1 1.32 33.4 0.065 1.65
1¼ 1.66 42.2 0.065 1.65
1½ 1.9 48.3 0.065 1.65
2 2.375 60.3 0.083 2.11
2½ 2.875 73.0 0.083 2.11
3 3.5 88.9 0.083 2.11
4 4.5 114.3 0.083 2.11
Table 12: Schedule 5 Pipe Sizing

Product Information
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IM-MP 591324 0120 MegaPress Stainless
2.7.2.1 Schedule 10 Pipe
2.7.2.2 Schedule 40 Pipe
Pipe Size
(inches)
Outside
diameter
(inches)
Outside
diameter
(mm)
Wall thickness
(inches)
Wall thickness
(mm)
½ 0.84 21.3 0.083 2.11
¾ 1.05 26.7 0.083 2.11
1 1.32 33.4 0.109 2.77
1¼ 1.66 42.2 0.109 2.77
1½ 1.9 48.3 0.109 2.77
2 2.375 60.3 0.109 2.77
2½ 2.875 73.0 0.12 3.05
3 3.5 88.9 0.12 3.05
4 4.5 114.3 0.12 3.05
Table 13: Schedule 10 Pipe Sizing
Pipe Size
(inches)
Outside
diameter
(inches)
Outside
diameter
(mm)
Wall thickness
(inches)
Wall thickness
(mm)
½ 0.84 21.3 0.109 2.77
¾ 1.05 26.7 0.113 2.87
1 1.32 33.4 0.133 3.38
1¼ 1.66 42.2 0.14 3.56
1½ 1.9 48.3 0.145 3.68
2 2.375 60.3 0.154 3.91
2½ 2.875 73.0 0.203 5.16
3 3.5 88.9 0.216 5.49
4 4.5 114.3 0.237 6.02
Table 14: Schedule 40 Pipe Sizing

Product Information
18 of 45 IM-MP 591324 0120 MegaPress Stainless
2.7.3 Viega MegaPress Stainless Pipe Marking Guide
Usage Material Properties Type of Application
(typical)
Color
Scheme
Hazardous
Materials
■ Flammable or Explosive
■ Chemically Active or
Toxic
■ Radioactive
■ Extreme Temperature /
Pressure
■ Process Piping
■ High-Pressure
Steam
■ Acids/Corrosives
YELLOW ON
BLACK
Low Hazard
Materials
(Liquid)
■ Liquid
■ Liquid Admixture
■ Cooling Water
■ Grey Water
■ Chilled Water
WHITE ON
GREEN
Low Hazard
Materials (Gas)
■ Gas
■ Gas Admixture
■ Compression Air
■ Nitrogen (N2)
■ Argon (Ar)
WHITE ON
BLUE
Fire
Suppression
■ Liquid
■ Gas
■ Foam
■ Sprinklers (Wet/Dry)
■ CO2
■ Foam (AFFF)
WHITE ON
RED
Table 15: Guide to the ASNI A13.1 standard for the identi󶈵cation of pipes
Pipe O.D. Including Covering Minimum Length of
Label Field Color
Minimum Height of Letters
¾" to 1¼" 19 mm to 32 mm 8" 203 mm ½" 13 mm
1½" to 2" 38 mm to 51 mm 8" 203 mm ¾" 19 mm
2½" to 4" 64 mm to 108 mm 12" 305 mm 1¼" 32 mm
Table 16: Pipe markers
Marker Placement
■ At all changes in direction
■ At both sides of any penetrations (valves, 󶈶anges, tees, etc.)
■ At frequent intervals on straight run (50 feet is typical)
■ Locate pipe markers so they are readily visible
■ Provide arrows indicating direction of 󶈶ow
Note: This guide is for general information purposes only. Pipe markings
shall be in accordance with local code requirements.
All Viega MegaPress Stainless piping systems should be continuously marked in
accordance with ANSI A13.1 or as required by the local authority having jurisdiction.

Product Information
19 of 45
IM-MP 591324 0120 MegaPress Stainless
1 Each 󶈵tting contains an application speci󶈵c sealing element.
2 The 304 stainless steel separator ring ensures that the sealing element
and grip ring perform at maximum capacity by providing a positive
physical separation.
3 The grip ring is a 420 stainless steel ring with bidirectional teeth that grip
the pipe and ensure that the 󶈵tting is locked securely to the piping.
1 The 420 stainless steel grip ring's teeth cut into the pipe and lock the
󶈵tting securely in place.
2 A PBT (Polybutylene Terephthalate) separator ring protects the sealing
element from damage by creating a positive physical separation during
installation and later during pressing.
3 The sealing element ensures water-tight or air-tight connections.
MegaPress Stainless 2½" to 4" 󶈵ttings are designed to be pressed with
MegaPress XL press rings and Z3 actuator to produce a non-detachable,
secure connection.
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Press 󶈵ttings are available in a number of con󶈵gurations and sizes. An
overview of the press 󶈵ttings suitable for a system can be found in the catalog.
2.7.4 Press Fittings
Viega MegaPress 304 FKM and 316 FKM 󶈵ttings are manufactured with
a high-quality, dull black FKM (Fluoroelastomer) sealing element installed
at the factory. The molded sealing lips also seal pipe surfaces with slightly
uneven surfaces. Sealing elements are inserted into the 󶈵tting using a H1
food grade lubricant registered with NSF and the USDA, and is approved
for use under FDA 21 CFR.
FKM possesses excellent resistance to aging, ozone, sunlight,
weathering, environmental in󶈶uences, and oils and petroleum-based
additives. Its superb resistance to high temperatures and petroleum
based additives makes it ideal for seals and gaskets in solar, district
heating, low-pressure steam, and compressed air system 󶈵ttings.
The operating temperature of the FKM sealing element is 14° to 284°F
(-10° to 140°C). It can withstand heat spikes up to 356°F.
2.7.4.1 Viega MegaPress Stainless ½" to 2" Fittings
2.7.4.2 Viega MegaPress Stainless 2½" to 4" Fittings
2.7.4.3 FKM Sealing Element

Product Information
20 of 45 IM-MP 591324 0120 MegaPress Stainless
Viega MegaPress 316 󶈵ttings are manufactured with a high-quality, shiny
black EPDM (Ethylene Propylene Diene Monomer) sealing element installed
at the factory. The molded sealing lips also seal pipe surfaces with slightly
uneven surfaces. Sealing elements are inserted into the 󶈵tting using a H1
food grade lubricant registered with NSF and the USDA, and is approved for
use under FDA 21 CFR.
The EPDM sealing element possesses excellent resistance to aging,
ozone, sunlight, weathering, environmental in󶈶uences, and most alkaline
solutions and chemicals used in a broad range of applications.
The operating temperature of the EPDM sealing element is 0° to 250°F
(-18° to 120°C).
2.7.4.4 EPDM Sealing Element
Each MegaPress 304 FKM 󶈵tting is marked with the following:
■ White dot: FKM sealing element and Smart Connect technology
■ Size of 󶈵tting
■ Manufacturer name
■ Manufacturer date code
■ Country of origin
■ Batch code
■ UMC®
Each MegaPress 316 󶈵tting is marked with the following:
■ Green dot: EPDM sealing element and Smart Connect technology
■ Size of 󶈵tting
■ Manufacturer name
■ Manufacturer date code
■ Country of origin
■ Batch code
■ NSF®-61-372
■ UPC®
2.7.4.5 Fitting Markings
Each MegaPress 316 FKM 󶈵tting is marked with the following:
■ White dot: FKM sealing element and Smart Connect technology
■ Size of 󶈵tting
■ Manufacturer name
■ Manufacturer date code
■ Country of origin
■ Batch code
■ UMC®
316