FlexconVerified
Flexcon PH5 Spec Sheet
Single Diaphragm Expansion Tank
Product Overview
Streamline your project's submittal process by downloading the comprehensive spec sheet and shop drawings for the Flexcon PH 5-C ASME Thermal Expansion Tank. Engineered with a heavy-duty butyl interior bladder (FDA/CSA/NSF61 approved) and a robust carbon steel shell with red oxide primer, this pre-charged tank is designed to efficiently absorb expansion forces and control pressure in domestic water heating systems. Fully compliant with ASME Boiler and Pressure Vessel Code Section VIII and NSF/ANSI Standard 61, it offers dependable, long-lasting performance for critical water heating applications.
Key Features
- ASME fixed diaphragm design for efficient thermal expansion absorption
- Heavy-duty butyl interior bladder (FDA/CSA/NSF61 approved) prevents corrosion and water-logging
- Specifically designed for domestic water heating systems to control pressure
- Robust carbon steel shell and heads with red oxide primer for durability
- Factory pre-charged at 40 psi (276 kpa), with a standard tire valve for field adjustment
Technical Specs
TypeASME Fixed Diaphragm Thermal Expansion Tank
ModelPH 5-C
Height14 inches (356 mm)
Weight22 lbs (10 kgs)
Diameter10 inches (254 mm)
Tank Volume3.5 Gallons (13.3 Liters)
ManufacturerFlexcon
Head MaterialCarbon Steel
CertificationsASME Boiler and Pressure Vessel Code Section VIII, NSF/ANSI Standard 61, FDA/CSA Approved (bladder)
Shell MaterialCarbon Steel
Exterior FinishRed Oxide Primer
Acceptance Volume2.3 Gallons (8.7 Liters)
Interior MaterialHeavy-duty Butyl Bladder (FDA/CSA/NSF61 Approved)
System Connection¾ inch NPT (19 mm)
Temperature Range-20ºF to 240ºF (-29ºC to 115.6ºC)
Maximum Design Pressure150 PSIG (1034 kpa)
Charging Valve Connection.302”-32NC (Standard Tire Valve)
Factory Pre-charge Pressure40 PSIG (276 kpa)
About This Spec
Last Verified
May 13, 2026
Status
Verified (1x confirmed)