The document provides guidelines for testing valves in accordance with ASME B16.34 and MSS-SP-99 standards. It outlines procedures for shell testing, seat testing, hydrostatic testing, and pneumatic testing of valves. The tests involve applying water, gas, or air at minimum pressures of 1.5 times or 1.1 times the valve rating and checking for visible leaks over a minimum duration of 15 seconds at temperatures between 50-125°F. Acceptance criteria include no visible leakage, with closure leakage determined by agreement between manufacturer and purchaser.

1. Valve Testing Guidelines
in accordance with
ASME B16.34 & MSS-SP-99
Prepared By: Nilesh Mistry E-Mail: mistrynilesh@icloud.com

2. Shell Test
Seat Test
(Closure Test)
Shell Test
Seat Test
(Closure Test)
Shell Test
Seat Test
(Closure Test)
Shell Test
Seat Test
(Closure Test)
Test Fluid Water Water
Air, Nitrogen or other Gas of
Similar or Lower Viscosity
Air, Nitrogen or other Gas of
Similar or Lower Viscosity
Water Water Gas for NPS ≤ 4 - Class ≤ 2500
Test Pressure
Minimum 1.5 times the CWP
Rating of Valve
1.1 Times the CWP Rating of
Valve
Minimum 80 psi Minimum 80 psi
Min 1.5 Times the 38°C
(100°F) Pressure Rating of
Valve (Gage Pressure)
Minimum 110% of the 38°C
(100°F) Pressure Rating of
Valve (Gage Pressure)
Minimum 5.5 bar (80 psi)
(Gage Pressure)
Test Duration Minimum 15 Seconds Minimum 15 Seconds Minimum 15 Seconds Minimum 15 Seconds
Minimum 15 Seconds for
Valve Sizes NPS ≤ 2
(After the valve is prepared
and is under Shell Pressure)
Minimum 15 Seconds for
Valve Sizes NPS ≤ 2
(After the valve is prepared
and is under Full Pressure)
Minimum 15 Seconds for Valve
Sizes NPS ≤ 2
(After the valve is prepared and is
under Full Pressure)
Temperature of Test Fluid 50°F to 125°F 50°F to 125°F - - Maximum 50°C (125°F) Maximum 50°C (125°F) Maximum 50°C (125°F)
Test Condition - - - -
Test shall be made with Valve
in Partially Open Condition.
-
The Closure Tightness
Requirements vary with Intended
Service Application.
Acceptance No Visible Leakage No Visible Leakage
No Visible Leakage when
Immersed in Water or Coated
with Leak Detection Solution
No Visible Leakage when
Immersed in Water or Coated
with Leak Detection Solution
No Visually Detactable
Leakage
Closure Test Leakage
Acceptance Criteria shall be
by Agreement between
Manufacturer and Purchaser.
Closure Test Leakage Acceptance
Criteria shall be by Agreement
between Manufacturer and
Purchaser.
Valve Testing Guidelines
Hydrostatic Testing Hydrostatic Testing Pnuematic Testing
-
Pnuematic Testing
MSS-SP-99 ASME B16.34
Description
E-Mail: mistrynilesh@icloud.comPrepared By: Nilesh Mistry

3. Shell Test
Seat Test
(Closure Test)
Shell Test
Seat Test
(Closure Test)
Test Fluid Water Water
Air, Nitrogen or other Gas of
Similar or Lower Viscosity
Air, Nitrogen or other Gas of
Similar or Lower Viscosity
Test Pressure
Minimum 1.5 times the CWP
Rating of Valve
1.1 Times the CWP Rating of
Valve
Minimum 80 psi Minimum 80 psi
Test Duration Minimum 15 Seconds Minimum 15 Seconds Minimum 15 Seconds Minimum 15 Seconds
Temperature of Test Fluid 50°F to 125°F 50°F to 125°F - -
Test Condition - - - -
Acceptance No Visible Leakage No Visible Leakage
No Visible Leakage when
Immersed in Water or Coated
with Leak Detection Solution
No Visible Leakage when
Immersed in Water or Coated
with Leak Detection Solution
Valve Testing Guidelines - MSS-SP-99
Description
MSS-SP-99
Hydrostatic Testing Pnuematic Testing
E-Mail: mistrynilesh@icloud.comPrepared By: Nilesh Mistry

4. Shell Test
Seat Test
(Closure Test)
Shell Test
Seat Test
(Closure Test)
Test Fluid Water Water Gas for NPS ≤ 4 - Class ≤ 2500
Test Pressure
Min 1.5 Times the 38°C (100°F)
Pressure Rating of Valve (Gage
Pressure)
Minimum 110% of the 38°C (100°F)
Pressure Rating of Valve (Gage
Pressure)
Minimum 5.5 bar (80 psi)
(Gage Pressure)
Test Duration
Minimum 15 Seconds for Valve
Sizes NPS ≤ 2
(After the valve is prepared and is
under Shell Pressure)
Minimum 15 Seconds for Valve
Sizes NPS ≤ 2
(After the valve is prepared and is
under Full Pressure)
Minimum 15 Seconds for Valve
Sizes NPS ≤ 2
(After the valve is prepared and is
under Full Pressure)
Temperature of Test Fluid Maximum 50°C (125°F) Maximum 50°C (125°F) Maximum 50°C (125°F)
Test Condition
Test shall be made with Valve in
Partially Open Condition.
-
The Closure Tightness
Requirements vary with Intended
Service Application.
Acceptance No Visually Detactable Leakage
Closure Test Leakage Acceptance
Criteria shall be by Agreement
between Manufacturer and
Purchaser.
Closure Test Leakage Acceptance
Criteria shall be by Agreement
between Manufacturer and
Purchaser.
-
Valve Testing Guidelines - ASME B16.34
Description
ASME B16.34
Hydrostatic Testing Pnuematic Testing
E-Mail: mistrynilesh@icloud.comPrepared By: Nilesh Mistry