Algas SDI VAPORAIRE M-Series, Operation & Maintenance Manual

Page: 26 / 72

Installation
2-18
Algas-SDI Operations & Maintenance Manual – P/N - 54264
SURGE/ACCUMULATOR TANK SIZING

Provide a correctly sized
MIXED GAS SURGE/ACCUMULATOR TANK
,
suitable for the
intended service and pressure. The tank must have a relief valve, drain, pressure
gauge, mixed gas inlet and outlet, pressure sensing port and gas sampling port.
Refer to Table 4 below for surge/accumulator tank requirements. An oversized tank
is preferred because it improves heating value (CV) stabilization by reducing venturi
cycling rates.
Table 4 - Surge/Accumulator Tank Requirements
MODELS
1
DELIVERY PRESSURE
2
5 PSI 8 PSI 10 PSI 12 PSI 15* PSI
28
240 U.S. GALLONS
500
U.S.
GALLONS
35
39
42
52
56
65
70
75
84
88
100
500 U.S. GALLONS 125
150
*All 15 PSI models require a surge/accumulator tank of at least 500 gallons capacity.
1
Capacity is based on a nominal mixed gas gross heating value of 1450 BTU/SCF with commercial
grade propane. Actual capacity and mixed gas heating value may vary slightly based on installation
and operating conditions.
2
Delivery pressures shown are valid up to 2,000 feet elevation. Contact the factory for
information regarding applications at higher elevations.

Connect the
MIXED GAS OUTLET
of the unit to
SURGE/ACCUMULATOR OPENING
or
tee the surge/accumulator into the
MIXED GAS OUTLET SPOOL
. It is not necessary
for the flow to pass through the surge/accumulator since its purpose is to act as a
volume buffer. The interconnecting spool should be the
SAME DIAMETER AS THE
MIXED GAS OUTLET
AND NO LONGER THAN
TEN FEET
. A shutoff valve should be
installed connected into the
MIXED GAS OUTLET SPOOL.