100 



The Weekly Florists' Review. 



Apbil 18, 1912. 



Greenhonse Heating. 



WATER IN THE BOILES PIT. 



Will you be kind enough to help us 

 out of our trouble, which is water in 

 the boiler pit? The question of drain- 

 age has been considered, but there is 

 too great a distance to go to obtain a 

 fall, so we must raise the boiler to the 

 greenhouse level. The side walls are 

 three and one-half feet high, the purlin 

 columns five feet high and the ridge 

 nine feet high. The boiler outlet is 

 six feet from the base; the boiler inlet 

 is one and one-half feet from the base. 

 We have a hot water heating system, 

 with an enclosed tank. The pipe in use 

 is 2-inch for the risers and l^^-inch for 

 the returns. g" F. B. 



While it is always desirable so to 

 locate the heater that it will be below 

 the level of the coils, it will give a 

 good circulation even though it stands 

 on the same level as the greenhouse 

 floor. Had the length and breadth of 

 the greenhouse been given, it would not 

 be diflScult to give directions for pip- 

 ing the house, but as no data along this 

 line have been furnished, it is not pos- 

 sible to give any really definite advice. 

 All that can be done is to run two or 

 three mains at as high a level as pos- 

 sible and connect them at the farther 

 end of the house with the return pipes. 



ON THE PACIFIC COAST. 



I am sending you a sketch of my 

 greenhouses, each 22x135 feet and 

 twelve feet to the ridge. They will 

 run east and west. I should like to 

 know how many square feet of radi- 

 ation will be required to maintain tem- 

 peratures of 60 and 50 degrees, when 

 the outside temperature is 12 degrees. 

 I will use hot water and will have the 

 piping under the benches. H. N. 



The sketch shows two houses, each 

 22x135 feet, with one wall in common 

 and with the north wall of one house 

 of solid boards, five feet high, and 

 the south wall of the other house of the 

 same height, but with the upper half of 

 glass. A boiler with a rating of 2,400 

 square feet of radiating surface should 

 be used. For each house use three 2M:- 

 inch flow pipes, placing one on the cen- 

 ter posts, about two feet below the 

 ridge, and the others on the plates. In 

 the south house, to be heated to 60 

 degrees, use nine 2-inch returns. Use 

 six 2-inch returns in the north house. 

 Place one-third of the returns under 

 benches and the others on the walls 

 or under the side benches. F. E. 



PRESSUBE SYSTEMS. 



We are writing in regard to the 

 open and closed systems of hot water 

 heating. As we understand it, the open 

 system is connected, at the highest 

 point of the flows, with an open expan- 

 sion tank. In the closed system the 

 expansion tank must be tight, with the 

 addition of a safety valve. There is a 

 safety valve on our tank at present. 

 What pressure would the tank carry? 



E. & K. 



The amount of pressure that should 

 be carried in a closed hot water system 



IMICO 



Hot Water Boilers 



Made by 



lUINOIS MALLEABLE IRON GO. 



1801-1825 DivcfMy Bonlevinl 



CHICAGO 



Are noted for coal eooaom j and 

 i^od reaolts g^nerallj 



■■HD rOR CATAL06DB 



IMPROVED RETURN TUBULAR 

 FIREBOX BOILER 



Johnston Heating Co. 



131 B. 26th St., New York City 



Mention Tbe Review wben you write 



WILKS 



Hot Wator^Bollers 



The Moat Keonomlcal BoUera 

 for Greenbouaea tt ti 



No night fireman required with our 

 Self-feeding Hot Water Boilers. 



iMd hr CatalHM aat PrIcM. 



8. WILK8 MFG. CO. 



SSM Bblelda Ato.. CHXCAGO 

 V - 



Mention Tbe Review wben you write. 

 DO TOU KMOW ABOUT THK 



Nartin Rocking Grate 



IT SAVES COAL 



MARTIN CRATE CO.,"*' ^il'lSr ''' 



Mention The Review when you write. 



SMITH, LINEAWEAVER& CO. 



CO A L 



Aatkraeite, Bitamlnoai, Coke u4 Oaa Ooal 



tr^iT^ul^,, Philadelphia 



Mention Tbe Review wben you write. 



Greenhouse 

 Heating: Systems 



and 



*» 



m 



RETURN TRAPS 



work well together 



It costs no more to have 

 free and clear steam lines 

 and an efficient heating sys- 

 tem than to have sluggish 

 lines and an inefficient heat- 

 ing system. 



It's useless to expect good 

 results when trying to put 

 steam through coils that are 

 half full of condensation. 



"Detroit" Return Traps 

 not only keep lines clear of 

 water but automatically re- 

 turn it directly to the boiler 

 at practically the same 

 temperature at which it is 

 condensed. 



Once installed, "Detroit" 

 Return Traps are always 

 on the job. 



steam Trap Bulletin No. 326-WF just 

 ofT the press. Yours for the asking. 



Detroit, Michigan 

 U. S. A. 



