Rhydymwyn Valley History Society
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Rhydymwyn Valley History Society
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Rhydymwyn Valley History Society
Glossary
Vesicant
A blistering agent used in chemical warfare
F.F.D.s
Forward Filling Depots. Units where mustard gas was shipped for charging chemical munitions.
C.I.D.
Chemical Inspection Department
D.I.P.
Department of Industrial Planning
M.S.
Mild Steel
Runcol, HT
Types of Mustard Gas
Pyro, HT, HBD & Pyro M
Types of…
APPENDIX 4
INVENTORY
Underground Storage Area.
The storage area was excavated in a limestone hill, with four chambers at an average depth of 147ft below ground. Their dimensions were:-
(a) 4 chambers 260ft x 30ft x 20ft 6inches high
(b) 1 chamber 272ft x 30ft x 20ft 6inches…
APPENDIX 3
General History of the Storage Tunnels
On December 11th 1940 the first load of Pyro M ex-Randle for underground storage was delivered to Valley Works and discharged into US tank No 1. The transfer was carried out without mishap but owing to the low temperatures prevailing, braziers had to…
APPENDIX 2
Ventilation Plant House (Type S)
General Requirements
Since it was necessary to deal with a potentially toxic atmosphere, adequate ventilation and certain temperature and hygrometric conditions had to be maintained inside the tunnels. The following rates of air change were provided for:-
Bulk Storage and Bonding…
APPENDIX 1
Routine Work Carried Out In The Tunnels
Tunnel Sumps- These were drained once per shift and more often if necessary. The sample of any tank was taken immediately before starting to draw material from it. In the early days of 1941 chlorine gas was passed into the sumps…
The external heating system consisted of two powerful fans in parallel, running one at a time, which sucked air through a steam heater, a water spray, a series of baffle plates and then another steam heater. Air then passed through a fan, which blew it into the centre tunnel. The…
An air conditioning plant was built just outside the main tunnel and completed in March 1942. Its purpose was to provide a means of regulating the temperature and condensation in the storage areas. As originally planned the ventilating air was to be admitted up the centre tunnel in the arch…
The ventilation was by two powerful extractor fans, one situated at the end of each wind tunnel. When the doors to the tunnels were closed and the fans were turned on, air was drawn through the air vents above the doors of the central tunnel and along the passage between…
